Thermodynamic Analysis on Heat Pump Water Heater System Using R744/R1270 Binary Mixtures as Refrigerant
FAN Xiao-wei
ZHENG Hui-yan
ZHANG Hong-lin
JU Fu-jun
Abstract：In this paper,the mixtures of carbon dioxide (R744)and propylene (R1270)are chosen as working fluid used in heat pump water heater system.Under the nominal working condition of heat pump sys-tem in China,the system performance is analyzed theoretically.The calculation results illustrate that there ex-ists a maximum heating coefficient of performance (COPh )when the mass fraction of R744/R1270 is 16/84 which is defined as optimum mass fraction.In the same assumptions and working conditions,the maximum COPh of heat pump system with the mixture will increase 9.63% compared with the common refrigerant R22. Unit volumetric heating capacity and discharged pressure are higher than those of R22 system,but the com-pressor ratio and discharge temperature are lower.Efficiency of compressor has a significant effect on the COPh .
Keywords：heat pump water heaterR744/R1270heat transfer pinch pointisentropic efficiency
Publication Date：2016-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 59-63 )