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Analytical expressions for optimum flow rates in evaporators and condensers of heat pumping systems.

Author(s) : GRANRYD E.

Summary

The flow velocities on the air or liquid side of evaporators and condensers in refrigeration or heat pump systems can often be chosen rather freely. This choice affects performance of the system considerably. The purpose of the paper is to show analytical relations indicating possible different optimum operating conditions. Considering a base case where the design data are known, simple analytical relations are deduced for optimum flow rates resulting in highest overall COP of the system when power for the compressor as well as pumps or fans are included. This solution is equivalent to the solution for minimum total energy demand for the operation at given cooling load. It is also shown that a different (and higher) flow rate will result in maximum net cooling capacity for a refrigerating system with fixed compressor speed. The expressions can be used for design purposes, but also to check if the there are reasons to adjust flow velocities in order to save energy in an existing system. The relations my also be incorporated in algorithms for optimal operation of systems with variable speed compressors.

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Details

  • Original title: Analytical expressions for optimum flow rates in evaporators and condensers of heat pumping systems.
  • Record ID : 2011-0321
  • Languages: English
  • Source: IIR/Eurotherm sustainable refrigeration and heat pump technology conference. Proceedings of the Eurotherm Seminar No. 88, Stockholm, Sweden, June 13-16, 2010.
  • Publication date: 2010/06/13

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