Two-seasonal thermal analyzes of systems with a vapor compressor heat pump and horizontal ground heat exchangers

  • Małgorzata Joanna Hanuszkiewicz-Drapała Silesian University of Technology Institute of Thermal Technology
  • Jan Składzień Silesian University of Technology Institute of Thermal Technology

Abstract

The selected results of thermal analyses of heating systems with vapour compressor heat pumps and horizontal ground heat exchangers are presented in the paper. The operation of this system for two lengths of the heat exchanger pipes was considered and compared. Thermal analyses concern two consecutive heating seasons. During heating seasons the heat pump is working periodically, supplying the heat to the object – a small residential house. Heat is also periodically transferred from the ground to the heat pump unit. The demand for heat for this house, variable in time, was calculated. The heat pump is supported by the additional, conventional heat source when the heat pump productivity is not enough. Operation characteristic parameters of this system (among others: characteristic temperatures, heat fluxes, electric driving power of the compressor) are variable in time. Thermal state of the ground is also variable in time. Natural, thermal regeneration of the ground during spring and summer when the heat pump system does not operate was taken into account. The thermal analyses of the system enable to compare the electric energy consumption in the system heat pump - ground heat exchanger and energy transferred from the additional heat source to the heated space during the first and the second heating seasons. The results presented in the paper enable also to determine the influence of length of the horizontal ground heat exchanger pipes on the functioning parameters of this system during two-seasonal operation.

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Published
2014-05-15
How to Cite
HANUSZKIEWICZ-DRAPAŁA, Małgorzata Joanna; SKŁADZIEŃ, Jan. Two-seasonal thermal analyzes of systems with a vapor compressor heat pump and horizontal ground heat exchangers. Journal of Power Technologies, [S.l.], v. 94, n. 2, p. 135--143, may 2014. ISSN 2083-4195. Available at: <https://papers.itc.pw.edu.pl/index.php/JPT/article/view/405>. Date accessed: 29 july 2021.
Section
Thermodynamics

Keywords

heat pumps, ground heat exchanger, numerical modeling

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