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

fYear

2012

fDate

15-16 Aug. 2012

Firstpage

1

Lastpage

10

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Industrial and Commercial Use of Energy Conference (ICUE), 2012 Proceedings of the 9th

Conference_Location

Stellenbosch

ISSN

2166-0581

Print_ISBN

978-1-4673-1241-7

Type

conf

Filename

6330160