Title :
Preliminary analysis and performance of a trans-critical CO2 heat pump
Author :
Maina, Paul ; Huan, Zhongjie
Author_Institution :
Dept. of Mech. Eng., Tshwane Univ. of Technol., Pretoria, South Africa
Abstract :
A CO2 trans-critical water to water test bed was developed to study the output of a typical heat pump using. A data acquisition system was used to collect, store and reflect measurement from temperature, pressure and flow-rate sensors of the system. NIST REFPROP software was used to evaluate the thermophysical properties. A temperature-entropy diagram was used to present the output of a preliminary investigation of the system. Typical efficiency results in terms of coefficient of performance for the heat pump were varying from 3.7 to 3.9. These efficiencies were related to heat rejection values varying from 10.9 to 11.8 kW.
Keywords :
carbon compounds; entropy; flow sensors; heat pumps; pressure measurement; temperature measurement; NIST REFPROP software; flow-rate sensors; heat pump; heat rejection values; performance coefficient; power 10.9 kW to 11.8 kW; preliminary analysis; temperature-entropy diagram; thermophysical properties; trans-critical performance; trans-critical water; water test bed; Fluids; Heat pumps; Hybrid fiber coaxial cables; Refrigerants; Temperature; Water heating; Carbon dioxide; Coefficient of performance; Heat pump; Heating capacity; Trans-critical cycle;
Conference_Titel :
Industrial and Commercial Use of Energy Conference (ICUE), 2012 Proceedings of the 9th
Conference_Location :
Stellenbosch
Print_ISBN :
978-1-4673-1241-7
