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A counterflow double-pipe heat exchanger is employed to heat 25 kg/s of water from 20 to 40 C with a hot oil at 200 C.

A counterflow double-pipe heat exchanger is employed to heat 25 kg/s of water from 20 to 40° C with a hot oil at 200° C. The overall heat-transfer coefficient is 275 W/m² · °C. Determine effectiveness and NTU for exit oil temperatures of 190, 180, 140, and 80°C.

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