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Reversing air-source heat pumps - Noise at defrost initiation and a noise reducing strategy AN J, 2009, International Journal of Refrigeration, V32, P1112

O. Gustafsson ; C. Teuillieres ; H. Hellgren ; M. Axell ; Jan-Olof Dalenbäck (Institutionen för bygg- och miljöteknik, Installationsteknik )
International Journal of Refrigeration-Revue Internationale Du Froid (0140-7007). Vol. 62 (2016), p. 137-144.
[Artikel, refereegranskad vetenskaplig]

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.

Nyckelord: Heat pump, Noise reduction, Pressure differences, Defrost, 4-way valve, Energy, COP, conditioner, Thermodynamics, Engineering



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CPL Pubid: 235071

 

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Institutioner (Chalmers)

Institutionen för bygg- och miljöteknik, Installationsteknik

Ämnesområden

Energi
Hållbar utveckling
Energisystem

Chalmers infrastruktur