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  • 1.
    Gustafsson, Ola
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Energi och Bioekonomi, Klimatisering och installationsteknik.
    Axell, Monica
    Larsson, Krister
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP Sveriges tekniska forskningsinstitut / Akustik (Eta).
    Hellgren, Henrik
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP Sveriges tekniska forskningsinstitut / Akustik (Eta).
    Teuillieres, Cedric
    Outdoor units of air-source heat pumps - a noise investigation2013Conference paper (Other academic)
  • 2.
    Gustafsson, Ola
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Energi och Bioekonomi, Klimatisering och installationsteknik.
    Hellgren, Henrik
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP Sveriges tekniska forskningsinstitut / Akustik (Eta).
    Haglund Stignor, Caroline
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Energi och Bioekonomi, Klimatisering och installationsteknik.
    Axell, Monica
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Energi och Bioekonomi, Klimatisering och installationsteknik.
    Larsson, Krister
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP Sveriges tekniska forskningsinstitut / Akustik (Eta).
    Teuillieres, Cedric
    EDF RandD European Centre, France.
    Flat tube heat exchangers – direct and indirect noise levels in heat pump applications2014In: Applied Thermal Engineering, Vol. 66, no 5, p. 104-112Article in journal (Refereed)
    Abstract [en]

    In the outdoor unit of an air-source heat pump the fan is a major noise source. The noise level from the fan is dependent on its state of operation: high air-flow and high pressure drop often result in higher noise levels. In addition, an evaporator that obstructs an air flow is a noise source in itself, something that may contribute to the total noise level. To be able to reduce the noise level, heat exchanger designs other than the common finned round tubes were investigated in this study. Three types of heat exchanger were evaluated to detect differences in noiselevel and air-side heat transfer performance at varying air flow. The measured sound power level from all the heat exchangers was low in comparison to the fan sound power level (directeffect). However, the heat exchanger design was shown to have an important influence on the sound power level from the fan (indirect effect). One of the heat exchangers with flat tubes was found to have the lowest sound power level, both direct and indirect, and also the highest heat transfer rate. This type of flat tube heat exchanger has the potential to reduce the overall noise level of a heat pump while maintaining heat transfer efficiency.

  • 3.
    Gustafsson, Ola
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Teuillieres, Cedric
    EDF R&D, France.
    Hellgren, Henrik
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Axell, Monica
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Dalenbäck, Jan-Olof
    Chalmers University of Technology, Sweden.
    Reversing air-source heat pumps - Noise at defrost initiation and a noise reducing strategy2016In: International journal of refrigeration, ISSN 0140-7007, E-ISSN 1879-2081, Vol. 62, p. 137-144Article in journal (Refereed)
    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.

  • 4.
    Kårekull, Oscar
    et al.
    Fläkt Woods, Sweden.
    Hellgren, Henrik
    RISE - Research Institutes of Sweden, Built Environment, Building Technology.
    Noise and indoor air quality: HVAC noise characteristics2017Report (Other academic)
    Abstract [en]

    Noise from Heating Ventilation and Air Conditioning (HVAC) systems in residential buildings have an influence on the residents´ well-being. The characteristics of HVAC noise have been investigated as to recommend typical spectra for the design of a listening test using sound recordings. An HVAC system layout is developed to represent a system in a residential building where variations of the noise spectrum are possible without the use of unrealistic conditions. From a spectrum shape perspective the main parameter of the system is the balance between noise originated from the heat recovery unit and the duct component related noise. The receiving room spectrum is here mainly modified by the use of different silencers close to the heat recovery unit and the balance between the pressure loss of the air terminal device and a nearby damper. Modifications of the heat recovery unit total airflow and the inflow properties to the air terminal device are also investigated. Variations at both low and high frequencies are possible, at a constant total A-weighted sound pressure level, using these system properties.

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