Theoretical Research On Quasi-two-stage Compression Heat Pump Air-conditioning System Based On Economizer Optimization Design

The development of step-by-step tools has accelerated the rapid expansion of the energy crisis.It is necessary to find new energy sources.The pure electric vehicle uses the battery as the power source of energy storage,which provides electric energy to the motor through the battery to drive the motor to run.In the auxiliary equipment of electric vehicle,the energy consumption of automobile air conditioning is the largest.It is very important to design and develop a stable,energy-saving and efficient heat pump air conditioning system.The economy of the quasi-secondary compression heat pump system has become a research hot spot.In this paper,the experimental refrigerant R410 A,the use of p-h graph on the ordinary heat pump air conditioning system and rehydration heat pump air conditioning system for comparative analysis,the required state parameters are determined by using relevant software and relevant formulas are used,and the rehydration heat pump air conditioning system for theoretical quantitative calculation and analysis.By changing the parameters such as the filling method,the relative rehydration amount,the evaporation temperature and the condensation temperature,the influence on the system heat,compressor power consumption and heating energy efficiency ratio COP is studied,which lays the foundation for the later research of air supply type air conditioning system.The study found that the heat-producing and compressor consumption is basically the same as the change of evaporation temperature,and at the same evaporation temperature,the COP is higher than the COP when the gas is not replenished;With the increase of relative air supply,the system COP increases first and then decreases.When the relative air supply is 0.25,the system COP reaches a maximum of 4.248.The lower the evaporation temperature,the higher the condensation temperature,the higher the system heat,and the change of evaporation temperature on the system heat is greater than the effect of the change of condensation temperature on the system heat,only increase the evaporation temperature and only reduce the condensation temperature on the system COP effect is about the same.Secondly,this paper simulates the intermediate economizer used in the experiment,selects three important structural parameters of ripple depth,ripple inclination and ripple spacing to study,designs orthogonal scheme,analyzes the simulation results and objective function,finds out the influence of these three main structural parameters on the heat exchange efficiency of the plate heat exchanger and the primary and secondary relationship of the influence,and designs the optimal structural combination to lay the foundation for the future design and manufacture.The study found that the most important factor affecting heat exchange performance is the ripple spacing P,followed by the ripple inclination ?,finally by the ripple depth h;the optimal structure combination that the ripple depth h is 4 mm,the ripple inclination ? is 60 degrees,and the ripple spacing P is 10 mm.