Heat Transfer in Steam Heater. Water at an average of 70°F is flowing in a 2-in. steel pipe, schedule 40. Steam at 220°F is condensing on the outside of the pipe. The convective coefficient for the...

Extracted text: Heat Transfer in Steam Heater. Water at an average of 70°F is flowing in a 2-in. steel pipe, schedule 40. Steam at 220°F is condensing on the outside of the pipe. The convective coefficient for the water inside the pipe is h = 500 btu/h · ft² . °F and the condensing steam coefficient on the outside is h = 1500. (a) Calculate the heat loss per unit length of 1 ft of pipe using resistances. (b) Repeat using the overall U; based on the inside area A;. (c) Repeat using U,. Ans. (a) q = 26 710 btu/h (7.828 kW), (b) U; = 329.1 btu/h ft? . °F (1869 W/m2 - K), (c) U. = 286.4 btu/h ft2.°F (1626 W/m2 · K) i