STUDYING SOME OF THE EARTH TUBE HEAT EXCHANGER AND SOILS PROPERTIES

Hatem, M. H.; El-Kilani, R.; Schick, Matthias; Elshemy, H. R.

doi:10.21608/mjae.2014.98423

STUDYING SOME OF THE EARTH TUBE HEAT EXCHANGER AND SOILS PROPERTIES

Document Type : Original Article

Authors

¹ Prof., Agric. Eng. Dept., Fac. of Agric., Cairo Univ., Egypt.

² Asisst. Prof, Agric. Eng. Dept., Fac. of Agric., Cairo Univ., Egypt.

³ Prof., Institute of Agric. Eng, Switzerland

⁴ Assist. Lecturer, Agric. Eng. Dept., Fac. of Agric., Cairo Univ., Egypt.

10.21608/mjae.2014.98423

Abstract

In this paper the composition and thermal property of soil and pipe of earth tube heat exchanger are discussed. The main factors that impact the soil thermal properties and several commonly-used pipe materials are studied. The impact of soil thermal conductivity and pipe thermal conductivity on the soil temperature field around the buried pipe is very important. As an energy-saving and environment friendly air conditioning technology, earth tube heat exchanger has been utilized wildly for some years. It is necessary to study in detail soil properties and pipe materials for utilizing earth tube heat exchanger successfully. The thermal conductivity for sandy soil is higher than sandy clay loam soil and heat exchange rate between air in metal pipe and soil achieve more 5 time for PVC pipe and wet soil with 15% moisture achieve heat exchange rate to air in pipe by 5% more dry soil.

References

Bose J E, Parker J D. 1983, Ground -coupled heat pump research [J]. ASHRAE Trans, 89(2):375-390.

Calvin W. Rose. 2004. An Introduction to the Environmental Physics of Soil, Water and Watersheds . 2nd ed. Gordon and Breach Sc. Publishers. (ISBN-13: 9780521536790)

Dunren Guo. 1965. Physics and mathematics method [M]. Beijing: People Education Press, 40-50.(In Chinese)ESL-IC-06-11-304

Guozhong Wu, Jiulong Zhang, Yingjie Wang. 2003, Heat transfer calculation of pipeline buried underground [M]. Harbin: Harbin Institute Technology University Press, 76-84.(In Chinese)

Holaman, j, p.1986 . Heat transfer. 6nd ed. Gordon and Breach Sc. Publishers. (ISBN-13: 9780521536790)

Hongming Fan, Shouxia Shi, Zhongyi He. 1999. The temperature field analysis of the pipeline buried underground directly [J]. Transaction of Harbin Architecture University, 32(5):60-65.(In Chinese)

Michael, J and Howard, N 2007. Fundamentals of engineering termodynamics . Int. J. Food Eng. 3, 1–18.

Randall J. Schaetzl, Sharon Anderson Color. 2005 . Soils .5th ed.. p. 448. (ISBN-13: 9780521812016)

Sabau S S, Tao Y X, Liu G, Vidhuvalavan G. 1997. Effective thermal conductivity for anisotropic granular porpous media using fractal concepts. ASME Proceedings of 32nd National Heat Transfer Conference [C]. New York: ASME Publication.