Question

A counter flow DPHX will be used to heat a 0.40 kg/s stream of water flowing in the inner tube. The water in the inner tube enters the heat exchanger at 10°C. The water will be heated with a 0.70 kg/s stream of hot water flowing in the annulus that enters the heat exchanger at 70°C. UP = 250 W/m\cdot K for the heat transfer between the streams, and the heat exchanger is 8 m long. a) Find the rate of heat transfer in the heat exchanger and compute the temperature of each stream of water when it exits the heat exchanger. b) Assume $x = 0$ where the hot water enters the heat exchanger, and find the temperature of each stream at $x = 5$ m.

          A counter flow DPHX will be used to heat a 0.40 kg/s stream of water flowing in the
inner tube. The water in the inner tube enters the heat exchanger at 10°C. The water
will be heated with a 0.70 kg/s stream of hot water flowing in the annulus that enters
the heat exchanger at 70°C. UP = 250 W/m\cdot K for the heat transfer between the
streams, and the heat exchanger is 8 m long.
a) Find the rate of heat transfer in the heat exchanger and compute the temperature
of each stream of water when it exits the heat exchanger.
b) Assume $x = 0$ where the hot water enters the heat exchanger, and find the
temperature of each stream at $x = 5$ m.

A counter flow DPHX will be used to heat a 0.40 kg/s stream of water flowing in the
inner tube. The water in the inner tube enters the heat exchanger at 10°C. The water
will be heated with a 0.70 kg/s stream of hot water flowing in the annulus that enters
the heat exchanger at 70°C. UP = 250 W/m·K for the heat transfer between the
streams, and the heat exchanger is 8 m long.
a) Find the rate of heat transfer in the heat exchanger and compute the temperature
of each stream of water when it exits the heat exchanger.
b) Assume x = 0 where the hot water enters the heat exchanger, and find the
temperature of each stream at x = 5 m.

Added by Juan J.

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