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 · ft² · °F (1869 W/m² · K), (c) U, i 286.4 btu/h · ft2 .°F (1626 W/m² - K)

Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
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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
Transcribed Image 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
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