A plastic (k = 0.5 W/m*K) pipe carries a coolant at –35C with a heat-transfer coefficient of 300 W/m^2*K. The pipe ID is 3 cm and the OD is 4 cm. The exterior pipe surface is exposed to air at 25C with a heat-transfer coefficient of 20 W/m^2K. Radiative heat transfer may be neglected in this problem.Ans. (a) 114 W/m of pipe. (b) –20.5C.(a) Calculate the rate of heat transfer to the coolant per meter of pipe length.(b) Calculate the temperature of the exterior pipe surface.(c) It is desired to reduce the rate of heat transfer by 90%. Will a 2 cm layer of magnesia insulation be sufficient for this purpose?

Part (a)Inner radius of the pipe is, r1 = 3/2 cm = 1.5x102 mOuter radius of the pipe is, r2 = 4/2 cm…

Answered: A plastic (k = 0.5 W/m*K) pipe carries…

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

Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Chapter1: Introduction

Section: Chapter Questions

Problem 1.1P

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A plastic (k = 0.5 W/m*K) pipe carries a coolant at –35C with a heat-transfer coefficient of 300 W/m^2*K. The pipe ID is 3 cm and the OD is 4 cm. The exterior pipe surface is exposed to air at 25C with a heat-transfer coefficient of 20 W/m^2K. Radiative heat transfer may be neglected in this problem.

Ans. (a) 114 W/m of pipe. (b) –20.5C.
(a) Calculate the rate of heat transfer to the coolant per meter of pipe length.

(b) Calculate the temperature of the exterior pipe surface.
(c) It is desired to reduce the rate of heat transfer by 90%. Will a 2 cm layer of magnesia insulation be sufficient for this purpose?

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why didnt you convert to kelvin with temperature.

this confuses me because h has the units kelvin

could you please plug in units and show me how they cancel?

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