Simulation of the Working Process of an Oil Flooded Helical Screw Compressor with Liquid Refrigerant Injection

In this paper a mathematical model for the working process of a refriceration helical screw compressor is presented and discussed. The manner in which geometric parameters such as cell volume, sealing line length, blow hole are..,, discharge port area etc. a.re related to rotation angle is established a.nd used in the thermodynamic model which is based on real cas laws. The influence of factors such as the Mgree of oil flooding, liquid refrigerant injection, vapour charge from the economizer, different refrigerants and partial loading etc., are considered simultaneously and separately in the model. The theoretical basis of the program is described in the paper. Moreover in order to confirm the computer model the performance predicted by it is compared with the results from compressor tests. The results are compa.red for different operating conditions.