Two-seasonal thermal analyzes of systems with a vapor compressor heat pump and horizontal ground heat exchangers
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.References
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[3] Remiorz L.: Cost of heating of a residential house equipped with a heat pump – preliminary results of measurements. Rynek Ciepła 2012, Materiały i studia. Wyd. KAPRINT, Lublin 2012, 49-52 (in Polish).
[4] Demir H., Ahmet Koyun A., Temir G.: Heat transfer of horizontal parallel pipe ground heat exchanger and experimental verification. Applied Thermal Engineering, 29, 2009, 224-233.
[5] Kujawa T., Nowak W., Szaflik W.: Mathematical model of geothermal Field Exchanger. Archives of Thermodynamics 20 (1/2), 1999, 39-50.
[6] Cui P., Yang H., Spitler J.D., Fang Z.: Simulation of hybrid ground-coupled heat pump with domestic hot water heating systems using HVACSIM+. Energy and Buildings 40, 2008, 1731-1736.
[7] Chudzik P., Strzelczyk F.: Analiza ekonomiczna stosowania sprężarkowych pomp ciepła w systemach grzewczych. Rynek Energii 4 (89), 2010, 68-76
[8] Hanuszkiewicz-Drapała M.: Heating system with vapour compressor heat pump and horizontal ground heat exchanger. Archives of Thermodynamics 30 (4), 2009, 49-61.
[9] Hanuszkiewicz-Drapała M.: Numerical analyses of systems with vapour compressor heat pumps and horizontal ground heat exchangers. Rynek Energii 5 (90), 2010, 82-88 (in Polish).
[10] Hanuszkiewicz-Drapała M.: Thermal analysis of building heating system with a vapour compressor heat pump and a tubular ground heat exchanger. Monografia nr 314, Wydawnictwo Politechniki Śląskiej, Gliwice 2011 (in Polish).
[11] Hanuszkiewicz-Drapała M., Składzień J.: Operation Characteristics of Heat Pump System with Ground Heat Exchangers. Heat Transfer Engineering, 33 (7), 2012, 629-641.
[12] Hanuszkiewicz-Drapała M., Składzień J., Fic A.: Numerical analysis of the system: vapour compressor heat pump – vertical ground heat exchanger. Archives of Thermodynamics 28 (1), 2007, 15-32.
[13] Składzień J.: Thermal and economical analyses of ground freezing. Zeszyty Naukowe Politechniki Śląskiej, seria Energetyka, z. 78, monografia, Gliwice 1981(in Polish).
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: 22 dec. 2024.
Issue
Section
Thermodynamics
Keywords
heat pumps, ground heat exchanger, numerical modeling
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