Saturated steam at 100°C is condensing on shell side of a shell and tube heat exchanger. The cooling water enters the tube at 30°C and leaves at 70°C. Calculate arithmetic mean temperature difference in counter flow arrangement.
50°C
Condensing steam remains at 100°C. The two end temperature differences are 100−30=70°C and 100−70=30°C. Their arithmetic mean is (70+30)/2=50°C.
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