Abstract
: A typical ground source heat pump (GSHP) system in South Korea has a ground heat exchanger (GHX) with a length of 100–150 m, which utilizes annually stable underground temperature to meet the loads of cooling, heating and hot water in buildings. However, most GSHP systems have been introduced in heating dominated areas because the system performance advantage is larger compared with air source heat pump system than that in cooling dominated areas. To effectively provide geothermal energy to the building in the limited urban area, it is necessary to install deep GHXs. Despite its large capacity, there are few studies on GSHP system with deep GHX over 300 m. In this study, to estimate the performance of the GSHP system with deep GHX and evaluate its feasibility, numerical simulation was conducted. To quantitatively analyze heat transfer between soil and GHX, the coupled model with GHX model and ground heat and groundwater transfer model was used. Furthermore, the heat exchange rate and the source temperature were calculated according to the operation modes, the length of GHX, and soil conditions such as geothermal gradient and thermal conductivity. As a result, the total heat exchange rate of GHX with a length of 300 m heat exchanger was 12.62 kW, 173% that of a length of 150 m. Finally, it was found that the GSHP system with deep GHX has realistic possibility in good condition of geothermal gradient.
Highlights
The efforts of the international society to respond to depletion of energy and climate change and realize sustainable development are continuing
The ground source heat pump (GSHP) system can achieve higher performance of system comparing with conventional air source heat pump (ASHP) system by utilizing more efficient underground temperature as heat source
The heat exchange rate (HER) per unit meter was determined to be as 48.58 W/m in Case 1 (d: 150 m), which is 6.5 W/m higher than that of Case 2 (GHX: 300 m)
Summary
The efforts of the international society to respond to depletion of energy and climate change and realize sustainable development are continuing. For the energy saving and energy independence in buildings, there have been many efforts using renewable energy technologies to meet increasing energy demands. Among the renewable energy technologies, the ground source heat pump (GSHP) system is very reasonable selection in building sector to meet the base load of heating, cooling and hot water without any weather condition effects. The GSHP system can achieve higher performance of system comparing with conventional air source heat pump (ASHP) system by utilizing more efficient underground temperature as heat source. This comparative advantage is more remarkable in the cold climate where air source heat pump system does not work well due to defrosting. Many studies on the GSHP system have been conducted in North
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