CPL - Chalmers Publication Library
| Utbildning | Forskning | Styrkeområden | Om Chalmers | In English In English Ej inloggad.

Impact of uncertainties on estimations of heat pump cycle performance

Marine Högberg (Institutionen för värmeteknik och maskinlära) ; Lennart Vamling (Institutionen för värmeteknik och maskinlära)
International Journal of Refrigeration Vol. 19 (1996), 1, p. 34-42.
[Artikel, refereegranskad vetenskaplig]

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.

Nyckelord: sensitivity analysis; heat pump; cycle performance estimations; non-azeotropic mixtures; equation of state comparisons



Denna post skapades 2011-12-09. Senast ändrad 2015-02-11.
CPL Pubid: 149863

 

Läs direkt!


Länk till annan sajt (kan kräva inloggning)


Institutioner (Chalmers)

Institutionen för värmeteknik och maskinlära (1949-2002)

Ämnesområden

Kemiska processer

Chalmers infrastruktur