Numerical approach to predict the outlet temperature of earth-to-air-heat-exchanger. (1st March 2021)

• Record Type: Journal Article
• Authors: Hamdane, Samia; Mahboub, Chawki; Moummi, Abdelhafid
• Is Part Of: Thermal science and engineering progress. Volume 21(2021)
• Publication Date: 2021-03-01
• Subjects: Earth/Air heat exchanger -- Modelling -- Outlet air temperature -- Heat conduction; Heat engineering -- Periodicals; Heat engineering; Thermodynamics; Periodicals; 621.402
• DOI: 10.1016/j.tsep.2020.100806
• Languages: English
• ISSNs: 2451-9049

Abstract

Highlights: Constants soil radius and inlet temperature are limited hypotheses for EAHE studies. Using only radial heat conduction equation in soil around pipe is incomplete solution. It has been proved that at night axial heat flux reach 80% from total heat conduction. Hypotheses in this study are more logic in describing the heat exchange phenomena. Present model results give good agreement with EAHE experiments at night and daytime. Abstract: It is usually assumed that the heat conduction in the soil surrounding the pipe of an EAHE is one-dimensional in the radial direction which allows one to simplify the mathematics and eventually to obtain an analytical or semi-analytical solution to the problem. For the simulation model proposed in this work, the complete axisymmetric heat conduction equation is solved in the soil domain. The results of the simulation in terms of the air temperature were validated using experimental data available in the literature where they demonstrate an overall superiority over the other models that used one-dimensional heat conduction equations in the soil domain.