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Old 02-02-2011
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The heat transfer based on most refrig. Hx. is designed for a 15 F. degree 'approach' and are based on a maximum water inlet temp of 85 F. deg. (outlet @ 100 deg. F). Once you go beyond the 85°F inlet and exceed the 15° 'approach' the thermal transfer becomes VERY inefficient. ... and you need a Much larger than normal Hx and a Much higher flow of 'cooling' water to do the transfer. Simple heat transfer calculations and normal practices.
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