Study on Thermal Performances of a Horizontal Ground Heat Exchanger Geothermal System with Different Configurations and Arrangements

The Ground-Coupled or Source Heat Pump (GCHP/GSHP) system is increasingly being considered as an alternative to traditional cooling/heating system because it can reduce the emission of greenhouse gases. The GCHP/GSHP system uses sustainable ground temperature to emit heat during the summer and to extract heat during the winter. It is a ubiquitous system because it can be used at any time or place and semi-permanent energy. The geothermal system is composed of Ground Heat Exchanger (GHE), heat pump and load facilities. The GHE is embedded in a borehole, which is made up of GHE and grout. The borehole thermal resistance is the most important parameter in designing the geothermal system because it shows the quantity of heat transfer in the borehole. There are many methods to estimate the borehole thermal resistance. Thermal Performance Tests (TPTs) were conducted to directly measure the borehole thermal resistance of several kinds of GHEs. Then the experiment results and analytical results were compared in order to select the most accurate methods to evaluate the borehole thermal resistance.

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PERFORMANCE MONITORING STUDY OF BUILDING-INTEGRATED GEOTHERMAL SYSTEM IN WINTER AND SUMMER

International Journal of Air-Conditioning and Refrigeration ◽

10.1142/s2010132513500156 ◽

2013 ◽

Vol 21 (02) ◽

pp. 1350015 ◽

Cited By ~ 2

Author(s):

HYUNG-KYOU RYU

Keyword(s):

Heat Exchanger ◽

Performance Monitoring ◽

Winter Season ◽

Geothermal System ◽

Ground Heat Exchanger ◽

Test Bed ◽

Cooling Performance ◽

Heating And Cooling ◽

Monitoring Study ◽

Grouting Materials

The objective of this study is to develop and evaluate ground heat exchanger using the foundation of a building. To this end, we added ground heat exchanger feature to PHC piles and evaluated its heating and cooling performance. First, we investigated the building's foundation system, pipes for heat exchanger and grouting materials. As an outcome, we designed a prototype of building-integrated geothermal system (BIGS). Second, we applied BIGS to apartment houses utility building in Osan S-apartment and G-housing in Song-Do that is 80% energy saving test bed. Third, for the performance of BIGS, we monitored heating performance during winter season in the Osan facility and cooling performance during summer season in the Song-Do facility.

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THERMODYNAMIC OPTIMIZATION OF HORIZONTAL MULTICHANNEL GROUND HEAT EXCHANGER

10.1615/tfec2018.fip.021677 ◽

2018 ◽

Author(s):

Mayameen N. Reda ◽

Titan C. Paul ◽

Rajib Mahamud

Keyword(s):

Heat Exchanger ◽

Thermodynamic Optimization ◽

Ground Heat Exchanger

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Analysis of Heat Exchange Rate for Low-Depth Modular Ground Heat Exchanger through Real-Scale Experiment

Energies ◽

10.3390/en14071893 ◽

2021 ◽

Vol 14 (7) ◽

pp. 1893

Author(s):

Kwonye Kim ◽

Jaemin Kim ◽

Yujin Nam ◽

Euyjoon Lee ◽

Eunchul Kang ◽

...

Keyword(s):

Exchange Rate ◽

Heat Exchanger ◽

Heat Exchange ◽

Heat Pump ◽

Heat Extraction ◽

Ground Heat Exchanger ◽

Pump System ◽

Heat Pump System ◽

Scale Experiment ◽

Real Scale

A ground source heat pump system is a high-performance technology used for maintaining a stable underground temperature all year-round. However, the high costs for installation, such as for boring and drilling, is a drawback that prevents the system to be rapidly introduced into the market. This study proposes a modular ground heat exchanger (GHX) that can compensate for the disadvantages (such as high-boring/drilling costs) of the conventional vertical GHX. Through a real-scale experiment, a modular GHX was manufactured and buried at a depth of 4 m below ground level; the heat exchange rate and the change in underground temperatures during the GHX operation were tracked and calculated. The average heat exchanges rate was 78.98 W/m and 88.83 W/m during heating and cooling periods, respectively; the underground temperature decreased by 1.2 °C during heat extraction and increased by 4.4 °C during heat emission, with the heat pump (HP) working. The study showed that the modular GHX is a cost-effective alternative to the vertical GHX; further research is needed for application to actual small buildings.

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