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Air to hot water heat pumping and air conditioning using thin film heat transfer.

Author(s) : STEWART D. B.

Summary

An equation is developed for modelling the total cost of heat pumping from ambient air to hot water in a domestic hot water supply tank. The total cost of heat pumping is optimised using heat flux as the optimization parameter to arrive at the minimum total cost of providing hot water. Calculated results are presented for payback periods of a domestic heat pump hot water supply incorporating a 315 litre capacity hot water storage tank, rated at 2 kilowatts for pumped heat rejection, and based on the total cost of heat pumping equal to the tariff for electricity from off-peak to continuous demand. Operating cost as low as 41% of electricity tariff is shown to be obtainable for the proposed domestic hot water supply using heat pumping incorporating thin film heat transfer. When hot water heat pumping is not required, usual air conditioning for house inside comfort is mathematically modelled to show optimization for minimum total cost of air conditioning with heat rejection to outside air, using forced convection heat transfer of air and thin film condensation of refrigerant in a condenser added to the hot water heat pump, giving an operating cost for air conditioning of 15% of electricity tariff.

Details

  • Original title: Air to hot water heat pumping and air conditioning using thin film heat transfer.
  • Record ID : 1993-3599
  • Languages: English
  • Source: Heat Pumps for Energy Efficiency and Environmental Progress: Proceedings of the 4th International Energy Agency Heat Pump Conference.
  • Publication date: 1993/04/26
  • Document available for consultation in the library of the IIR headquarters only.

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