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This article in JEQ

  1. Vol. 2 No. 4, p. 458-462
     
    Received: Oct 20, 1972
    Published: Oct, 1973


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doi:10.2134/jeq1973.00472425000200040011x

An Analytical Consideration of Undersoil Heating1

  1. George J. Trezek and
  2. Dennis Obeng1

Abstract

Abstract

The feasibility of using reject heat from electrical power plants for undersoil heating has been analytically considered. Since soil is a poor thermal conductor, a suitable arrangement of undersoil pipes is required in order to achieve a somewhat uniformly elevated soil temperature. Two-dimensional steady temperature profiles in soil resulting from a warm water pipe having a wall temperature of 37.8C were computed for several pipe configurations and surface heat transfer coefficients of 1.36 and 136 cal·sec−1·m−2·°C−1. Values of heat transfer on the order of 5 cal·sec−1·m−1 can be obtained. Calculations indicate that in order to apply this technique for the utilization of significant portions of reject heat, the system must be viewed in terms of an agricultural power plant complex encompassing large quantities of land.

2 Associate Professor and African Graduate Fellow (AFGRAD), Department of Mechanical Engineering, University of California, Berkeley 94720.

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