• Kamal Kumar Agrawal
• Sandeep Parmar
• Ghanshyam Das Agrawal
• Rohit Misra
• Mahendra Salvi

Building cooling and heating consume around one-third of total primary energy consumption.Renewable and passive systems can reduce the building cooling and heating energy demand. Earth air tunnel heat exchanger (EATHE) is one of the promising passive techniques which can serve the purpose of space heating and cooling using constant temperature of underground soil. It is a promissing passive technique for space heating and cooling butit required long pipes and largeland area for installation of pipes. Various studies have been conducted in last few decades to investigate the various parameters that may reduce the length of pipe and land area requirement. In this article, the effect of thermal properties of soilon the performance of earth air heat exchanger systems have been reviewed.This review article shows that length of pipe and land area requirement for EATHE pipe installation can be substantially reduced by using thermally enhanced backfilling material at the vicinity of the EATHE pipe.

EATHE system, thermal properties of soil, pipe length, land area requirement, thermally-enhanced backfilling materials.

"Effect of Thermally-Enhanced Backfilling Materials on the Performance of Earth-Air- Tunnel-Heat-Exchanger System: A Review", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.5, Issue 9, page no.333-339, September-2018, Available :http://www.jetir.org/papers/JETIRB006062.pdf

"Effect of Thermally-Enhanced Backfilling Materials on the Performance of Earth-Air- Tunnel-Heat-Exchanger System: A Review", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.5, Issue 9, page no. pp333-339, September-2018, Available at : http://www.jetir.org/papers/JETIRB006062.pdf