Reversing air-source heat pumps – Noise at defrost initiation and a noise reducing strategy
Reversing air-source heat pumps – Noise at defrost initiation and a noise reducing strategy
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DOI：
10.1016/j.ijrefrig.2015.10.017
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发表时间：
2016-02
期刊：
影响因子：
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通讯作者：
O. Gustafsson;C. Teuillières;Henrik Hellgren;M. Axell;J. Dalenbäck
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文献类型：
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作者：
O. Gustafsson;C. Teuillières;Henrik Hellgren;M. Axell;J. Dalenbäck
随着空气源热泵的使用越来越多，噪音干扰可能成为进一步市场增长和接受的障碍。稳态噪声水平和噪声事件都会影响报告的噪声干扰。在这项研究中，研究了一种暂态噪声事件：当热泵转换到除霜模式时产生的噪声。结果表明，除霜启动时热泵的噪声强烈依赖于系统在换挡时的压差。压差越小，噪声水平越低。因此，提出了在四通阀换向之前增加热泵空转时间的控制策略。这将对热泵的热容量产生很小的负面影响(<；3%)，但对COP的影响将可以忽略不计。
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.