IIR document

Simulation of R1234yf performance in a typical automotive system.


Simulations are conducted using R1234yf (2,3,3,3-tetrafluoropropene; CF3CF= CH2) in a typical baseline R134a small-size European automotive air-conditioning system, where the baseline R134a system has a nominal cooling capacity of 5.8 kW at a compressor volumetric flow rate of 7.8 m3/h. If R1234yf is used as a drop-in replacement in this baseline system, its cooling capacity is 2.0% lower than the R134a value, and its COP is 1.0% lower than the R134a value. If on the other hand, the two systems are compared at equal cooling capacities, the COP values of the R1234yf system are 0 to 4% lower than the R134a values over operating conditions from idle to highway speeds. While both systems would benefit from the use of a liquid-line/suction-line heat exchanger, R1234yf would benefit somewhat more from its use than would R134a. Also, R1234yf could benefit from the optimization of the heat exchanger circuitries. The thermodynamic and transport properties of R1234yf are estimated from Brown et al. (2009a). The simulation results and analyses presented in this paper demonstrate the attractiveness of R1234yf as a potential replacement for R134a in automotive applications.

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Pages: 2009-5


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  • Original title: Simulation of R1234yf performance in a typical automotive system.
  • Record ID : 2009-2150
  • Languages: English
  • Source: 3rd Conference on Thermophysical Properties and Transfer Processes of Refrigerants
  • Publication date: 2009/06/23


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