Influence of ambient temperatures on performance of a CO2 heat pump water heating system

Ryohei Yokoyama, Takeshi Shimizu, Koichi Ito and Kazuhisa Takemura

Energy, 2007, vol. 32, issue 4, 388-398

Abstract: In residential applications, an air-to-water CO2 heat pump is used in combination with a domestic hot water storage tank, and the performance of this system is affected significantly not only by instantaneous ambient air and city water temperatures but also by hourly changes of domestic hot water consumption and temperature distribution in the storage tank. In this paper, the performance of a CO2 heat pump water heating system is analyzed by numerical simulation. A simulation model is created based on thermodynamic equations, and the values of model parameters are estimated based on measured data for existing devices. The calculated performance is compared with the measured one, and the simulation model is validated. The system performance is clarified in consideration of seasonal changes of ambient air and city water temperatures.

Keywords: Heat pump; Refrigerant; CO2; Thermal storage; System performance; Thermodynamics; Cycle analysis; Numerical simulation (search for similar items in EconPapers)
Date: 2007
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (18)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:32:y:2007:i:4:p:388-398

DOI: 10.1016/j.energy.2006.06.020

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