Water flowing at a rate of 12.6 kg/s is to be cooled from 90 to 65?C by
Question:
Water flowing at a rate of 12.6 kg/s is to be cooled from 90 to 65?C by means of an equal flow rate of cold water entering at 40?C. The water velocity with the such that the overall coefficient of heat transfer U is 2300 W/(m2 K). Calculate the square meters of heat-exchanger surface needed for each of the following arrangements:(a) Parallel flow,(b) Counterflow,(c) A multi-pass heat exchanger with the hot water making one pass through a well-baffled shell and the cold water making two passes through the tubes, and(d) A crossflow heat exchanger with both sides unmixed.GIVENWarm water cooled by cold water in a heat exchangerBoth flow rates (mc = mw) = 12.6 kg/sWater temperaturesTh,in = 90?CTh,out = 65?CTc,in = 40?COverall heat transfer coefficient (U) = 2300 W/(m2 K)ASSUMPTIONSThe specific heat isconstant
Transcribed Image Text:
Wam water Trout - 65°C Thn- 90°C Tạn- 40°C Cold water (a) Wam water Tnan Thout Tain Cold water (b) Warm Wam water water Trn Trin Cold water Cold water Tain Thout Tnout (c) (d)
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