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Micro technology in heat pumping systems
Authors:ST Munkejord  HS Mhlum  GR Zakeri  P Neks  J Pettersen
Affiliation:S.T. Munkejord, H.S. Mæhlum, G.R. Zakeri, P. Nekså,J. Pettersen,
Abstract:Micro heat pumps, with dimensions in the order of centimetres, may in the future be utilised for the heating and/or cooling of buildings, vehicles, clothing, and other products or applications. A number of issues have yet to be solved, including the construction of a microscale compressor, and determination of micro heat exchanger heat transfer capacities. Test samples of micro heat exchangers and a corresponding test apparatus have been built. Some two-phase experiments with propane (R-290) as refrigerant have been conducted. Preliminary results for a micro condenser with 0.5 mm wide trapezoidal channels of 25 mm length showed that a heat flux of up to 135 kW/m2, based on the refrigerant-side area, was attainable. The corresponding overall heat transfer coefficient was 10 kW/(m2 K), with a refrigerant mass flux of 165 kg/(m2 s) and a refrigerant-side pressure drop of 180 kPa/m.
Keywords:Heat pump  Heat transfer  Miniaturization  HeatingMots-clé  : Pompe à  chaleur  Transfert de chaleur  Miniaturisation  Chauffage
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