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All Journal Scientific Journal of Mechanical Engineering Kinematika
Dinar Kurniawan
Gadjah Mada University
Automotive Engineering Energy Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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PENGARUH PENGGUNAAN GRAPHENE METAL FOAM TERHADAP KOEFISIEN PERPINDAHAN KALOR PADA SISTEM CLOSED-LOOP GEOTHERMAL Dinar Kurniawan; Indro Pranoto; Khasani; Budi Santoso Wibowo
Scientific Journal of Mechanical Engineering Kinematika Vol 11 No 2 (2026): SJME Kinematika December 2026
Publisher : Mechanical Engineering Department, Faculty of Engineering, Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/sjmekinematika.v11i2.899

Abstract

This study presents an experimental investigation into the effect of graphene metal foam on the heat-transfer performance of a closed-loop geothermal system. The system uses a sealed pipe configuration to circulate a low-temperature working fluid that extracts heat from the subsurface reservoir via conductive heat transfer and transports it to the surface. In this work, the system is modelled using a coaxial heat exchanger heated by an oven to simulate the geothermal reservoir. Two structural specifications of graphene-coated Ni-Fe alloy foam, 85% (90 PPI) and 90% (110 PPI), were employed and tested at a constant flow rate of 0.3 LPM under varying heat source temperatures of 170, 200, and 230 °C. The results show that both foam configurations achieved their highest performance at 230 °C. The overall heat transfer coefficient () reached 749.48 W/m².K for 85% (90 PPI) porosity and 462.78 W/m².K for 90% (110 PPI) porosity, significantly higher than that of a plain tube (103.88 W/m².K). These findings demonstrate that incorporating graphene metal foam, particularly at 85% porosity, effectively enhances heat-transfer performance in closed-loop geothermal systems.
Co-Authors Budi Santoso Wibowo Indro Pranoto Khasani