Abstract
Use of ground source heat pumps has increased significantly in recent years for space heating and cooling of residential houses and commercial buildings, in both heating (i.e., cold region) and cooling (i.e., warm region) dominated climates, due to its low carbon footprint. Ground source heat pumps exploit the passive energy storage capacity of the ground for heating and cooling of buildings. The main focus of this paper is to critically review how different construction and operation parameters (e.g., pipe configuration, pipe diameter, grout, heat injection rate, and volumetric flow rate) have an impact on the thermal efficiency of the vertical ground heat exchanger (VGHE) in a ground source heat pump (GSHP) system. The published literatures indicate that thermal performance of VGHEs increases with an increase of borehole diameter and/or pipe diameter. These literatures show that the borehole thermal resistance of VGHEs decreases within a range of 9% to 52% due to pipe configurations and grout materials. Furthermore, this paper also identifies the scope to increase the thermal efficiency of VGHE. The authors conclude that in order to enhance the heat transfer rate in VGHE, any attempt to increase the surface area of the pipe configuration would likely be an effective solution.
Highlights
In a world under climate change emergency, the importance of eco-friendly renewable energy as a replacement of fossil fuel based energy cannot be overemphasized
The results showed the thermal performance in ground heat exchangers (GHEs) improved by improved by using turbulent flow rate and increasing the flow rate in pipes
The results indicated that the coil-type has higher heat exchange efficiency than the same for but wasbut found be more expensive than thethan
Summary
In a world under climate change emergency, the importance of eco-friendly renewable energy as a replacement of fossil fuel based energy cannot be overemphasized. Geothermal energy is one of the cleanest sources of renewable energy that can be used to produce electricity and heat. Ground source heat pump (GSHP) systems, consisting of heat pumps and ground heat exchangers, is a source of renewable energy in both cold and warm climates. This technology is employed to extract the heat from buildings in summer and transfer into the ground, as well as in winter to extract the heat from the ground and transfer into the buildings. The aim of this paper is to review the published literatures on literatures on various options, including pipe configurations, to improve the efficiency of ground various options, including pipe configurations, to improve the efficiency of ground heat exchangers
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