Energetic and exergetic analyses of a transcritical N2O heat pump system

Amol S. Dayma, Neeraj Agrawal and Prasant Nanda

International Journal of Low-Carbon Technologies, 2014, vol. 9, issue 4, 277-283

Abstract: In the present study, energetic and exergetic analyses of a transcritical nitrous oxide (N2O) heat pump cycle are carried out on the basis of the optimization of discharge pressure. A simulation code was developed to study cycle performances for the given design and operating parameters. This code was integrated with the thermodynamic property subroutine ‘N2OPROP’ to estimate the thermodynamic properties of N2O in subcritical and supercritical regions. Variation trends of optimal parameters for an N2O system are similar to those of a CO2 system. However, the N2O cycle exhibits higher cooling COP, lower compressor pressure ratio and lower discharge pressure and temperature, and higher second-law efficiency than those of CO2-based systems. An N2O system is inferior in terms of volumetric cooling capacity compared with a transcritical CO2 system. The maximum exergy loss is observed in the throttle valve (expansion valve) as in the case of a CO2 transcritical system due to low critical temperature.

Date: 2014
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Persistent link: https://EconPapers.repec.org/RePEc:oup:ijlctc:v:9:y:2014:i:4:p:277-283.

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