eCite Digital Repository

Theoretical and experimental investigation of a combined R134a and transcritical CO2 heat pump for space heating


Yang, D and Song, Y and Cao, F and Jin, L and Wang, X, Theoretical and experimental investigation of a combined R134a and transcritical CO2 heat pump for space heating, International Journal of Refrigeration, 72 pp. 156-170. ISSN 0140-7007 (2016) [Refereed Article]

Copyright Statement

Copyright 2016 Elsevier Ltd and IIR

DOI: doi:10.1016/j.ijrefrig.2016.07.016


In this paper, a novel combined R134a and transcritical CO2 system was studied theoretically and experimentally for space heating. Experimental results showed that the ambient and space heating temperatures substantially affected the system performance. At the heating requirement with 50 C in feed water temperature and 70 C in supply water temperature, the heating capacity and coefficient of performance (COP) increased by 32.6% and 18.2%, respectively, as the ambient temperature increased from −20 C to 0 C. The system COP increased by up to 15% at fixed ambient condition as the feed and supply water temperatures decreased from 50 C/70 C to 40 C/50 C. A mathematical model was also developed and validated using experimental data. The model was used to investigate the performance improvement of the combined system in comparison to the standard transcritical CO2 system. The comparison results showed that the combined system improved the COP by up to 22%.

Item Details

Item Type:Refereed Article
Keywords:transcritical CO2 heat pump, space heating, COP, heating capacity
Research Division:Engineering
Research Group:Mechanical Engineering
Research Field:Energy Generation, Conversion and Storage Engineering
Objective Division:Energy
Objective Group:Energy Conservation and Efficiency
Objective Field:Residential Energy Conservation and Efficiency
UTAS Author:Wang, X (Associate Professor Xiaolin Wang)
ID Code:113659
Year Published:2016
Web of Science® Times Cited:15
Deposited By:Engineering
Deposited On:2017-01-11
Last Modified:2019-01-14

Repository Staff Only: item control page