Browse by Lectorate "Duurzame Energie"

Now showing items 1-45 of 45

Utilization of geometric light trapping in thin film silicon solar cells: simulations and experiments, Progress in Photovoltaics: : Research and Applications
Rijn, C.J.M. van ; Rath, J.K. ; Schropp, R.E.I. ; Sonneveld, P.J. ; Baggerman, J. ; Jong, Reinhard de
2012, Article / Letter to editor (Progress in Photovoltaics: Research and Applications, (2012))In this study, we present a new light absorption enhancement method for p-i-n thin film silicon solar cells using pyramidal surface structures, larger than the wavelength of visible light. Calculations show a maximum possible current enhancement of 45% compared with cells on a flat substrate. We deposited amorphous silicon (a-Si) thin film solar cells directly onto periodically pyramidal-structured polycarbonate (PC) substrates, which show a significant increase (30%) in short-circuit current over reference cells deposited on flat glass substrates. The current of the cells on our pyramidal structures on PC is only slightly lower than that of cells on Asahi U-type TCO glass (Asahi Glass Co., Tokyo, Japan), but suffer from a somewhat lower open circuit voltage and fill factor. Because the used substrates have a locally flat surface area due to the fabrication process, we believe that the current enhancement in the cells on structured PC can be increased using larger or more closely spaced pyramids, which can have a smaller flat surface area.
Up scaling and test results of an advanced Fresnel greenhouse
Tuijl, E.A. van ; Janssen, H.J.J. ; Zwart, H.F. de ; Sonneveld, P.J. ; Swinkels, Gert-Jan
2012, Article / Letter to editor (Acta Horticulturae, iss. 952, (2012), pp. 531)A greenhouse with Fresnel lenses in the south facing roof and a receiver for concentrated Photovoltaics with water cooling (CPVT system) will result in electrical and thermal energy output from the solar energy excess entering a greenhouse. The PV system converts about half of the direct radiation into heat and electricity. During periods with direct radiation this will significantly reduce the heat load on the greenhouse. For an optimal performance the roof elements must be asymmetric with a steep inclination at the north side (the exact angle of course depends on the latitude of the building site). The Fresnel lens structure is best oriented in upwards direction. In the current design, two lenses are placed in the inner space of a double glass. This prevents pollution and condensation on the lenses. By the upward facing of the lens structure, the focus quality is preserved over a much broader range of angles of incidence compared to a lens with downward facing structures. Each PMMA lens with a size of 1.20×1.52 m is composed of 12 ‘tiles’ for easy production. The focal distance of the lens is 1,875 m and the geometrical concentration factor is 50×. This means that in most cases the focus line is thinner than 3 cm. The performance of the lens with respect to the shape of the focal area and the position of the focal line has been analyzed with ray tracing techniques. From this analyses and by the development of a smart tracking system only two motors can bring the receivers in the required positions. One motor controls the distance between lens and receiver and the other controls the translocation of the receivers parallel to the lens. The second conclusion was that the positions of the focal line are within the bounds of the greenhouse construction for almost the whole year. Only in winter, in the early morning and at the end of the day, the focal line will be unreachable. The 480 m2 greenhouse, with the LCPVT system based on Static Fresnel lenses and a 40 m CPVT-module and a 200 m CT-module, is designed by Bode Project Engineering and constructed by Technokas in Bleiswijk the Netherlands.
Tijd voor duurzame energie : Intreerede lector Piet Sonneveld
Sonneveld, P.J.
2012, Inaugural lecture Er is veel maatschappelijke aandacht voor duurzame energie. Vooral omdat duurzame energie een belangrijke bijdrage kan leveren aan de oplossing van de klimaatproblematiek. Er zijn diverse indicatoren die aangeven dat klimaatverandering optreedt. De drie belangrijkste indicatoren voor klimaatverandering zijn de CO2-concentratie in de atmosfeer, de gemiddelde temperatuur op aarde en het ijsoppervlak op aarde.
Technisch weekblad over windminor, HAN communicatie voor master module sustainable energy systems
Catau, R.G.
2018, Contribution for newspaper or weekly magazine (Technisch weekblad over windminor, HAN communicatie voor master module sustainable energy systems, )
Spelen met gelijke middelen: overstijgende narratieven als instrument voor sociale transformatie
Jansen, R.M.C.
2013, Article / Letter to editor (Journal of Social Intervention : Theory and Practice, vol. 22, iss. 4, (2013), pp. 43-60)Recente ontwikkelingen in wonen, welzijn en zorg vereisen een transformatie van de sociale sector in Nederland. Een narratieve benadering wordt voorgesteld als een potentieel krachtig middel om deze transformatie vorm te geven vanuit collectieve betekenisverlening in de zorg- en welzijnsnetwerken. Er wordt een metafoor gehanteerd van het leren spelen van een nieuw spel, met als belangrijkste elementen relaties, betekenis en participatie. Dynamiek in het spel wordt van bovenaf gegenereerd door narratieve interventies en van onderop door het aanspreken van leervermogen en collectieve leerprocessen van de spelers. Narrativiteit vormt op deze wijze een integraal, democratisch en netwerk-gebaseerd alternatief voor traditionele sturingsmechanismen te midden van en na de transformatie van de sociale sector.
Serviceflats: een eigentijdse huisvestingsvorm (of hoe ze dat zouden kunnen worden...).
Middelkoop, R.J.M. ; Sloof, J. ; Jansen, R.M.C. ; Vroon, Tom
2012, Article / Letter to editor (SeniorVAK, vol. 2012, iss. 2, (2012), pp. 22-25)Nederland beschikt over 350 serviceflats, met opgeteld circa 40.000 appartementen5). Ooit vormden ze een breed gewaardeerd alternatief voor wonen in een verzorgingshuis. Op dit ogenblik worden nogal wat complexen met leegstand geconfronteerd. Dat is opmerkelijk: enerzijds neemt het aantal ouderen als onderdeel van onze bevolking sterk toe en daarmee stijgt ook de behoefte aan aangepaste huisvesting. Anderzijds wordt het verzorgingshuis (al of niet terecht) maatschappelijk minder geapprecieerd en is het veel moeilijker geworden er een indicatie voor te krijgen. Dat toch van leegstand in serviceflats sprake is, duidt op een probleem. Naar onze mening kan de verklaring daarvoor in drie factoren gevonden worden. Gelukkig zijn ook oplossingen voorhanden.
Scaled Test Environment for Testing ITS Applications
Kusumakar, Rakshith ; Tomar, A.S. ; Pyman, B.J. ; Kural, K. ; Tillema, F.
2021, Article in monograph or in proceedings (26th ITS World Congress Singapore 2019, EU-TP1992)
A preliminary framework of digital assessment for an automated highway overtaking system
Tomar, A.S. ; Jagadeesh, A. ; Huijboom, C.N. ; Tillema, F.
2020, Article in monograph or in proceedings (Virtual ITS European Congress 2020, ITS-TP2269)
Predicting traffic phases from car sensor data using machine learning
Heyns, E.E. ; Uniyal, S. ; Dugundji, Elenna ; Tillema, F. ; Huijboom, C.N.
2019, Article in monograph or in proceedings (Shakshuki, Elhadi (ed.), The 10th International Conference on Ambient Systems, Networks and Technologies (ANT 2019))This research is an explorative study to look for the potential to predict traffic density from driver behaviour using signals collected from the Controller Area Network (CAN) bus. The hypothesis is that driver behaviour is influenced by traffic density in such a way that an approximation of the traffic density can be determined from changes in the driver behaviour. Machine learning will be employed to correlate a selection of commonly available sensors on cars to the traffic density. Challenges in the processing of the data for this purpose will be outlined. The data for this study is collected from five passenger cars and nineteen trucks driving on the A28 highway in Utrecht region in the Netherlands. This study is restricted to straight roads in order to isolate the steering behaviour attributable to the traffic state influences rather than following the curve in the road. The results are encouraging that the correlation between driver behaviour and traffic density can be established. An overall accuracy of over 95% is achieved with a precision of 92%. The recall rate however is low most likely caused by over-fitting due to the unbalanced data set. The results still look promising and more training data should improve the results. This research is part of the broader project VIA NOVA which aims to investigate the use of car-sensor data for traffic and road asset management.
Predicting traffic phases from car sensor data
Heyns, E.E. ; Uniyal, S. ; Huijboom, C.N.
2019, Article in monograph or in proceedings (Paper number ITS-1974, 13th ITS European Congress)This research is an explorative study to look for the potential to predict traffic density from driver behavior using signals collected from the Controller Area Network (CAN) bus. The hypothesis is that driver behavior is influenced by traffic density in such a way that an approximation of the traffic density can be determined from changes in the driver behavior. Machine learning will be employed to correlate a selection of commonly available sensors on cars to the traffic density. Challenges in the processing of the data for this purpose will be outlined. This study is restricted to straight roads in order to isolate the steering behavior attributable to the traffic state influences rather than following the curve in the road. The results are encouraging that the correlation between driver behavior and traffic density can be established. An overall accuracy of over 95% is achieved with a precision of 92%. The recall rate however is low most likely caused by over-fitting due to the unbalanced dataset.
Onderzoek in het hbo op de lerarenopleiding
Geerdink, G. ; Pool, E.M.C. van der ; Jansen, R.M.C.
2008, Article / Letter to editor (Thema: Tijdschrift voor Hoger Onderwijs en Management, vol. 15, iss. 1, (2008), pp. 56-61)Onderzoek in het hoger beroepsonderwijs krijgt zowel in de media als binnen de opleidingen zelf steeds meer aandacht. En hoewel we er eigenlijk niet meer omheen kunnen, zijn er op de opleidingen nog veel tegenstanders. De tegenzin lijkt vooral gevoed door de overtuiging dat onderzoek binnen het hbo niet haalbaar en nodig is, en door onduidelijkheid over het hoe dat onderzoek er dan uitziet. ‘Hogescholen moeten geen universiteit willen spelen’, zo wordt gezegd. Vooral dat laatste maakt duidelijk dat onderzoek binnen het hoger beroepsonderwijs nog geen opzichzelfstaand gegeven is, nog geen eigen identiteit heeft. Aan het identificeren van het onderzoek in het hoger beroepsonderwijs willen we een bijdrage leveren. Niet om het af te bakenen of een bepaalde richting uit te sturen, maar om de beroepsbeoefenaren in het hbo handvatten te geven bij het nadenken over en doen van onderzoek. Dit artikel gaat over onderzoek in het hbo waarbij we vanwege de vertrouwdheid daarmee de lerarenopleiding primair onderwijs als case nemen. Achtereenvolgens wordt beschreven waarom onderzoek in het hbo en op de lerarenopleiding nodig is, hoe dat onderzoek omschreven kan worden en eruitziet en tot slot gaan we in op de winst voor studenten, de opleiding en beroepspraktijk.
Onderzoek doen als competentie van een hogeschool
Jansen, R.M.C. ; Beer, F.H. de ; Pool, E.M.C. van der ; Geerdink, G. ; Heine, Wim ; Pauwelussen, J.P.
2008, Article / Letter to editor (Onderwijsinnovatie, vol. 10, iss. 2, (2008), pp. 10-13)Met de komst van lecoraten zijn hogescholen zich ook gaan richten op ‘toegepast onderzoek’. Maar past dat wel in het hbo? En zo ja, hoe implementeer je dat? Dit artikel beschrijft hoe binnen de HAN de competentie ‘Onderzoek doen’ hogeschoolbreed is ingekaderd.
Monitoring winter road conditions using commonly available vehicle variables for cooperative applications
Padarthy, M. ; Heyns, E.E. ; Tillema, F. ; Huijboom, C.N. ; Schotman, Rick
2018, Article in monograph or in proceedings (ITS World Congress 2018)
Measurements on a solar greenhouse combining cooling and electrical energy production
Tuijl, E.A. van ; Sonneveld, P.J. ; Janssen, H.J.J. ; Campen, J. van ; Bot, G. ; Swinkels, Gert-Jan
2010, Article / Letter to editor (Biosystems Engineering, iss. 106, (2010), pp. 48-57)Performance results are given of a new type of greenhouse, which combines reflection of near infrared radiation (NIR) with electrical power generation using hybrid photovoltaic cell/thermal collector modules. Besides the generation of electrical and thermal energy, the reflection of the NIR will result in improved climate conditions in the greenhouse. In a previous paper (Sonneveld, P. J., Swinkels, G. L. A. M., Bot, G. P. A., & Flamand, G. (2010). Feasibility study for combining cooling and high grade energy production in a solar greenhouse. Biosystems Engineering, 105, 51–58) a design and feasibility study of this electricity-producing greenhouse was presented. After the description of the construction of this greenhouse, the peak power for Dutch climate circumstances is determined based on the amount of electrical and thermal energy (hot water) produced. The typical yearly yield of this greenhouse system is determined as a total electrical energy of 20 kW h m-2 and a thermal energy of 160 kW h m-2. Improvements are possible in the spectral range of the NIR film and in the focusing unit of the system. In future the improved electricity-producing greenhouse system could generate 31 kW h m-2 of electrical energy and 270 kW h m-2 of thermal energy, so it could operate independent of fossil fuels.
Leren Communiceren
Zeijl, Willem van der ; Jansen, R.M.C. ; Pool, E.M.C. van der ; Steehouder, Michaël ; Mulder, Judith
2012, Book (monograph) Al meer dan dertig jaar is Leren communiceren een veel gebruikt handboek in het hoger onderwijs. Of het nu gaat om communicatieonderwijs in aparte vakken of om vaardighedentraining die is geïntegreerd in projecten, stages en opdrachten, Leren communiceren is de communicatieleidraad bij uitstek. In deze zesde druk wordt aangesloten bij nieuwe ontwikkelingen in het vakgebied, en wordt ingespeeld op de snelle veranderingen in de informatietechnologie en op nieuwe mediatoepassingen. Ten slotte is er een uitgebreid supplement waarin problemen rond spelling en het gebruik van leestekens worden behandeld. Op de bijbehorende website www.lerencommuniceren.noordhoff.nl is oefenmateriaal te vinden dat aansluit bij deze zesde editie. De website biedt tevens extra ondersteunend materiaal bij het boek, zoals een sjabloon voor het maken van bouwplannen en een aantal videofragmenten ter illustratie van belangrijke mondelinge vaardigheden.
Lenses Based Concentrated PV system in a Greenhouse
Fresnel, A. ; Tuijl, E.A. van ; Janssen, H.J.J. ; Sonneveld, P.J. ; Swinkels, Gert-Jan
2011, Article / Letter to editor (Acta Horticulturae, iss. 893, (2011), pp. 343-350)The scope of this investigation is the development and testing of a new type of greenhouse with an integrated linear Fresnel lens, receiver module and an innovative system for tracking to exploiting all direct radiation in a solar energy system.
Kwaliteit van leven en de grondslagen van de capabilitybenadering
Jansen, R.M.C. ; Braber, Collin den ; Tirions, Michel
2018, Part of book or chapter of book (, pp. 27-47)Dit hoofdstuk behandelt de grondslagen van de capabilitybenadering. De capabilitybenadering is een normatief-wetenschappelijk kader waarin de kwaliteit van leven van mensen centraal staat. Het individueel menselijk welbevinden wordt door de capabilitybenadering als maatstaf gehanteerd voor wat als normatief goed moet worden beschouwd. Elk mens moet worden gezien als een doel op zichzelf en elk individu verdient het om een goed leven te kunnen leiden. Kern van de benadering is dat iemands welzijn bepaald wordt door de mate van vrijheid van een persoon om het leven te leiden dat hij of zij zelf waardevol vindt. Dit hoofdstuk geeft een inleiding in de basisbegrippen van de capabilitybenadering die houvast kunnen bieden bij het toepassen van de benadering. Ten slotte gaat dit hoofdstuk in op de voorwaarden voor de ontwikkeling van een capability-praktijktheorie voor het sociale domein.
Kritisch en krachtig : sociale innovatie in professionele leergemeenschappen
Jansen, R.M.C. ; Meesters, Joos ; Kindt-van Esch, Marjan ; Hendriks, Ivo ; Verharen, E.A.J.
2017, Part of book or chapter of book (Sociale innovatie in de praktijk, pp. 135-150)Sociale innovatie gaat om de bundeling van menskracht met als doel uiteenlopende maatschappelijke kwesties aan te pakken. Sociale innovatie heeft betrekking op nieuwe arrangementen van burgers, overheden en/of bedrijven die maatschappelijke energie opwekken om bijvoorbeeld armoede of sociale ongelijkheid tegen te gaan, arbeidsparticipatie te bevorderen of alternatieve initiatieven te ondersteunen. Het gaat daarbij om het scheppen van publieke meerwaarde. De verwachtingen over sociale innovatie als oplossing voor hedendaagse maatschappelijke problemen zijn vaak hooggespannen. In Sociale innovatie in de praktijk vragen auteurs zich af of en in hoeverre deze verwachtingen in de praktijk worden waargemaakt. Wat wordt onder sociale innovatie verstaan? Hoe werkt ze en wat is de praktische betekenis ervan? Vragen als deze worden van diverse, en soms ook ontnuchterende, antwoorden voorzien.
Investigation the Advantages of CPV for Building Integrated PV : 28th European Photovoltaic Solar Energy Conference
Sonneveld, P.J. ; Craats, S. van der ; Sparemberger, A.R. ; Sahedi, J.V. ; Catau, R.G.
2013, Article in monograph or in proceedings (28th European Photovoltaic Solar Energy Conference)The objective of this concept is a significant reduction of energy consumption in greenhouses and buildings with large facades and windows by using available solar energy. The scope of this investigation is to study the advantages of a building integrated CPV system. The basic idea is that a larger fraction of the available solar energy can be converted to useful energy, a better indoor climate and higher crop yield (for greenhouses). The building integrated CPV systems as proposed is able to deliver at least four benefits for buildings: Electrical- and thermal energy generation, illumination by using the remaining diffuse light and better indoor climate circumstances which arise by the removal of the energy-rich direct radiation. Yields for the Dutch climate situation are estimated to be 120 kWh/m2 of electrical energy and 300 kWh/m2 thermal energy, which can be used for energy supply and/or operation of an extra cooling system. These figures can be translated in financial benefits: Calculated payback time is six year for the system that is presented here.
Investigation of pothole detection using in-vehicle data for cooperative applications
Sami, Mohammed ; Padarthy, M. ; Heyns, E.E. ; Huijboom, C.N. ; Tillema, F.
2019, Article in monograph or in proceedings (ITS World Congress 2019)
Interpersonal Community Psychiatric Treatment for non-psychotic chronic patients and nurses in outpatient mental health care : A controlled pilotstudy on feasibility and effects
Smit, M.A. ; Schene, A. ; Meijel, B. van ; Kaasenbrood, A. ; Hutschemaekers, Giel ; Koekkoek, B.W.
2012, Article / Letter to editor (International Journal of Nursing Studies, vol. 49, iss. 5, (2012), pp. 549-559)In psychiatric care professionals perceive some patients as ‘difficult’, especially patients with long-term non-psychotic disorders. For these patients few evidence-based treatments exist. An intervention program, Interpersonal Community Psychiatric Treatment (ICPT), was developed by the authors. It was evaluated with the aim to increase effective behaviours by both patients and community psychiatric nurses (CPNs). ICPT is one of very few intervention programs aimed at ‘difficult’ non-psychotic chronic patients. In this pilot study was found that it can be successfully carried out by CPNs, is generally experienced as acceptable and useful by patients and CPNs alike, and results in some significantly better effects on both process and outcome measures. In the main study, some alterations will be made to the instruction manual and training program. Also, the diagnostic interview may be briefer, and the characteristics and treatment integrity of CPNs will be included in measurements. Further controlled and randomized research is needed to test the effectiveness of the program in a larger group of patients.
Innovative Approaches to Improve Sustainability of Physical Distribution in Dutch Agrifood Supply Chains
Pieters, R. ; Beek, R.A. van ; Omta, Onno ; Glöckner, Hans-Heinrich
2017, Part of book or chapter of book (Efficiency in Sustainable Supply Chain, pp. 31-52)Duurzaamheid heeft een belangrijk aandeel in alle aspecten van bedrijfsbeleid. Dit geldt ook voor bedrijven die opereren in een landbouw supply chain. De meeste literatuur beschrijft het verminderen van voedselverlies of voedselveiligheid, maar er is weinig aandacht besteedt aan hoe organisaties die opereren in landbouw supply chains nieuwe technieken en innovaties gebruiken om fysieke distributie duurzamer te maken. Dit artikel beschrijft een onderzoek over bedrijven in deze supply chains en hoe nieuwe innovaties gebruikt worden. Hiervoor zijn de topmanagers van veertien Nederlandse bedrijven geïnterviewd: zes logistieke dienstverleners, drie groothandelaren en vijf foodprocessors. Er is gebleken dat verschillende schakels in de keten de voorkeur hebben voor verschillende innovaties. De foodprocessors hebben de voorkeur voor innovaties voor een reductiestrategie en groothandelaren zijn meer gericht op innovaties gerelateerd aan innovatiestrategieën. De toegepaste innovaties waren niet gelinkt aan de supply chain in het geheel, maar geconcentreerd op een specifiek deel van de supply chain. Dit was meestal geïnitieerd door een partner van buiten de landbouw supply chains.
Innovaties in duurzame energie: de oplossing om uit de crisis te komen : Portret: Piet Sonneveld
Sonneveld, P.J.
2014, Article / Letter to editor (Thematische impuls: Energie, vol. 2014, iss. januari, (2014), pp. 60-63)Toen dr. ing. Piet Sonneveld ruim twee jaar geleden als lector Duurzame Energie bij de Hogeschool van Arnhem en Nijmegen (HAN) begon, had hij een stoel, een bureau, een telefoon en een laptop. ‘Voor het onderwijs was wel plaats gereserveerd, maar voor onderzoek was er fysiek, gevoelsmatig en organisatorisch eigenlijk nog geen ruimte. Ik moest het van de grond opbouwen.’
High-Concentration Solar Energy Systems for the Built Environment
Smit, M.A. ; Catau, R.G. ; Sonneveld, P.J. ; Cremer, H.A.P. ; Sluijs, M.V. van der
2018, Part of book or chapter of book (Urban and Transit Planning)
Het verbinden van formele en informele ondersteuning met vraagpatronen
Jansen, R.M.C. ; Biene, M. van
2010, Part of book or chapter of book (, pp. 178-188)In dit hoofdstuk wordt ingegaan op de toepassing van vraagpatronenonderzoek als middel om formele en informele ondersteuning te verbinden. Hierbij wordt nadrukkelijk niet alleen gekeken naar zorg, maar ook naar meer brede vormen van ondersteunende activiteiten waar burgers van profiteren en in participeren. In deze benadering worden burgers in hun kracht gezet, in tegenstelling tot de zogeheten doelgroepenbenadering waarbij burgers benaderd worden in termen van problematieken of typen burgers. Door consequent de dialoog en de cocreatie te zoeken wordt gestreefd naar nieuwe verbindingen tussen formele en informele dienstverlening. Hiermee wordt concrete invulling gegeven aan het begrip Civil Society, waarin burgers actief betrokken zijn bij hun samenleving. Aan de hand van een vraagpatronenonderzoek in de Nijmeegse wijk Hatert wordt uitgelegd hoe de innovatiemethodiek in zijn werk gaat en hoe praktijkinnovatie in formele en informele ondersteuning gestalte krijgt.
Het collectieve leerproces in een community of learning
Biene, M. van ; Lips, K. ; Jansen, R.M.C.
2010, Article / Letter to editor (Onderwijsinnovatie, vol. 2010, iss. 3, (2010), pp. 29-34)De noodzaak voor docentprofessionalisering is in dit tijdschrift al veelvuldig beschreven. Daarbij ligt het accent vaak op het individu. Maar juist collectieven zoals kenniskringen en lectorarten hebben een bijzonder vermogen om samen te leren. Het instellen van een kennisgemeenschap, zoals een Community of Learning (CoL), is een manier om van individuele leerprocessen collectieve leerprocessen te maken.
Greenhouse with a CPV system and NIR reflecting lamellae
Janssen, H.J.J. ; Tuijl, E.A. van ; Swinkels, Gert-Jan ; Sonneveld, P.J. ; Bot, G.
2012, Article / Letter to editor (Acta Horticulturae, iss. 927, (2012), pp. 43)In previous research a new type of greenhouse with an integrated concentrated photovoltaic system (CPV) was developed based on a circular covering geometry and an integrated filter for reflecting the near infrared radiation (NIR) of the greenhouse and exploiting this radiation in a solar energy system. The performance of the system was promising. In this study further optimalisation of the CPV system is made to avoid the large construction for solar tracing and the high investment. Hereto all parts for the solar concentrating system will be integrated into the greenhouse. The NIR-reflector material is carried out as a NIR-reflective lamellae system and the CPV-module is mounted into the ridge. In this paper the results of the optimization process of the CPV system based on NIR reflecting lamellae is presented. The optimization process is based on a maximal total annual electricity production and is performed with a ray tracing model and actual radiation data. Results show that the optimization of the lamellae greenhouse can be seen from a theoretical and a practical point of view. Theoretically, the number of lamellae for the investigated concept must be high (>100) and focus with a generic focal length of 3.5 m and glazing bars must be avoided. Then the maximal annual electricity output can be over 26 kWh/m2. In practice, mechanical restrictions, plant conditions and costs will determine the implementation. The proposed CPV-system has positive side-effects like reducing the heat load (and the need for cooling) during summer and blocking of the direct radiation which can be harmful for some crops. With this, the feasibility of the system depends greatly on local conditions which require a tailor-made economic analysis.
Feasibility study for combining cooling and high grade energy production in a solar greenhouse
Flamand, G. ; Bot, G. ; Swinkels, Gert-Jan ; Sonneveld, P.J.
2010, Article / Letter to editor (Biosystems Engineering, iss. 105, (2010), pp. 51-58)Throughout the world greenhouse horticulture is expanding and intensifying. The expansion is driven by the much higher production levels that are achieved in greenhouses compared to open fields. This provides increased income for farmers and a positive effect on rural development. Intensification is driven by the demand for better control of the production process resulting in higher yield but, more importantly, higher product quality. As a result products can meet the standards of the fast expanding consumer market for high quality fresh products, driven by the booming new economies. However greenhouse horticulture also faces major problems. In northern countries, with cold winter climates, greenhouses have to be heated for optimal growing conditions so energy supply is an important issue. In the southern countries with the combination of high global radiation and high outdoor temperatures during summer, cooling of greenhouses is needed during this period. Solutions for energy supply in winter and cooling in summer can be combined applying seasonal storage of excess solar energy and exploiting this for heating in winter. The advantage of this system is cheaper cooling, and energy savings of about 35% compared to heating by furnace. The disadvantage is that the excess solar energy is converted to low grade thermal energy which is stored at a temperature level of about 18 °C. This can only be exploited for heating in winter by a heat pump, driven by high grade energy such as electricity. Here, the feasibility of a novel approach is investigated of a greenhouse design combining cooling with energy supply in such a way that excess solar energy is directly converted to high grade electric energy. A prototype greenhouse according to this design is under construction. In a following paper the experimental results of this prototype greenhouse will be presented.
Expanding Capabilities in Integrated Service Areas (ISAs) As Communities of Care : A Study of Dutch Older Adults’ Narratives on the Life They Have Reason to Value
Jansen, R.M.C. ; Kam, George de ; Pijpers, R.
2017, Article / Letter to editor (Journal of Human Development and Capabilities, (2017))We apply the capability approach to understand the scope and limitations of community efforts to support older adults dwelling in integrated service areas (ISAs) in the Netherlands. An ISA is a neighborhood-based form of care organization aimed at the widening of opportunities to achieve well-being goals by building on local community resources. To gain insight in the complex effects of ISAs on older adults’ well-being, a narrative study was performed on their daily lived experiences. Emerging narrative patterns were aggregated in a Manifesto of the Independently Living Older Person. Narrative patterns and Manifesto provided insight in both respondents’ capabilities and functionings, expressing values such as autonomy, human dignity and contributions to community care by older adults themselves. Older adults balance realistic and optimistic expectations for the future in ways that can be explained using the concepts of capability security, adaptive preferences, care-receiving and caring-with. Since interventions transpire through local interactions and shared practices, ISAs represent a social space in between individuality and collectivity where older adults enact community by sharing common ends. Findings imply that the complex interventions developed in ISAs expand older adults’ capabilities involving the challenge for all stakeholders to negotiate individual freedoms in community care settings.
Energy performance of a concentrated photovoltaic energy system with static linear Fresnel lenses integrated in a greenhouse
Tuijl, E.A. van ; Sonneveld, P.J. ; Campen, J. van ; Swinkels, Gert-Jan ; Janssen, H.J.J. ; Bot, G.
2011, Article / Letter to editor (Solar Energy, vol. 2011, iss. 85, (2011), pp. 432-442)A new type of greenhouse with linear Fresnel lenses in the cover performing as a concentrated photovoltaic (CPV) system is presented. The CPV system retains all direct solar radiation, while diffuse solar radiation passes through and enters into the greenhouse cultivation system. The removal of all direct radiation will block up to 77% of the solar energy from entering the greenhouse in summer, reducing the required cooling capacity by about a factor 4. This drastically reduce the need for cooling in the summer and reduce the use of screens or lime coating to reflect or block radiation. All of the direct radiation is concentrated by a factor of 25 on a photovoltaic/thermal (PV/T) module and converted to electrical and thermal (hot water) energy. The PV/T module is kept in position by a tracking system based on two electric motors and steel cables. The energy consumption of the tracking system, ca. 0.51 W m-2, is less than 2% of the generated electric power yield. A peak power of 38 W m-2 electrical output was measured at 792 W m-2 incoming radiation and a peak power of 170 W m-2 thermal output was measured at 630 W m-2 incoming radiation of. Incoming direct radiation resulted in a thermal yield of 56% and an electric yield of 11%: a combined efficiency of 67%. The annual electrical energy production of the prototype system is estimated to be 29 kW h m-2 and the thermal yield at 518 MJ m-2. The collected thermal energy can be stored and used for winter heating. The generated electrical energy can be supplied to the grid, extra cooling with a pad and fan system and/or a desalination system. The obtained results show a promising system for the lighting and temperature control of a greenhouse system and building roofs, providing simultaneous electricity and heat. It is shown that the energy contribution is sufficient for the heating demand of well-isolated greenhouses located in north European countries.
Effect of condensation on light transmission and energy budget of seven greenhouse cover materials
Mohammadkhani, V. ; Swinkels, Gert-Jan ; Stanghellini, C. ; Sonneveld, P.J. ; Bruins, M.A.
2011, Article / Letter to editor (Acta Horticulturae, iss. 952, (2011), pp. 249-254)Model calculations and the few data that are available show that over 100 L water condense yearly on each square meter of a greenhouse cover. It is known that the presence of condensate reduces light transmission. This effect is suppressed to some extent by adding film-forming (anti-drop) additives to plastic film covers and surface structures or coatings on hard cover materials. There is a need, therefore to assess the effect of the surface treatment on the loss of light. On the other hand, condensation releases the energy that was used for evaporation, thereby warming-up the cover and somewhat decreasing the heating requirement of the greenhouse. The amount of condensation energy that is recovered may be expected to depend on the external and internal climate conditions. In this work we analysed the effect of condensation on light transmission and energy budget of a greenhouse, with seven different cover materials. Various internal vs external conditions were created by placing the model greenhouse (about 3?4 m) in a large climate chamber. Each experiment was repeated for two temperature differences between inside and outside (10 and 20°C) and two air movements in the greenhouse (7.5 and 15 cm s-1). Light transmissivity was reduced by 9% on average, with large differences among materials. Anti-drop coatings did suppress this effect, as did a surface structure meant to increase light diffusivity of the material. As far as energy is concerned, the overall heat transfer coefficient (U-value) of the greenhouse increased by an average of 16% (single layers) or 12% (double layer covers) when wet. Obviously there was an effect of the temperature difference on the U-value, which was found to be consistent with the heat transfer theory, whereas little effect was found of the air movement within the house.
Determining the Future Business Case for Small-Scale Hydrogen Storage of Renewable Energy for Autonomous Residential Applications
Smit, M.A. ; Balvert, R. van den
2018, Part of book or chapter of book (Urban and Transit Planning, pp. 423-429)
Design of a Solar Greenhouse with Energy Delivery by the Conversion of Near Infrared Radiation - Part 1 Optics and PV-cells
Swinkels, Gert-Jan ; Sonneveld, P.J. ; Bot, G.
2009, Article / Letter to editor (Acta Horticulturae, iss. 807, (2009), pp. 47-53)In this paper the design and development of a new type of greenhouse with an integrated filter for reflecting near infrared radiation (NIR) and a solar energy delivery system is described. Especially the optical parts as the spectral selective film, the properties of the circular reflector and the efficiencies of photo voltaic cells are studied. As a first measure, the spectral selective cover material, which prevents the entrance of NIR radiation, is investigated. It has to block up to 35% of the solar energy outside the greenhouse, which will reduce the needed cooling capacity. The second measure is the integration with a solar energy system. When the NIR reflecting coating is designed as a circular shaped reflector integrated in the greenhouse, the reflected solar energy of a PhotoVoltaic (PV) cell in the focus point delivers electric energy. With a ray tracing computer program the optimal geometry of the reflector was designed with respect to the collecting efficiency. The PV cells mounted in the focal point require cooling due to the high heat load of the concentrated radiation (geometric concentration factor of 30). The properties of different PV materials were investigated to find the optimal cell for this application. Cooled greenhouses are an important issue to cope with the combination of high global radiation and high outdoor temperatures. All parts are integrated in a 100m2 prototype greenhouse which will be applied for the proof of principle.
Design of a NIR concentrator system integrated in a greenhouse
Sonneveld, P.J. ; Swinkels, Gert-Jan ; Janssen, H.J.J. ; Tuijl, E.A. van
2012, Article / Letter to editor (Acta Horticulturae, iss. 952, (2012), pp. 523)In this paper the design and development of a new type of greenhouse with an integrated filter for reflecting near infrared radiation (NIR) and a solar energy delivery system is described. Especially the optical parts as the spectral selective film, the properties of the circular reflector and the efficiencies of photo voltaic cells are studied. As a first measure, the spectral selective cover material, which prevents the entrance of NIR radiation, is investigated. It has to block up to 35% of the solar energy outside the greenhouse, which will reduce the needed cooling capacity. The second measure is the integration with a solar energy system. When the NIR reflecting coating is designed as a circular shaped reflector integrated in the greenhouse, the reflected solar energy of a PhotoVoltaic (PV) cell in the focus point delivers electric energy. With a ray tracing computer program the optimal geometry of the reflector was designed with respect to the collecting efficiency. The PV cells mounted in the focal point require cooling due to the high heat load of the concentrated radiation (geometric concentration factor of 30). The properties of different PV materials were investigated to find the optimal cell for this application. Cooled greenhouses are an important issue to cope with the combination of high global radiation and high outdoor temperatures. All parts are integrated in a 100m2 prototype greenhouse which will be applied for the proof of principle.
De capabilitybenadering en het sociaal werk: wederkerige partners?
Jansen, R.M.C. ; Brummel, A. ; Verharen, E.A.J.
2018, Part of book or chapter of book (, pp. 67-84)Om de vraag te beantwoorden wat de capabilitybenadering het sociale domein te bieden heeft, kijken we naar de bruikbaarheid van de capabilitybenadering voor het brede werkveld van welzijn, samenleven en zorg. Aandachtsgebieden van de capabilitybenadering die bruikbaar zijn voor het werkveld zijn: (1) sterke relatie tussen individu en omgeving; (2) integrale benadering van menselijk functioneren; (3) nadruk op keuzemogelijkheden; en (4) de aandacht voor structurele patronen van sociale ongelijkheid. We bekijken het ook andersom: sociaalwerkpraktijken sluiten op verschillende manieren aan bij de capabilitybenadering. Zij proberen positieve vrijheid van individuen te faciliteren, werken aan thema’s als armoede, ongelijkheid en eenzaamheid, en maken veel gebruik van krachtgerichte benaderingen. Daarin staat het sociaal werk echter niet alleen. Het conceptueel kader dat de capabilitybenadering het sociale domein biedt staat een kritische blik toe op sociaal werk als middel naast andere disciplines waarin individuele kwaliteit van leven centraal staat.
CPV System with Static Linear Fresnel Lenses in a Greenhouse
Sonneveld, P.J. ; Zahn, H. ; Swinkels, Gert-Jan
2010, Article / Letter to editor (AIP Conference Proceedings, iss. 1277, (2010), pp. 264-267)A new CPV system with a static linear Fresnel lens, silicon PV module suitable for concentrated radiation and an innovative tracking system is integrated in a greenhouse covering. The basic idea of this horticultural application is to develop a greenhouse for pot plants (typical shadow plants) which don’t like high direct radiation. Removing all direct radiation will block up to 77% of the solar energy, which will reduce the necessary cooling capacity. The solar energy focused on the Thermal Photovoltaic (PV/T) module generates electric and thermal energy. The PV/T module is tracked in the focal line and requires cooling due to the high heat load of the concentrated radiation (concentration factor of 50 times). All parts are integrated in a greenhouse with a size of about 36?m2. The electrical and thermal yield is determined for Dutch climate circumstances. Some measurements were performed with a PMMA linear Fresnel lens between double glass. Further improvement of the performance of the CPV-system is possible by using a PDMS lens directly laminated on glass and using AR-coated glass. This lens is developed with ZEMAX and the results of the Ray-tracing simulations are presented with the lens structure oriented in an upwards and downwards position. The best performance of the static linear Fresnel lens is achieved with upwards orientation of the lens structures. In practice this is only possible with the Fresnel lens placed between a double glass structure, which will keep the lens clean and free of water.
CPV system based on NIR reflecting lamellae integrated into a greenhouse: Optimizing of Optics
Sonneveld, P.J. ; Swinkels, Gert-Jan
2010, Article / Letter to editor (Advances in Science and Technology, 5th Forum on new materials Part C, iss. 74, (2010), pp. 297-302)In an previous research project a new type of greenhouse with an integrated concentrated photovoltaic system (CPV) was developed which has an integrated filter for reflecting the near infrared radiation (NIR) to the greenhouse and exploiting this radiation in a solar energy system. The performance of the system was promising. In this study further optimalisations of the CPV system are made to avoid the large construction for solar tracting. Hereto all parts will be integrated into the greenhouse. The NIR-reflector material is carried out as a NIR-reflective lamllea system and the CPV–module is mounted into the ridge. In this paper the results of the optimization process of the CPV system based on NIR reflecting lamellae is presented. The optimization process is based on a maximal total annual electricity production and is performed with a ray tracing model and actual radiation data. Results show that the optimization of the lamellae greenhouse can be seen from a theoretical and a practical point of view. Theoretically, the number of lamellae for the investigated concept must be high (>100) and focus with a generic focal length of 3.5 m and glazing bars must be avoided. Then the maximal annual electricity output can be over 26 kWh/m². In practice, mechanical restrictions, plant conditions and costs will determine the implementation. The proposed CPV-system has positive side-effects like reducing the heat load (and need for cooling) during summer and blocking of the direct radiation which can be harmful for some crops. With this, the feasibility of the system depends greatly on local conditions which require a tailor-made economical analysis
Commerciële bijlage van Mediaplanet
Smit, M.A.
2018, Contribution for newspaper or weekly magazine (Financieel Dagblad, 27 september 2018)
Commerciële bijlage Elsevier Weekblad mijnzakengids.nl
Smit, M.A.
2018, Contribution for newspaper or weekly magazine (mijnzakengids.nl, )
Climate Control of a Greenhouse with Concentrating Solar Power System : International Conference on Agricultural Engineering
Sonneveld, P.J. ; Bochove, I. van
2013, Article in monograph or in proceedings (International Conference on Agricultural Engineering)There are several greenhouses built with solar panels integrated into the roof. In summer time this will operate very well, although broad shadow stripes can result in growth and yield differences. In winter the amount of sunlight is further limited by the solar panels and will result in further reduction of light accession to the cultivation space. As a result, the crops suffer from growth problems. These drawbacks are eliminated by the application of Concentrating Power Systems (CSP) with Fresnel lenses. A Fresnel lens works like a normal lens but is much thinner. When the sun shines, the lens receives both direct and indirect sunlight. The lens will concentrate all direct sunlight, which can be collected as thermal energy in the focal point. This absorbed radiation can be converted with an absorption cooler into cold water for cooling. This cold water can cool the greenhouse without the need of water use. The indirect solar radiation, the diffuse light will not focus and is therefore available as a fairly constant light source in the building or in the greenhouse. The capture of all direct radiation at high intensities will diminish the incoming heat load, which is useful for a better internal climate control of greenhouses and buildings. This lower heat load makes it easier to keep the greenhouse cool with the absorber. In this study the details of energy flows and thermal conversion with absorption cooler is determined. Calculation shows a 47% heat load reduction (from 337 W/m2 to 157 W/m2) with the Fresnel lenses in the covering of the greenhouse. In the case of the collector in focus, only 48% of the captured direct radiation, available as thermal energy, is required to cool the greenhouse further with an absorption cooler. Cooling a greenhouse can result in up to 90% reduction in water consumption of the cultivation. The possibility of light regulation is another important advantage the Fresnel lenses have. The light amount can vary between 15 – 77% of the incoming radiation. The access of the generated energy can be used for extra illumination (light and energy regulation) and/or energy supply and/or a desalination system.
Beyond chronological age. Examining perceived future time and subjective health as age-related mediators in relation to work-related motivations and well-being
Lange, A.H. de ; Jansen, R.M.C. ; Kooij, Dorien ; Dikkers, Josje
2013, Article / Letter to editor (Work & Stress: An International Journal of Work, Health & Organisations, vol. 27, iss. 1, (2013), pp. 88-105)Since workforces across the world are aging, researchers and organizations need more insight into how and why occupational well-being, together with work-related attitudes and motivations, change with age. Lifespan theories point to subjective health and future time perspective (i.e. an individuals perceptions of his or her remaining time to live) as potentially relevant age-related variables. Using two Dutch samples, a health care company (N=448) and university employees (N=1271), we examined whether subjective health and future time, perceived as open-ended or limited, mediate the relation between age and work-related motivations (growth, security, esteem and generativity), and whether those motivations in turn influence work engagement. In line with lifespan theories, the study demonstrated that the relations of chronological age with work-related growth, esteem and security motivations were mediated by an open-ended future time perspective and a good subjective general health. The association between age and generativity motivations was not mediated by a limited future time perspective. Furthermore, growth, esteem and generativity motivations had a positive association with work engagement. These findings imply that the future time perspective and subjective health of older workers should be taken into account, and not just chronological age, when examining or managing their occupational well-being.
Afgezonderd of ingesloten? : Over sociale kwetsbaarheid van ouderen
Jansen, R.M.C.
2017, Article / Letter to editor (Journal of Social Intervention : Theory and Practice, vol. 26, iss. 1, (2017), pp. 88-92)Boekbespreking: Anja Machielse (2016). Afgezonderd of ingesloten? : Over sociale kwetsbaarheid van ouderen. Utrecht: Universiteit voor Humanistiek. 2016, 60 p., ISBN 9789082535822
A socio-emotional selectivity perspective on age-related differences in reactions to psychological contract breach
Bal, Matthijs ; Jansen, R.M.C. ; Lange, A.H. de ; Velde, Mandy van der
2013, Article / Letter to editor (Applied Psychology: an International Review, vol. 2013, iss. 62, (2013), pp. 157-181)The current paper investigated age-related differences in the relations of psychological contract breach with work outcomes over time. Based on affective events theory, we expected job satisfaction to mediate the longitudinal relationship of contract breach with changes in job performance. Moreover, based on socio-emotional selectivity theory, it was predicted that reactions to contract breach on job satisfaction and job performance would be stronger among younger workers than older workers. This two-wave panel study among 240 employees investigated interactions of age with psychological contract breach in relation to changes in job satisfaction and job performance over time. Moderated structural equation modeling showed that job satisfaction partially mediated the longitudinal relationships between contract breach and job performance. Moreover, the analyses supported socio-emotional selectivity theory; older workers reacted less intensely to psychological contract breach towards job satisfaction and job performance, indicating a general decreased responsiveness of older workers towards the psychological contract. It is concluded that age plays an important role in how contract breaches relate to changes in work outcomes over time.
A novel structured plastic substrate for light confinement in thin film silicon solar cells by a geometric optical effect
Baggerman, J. ; Swinkels, Gert-Jan ; Sonneveld, P.J. ; Rijn, C.J.M. van ; Schropp, R.E.I. ; Holterman, H.J. ; Hamers, K. ; Rath, J.K. ; Jong, Reinhard de
2012, Article / Letter to editor (Journal of Non-Crystalline Solids, vol. 17, iss. 358, (2012), pp. 2308-2312)We present a novel method to achieve light trapping in thin film silicon solar cells. Unlike the commonly used surface textures, such as Asahi U-type TCO, that rely on light scattering phenomena, we employ embossed periodically arranged micro-pyramidal structures with feature sizes much larger than the wavelength of visible light. Angular resolved transmission of light through these substrates indeed showed diffraction patterns, unlike in the case of Asahi U-type substrates, which show angular resolved scattering. Single junction amorphous silicon (a-Si) solar cells made at 125 °C on the embossed structured polycarbonate (PC) substrates showed an increase in current density by 24% compared to a similar solar cell on a flat substrate. The band gap and thickness of the i-layer made by VHF PECVD are 1.9 eV and 270 nm respectively. A double p-layer (nc-Si:H/a-Si:H) was used to make proper contact with ZnO:Al TCO. Numerical modeling, called DokterDEP was performed to fit the dark and light current–voltage parameters and understand the characteristics of the cell. The output parameters from the modeling suggest that the cells have excellent built-in potential (Vbi). However, a rather high recombination voltage, Vµ, affects the FF and short circuit current density (Jsc) for the cells on Asahi as well as for the cells on PC. A rather high parallel resistance » 1 MO cm2 (obtained from the modeling) infers that there is no significant shunt leakage, which is often observed for solar cells made at low temperatures on rough substrates. An efficiency of more than 6% for a cell on PC shows enormous potential of this type of light trapping structures.
a longitudinal study of age-related differences in reactions to phsycological contract breach
Jansen, R.M.C. ; Lange, A.H. de ; Bal, Matthijs ; Velde, Mandy van der
2013, Article / Letter to editor (Applied Psychology: an International Review, vol. 62, iss. 1, (2013), pp. 157-181)The current paper investigated age-related differences in the relations of psychological contract breach with work outcomes over time. Based on affective events theory, we expected job satisfaction to mediate the longitudinal relationship of contract breach with changes in job performance. Moreover, based on socio-emotional selectivity theory, it was predicted that reactions to contract breach on job satisfaction and job performance would be stronger among younger workers than older workers. This two-wave panel study among 240 employees investigated interactions of age with psychological contract breach in relation to changes in job satisfaction and job performance over time. Moderated structural equation modeling showed that job satisfaction partially mediated the longitudinal relationships between contract breach and job performance. Moreover, the analyses supported socio-emotional selectivity theory; older workers reacted less intensely to psychological contract breach towards job satisfaction and job performance, indicating a general decreased responsiveness of older workers towards the psychological contract. It is concluded that age plays an important role in how contract breaches relate to changes in work outcomes over time.

Now showing items 1-45 of 45

Browse by Lectorate "Duurzame Energie"

Browse

All of HAN Publications