太阳能PV/T光储直驱热电联产系统性能

Performance analysis of solar PV/T photovoltaic energy storage direct drive CHP system

面对居民日益增长的生活热水和电能需求,光伏/光热(photovoltaic/thermal,PV/T)技术的应用可以降低建筑运行时的能源消耗。本文介绍了一种太阳能PV/T光储直驱热电联产(combined heat and power,CHP)系统,为了减少系统运行过程中的能量损失,采用直流压缩机和储能电池,并在兰州地区对系统的运行性能开展了实验测试。研究结果表明,PV/T系统的光伏板温度相比传统PV组件温度平均降低12.26℃,平均发电效率相对提升8.1%。在将24.4~27.2℃的水加热到50.1~50.7℃的过程中,平均性能系数(coefficient of performance,COP)可达到5.48,相比传统空气源热泵热水器提高82.1%~106.8%。平均集热效率和综合效率分别为37.30%和71.24%,PV/T系统的发电量和耗电量分别为3.33kWh和1.69kWh,发电量相比PV系统提高5.7%。太阳能PV/T光储直驱热电联产系统可以减少建筑部门的能源消耗,并提升PV/T系统的发电效率和综合效率,在晴天条件下可以实现离网运行。

In the face of the growing domestic hot water and electric energy demand of residents,the application of PV/T technology can reduce the energy consumption during building operation.In this paper,a solar PV/T photovoltaic energy storage direct drive CHP system was introduced.In order to reduce energy loss during system operation,direct current compressor and energy storage battery were used,and the operation performance of the system was tested in Lanzhou.The results showed that the PV panel temperature of the PV/T system was on average 12.26℃lower than that of the traditional PV module,and the average power generation efficiency was relatively increased by 8.1%.In the process of heating water from 24.4—27.2℃to 50.1—50.7℃,the average COP could reach 5.48,which was 82.1%to 106.8%higher than that of the traditional air source heat pump water heater.The average heat collection efficiency and comprehensive efficiency were 37.30%and 71.24%respectively,the power generation and consumption of the PV/T system were 3.33kWh and 1.69kWh respectively,and the power generation was 5.7%higher than that of PV system.In general,solar PV/T photovoltaic energy storage direct drive CHP system could decrease energy consumption of the construction sector,improved the power generation efficiency and comprehensive efficiency of the PV/T system,and realized off grid operation under sunny conditions.