7.1.3 Computation: Optimum Pipe Insulation Thicknesses A network of various hot pipes is to be insulated against heat loss. A given insulation with thermal conductivity K (constant) is considered for all lines, and is wrapped around each pipe to form an annular cylinder. The temperature of the pipe outer wall is considered equal to the insulation inner wall temperature and is equal everywhere in the system; this is T^ in the Figure A-l below. The temperature of the insulation is taken to be the
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