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Capacity control in ground source heat pump systems. II. Comparative analysis between on/off controlled and variable capacity systems.

Author(s) : MADANI H., CLAESSON J., LUNDQVIST P.

Type of article: Article, IJR article

Summary

In this paper, as the second part of two, modeling and simulation was carried out for a ground source heat pump (GSHP) system in the presence of all the most important interacting sub-systems such as building, ground heat source, electrical auxiliary heater, and the heat pump unit in order to make a fair and comprehensive comparison between the annual performance of on/off controlled and variable capacity systems. The annual modeling showed that dimensioning of the on/off controlled GSHP based on the peak heat demand of the building plays a significant role when the two control strategies are compared: if the on/off controlled GSHP is dimensioned to cover only 55% of the peak heat demand of the building, the electrical auxiliary, which then covers about 10% of the annual heating demand of the building, makes the SPF of the on/off controlled GSHP to be lower than the one of the variable speed system. On the contrary, when the on/off controlled system is dimensioned to cover more than 65% of the building’s peak heat demand, i.e. more than 95% of the annual heat demand of the building, there is no considerable difference between the SPFs of the on/off controlled and variable capacity systems.

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Pages: 1934-1942

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Details

  • Original title: Capacity control in ground source heat pump systems. II. Comparative analysis between on/off controlled and variable capacity systems.
  • Record ID : 30002286
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 34 - n. 8
  • Publication date: 2011/12

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