| As energy shortages and environmental pollution intensify,the use of solar energy has received increasing attention from countries.Compared with photovoltaic modules and flat-plate collectors that simply use solar energy,solar photovoltaic/thermal(PV/T)collectors are a type of working fluid(water,air or refrigerant)to absorb and perform photovoltaic light and heat comprehensive utilization.When solar radiation is insufficient,the hot water produced by ordinary PV/T collectors can’t meet the water temperature requirements of domestic hot water.The heat pump system can use the low-temperature hot water produced by the PV/T collector to obtain high-temperature hot water above 50 ~oC.At the same time,the heat pump evaporator always absorbs the heat of the working medium in the flow channel,so that the photovoltaic cell maintains a low temperature and improves the power generation efficiency to achieve efficient use of solar energy and energy conservation and emission reduction.From the perspective of improving the overall efficiency of thermoelectricity and the coefficient of performance of the heat pump,this paper uses a combination of heat transfer simulation analysis and experimental testing to study and analyze different types of PV/T collectors and hot water systems coupled with heat pumps.PV/T collector and PV/T heat pump system design application provides a reference.The main research work of this article includes the following parts:1.Based on the theory of the energy replacement process,a three-dimensional dynamic model of four types of equipment with and without cover plate PV/T collectors,traditional photovoltaic modules and flat plate collectors was established,and experiments were performed on the models.Validation,the error is 2.8%,indicating that the results are reliable.At the same time,the performance differences of these four types of solar energy utilization equipment are analyzed to provide a theoretical basis for component selection performance.2.Designed a micro-channel blow-up plate PV/T collector without a cover plate,made a tube-plate PV/T collector and a blow-up plate PV/T collector,and built a PV/T.Heater hot water experimental platform,researching the thermoelectric performance indicators of two PV/T collectors and traditional photovoltaic modules,and analyzing the influence of inclination angle and flow rate on the comprehensive efficiency The performance is 11%higher than the ordinary type,which provides experimental support for the design.3.Designed and built an indirect PV/T heat pump system in which an expanded plate PV/T collector and a heat pump system are coupled.Experimental studies of this PV/T heat pump and air source heat pump were conducted in winter and summer.The results show that the coefficient of performance(COP)of the PV/T heat pump is 40%higher than that of the air source heat pump in winter,and it can generate electricity,which fully meets the power consumption of the heat pump.4.Using the solar radiation model,the degree of matching between the area of the PV/T collector and the heat pump parameters in the PV/T heat pump system was analyzed,and the PV/T Heating capacity and heat pump power provide reasonable suggestions for improving the performance of PV/T heat pumps. |
PDF Full Text Request