Based on Peng-Robinson general state equation

combined with group contribution principle and a polynomial method

the thermal state model of the new LGWP refrigerant HFO-1234yf was established and validated with required accuracy. By using the computer programming

the state models were solved by a mathematic software and a complete thermal properties of refrigerant were obtained. The thermal properties of HFO-1234yf were compared with R417A and R134a

and the results showed that the saturated vapor pressure and the specific heat capacity under constant pressure of HFO-1234yf has a similar performance with R134a. Both The saturated vapor pressure of both HFO-1234yf and R134a are lower than R417A

and the saturated state enthalpy of HFO-1234yf is lower than R417A

which would lead that the HFO-1234yf system can not have a higher performance coefficient. The models could act as a theoretical basis for the application of HFO-1234yf in automotive air conditioning and fixed refrigeration equipment.