In order to apply the user defined compressor model to the air-conditioner system simulation software and to protect the product data

a product-data interactive theoretical model of variable-speed compressor is developed. The model transforms the compressor theoretical model to the form that can be fitted directly by the product data. The linear mass flow rate equation is derived by linearizing the frequency item in the theoretical model using interpolation method

and the non-linear power equation is solved by least error method. For security concerns

the product data is defined as private functions with corresponding interface functions

and then packaged by the dynamic link library. The results show that the developed model is capable of predicting compressor performance

and the maximum error is less than ±5%. The developed compressor model can be applied to system simulation and the product data is well protected.