TM-5-855-4
5-5. Sample problems.
This paragraph illustrated by problems the use of equations for heat sinks and discusses the relative
merits of the heat-absorbing capacity of the surrounding rock as a function of time and equivalent
radius.
a. Problem 1.
(1) Assume the heat-rejection rate for an underground installation during an emergency period
is 2 MBtuh and that the installation must be self-sustaining for a period of 10 days. The reservoir
temperature is initially 520 F and the highest water temperature permissible is 1000 F. Determine the
3
necessary lengths of reservoirs for the cross sections given in table 5-1 with water at 62.42 lb/ft density, 1
specific heat, and .0392 ft2/h diffusivity.
55
Previous Page
