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Reversing air-source heat pumps. Noise at defrost initiation and a noise reducing strategy.

Author(s) : GUSTAFSSON O., TEUILLIERES C., HELLGREN H., et al.

Type of article: Article, IJR article

Summary

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.

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Format PDF

Pages: 137-144

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Details

  • Original title: Reversing air-source heat pumps. Noise at defrost initiation and a noise reducing strategy.
  • Record ID : 30016774
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 62
  • Publication date: 2016/02

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