Abstract
Ground source cooling system (GSCS) uses a ground heat exchanger (GHE) for exchanging heat with the ground. A spiral-tube GHE is gaining interest in recent year. This study presents an experimental analysis of thermal performance of shallow spiral-tube ground heat exchanger (GHE) installed in the ground at 3 m depth in series and parallel configurations. These GHE configurations offer a compromise between the conventional vertical and horizontal GHEs. The spiral-tube GHE which is consist of spiral pipe installed in the borehole provides a better performance in application of GSCS. The thermal performances ofspiraltube GHE in series and parallel configurations were investigated under actual condition. Inlet and outlet temperatures of the both configurations were measured and periodically recorded. The average heat exchange rates of the GHEs are 122.4 W m –1 in parallel configuration and 86.2 W m –1in series configuration. Heat exchange rate of the spiral-tube GHEs in parallel configuration provides a better performance than that of in series configuration. The spiral-tube GHE in shallow depth can be applied in the GSCS.
Highlights
The ground source heat pump system (GSHP) has been widely used for space heating and cooling system in the building
Water was circulated through the SGHE#1, SGHE#2 and SGHE#3
Circulated water flowed to the inlet pipes of each ground heat exchanger (GHE) in the parallel configuration
Summary
The ground source heat pump system (GSHP) has been widely used for space heating and cooling system in the building. The spiral-tube GHE which is consist of spiral pipe installed in the vertical borehole is gaining interest in recent years [13,14,15,16,17,18]. A number of shallow spiral-tube GHEs can be installed together in series and parallel configurations to meet the cooling demand of building. The performances of the shallow spiral-tube GHEs in both configurations are needed as a important parameter in application. The three spiral-tube GHEs namely SGHE#1, SGHE#2 and SGHE#3 were installed in the borehole of 3 m depth. The experiments were carried-out by circulating water through the three spiral-tube GHE in series and parallel configurations. The thermal performance of the spiral-tube GHE is evaluated by calculating its heat exchange rate (Q):.
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