基于微热管阵列的新型光伏热电系统性能研究

Performance of a novel photovoltaic-thermoelectric system based on micro-channel heat pipe array

带微热管的光伏热电系统用在实际建筑中时,全年运行过程中会出现热电模块的冷热端不断变换时热量损失与浪费的情况。为解决这一问题,本文提出了一种利用三通阀切换热流方向的微热管,并比较了按时刻和按季节切换三通阀方向的2种模式。基于Simulink软件建立了该新型光伏热电系统的数值模型,根据全年运行过程中室内外温度变化不断切换三通阀方向来分析系统性能,同时与普通光伏热电系统进行了比较,结果表明,按时刻切换三通阀微热管的系统效率更高,可达18.75%。

In the actual application of the photovoltaic-thermoelectric system with micro-channel heat pipe in buildings,the heat loss and waste will occur when the hot and cold ends of the thermoelectric devices constantly change during the whole year's operation.In order to solve this problem,this paper proposes a kind of micro-channel heat pipe which uses a three-way valve to switch the direction of heat flow,and compares two modes of changing the direction of three-way valve by time and by season.Based on the Simulink software,a numerical model of the new type of photovoltaic-thermoelectric system is established.The system performance is analysed by changing the direction of three-way valve continuously according to the annual indoor and outdoor temperature,and is compared with the traditional photovoltaic-thermoelectric system at the same time.The results show that the system efficiency of changing the three-way valve by time is higher,reaching 18.75%.