University Of Tasmania

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Experimental study on the performance of a vapor injection high temperature heat pump

journal contribution
posted on 2023-05-18, 14:08 authored by He, Y, Cao, F, Jin, L, Xiaolin WangXiaolin Wang, Xing, Z
In this study, a vapor injection technique was applied in a high temperature heat pump (HTHP) for providing hot water at temperatures up to 88 °C. A prototype HTHP system with economizer vapor injection was developed and its performance was experimentally investigated under various operating conditions. Results showed that the vapor injection pressure had a large effect on heating capacity and on refrigerant temperature at the inlet of the electronic expansion valve (EEV). As the injection pressure increased from 0.82 to 0.98 MPa, the vapor injection flow ratio increased from 7.3% to 22.61% and the heating capacity increased by 7%. The system COP did not show significant change although the COP trend showed an optimal value for the injection pressure. The refrigerant temperature at the EEV inlet showed a subcooling of more than 16 °C under all studied conditions, which improved the EEV operating reliability.


Publication title

International Journal of Refrigeration








School of Engineering


Elsevier Sci Ltd

Place of publication

The Boulevard, Langford Lane, Kidlington, Oxford, England, Oxon, Ox5 1Gb

Rights statement

© 2015 Elsevier Ltd and International Institute of Refrigeration

Repository Status

  • Restricted

Socio-economic Objectives

Commercial energy efficiency