Impact of Refrigerant Property Uncertainties on Prediction of Vapor Compression Cycle Performance

摘要

The paper presents a sensitivity study of a vapor compression cycle in the form of a heat pump operating in the cooling mode. The study was performed with the aid of a detailed heat pump computer model; simulation runs were made for different parametric values and the capacity and power input were compared with results of a run using an unchanged value of the parameters. The effects on evaporator and condenser pressures, and refrigerant mass flow rate are given. The independent variables (parameters) include thermodynamic and transport properties, as well as the refrigerant flow heat transfer and pressure drop coefficients. When considering the state-of-the-art limits of the individual parameter uncertainties, those which had the most effect on system performance were liquid transport properties, evaporative heat transfer coefficient and vapor density.