Question

Problem X3-5, Heat Transfer, Spring 2018 A single-pass, double-tube counterflow heat exchanger will be used to heat a 0.14 kg/s stream of water nowing in the 12-mm diameter inside tube. The water in the inside tube enters the heat exchanger at 25 C. The water will be heated with a 0.12 kg/s m of hot water flowing in the annulus between the inside and outside tube that enters the heat exchanger at 80°C. UP the hot and cold streams, and the heat exchange 128 W/m K for the heat transfer between r is 3.6 m long. Use the NTU method to find the temperature of each stream of water when it (answers: the cold stream is heated from 25 48.4°C, and exits the heat exchanger cold stream is heated from 25 C to 48.4 C, and the hot stream is coole from 80°C to 52.8°C).

Answer 1

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