# Establish a mathematical model of the automobile air-conditioning system

The heat exchanger model library uses this model library, and the user enters the parameters (including the use code of the heat exchanger, the type of the heat exchanger, the structural parameters of the heat exchanger, the material parameters, and the evaporator under the prompts of the software interface of the heat exchanger. After the inlet air volume or the front wind speed of the condenser, the dry and wet bulb temperature of the inlet air, the type of refrigerant, the flow rate of the refrigerant, and the temperature and pressure of the refrigerant at the inlet), calculate the heat exchanger in a given working condition Performance (including the heat transfer of the condenser, the cooling capacity of the evaporator, the pressure drop on the air side and the inside of the tube, and the temperature and pressure of the refrigerant at the outlet); the model library can also calculate the heat exchanger structure separately Changes in parameters, changes in the wind speed or volume of the air at the inlet of the heat exchanger, and changes in the performance of the heat exchanger when the temperature of the air at the inlet of the heat exchanger changes are reflected in the form of a curve. The model library can be used to calculate the relationship curve between the opening and flow of various types of H-type expansion valves and externally balanced expansion valves, providing a reference for users to select expansion valves reasonably.

Liquid storage tank model library Calling this model library can calculate the volume and flow resistance of various types of liquid storage tanks. Provide a reference basis for users to reasonably select liquid storage tanks. The air conditioning system model library reasonably selects the automobile air conditioning refrigeration system based on the heat load value calculated by the heat load model library, the allowable installation space location of the car, and the existing component products, and then establishes the mathematical model of the automobile air conditioning system. The following functions can be realized by using this model library: simulation simulation calculation of simulation bench test; calculation of multiple operation modes can be carried out. It can calculate the known refrigerant charge or the required refrigeration capacity; calculation of multiple connection methods; for a given automobile air-conditioning refrigeration system, the compressor speed, the condenser inlet air temperature or the oncoming Under the conditions of wind speed, variable evaporator inlet air temperature or air volume, the performance of the automobile air-conditioning refrigeration system (such as cooling capacity, power consumption, coefficient of performance, evaporator outlet air temperature, compression ratio, compressor suction temperature and The influence law of pressure, exhaust temperature and pressure) is expressed in the form of curves, so as to provide a reference basis for predicting the matching rationality and working conditions of the automobile air conditioning system. For automotive parts and parts machining, PTJ Shop offers the highest degree of OEM service with a basis of 10+ years experience serving the automotive industry. Our automotive precision shop and experts deliver confidence. We have perfected the art of producing large component volumes with complete JIT reliability, backed by the quality and long-term reliability our customers expect.