A cross-flow heat exchanger consists of 80 thin walled tubes of 3-cm diameter located in a duct of 1 m × 1 m cross section. There are no fins attached to the tubes. Cold water (c_p = 4180 J/kg · K) enters the tubes at 18°C with an average velocity of 3 m/s, while hot air (c_p = 1010 J/kg · K) enters the channel at 130°C and 105 kPa at an average velocity of 12 m/s. If the overall heat transfer coefficient is 130 W/m² · K, determine the outlet temperatures of both fluids and the rate of heat transfer.

Transcribed Image Text:

Hot air 130°С 105 kPa 12 m/s 1 m 1 m ооо Water 18°C 3 m/s