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Effect of circuit number on indoor coil serving as both condenser and evaporator in a heat pump.

Author(s) : HUANG D., YUAN X. L.

Summary

The effect of the circuit number on the indoor coil in a split-type air-source heat pump was studied numerically by EVAP-COND 2.0 version simulation package of American NIST. The indoor coil serves as an evaporator in a cooling cycle and as a condenser in a heating cycle. The air-and-refrigerant temperature difference increases with the circuit number, but the overall heat transfer coefficient drops. The evaporator capacity rises firstly, and then drops with the circuit number and achieves the maximum value at the optimum circuit number. The minimum evaporator capacity is less by 23.2% than the maximum. The air-and-refrigerant temperature difference and the overall heat transfer coefficient are the dominant factors governing the evaporator capacity, respectively, behind and beyond the optimum circuit number. The condenser capacity always decreases with the circuit number and the overall heat transfer coefficient acts as the dominant factor. The minimum condenser capacity is less by 40.5% than the maximum. These results demonstrate that the indoor coil in a heat pump is endowed with an optimal circuit number to increase the efficiencies and capacity in heating and cooling cycles simultaneously.

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Pages: ICR07-B2-800

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Details

  • Original title: Effect of circuit number on indoor coil serving as both condenser and evaporator in a heat pump.
  • Record ID : 2008-0853
  • Languages: English
  • Source: ICR 2007. Refrigeration Creates the Future. Proceedings of the 22nd IIR International Congress of Refrigeration.
  • Publication date: 2007/08/21

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