Thermal Analysis of Vertical Ground Exchangers of Heat Pumps

Składzień, J.; La, Małgorzata Hanuszkiewicz-Drapa; Fic, A.

doi:10.1080/01457630500397088

Cited by 8 publications

(5 citation statements)

References 1 publication

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“…This causes moisture migration around the pipe and heat rate per unit length of GHE pipe decreases up to a certain time. In the vertical GSHP study of Skladzien et al [12], this time is approximately 100 days. But if the heat extracted from the ground in winter can be compensated by the heat injection in summer, the ambient mean temperature around the heat exchanger will change little and thus the performances of the GHE will not deteriorate after its long duration of operation for several years [41].…”

Section: Resultsmentioning

confidence: 98%

“…Within the next 16 h period of a day, while GHE is out of operation, some kind of regeneration of the ground surrounding GHE pipes takes place, and the gradients of the temperature close to the pipes become higher when compared with the case of continuous work of system. Skladzien et al [12], have reported that the heat rate per unit length of GHE pipe in the vertical exchanger working continuously is about twice less than the average heat rate for an 8 h working period of the exchanger, which works periodically. The considered periodical work of the heat pump can therefore be profitable from an economical point of view.…”

Section: Resultsmentioning

confidence: 98%

“…As a result of advantages of closed-loop GSHP, many researches were conducted all over the world [8][9][10][11][12] and they are used for both commercial and residential applications [5,13].…”

Section: Introductionmentioning

confidence: 99%

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Experimental performance investigation of a horizontal ground source compression refrigeration machine

Coşkun

Pulat

Unlu

et al. 2007

Int. J. Energy Res.

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SUMMARYIn this paper, the effect of various system parameters on horizontal ground source compression refrigeration machine (CRM) performance is studied experimentally in Bursa, Turkey. A ground heat exchanger (GHE) system connected to CRM in a test room in the air conditioning and refrigeration laboratory of Uludag University has been designed and constructed. This system was tested for space cooling in August and September 2004 and performance tests were performed during this period. Overall, system mainly consists of the GHE (GHE-water circuit) and CRM (CRMrefrigerant circuit). Refrigerant is R134a. Hourly variations of inlet and outlet water temperatures, extracted heat from test room, rejected heat to ground, compression ratio, total power consumption, and coefficient of performance (COP) values for both whole system and only CRM are obtained. Thermal properties of soil are also estimated by using experimental data and theory. Cooling load of test room and rejected heat to ground, and all COP values are also presented. Finally, heat rejection rate to ground with respect to leaving water temperature from GHE is given. The COP of the overall system changes between 2 and 2.5, also CRM COP values are in the range of 3 and 3.86.

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Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 98%

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Experimental performance investigation of a horizontal ground source compression refrigeration machine

Coşkun

Pulat

Unlu

et al. 2007

Int. J. Energy Res.

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“…The SL-GSHP has been studied for decades. Składzień et al [2] analyzed an SL-GSHP system by computational simulation. They utilized packaged software for finite-element approximation to simulate vertical GLHX.…”

Section: Introductionmentioning

confidence: 99%

Performance Evaluation of Geothermal Heat Pump With Direct Expansion Type Vertical Ground Heat Exchanger

Kim

Lee

Baik

et al. 2015

Heat Transfer Engineering

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Vertical closed-loop groun-source heat pump systems have been installed widely in Korea since they can extract a moderate temperature level of geothermal heat in a relatively small area. For a ground heat exchanger, a vertical closed-loop type with brine circulation is mostly preferred since it is simpler and less harmful to the ground environment. However, it requires a secondary loop between the refrigerant in a heat pump and the brine. By adding a geothermal heat exchanger in the secondary heat exchange loop, circulation pumps should be attached and the temperature difference between refrigerant and ground would be increased, which causes performance degradation. In this paper, performances of direct expansion ground-source heat pump were evaluated mathematically as an alternative to the conventional secondary-loop ground-source heat pump.

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“…In a situation when a heat pump system uses geothermal source, the heat is collected from the ground via an intermediate medium flowing inside the horizontal or vertical heat exchanger pipes. Investigations into ground heat exchangers and heat pump systems have been carried out for years in many countries [3,[6][7][8][9][10][11][12][13][14]. They have an experimental and computational form concerning vertical and horizontal ground heat exchangers.…”

Section: Introductionmentioning

confidence: 99%

Heating system with vapour compressor heat pump and vertical U-tube ground heat exchanger

Hanuszkiewicz-Drapała¹,

Składzień²

2010

Archives of Thermodynamics

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In the paper a heating system with a vapour compressor heat pump and vertical U-tube ground heat exchanger for small residential house is considered. A mathematical model of the system: heated object -vapour compressor heat pump -ground heat exchanger is presented shortly. The system investigated is equipped, apart from the heat pump, with the additional conventional source of heat. The processes taking place in the analyzed system are of unsteady character. The model consists of three elements; the first containing the calculation model of the space to be heated, the second -the vertical U-tube ground heat exchanger with the adjoining area of the ground. The equations for the elements of vapour compressor heat pump form the third element of the general model. The period of one heating season is taken into consideration. The results of calculations for two variants of the ground heat exchanger are presented and compared. These results concern variable in time parameters at particular points of the system and energy consumption during the heating season. This paper presents the mutual influence of the ground heat exchanger subsystem, elements of vapour compressor heat pump and heated space.

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Thermal Analysis of Vertical Ground Exchangers of Heat Pumps

Cited by 8 publications

References 1 publication

Experimental performance investigation of a horizontal ground source compression refrigeration machine

Experimental performance investigation of a horizontal ground source compression refrigeration machine

Performance Evaluation of Geothermal Heat Pump With Direct Expansion Type Vertical Ground Heat Exchanger

Heating system with vapour compressor heat pump and vertical U-tube ground heat exchanger

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