Under the present international energy situation, it is necessary to develop new and renewable energies which will substitute fossil energies, and the government has a big interest in development and supply of new energies, and it also encourages a research to keep pace with the advanced countries. ...
Under the present international energy situation, it is necessary to develop new and renewable energies which will substitute fossil energies, and the government has a big interest in development and supply of new energies, and it also encourages a research to keep pace with the advanced countries. Among new and renewable energies, the geothermal energy is a new energy source that is not only inexhaustible but also eco-friendly. The most common example using geothermal energy is ground heat exchanger in a geothermal heat pump system (GHP). Up to the present this heating system is popularly constructed in many advanced countries including the USA, and this construction is increasing gradually in Korea, too.
The heat exchanger according to its establishing method can be classified into four modes such as a vertical mode, a horizontal mode, a surface water mode, and an underground water mode. A closed-loop vertical ground heat exchanger is widely used in Korea because of the installing site problem.
In this study, a series of numerical analysis was accomplished on the thermal performance and sectional efficiency of a closed-loop vertical ground heat exchanger (U-loop) in a geothermal heat pump system (GHP) involving soil and grout. ABAQUS which is finite element analysis program was employed to evaluate the temperature distribution on the cross section of the U-loop system involving HDPE pipe/grout/formation. And It was compared the sectional efficiency between the conventional U-loop and a new latticed HDPE pipe system. Especially, the latticed pipe is equipped with a thermal insulation zone in order to reduce thermal interference between the inflow pipe and the outflow pipe. Also, analysis of thermal stress was evaluated in this numerical analysis along with ABAQUS.
FLUENT which is 3-D finite volume analysis program that can analyze coupled system between heat transfer and fluid flow, was used in simulating the operating process of the closed-loop vertical ground heat exchanger by considering the effect of the thermal properties of grout, rate of circulation pump, distance between the inflow pipe and the outflow pipe, and the effectiveness of the latticed HDPE pipe system. Also, series of analysis about heat exchanger in tunnel(Energy textile) was accomplished.
Under the present international energy situation, it is necessary to develop new and renewable energies which will substitute fossil energies, and the government has a big interest in development and supply of new energies, and it also encourages a research to keep pace with the advanced countries. Among new and renewable energies, the geothermal energy is a new energy source that is not only inexhaustible but also eco-friendly. The most common example using geothermal energy is ground heat exchanger in a geothermal heat pump system (GHP). Up to the present this heating system is popularly constructed in many advanced countries including the USA, and this construction is increasing gradually in Korea, too.
The heat exchanger according to its establishing method can be classified into four modes such as a vertical mode, a horizontal mode, a surface water mode, and an underground water mode. A closed-loop vertical ground heat exchanger is widely used in Korea because of the installing site problem.
In this study, a series of numerical analysis was accomplished on the thermal performance and sectional efficiency of a closed-loop vertical ground heat exchanger (U-loop) in a geothermal heat pump system (GHP) involving soil and grout. ABAQUS which is finite element analysis program was employed to evaluate the temperature distribution on the cross section of the U-loop system involving HDPE pipe/grout/formation. And It was compared the sectional efficiency between the conventional U-loop and a new latticed HDPE pipe system. Especially, the latticed pipe is equipped with a thermal insulation zone in order to reduce thermal interference between the inflow pipe and the outflow pipe. Also, analysis of thermal stress was evaluated in this numerical analysis along with ABAQUS.
FLUENT which is 3-D finite volume analysis program that can analyze coupled system between heat transfer and fluid flow, was used in simulating the operating process of the closed-loop vertical ground heat exchanger by considering the effect of the thermal properties of grout, rate of circulation pump, distance between the inflow pipe and the outflow pipe, and the effectiveness of the latticed HDPE pipe system. Also, series of analysis about heat exchanger in tunnel(Energy textile) was accomplished.
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