Field Testing of an Economised Vapour Injection Heat pump

M. J. Huang, Neil Hewitt, Nguyen Minh

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

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The purpose of this work was to evaluate the performance of an economised vapour injection (EVI) compressor utilised in an air source heat pump. It was to ascertain if such a unit is capable of economically heating a typical UK family home that was originally heated by a high temperature wet radiator system supplied with hot water from an oil boiler. The concerns were based around maintaining a sufficiently high seasonal coefficient of performance when utilising cold air as a heat source and delivering hot water to a heating circuit originally designed for temperatures of 60°C or more.The EVI compressor has the capability of overcoming some of the difficulties of high temperature lift operation (namely reduced capacity) by allowing liquid subcooling to maintain high evaporator capacity in order to provide adequate heating during cold ambient air periods. The laboratory tests (based on the EN14511 standard) carried out using air temperatures of -12°C to +15°C and water was delivered from 35°C to 65°C were found to have a superior performance to a compressor without EVI. The system was installed in a family home and its performance evaluated.
Original languageEnglish
Title of host publicationUnknown Host Publication
PublisherInternational Institute of Refrigeration
Number of pages8
ISBN (Print)ISBN13 978-2-913149-59-5
Publication statusPublished (in print/issue) - Aug 2007
Event22nd IIR International Congress of Refrigeration - Beijing, China
Duration: 1 Aug 2007 → …


Conference22nd IIR International Congress of Refrigeration
Period1/08/07 → …

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