Study on flow path optimization of vapor bypass evaporator for air source heat pump
As a key component of air source heat pumps,the heat exchanger directly affects the performance of the heat pump system.Vapor bypass technique,as a new type of enhanced heat transfer technology,can effectively improve the overall performance of the heat exchanger,thereby enhancing the performance of the heat pump system.Focus on this aspect,the distrib-uted parameter method was used to construct a simulation model for a vapor bypass evaporator.The effects of the relative position of the gas-liquid separator,the number of branches in front of the separator,and the number of branches in back of the separa-tor on the entropy production of the evaporator were studied by simulation.The simulation results show that the entropy generation of the evaporator shows a trend of first increasing and then decreasing with the increase in the position of the gas-liquid separator and the number of branches after the separator.According to the design conditions,the entropy production of the vapor bypass e-vaporator is reduced by 37.46％and 17.89％respectively compared with the conventional evaporator under the optimal position of the gas-liquid separator and the number of shunt after the separator.Additionally,a genetic algorithm was used to construct a global optimization model for the evaporator flow path,using entropy production minimization as the optimization objective.The optimal vapor bypass evaporator flow path corresponding to 3 500～13 500 W has been obtained.The conclusions of this study can pro-vide theoretical support and guidance for the optimization design and promotion of vapor-bypassed air conditioning systems.
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