The experimental and simulation study of an earth-air heat exchanger in Medan city

Abstract

Abstract The earth-air heat exchanger (EAHE) is an air-conditioning device utilizing a heat exchange between the air in the room and the soil. This paper purpose to determine the EAHE performance with experimentally and simulation. The simulation used are transient CFD, turbulent and 3-dimensional. The ambient air was distributed to the pipes with the different velocity of 2 m/s and 3 m/s. It was found that the earth-air heating exchanger effectiveness at air velocity 2 m/s for testing was 0.84 while for theoretical of 0.97. The coefficient of performance (COP) of EAHE increase from 1.341 to 1.761 when the increasing air velocity from 2 m/s to 3 m/s. The COP value also increases from 1.473 to 2.278 at the increasing of air velocity from 2 m/s to 3 m/s. The average of the COP value of the simulation result of the incoming air velocity was 1.99422 for velocity 3 m/s and 1.41426 for the velocity 2 m/s. For the average effectiveness of the simulation result obtained 1.00074 for the velocity of 3 m/s and 0.86100 for velocity 2 m/s.