Browsing by Author "Campen, J. van"

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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.
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.

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Browsing by Author "Campen, J. van"

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