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Heating and cooling efficiency of residential standing column heat pumps without bleed in cold climates.

Number: pap. 391

Author(s) : MINEA V.

Summary

Typical houses located in cold climates generally require one 160 m deep vertical closed-loop heat exchanger for efficient ground-source heat pump systems. The borehole drilling cost for such ground heat exchangers is still relatively high. A concept potentially able to reduce this cost is standing-column systems, with or without groundwater bleeding. Such a system has been successfully validated in moderate climates for relatively short periods of operation in heating mode. The scope of this paper is to determine the reliability of residential standing-column heat pumps without bleed operating in extreme cold climate weathers. One of these extreme operation conditions consists in continuous running of the heat pump in heating mode over indefinite periods of time. Therefore, the first targeted issue was to determine if the shallower standing columns are able to provide stable and safe thermodynamic parameters to the heat pump compared to standard vertical closed-loop heat exchangers. Another issue was to determine if residential standing-column heat pump systems without bleed are economically feasible in cold climates, i.e. if the depths and costs of vertical uncased wells may be substantially reduced compared to those of typical vertical closed-loop systems.

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Pages: 11 p.

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Details

  • Original title: Heating and cooling efficiency of residential standing column heat pumps without bleed in cold climates.
  • Record ID : 30008995
  • Languages: English
  • Source: Clima 2013. 11th REHVA World Congress and 8th International Conference on Indoor Air Quality, Ventilation and Energy Conservation in Buildings.
  • Publication date: 2013/06/16

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