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Experimental investigation on a capillary tube based transcritical CO2 heat pump system


Song, Y and Wang, J and Cao, F and Shu, P and Wang, X, Experimental investigation on a capillary tube based transcritical CO2 heat pump system, Applied Thermal Engineering, 112 pp. 184-189. ISSN 1359-4311 (2017) [Refereed Article]

Copyright Statement

Copyright 2016 Elsevier Ltd. All rights reserved.

DOI: doi:10.1016/j.applthermaleng.2016.10.033


In this study, a transcritical CO2 heat pump system using a capillary tube as an expansion device was experimentally investigated. A prototype was developed for this purpose. Experimental study was conducted under different outdoor and indoor temperatures. The results showed that the system cooling capacity and coefficient of performance (COP) dropped by 22% and 24%, respectively as the outdoor air temperature increased from 30 to 40C and increased by 12% and 15%, respectively as the indoor air temperature increased from 22 to 32C. The system performance was further compared with the transcritical CO2 heat pump using an electronic expansion valve (EEV) at different gas-cooler outlet temperatures. The comparison results showed that the transcritical CO2 heat pump using the capillary tube is promising and could achieve performance close to the heat pump using EEV over a wide range of gas-cooler outlet temperature.

Item Details

Item Type:Refereed Article
Keywords:transcritical heat pump, capillary, coefficient of performance, carbon dioxide
Research Division:Engineering
Research Group:Mechanical engineering
Research Field:Energy generation, conversion and storage (excl. chemical and electrical)
Objective Division:Energy
Objective Group:Energy efficiency
Objective Field:Residential energy efficiency
UTAS Author:Wang, X (Professor Xiaolin Wang)
ID Code:113581
Year Published:2017
Web of Science® Times Cited:10
Deposited By:Engineering
Deposited On:2017-01-09
Last Modified:2018-07-30

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