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Integrated HVAC system with direct expansion ground source heat pumps.

Author(s) : MINEA V.

Summary

The electrical heating in the residential sector may be optimized by using mono-fluid heat pumps with direct expansion ground heat exchangers and direct condensing through radiant floors. Such systems are simple and efficient because eliminate secondary fluids (brine, air), circulation pumps, air handlers and fans. This paper presents some design criteria and energy performances of a residential, integrated HVAC system with three direct expansion ground heat pumps and exhaust air heat recovery device. Are presented the main results obtained in a 2-story house during a typical Canadian cold climate heating season. The system seasonal energy performance depends on soil properties, ground heat exchangers depth of burial, and outdoor temperatures and precipitations. The seasonal COP of DX ground heat pumps averaged 3.8, while the temperatures of the concrete slab (basement) and wooden floors (1st and 2nd stories) varied around 26°C ensuring homogeneous vertical thermal stratification and highly indoor comfort. Improvements of refrigerant circuits and controls allowed avoiding instability phenomenon and improving overall performances and reliability of the integrated HVAC system with direct expansion ground source heat pumps.

Details

  • Original title: Integrated HVAC system with direct expansion ground source heat pumps.
  • Record ID : 2008-2738
  • Languages: English
  • Source: Clima 2007. WellBeing Indoors. Proceedings of the 9th REHVA World Congress [CD-ROM + Abstract book].
  • Publication date: 2007/06/10

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