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1.	Gustafsson, O., et al. (author) Reversing air-source heat pumps - Noise at defrost initiation and a noise reducing strategy 2016 In: International Journal of Refrigeration. - : Elsevier BV. - 0140-7007 .- 1879-2081. ; 62, s. 137-144 Journal article (peer-reviewed)abstract 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. (C) 2016 Elsevier Ltd and International Institute of Refrigeration. All rights reserved.

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