Abstract
Heat exchangers in combination with geothermal heat pumps (GHP) have been growing in HVAC and sanitary applications, as well as associated research. Therefore, in this work, a Composite Geothermal Heat Exchanger (CGHE) and a Horizontal Geothermal Heat Exchanger (HGHE) were designed and fabricated Through experimental tests and simulation in ANSYS-CFX, the behavior of the temperature of the refrigerant fluid inside the exchangers was compared. The geometry of the CGHE was based on a Vertical Geothermal Heat Exchanger (VGHE) with the installation depth of an HGHE. Water at different temperatures was used as the cooling fluid with a mass flow equal to 0.26 L/s for the experimental tests and simulations in ANSYS-FLUENT for both the CGHE and HGHE. The CGHE and HGHE were installed within a volume of 3.25 m3 of ground. The experiments and simulations in ANSYS-CFX showed that the refrigerant fluid inside the CGHE exhibit a greater use of geothermal energy because it increases and reduces the temperature of the refrigerant more quickly compared to the HGHE.
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