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Charge minimizaton in a 30 kW air to water heat pump
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.ORCID iD: 0000-0002-9902-2087
2014 (English)In: 11th IIR Gustav Lorentzen Conference on Natural Refrigerants: Natural Refrigerants and Environmental Protection, GL 2014, 2014, 987-994 p.Conference paper (Refereed)
Abstract [en]

Modern manufacturing technology allows production of tubes and channels with small hydraulic diameters. Heat pumps and refrigeration equipment designed using such tubes may have considerably lower charge than conventional systems while having just as good thermal performance. In this paper, the possibilities of charge reduction are investigated, using a 30 kW propane air to water heat pump as an example. It is shown that changing the tubing in the evaporator and condenser is a vital first step, but that considerable additional charge reduction can be reached by careful consideration in the selection and designs of other parts of the system as well. In particular it is important to avoid headers where liquid may be trapped and oversized receivers. Additionally, in a well-designed system a substantial part of the refrigerant may be absorbed in the compressor oil. Reducing the amount of refrigerant in this component requires novel thinking concerning the compressor design.

Place, publisher, year, edition, pages
2014. 987-994 p.
Keyword [en]
Charge reduction, refrigerant, heat pump, propane, MPE tube
National Category
Energy Engineering
URN: urn:nbn:se:kth:diva-171746ISI: 000352781600117ScopusID: 2-s2.0-84932115671ISBN: 9782362150043OAI: diva2:844625
11th IIR Gustav Lorentzen Conference on Natural Refrigerants - Natural Refrigerants and Environmental Protection, AUG 31-SEP 02, 2014, Hangzhou, PEOPLES R CHINA

QC 20150807

Available from: 2015-08-07 Created: 2015-08-05 Last updated: 2015-08-07Bibliographically approved

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Palm, Björn
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Applied Thermodynamics and Refrigeration
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ReferencesLink to record
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