Theoretical performance analysis of heat pump water heaters using carbon dioxide as refrigerant
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Publication Details
Author list: Laipradit P., Tiansuwan J., Kiatsiriroat T., Aye L.
Publisher: Wiley
Publication year: 2008
Journal: International Journal of Energy Research (0363-907X)
Volume number: 32
Issue number: 4
Start page: 356
End page: 366
Number of pages: 11
ISSN: 0363-907X
eISSN: 1099-114X
Languages: English-Great Britain (EN-GB)
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Abstract
The aim of this paper is to simulate the performance of an air source heat pump water heater using carbon dioxide (CO2) as a working fluid. The heat pump water heating system consists of a compressor, a gas cooler, an expansion device and an evaporator. The computer simulation model has been developed by using the heat transfer data and the thermodynamic properties Of CO2. The effects on the heat pump performance by the operating parameters such as the compressor rotational speed, the inlet water temperature at the gas cooler, the inlet air temperature at the evaporator and the mass flow rate ratio of water to refrigerant were presented. For rated capacities of a 4 kW compressor with a 10 kW gas cooler and a 6 kW evaporator, the coefficient of performance is found to be between 2.0 and 3.0. The mass flow rate ratio of water and CO2 between 1.2 and 2.2 is the most suitable value for generating hot water temperature above 60ฐC at 15-25ฐC ambient air temperature. Copyright ฉ 2007 John Wiley & Sons, Ltd.
Keywords
Computer simulation, Heat pump
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