Theoretical And Experimental Research On The Performance Of Photovoltaic Direct Drive Air Conditioning System

As one of the most potential renewable energy sources,solar energy has attracted attention from all walks of life owing to its wide distribution,huge quantity,cleanness and safety,etc.Since the beginning of the 21 st century,photovoltaic power generation technology has been developing rapidly in our country,the annual installed capacity has continued to increase,and the cost of photovoltaic modules has also been gradually reduced.At the same time,people are gradually paying attention to the energy consumption of air-conditioning systems.The development of solar energy technology and the demand for energy saving and emission reduction from all walks of life have prompted the emergence of photovoltaic air conditioning systems.The article builds a set of 24 V photovoltaic direct drive air conditioning experimental system,through experiments to explore the operating conditions of the system in Chongqing in winter and summer,and uses TRNSYS software to carry out the application prospects of photovoltaic systems and photovoltaic thermal systems in different regions The analysis aims to provide theoretical and practical application references for the design and use of photovoltaic air conditioning systems.The specific work is as follows:First of all,this paper designs a set of photovoltaic direct drive air conditioning system with a voltage of 24 V,it consists of a DC air conditioner with a rated power of750 W,two batteries with a capacity of 150 AH,eight photovoltaic panels with a maximum power of 300 W,and corresponding controllers and inverters The system has three operating modes: photovoltaic panel and battery combined power supply,battery alone power supply and photovoltaic panel alone power supply to cope with different weather conditions.At the same time,an experimental platform was built in Chongqing,including a set of test systems that can automatically record and save data such as current,voltage,and temperature.It also introduces the relevant indicators of the system evaluation in detail in order to conduct an objective and accurate performance evaluation of the system.Secondly,this paper conducts an experimental study on the system performance.The system has good heating and cooling performance in Chongqing area,whether it is the photovoltaic panel and battery combined power supply mode or the battery alone power supply mode,the indoor temperature remains in a stable state.Among them,in the combined supply mode,the COPs of cooling and heating are 0.49 and 0.46,respectively;in the battery power supply mode,the COPs of cooling and heating are 0.59 and 0.55,respectively.When the system is running with a household air conditioner driven by AC power,there is a 32.55% energy loss through the inverter.Through comparison and analysis of the data,it is found that the COP of the DC side is increased by 41.03%compared with the AC side.The highest photoelectric conversion efficiency of the photovoltaic panels used in this system is 17.42%.Furthermore,this paper uses TRNSYS software to construct a simulation model of a photovoltaic direct drive air conditioning system.Through comparison,the maximum error between the simulated data and the experimental data is 6.36%.It is found that the annual power generation of the system is 1821.93 k W·h.Evaluate the economy and environmental protection of the system through calculations.Finally,this paper optimized the design of the system and built an optimized system model.In order to use the heat from the photovoltaic panels,the original photovoltaic panels were replaced with photovoltaic thermal panels,and supporting facilities such as hot water storage tanks and water pumps were added.Through the annual data analysis in Chongqing area,the feasibility of using the heat from the photovoltaic panel is determined by the photovoltaic direct drive air-conditioning system.According to the division of solar energy resources,this paper determines the four regions of Lhasa,Kunming,Nanjing,and Sanya to conduct annual analysis and comparison of typical areas of the system.At the same time,the installation power of PV panel before and after optimization is also optimized,which provides a theoretical basis for the design and use of the system.