水冷型PV系统和PV—SAHP系统的火用分析.docVIP

水冷型PV系统和PV—SAHP系统的火用分析 马飞，魏兵（华北电力大学 动力工程系） 摘要：水冷型PV系统和PV—SAHP系统都属于光伏光热一体化系统，即在利用太阳能发电的同时提供热水。在水冷型PV系统中，用流体带走光伏电池温升产生的热量，降低电池温度以提高发电效率，同时产生的热水也可以加以利用。PV—SAHP系统是指将光伏转换与热泵循环有机结合在一起形成的系统。热泵的蒸发工质作为PV板的冷却流体，得到的热量通过热泵循环在冷凝端以高温输出，既降低了电池板的温度同时也可以输出较高温度的热水。由于两者的设备装置和所处的环境条件的差别，导致两者在能量的利用效率上有所不同。而火用分析可以找出损失或损耗的原因以及能量利用上的薄弱环节，为节能降耗，提高能量利用率指明正确的方向。本文利用火用分析对两种系统在能量的利用和损失方面作分析，并得出两种系统的火用效率，对今后的系统优化提供一定的参考。 关键词：火用分析；水冷型PV系统；PV—SAHP系统 Exergy Analysis of PV-Water Cooling System and PV-SAHP System Ma Fei ,Wei Bing (School of Energy Power Engineering, North China Electric Power University) Abstract：PV-water cooling system and PV-SAHP System are the integration of solar photovoltaic systems and thermal utilization system, which use the solar energy to supply the electric power and space heating or daily hot water. In PV-water cooling system the release heat of the photovoltaic cells is cooled by water, the temperature of the panels is lowered down and power generation efficiency is increased, while space heating or daily hot water is supplied synchronously. PV-SAHP (photovoltaic – solar assisted heat pump) system is a system that combines photovoltaic conversion with heat pump, where the refrigerant in the heat pump is used as the cooling fluid of the PV panels. Because of the differences of equipment installations and application conditions, two systems are different from their system efficiencies. To analyze the system exergy is of great significance, for the energy loss and utilization deficiency can be identified through the exergy analysis. And further more the system efficiency can be improved, and the system can optimize. In this paper the exergy analysis of two systems is carried through, the energy loss and utilization deficiency of both are analyzed, and the exergy efficiencies will be obtained. The work will be good references for the application and optimization of solar photovoltaic systems and building thermal utilization system. Keywords: exergy analysis; PV-water-cooli