Design of an Earth Air Heat Exchanger (EAHE) for Climatic Condition of Chennai, India



G.N. Tiwari*, Vikram Singh, Poonam Joshi, Shyam , Arjun Deo, Prabhakant , Agam Gupta
Centre for Energy Studies, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India.


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© 2014 Tiwari et al.

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: https://creativecommons.org/licenses/by/4.0/legalcode. This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

* Address correspondence to this author at the Centre for Energy Studies, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India; Tel: +91 11 26591258; Fax: +91 11 26592208; E-mail:gntiwari@ces.iitd.ernet.in


Abstract

In the present work the ground temperature has been validated for climatic condition of Sriperumbudur near Chennai, India to evaluate thermal conductivity and diffusivity of the soil. For the evaluated thermal conductivity of the soil, an EAHE has been designed for a given dimension of room with optimized values of number of air changes, length of pipe, radius of pipe and depth at which heat exchanger to be installed below the surface of the earth. It has been observed that there is a decrease of 5 – 6 °C in the outlet air temperature in summer for a number of 5 air changes with 0.10 m and 21 m optimized diameter and length of pipe respectively.

Keywords: Earth air heat exchanger, constant ground temperature, geothermal energy.