Research On Performance Of Photovoltaic Loop Heat Pipe-Air Source Heat Pump Hot Water System

The paper studies a hot water system combined with a photovoltaic loop heat pipe and an air source heat pump,both of which are effectively complementary.Photovoltaic loop heat pipe can supply power for air source heat pump operation,and the air source heat pump can supplement the heat of the photovoltaic loop when the heat pipe is insufficiently heated.The system has high solar energy utilization efficiency,namely it can not only provide domestic hot water for buildings,but also can solve part of the electricity supply,which is conducive to the realization of building energy-saving emission reduction targets.In the paper,a detailed study of the system has been conducted through a combination of numerical simulations and experiments.And the simulation analyses the long-term operating performance of the system and the impact of the control strategy,thus discussing the social and economic benefits of the system and establishing an experimental platform verifies the accuracy of the model and algorithm.The research of the paper contains the following aspects:First,through the establishment of a mathematical calculation model for the operation mode of the photovoltaic loop heat pipe,based on the climatic conditions in Shenyang,the characteristics of the system's annual operating performance change were discussed from the layers of water supply temperature,photoelectric efficiency,photoelectric power,photothermal efficiency,etc.And establish a mathematical model of the air source heat pump operation mode,simulate and analyze its operating performance and annual comprehendsive efficiency.By using TRNSYS simulation software,detailed comparisons are made between the performance of the loop heat pipe and the traditional vacuum tube solar water heating system so as to verify the system's comprehensive application of solar photovoltaic thermal performance.In addition,the paper studies the effects of different control strategies on the operation mode of the heat pipe of the photovoltaic loop,the operation mode of the air source heat pump and the comprehensive operating performance of the system.And the result shows that when the operating systems are switched at 16 o'clock can achieve the better performance in Shenyang.Based on the optimized operation strategy,the paper differentiate selects the solar air source heat pump hot water system and the traditional air source heat pump hot water system to further explore the social and economic benefits of the system,including energy efficiency,environmental benefits and economic benefits.Finally,outdoor test is conducted to verify the cooling effect of the loop heat pipe on the PV modules.And also experimental data and simulation result are compared to analyze and verify the accuracy of mathematical models and calculation programs.