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Reversing air-source heat pumps - Noise at defrost initiation and a noise reducing strategy
RISE, SP – Sveriges Tekniska Forskningsinstitut.
EDF R&D, France.
RISE, SP – Sveriges Tekniska Forskningsinstitut.ORCID iD: 0000-0003-2673-0688
RISE, SP – Sveriges Tekniska Forskningsinstitut.ORCID iD: 0009-0000-7874-4702
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2016 (English)In: International journal of refrigeration, ISSN 0140-7007, E-ISSN 1879-2081, Vol. 62, p. 137-144Article in journal (Refereed) Published
Abstract [en]

With the increasing use of air source heat pumps, noise disturbance can be a barrier for further market growth and acceptance. Both steady state noise level and noise events influence reported noise disturbance. In this study one of the transient noise events was investigated: the noise initiated when the heat pump shifts to defrost mode. The results show that noise from a heat pump at defrost initiation was strongly dependent on the pressure differences in the system at the time of the shift. A reduced pressure difference resulted in a lower noise level. A control strategy that adds an idling time for the heat pump just before the shift of the 4-way valve is therefore suggested. This will have a small negative effect (<3%) on the heat capacity of the heat pump but the effect upon the COP will be negligible.

Place, publisher, year, edition, pages
Elsevier, 2016. Vol. 62, p. 137-144
Keywords [en]
Heat pump, Noise reduction, Pressure differences, Defrost, 4-way valve, Energy, COP
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-417DOI: 10.1016/j.ijrefrig.2015.10.017Scopus ID: 2-s2.0-84955457991OAI: oai:DiVA.org:ri-417DiVA, id: diva2:942016
Available from: 2016-06-23 Created: 2016-06-23 Last updated: 2024-03-25Bibliographically approved

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Hellgren, HenrikAxell, Monica

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