Research On The Performance Of Solar Ejector Refrigeration System With Heat Pipe Solar Collector

Along with the pollution of environment and energy crisis intensifies,the use of clean energy has been paid more and more attention.The combination of solar energy and residential construction become the focus of academic research.In the utilization of solar energy technology,the solar-assisted ejector refrigeration system has been used popular for its simple structure,fewer moving parts and low cost.However,the solar ejector refrigeration system has a strong dependence on solar radiation,the solar collector system has a significant impact on the performance of the eject refrigeration system.In order to further improve the utilization of solar energy,this paper adopts the method of thermodynamic calculation and experimental research to study the coupling between solar collector and ejector refrigeration system.The main research works are as follows:First,based on thermodynamic analysis,the exergy loss calculation formulas of solar ejector refrigeration system components were derived,the exergy loss of solar ejector refrigeration system components were calculated.The results show that,the exergy loss of solar collector is the largest,accounting for 74% ~ 79% of the system exergy loss.The ratio of the ejector is second,which accounts for 10% of the total exergy loss,the ratio of the generator increases from 3.24% to 10.96%.The ratio of evaporator,condenser and refrigerant pump are all 1.5%,the proportion of the throttle is the smallest,accounting for about 0.4% of the system exergy loss.Second,the heat pipe solar collector experimental system was built,the influence of the tank volume and circulating flow rate on the solar collector performance was analyzed.The results showed that: the tank water temperature increase first and then decline by the time sequence,when the volume of the heat storage tank is 200 L,the rises of the tank water temperature can arrive the largest,the maximum temperature rises can arrive at 85?.When the volume of the heat storage tank are 200 L,400L,600 L and the circulating flow are 10L/min,13L/min,15L/min respectively,the temperature rises are the largest.The instantaneous effciency of solar collector system fluctuates up and down in a certain range,the amplitude of the fluctuations depends on the solar radiation,with the increase of circulation flow rate,the instantaneous effciency increases gradually.When the volume of the heat storage tank are 200 L,400L,600 L and the circulating flow are 8L/min,13L/min,15L/min,the average instantaneous efficiency are the largest,the maximum value are 60.1%,63.5%,74% respectively.Finally,based on the experiment research and the solar eject refrigeration system calculation program established early by our research group,the integrated efficiency and refrigeration capacity of the eject refrigerant system were studied with the difference solar collector parameters.The results show that when the volume of the heat storage tank is 200 L and the circulating flow is 10L/min,the maximum value of COP is 0.22.When the volume of the heat storage tank is 400 L and the circulating flow is 13L/min,the maximum value of refrigeration capacity is 22 MJ.