The open cycle simulation of the earth air heat exchanger using computational fluid dynamic

• Published in: IOP conference series. Materials Science and Engineering 2019-05, Vol.505 (1), p.12049
• Main Authors: Manik, T U H S G, Simanjuntak, J S C, Sitorus, T B
• Format: Article
• Language: English
• Subjects: Aerodynamics; CAD; Computational fluid dynamics; Computer aided design; Fluid flow; Heat exchangers; Incompressible flow; Pipes; Simulation; Turbulent flow; Velocity
• ISSN: 1757-8981; 1757-899X
• DOI: 10.1088/1757-899X/505/1/012049

The purpose of this study is to simulate the fluid flow in a heat exchanger finned ground-air using computational fluid dynamics. The simulation carried out under the velocity of 1 m/s, 2 m/s, and 3 m/s; and the condition of the pipe was restricted to a depth of 2 m from the ground. The simulation was also used for flow, transient, incompressible, turbulent, and three dimensions. The materials that used for the Earth-Air Heat Exchanger (EAHE) is an iron pipe, which has dimension of 3 inches, 2 mm thick pipe, pipe length of 1.2 m and arranged directly with radial fin 17 with each distance of 2 cm and has a thickness of 2 mm, then the pipe was connected with PVC pipe with a length of 2.5 m. The temperature average of the outlet air of the 3D simulation result, using ANSYS, and was obtained 14.52°C inlet air velocity of 1 m/s, at 25.81°C is 2 m/s, and at 25.65°C is 3 m/s. The experimental result show that 26.37°C for the velocity of 1 m/s, at 25.92°C is 2 m/s, and at 25.72 °C is 3 m/s. The average COP value of 0.492, the simulation result for the velocity is 1 m/s, at 0.921 is 2 m/s, and at 0.377 is 3 m/s. Meanwhile, for the experimental result of 0.496 is 1 m/s, at 0887 is 2 m/s, and the velocity of 3 m/s is 0.372.