CPC型聚光光伏光热系统的性能分析

摘要

According to Law of Conservation of Energy, a dynamic model is established to analyze the thermal and electrical performance of a combined parabolic concentrator-photovoltaic/thermal (CPCPV/T) system.The influence of some factors such as the dimension of the CPC-PV/T system, the water mass flow rate and etc., on the performance of CPC-PV/T system are investigated.When the water mass flow rate is constant, the daily electrical and thermal efficiency is decreased along with the increase of the length of the CPC-PV/T system.When the length of the system is constant, the temperature of water is decreased along with the increase of the water mass flow rate, the system electrical efficiency is increased.However,with the increase of the water mass flow rate, the variations in temperature of water and system electrical efficiency are decreased.There is an optimum relationship between the system electrical efficiency and the temperature of water based on the water mass flow rate.%根据能量守恒定律,建立了分析CPC型聚光光伏光热系统性能的动态模型,并研究了系统的结构尺寸、冷却水流量等参数对系统性能的影响.当冷却水流量一定时,随着系统长度的增加,系统日发电效率和系统日集热效率逐渐降低.当系统长度一定时,增加冷却水流量能降低冷却水的出口温度,提高系统的发电效率.但是,随着冷却水流量的逐渐增加,各指标的变化趋势将逐渐平缓,系统的发电效率与水温之间存在一个基于流量的优化关系.