Abstract
Due to the urgent need for environmentally benign refrigerants,
the use of the natural substance carbon dioxide in refrigeration
systems has gained more and more attention. In systems such as
automobile air-conditioners and heat pumps, owing to the
relatively high heat rejection temperatures, the cycles using
carbon dioxide as refrigerant will have to operate in the
transcritical area. In a transcritical carbon dioxide system,
there is an optimal heat rejection pressure that gives a maximum
COP. In this paper, it is shown that the value of this optimal
heat rejection pressure mainly depends on the outlet temperature
of the gas cooler, the evaporation temperature and the efficiency
of the compressor. General correlations for this optimal heat
rejection pressure were derived based on cycle simulations. The
correlations presented in this paper provide a basis for designing
transcritical carbon dioxide air conditioning or heat pump systems
and for intelligent controlling such systems.
Original language | English |
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Title of host publication | Optimal heat rejection pressure in transcritical carbon dioxide air conditioning and heat pump systems |
Publication date | 1998 |
Publication status | Published - 1998 |
Event | Natural Working Fluids '98 - Oslo, Norway Duration: 1 Jan 1998 → … |
Conference
Conference | Natural Working Fluids '98 |
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City | Oslo, Norway |
Period | 01/01/1998 → … |