Transcritical CO2 heat pump prototype development for simultaneous water cooling and heating

published Sep 23, 2008 - 8 pages

In the present investigation, a transcritical CO2 heat pump system for simultaneous water cooling and heating
was designed and a prototype for 1 ton cooling capacity was developed. Fabrication procedure, test facility
and test procedure have been reported in this article. System behaviour and performance have been studied
experimentally for various operating conditions. Performances of compressor, gas cooler and evaporator
have been studied individually. Finally, the

In the present investigation, a transcritical CO2 heat pump system for simultaneous water cooling and heating
was designed and a prototype for 1 ton cooling capacity was developed. Fabrication procedure, test facility
and test procedure have been reported in this article. System behaviour and performance have been studied
experimentally for various operating conditions. Performances of compressor, gas cooler and evaporator
have been studied individually. Finally, the technique for optimum discharge pressure setting of the system
by varying working fluid mass charge has been demonstrated. Uncertainty analyses show reasonably
acceptable results. Transient study shows that the system took about 15 minutes to attain steady state. Study
on the system behaviour with varying expansion valve opening shows that the valve opening has significant
effect near the full valve closing condition. Performance study with varying compressor discharge pressure
shows both the cooling and heating outputs to increase with discharge pressure due to increase in refrigerant
mass flow rate. Individual component performances exhibit good agreement with design data.


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