Performance of a concentrated photovoltaic energy system with static linear Fresnel lenses
Performance of a concentrated photovoltaic energy system with static linear Fresnel lenses
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DOI：
10.1016/j.solener.2010.12.001
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发表时间：
2011-03
期刊：
影响因子：
6.7
通讯作者：
P. Sonneveld;G. Swinkels;B. V. Tuijl;H. Janssen;J. Campen;G. Bot
中科院分区：
文献类型：
--
作者：
P. Sonneveld;G. Swinkels;B. V. Tuijl;H. Janssen;J. Campen;G. Bot
提出了一种新型温室，其罩面采用线性菲涅耳透镜作为聚光光伏系统。CPV系统保留了所有的太阳直接辐射，而太阳漫射辐射穿过并进入温室栽培系统。在夏季，所有直接辐射的消除将阻止高达77%的太阳能进入温室，所需的冷却能力将减少约1 / 4。这大大减少了夏季对冷却的需求，并减少了屏幕或石灰涂层的使用，以反射或阻挡辐射。所有的直接辐射以25倍的倍数集中在光伏/热（PV/T）模块上，并转换为电能和热能（热水）。PV/T模块通过基于两个电动机和钢缆的跟踪系统保持在位置上。跟踪系统的能耗约为0.51Wm−2，小于发电量的2%。在792Wm−2入射辐射下测得38Wm−2电输出的峰值功率，在630Wm−2入射辐射下测得170Wm−2热输出的峰值功率。进入的直接辐射导致56%的热产率和11%的电产率：综合效率为67%。原型系统的年发电量估计为29kWhm−2，热产量为518MJm−2。收集的热能可以储存起来，用于冬季供暖。产生的电能可以提供给电网，额外的冷却与垫和风扇系统和/或脱盐系统。所获得的结果显示了一个有前途的系统，用于温室系统和建筑屋顶的照明和温度控制，同时提供电力和热量。研究表明，这些能量贡献足以满足北欧国家隔离良好的温室的供暖需求。
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. 0.51Wm−2, is less than 2% of the generated electric power yield. A peak power of 38Wm−2electrical output was measured at 792Wm−2incoming radiation and a peak power of 170Wm−2thermal output was measured at 630Wm−2incoming 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 29kWhm−2and the thermal yield at 518MJm−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.