A review on modelling, experimental analysis and parametric effects of earth-air heat exchanger

Earth-air heat exchanger (EAHE) is one of the energy-efficient technology that uses earth-stored heat (earth's subsurface heat) for heating or cooling the buildings and thereby protect the environment. Since this is the ability of the earth that it maintains a constant temperature at a certain depth because of huge heat storage. This constant temperature is higher than the ambient temperature in winter and lower than the ambient temperature in summer. The EAHE system is basically a pipe of different materials buried in the earth at a certain depth through which the fresh air circulates. The EAHE draws heat from the earth's subsurface to heat space in the winter. Similarly, in the summer, EAHE discharges heat to the earth to cool space. The fundamental goal of this paper is to review the previous work related to the EAHE system. Result of more recent related works has been comparing, discussed, and included in this paper. After an intensive review of this article, it has concluded that the proper design of the earth-air heat exchanger gives sufficient cooling and heating for space and offers a reduction in energy consumption, CFC emission. Therefore, this review article provides a piece of useful information to scholars interested in researching passive cooling/heating using the EAHE system.