共查询到19条相似文献,搜索用时 203 毫秒
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太阳能建材技术的研究与开发(Ⅰ) --光伏屋顶热性能的调查 总被引:3,自引:0,他引:3
为了对综合利用生态能源技术进行研究和发展,上海交大太阳能研究所建造了JD-01号生态能源房.根据在大规模应用中节省建材和施工费及追求建筑美观的意图出发,实验性地开发了太阳能屋顶一体化技术.为了调查太阳电池组件作为建筑模块使用时其背面温度的上升规律及对太阳电池性能的影响,供今后设计类似系统时参考,实际测定和讨论了太阳电池背面温度与太阳辐照度、环境温度的关系,结果表明有自然通风通道的光伏屋顶的温度特性与支架布置型太阳电池方阵基本相同. 相似文献
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太阳能建材技术的研究与开发(I)——光伏屋顶热性能的调查 总被引:3,自引:3,他引:3
为了对综合利用生态能源技术进行研究和发展,上海交大太阳能研究所建造了JD—01号生态能源房。根据在大规模应用中节省建材和施工费及追求建筑美观的意图出发,实验性地开发了太阳能屋顶一体化技术。为了调查太阳电池组件作为建筑模块使用时其背面温度的上升规律及对太阳电池性能的影响,供今后设计类似系统时参考,实际测定和讨论了太阳电池背面温度与太阳辐照度、环境温度的关系,结果表明有自然通风通道的光伏屋顶的温度特性与支架布置型太阳电池方阵基本相同。 相似文献
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该文提出一种新型一体化通风光伏屋顶。为优化该屋顶结构,建立该光伏屋顶的CFD模型,并通过实验验证模型的准确性。基于该CFD模型,探究散热通道高度H和组件间距D对光伏屋顶温度分布的影响。结果表明,增加H和D强化了光伏屋顶散热,有效提高了组件发电效率。综合考虑散热效果和结构可靠性等因素,该光伏屋顶的优化结构参数为H=50 mm,D=100 mm。进一步采用EnergyPlus模拟该光伏屋顶的传热特性和光伏产能特性。结果表明,在西安地区,与普通屋顶相比,新型光伏屋顶夏季得热量和冬季热损失分别降低了48.0%和27.1%,全年建筑节能潜力高达198.0 kWh/m2。 相似文献
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在光伏建筑一体化中,带通风腔的光伏组件主要通过对流和辐射换热向外界进行散热,通风腔的设计不仅影响着组件的温度,而且影响着屋面的热工性能。为此,对带通风腔的光伏屋面进行理论分析和仿真模拟,提出最优方案,使得通风腔光伏建筑更具节能效果和经济性,加快光伏建筑工程化应用。 相似文献
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针对光伏组件表面温度影响光伏电站出力的技术难题,以2行4列的光伏阵列为例,在拉萨搭建光伏阵列输出功率实验测试平台,采用液冷方式在背板铺设冷却循环管道构建背板冷却系统,并基于冷却系统的连续运行(实验Ⅰ)、先停后启(实验Ⅱ)、先启后停(实验Ⅲ)3种运行工况,分别进行光伏组件有无背板冷却的对比实验,探究高原高寒地区组件表面温度对光伏阵列输出功率的影响规律。研究表明:采用背板冷却技术降低光伏组件的表面温度,可有效提升光伏阵列的输出功率,在实验Ⅰ、Ⅱ、Ⅲ中光伏阵列输出功率分别提升了1.4%、1.3%、1.0%;光伏组件采用背板冷却技术时,冷却介质循环泵耗功高于光伏阵列提升的输出功率,但在高原高寒地区可回收利用冷却介质吸热量,加热生活用水,可使采用背板冷却的光伏阵列综合效益提高。 相似文献
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Earle Wilson 《Renewable Energy》2009,34(6):1655-1660
This paper presents the results of the impact of a gravity-fed cooling technique applied to a photovoltaic module. The experiment shows that the technique increases the power output of the module by reversing the negative effects of elevated cell temperature on open circuit voltage, and this without the use of a circulating pump. The cooling technique employs the hydraulic head of water from an upstream source as the driving force that passes water over the back of the module, and this keeps the module temperature constant. The experimental results and the results of mathematical model on which it is predicated on are in very close agreement. 相似文献
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通过在光伏组件的背面连接了一个热电转换模块,形成一个光伏一热电混合模块,从而将光伏组件工作过程中产生的废热转换成电能的同时又降低了光伏组件的温度,进而提高了光电转换效率。将光伏一热电模块与百叶有效结合,从而实现了室内采光、通风及节约空间等多种功能。同时,为了提高光伏组件的入射太阳辐射,引入了可调节的抛物型双面聚焦板,减少了太阳能电池板的面积,从而减少了太阳能发电的成本。 相似文献
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Majed M. Alhazmy 《Energy》2011,36(8):5225-5232
Improving the performance of Multi Stage Flash (MSF) desalination plants is a major objective in the seawater desalination industry. Fresh water production rates from MSF plants depend on the evaporation range defined as the difference between the top brine temperature (TBT) and the bottom stage temperature. Lowering the temperature of the plant bottom stage elongates the evaporation range and increases the yield. A modified multi stage flash plant with brine mixing and cooling (MSF-MC) is presented in this paper. Part of the brine leaving the plant is mixed with fresh seawater feed then cooled to low temperature before it enters the bottom stage feed heater. This MSF-MC features several advantages such as expanded evaporation range at the conventional TBT levels, reduced feed pumping power, moderate levels of chemical treatment requirements and fixed fresh water production rates independent of seasonal seawater conditions. Operating with low feed mass fraction minimizes the cooling load and reduces the cooler size. An improvement in the yield by 1.18%-1.4% for every 1 °C reduction in the plant bottom temperature can be achieved with MSF-MC compared to conventional MSF systems. 相似文献
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针对大空间建筑模型进行喷淋效果实验,通过实验得到以下结论:由于Low-E玻璃材料在夏季具有较强的温室效应,未喷淋时,屋顶内表面平均温度为56.8℃,与环境平均温差为21.9℃,增加了空调的能耗。彩钢板屋顶具有较好的保温性能,未喷淋时,屋顶内表面平均温度为40.6℃,模型内部空间平均温度为38.9℃,该温度远低于Low-E玻璃模型温度,能耗比Low-E玻璃模型小。喷淋时,Low-E内层温度比外层温度低约5.4℃;彩钢板内外层温度在喷淋时两者相差不大,仅为0.5℃,喷淋对Low-E玻璃屋顶空调节能意义明显。 相似文献
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Takeharu Yamawaki Seishiro Mizukami Akifumi Yamazaki Haruo Takahashi 《Solar Energy Materials & Solar Cells》1997,47(1-4)
The thermal recovery effect from the light-induced degradation under the sunlight is experimentally investigated on the amorphous silicon photovoltaic module (a-Si PV module) for installing directly to the roof flames of wooden houses. To enhance the recovery effect, the heat-insulating material is attached to the back side of the module for increasing the module temperature under the sunlight: the heat-insulated module.The generated power from the heat-insulated module is compared with that from the normal module (without the heat-insulating material) for 2 yr, and it has been cleared that the generated power normalized at 25°C from the heat-insulated module is approximately 7.3% higher than that from the normal one with the average temperature increase of 4.2°C under the sunlight. 相似文献
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Li Zhu Robert F BoehmYiping Wang Christopher HalfordYong Sun 《Solar Energy Materials & Solar Cells》2011,95(2):538-545
Temperature control of solar cells at high concentrations is a key issue. Short-term efficiency drop and long-term degradation should be avoided by effective cooling methods. Liquid immersion cooling eliminates the contact thermal resistance of back cooling and should improve cell performance. A 250X dish concentrator with two-axis tracking was utilized to evaluate a new CPV system using de-ionized water for immersion cooling. Time-dependent temperature distributions of the PV module of high power back point-contact cells were measured, as well as the I-V curves. The cooling capacities of the liquid immersion approach are very favorable. The module temperature can be cooled to 45 °C at a 940 W/m2 direct normal irradiance, 17 °C ambient temperature and 30 °C water inlet temperature. The temperature distribution of the module is quite uniform, but the electrical performance of the cell module degrades after a fairly long time immersion in the de-ionized water. 相似文献