Abstract
The heat transfer rate and borehole design represent great challenges to the thermal equipment designer of the ground-coupled heat pump. The present model represents a mathematical and numerical technique implemented to tackle such a problem. A thermal assessment was established to estimate the total energy dissipated to the ground zone for a heat pump utilized for cooling purposes in the summer season. Comsol Multiphysics 5.4 software was used to build a 3-dimensional model to assess the thermal performance of single and double U-tube boreholes that circulate water as a thermal transfer medium. The (Heat Transfer) module has been implemented for this investigation under the (Stationary) study option. The model couples both heat conduction in solids, including tube metal, grout, and soil regions, and thermal medium fluid flow inside the U-tubes. The numerical solutions were compared for both heat exchangers at fixed borehole geometry, diameter, and depth and constant operating conditions in a steady-state mode. The double U-tube heat exchanger was tested in the parallel circuiting orientation of the U-tubes. The total mean resistance of the single U-tube borehole was higher than the half-loading double U-tube heat exchangers by 14.6%. The results also revealed that the heat transfer rate enhancement for the double U-tube was in the range of 10–14% when operating at the same fluid mass flow rate and inlet temperature for a given borehole design. Doi: 10.28991/HIJ-2022-03-02-01 Full Text: PDF
Highlights
The ground is considered one of the most important, clean, cheap, and sustainable natural energy sources on earth
Since the forties of the last century, the ground has been utilized as an energy source, energy sink, or energy storage
The ground has received significant attention from scientists to develop a proper technology to be coupled with the earth and take advantage of its privilege as a natural energy source
Summary
The ground is considered one of the most important, clean, cheap, and sustainable natural energy sources on earth. Since the forties of the last century, the ground has been utilized as an energy source, energy sink, or energy storage. The ground has received significant attention from scientists to develop a proper technology to be coupled with the earth and take advantage of its privilege as a natural energy source. The ground heat exchanger plays a vital role in the energy transmission philosophy to or from heat storage. Qualitative and quantitative efforts were focused on the thermal design of the ground vertical and horizontal heat exchanger orientations. The enhancement of the thermal performance of ground-coupled heat pumps has led to tremendous research to optimize the borehole design and grouting methods
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