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Small Ammonia Heat Pump with Variable Speed Compressor
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.ORCID iD: 0000-0001-9592-0202
KTH, School of Industrial Engineering and Management (ITM), Energy Technology.ORCID iD: 0000-0002-9902-2087
2012 (English)Conference paper (Refereed)
Abstract [en]

Ammonia is a natural refrigerant which has been used continuously for more than 100 years. From almost any technical perspective, it is an attractive refrigerant, having good cycle efficiency, good heat transfer properties and low pressure drop compared to most other refrigerants. The volumetric refrigerating effect is also higher than for other fluids of the same vapor pressure. Applications are nowadays restricted almost exclusively to large industrial or commercial systems.

We have previously demonstrated that ammonia is also a viable refrigerant for small systems (Palm 2008, Monfared and Palm 2011). In this paper we report on additional tests with a small capacity (7.2 kW) water to water heat pump for sanitary hot water production and space heating. Particularly, the losses in the compressor, electric motor and variable speed drive are investigated under full and part load conditions. New data for the general performance of the heat pump in terms of heat delivered at 60 °C for sanitary hot water production and at 40 °C for space heating, energy efficiency, etc. will also be reported.

Place, publisher, year, edition, pages
Keyword [en]
domestic, ammonia, heat pump, variable speed, inverter, minichannel, COP, efficiency, tap water heating, space heating, domestic hot water
National Category
Energy Engineering
URN: urn:nbn:se:kth:diva-98865ISBN: 978-2-913149-90-8OAI: diva2:539639
10th IIR Gustav Lorentzen Conference on Natural Refrigeration, Delft, The Netherlands

QC 20121212

Available from: 2012-07-04 Created: 2012-07-04 Last updated: 2016-06-22Bibliographically approved

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Abolhassani Monfared, BehzadPalm, Björn
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