Table 83 Wasteheat sources in the lowtemperature range

Source

Temperature (°F)

Process steam condensate 130-190 Cooling water from:

Furnace doors 90-130

Bearings 90-190

Welding machines 90-190

Injection molding machines 90-190

Annealing furnaces 150-450

Forming dies 80-190

Air compressors 80-120

Pumps 80- 190

Internal combustion engines 150-250

Air conditioning and 90-110

refrigeration condensers

Liquid still condensers 90-190 Drying, baking, and curing ovens 200-450

Hot-processed liquids 90-450

Hot-processed solids 200-450

where t = time, hr k = thermal conductivity, Btu-ft/hr ft2 °F A = surface area dT dx x = C

= temperature gradient at the surface sion due to Rummel4:

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