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Two-seasonal thermal analyses of systems with a vapour compressor heat pump and horizontal ground heat exchangers

Hanuszkiewicz-Drapała M., Składzień J.

Journal of Power Technologies

2014

Vol. 94, nr 2

135--143

Selected results of thermal analyzes of heating systems with vapor compressor heat pumps and horizontal ground heat exchangers are presented in this paper. Operation of this system for two lengths of heat exchanger pipes was considered and compared. The thermal analyzes concern two consecutive heating seasons. During heating seasons the heat pump works periodically, supplying heat to 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 an additional, conventional heat source when heat pump productivity is insufficient. The characteristic operating parameters of this system (among others: characteristic temperatures, heat fluxes, electric driving power of the compressor) are variable in time. The 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 analyzes of the system enable one 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 this paper also make it possible to determine the influence of the length of the horizontal ground heat exchanger pipes on the functioning parameters of this system during two-seasonal operation.