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  • 1.
    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.

  • 2.
    Lindberg, Ulla
    et al.
    RISE - Research Institutes of Sweden (2017-2019), Built Environment, Energy and Circular Economy. University of Borås, Sweden; Chalmers University of Technology, Sweden.
    Fahlén, Per
    RISE - Research Institutes of Sweden (2017-2019), Built Environment, Energy and Circular Economy. Chalmers University of Technology, Sweden.
    Axell, Monica
    RISE - Research Institutes of Sweden (2017-2019).
    Fransson, Niklas
    University of Gothenburg, Sweden.
    Thermal comfort in the supermarketenvironment – multiple enquiry methods and simultaneous measurements of the thermal environment2017In: International journal of refrigeration, ISSN 0140-7007, E-ISSN 1879-2081, Vol. 82, p. 426-435Article in journal (Refereed)
    Abstract [en]

    In the supermarket environment three factors must be considered: food (food quality), personnel (working conditions), and customers.The customers do not remain in this environment very long but are of particular interest since they constitute the supermarket’s commercial basis. However, there are no recommendations on the indoor environment based on this category. This study compares the perceived indoor thermal environment with simultaneous objective measurements of the thermal environment and includes multiple enquiry methods. These methods have been used for this specific environment in order to understand how customers perceive, evaluate, and prefer variations in the thermal environment.

    Measurements were performed in summer and winter in front of twelve display cabinets, over 1100 questionnaires have been received.To provide recommendations, this study presents measured and perceived comfort in supermarkets, information which can be used for prescribing suitable thermal environments for customers.

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