Impact of uncertainties on estimations of heat pump cycle performance
Artikel i vetenskaplig tidskrift, 1996
Sensitivity analysis is used to show how uncertainties in basic factors, such as heat transfer, pressure drop,
compressor efficiency, and thermophysical properties, influence the result of heat pump cycle performance
estimations. By comparing the results of this analysis with uncertainty levels of estimations and experimental determinations, it is established to what extent improvements in accuracy are needed. The investigation was carried out for several different applications and, as working fluids, both pure substances and non-azeotropic mixtures were examined. It was found that evaporation heat transfer and compressor efficiency are two areas where improvements are needed. It is also shown that estimates using very accurate, substance-specific, equations of state differ from those using more general types by up to 1 % for COP and 2% for capacity.
equation of state comparisons
cycle performance estimations