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.

sensitivity analysis

non-azeotropic mixtures

equation of state comparisons

cycle performance estimations

heat pump

Författare

Marine Högberg

Institutionen för värmeteknik och maskinlära

Lennart Vamling

Institutionen för värmeteknik och maskinlära

International Journal of Refrigeration

Vol. 19 1 34-42

Ämneskategorier

Kemiska processer

DOI

10.1016/0140-7007(95)00064-X