(a) If the inlet temperature of water flowing through the pipe is T; = 90 °C, what is the heat lossper unit length of pipe in proximity to the inlet? The temperature of the pipe T¡ may be assumedto be that of the inlet water.(b) If the difference between the inlet and outlet temperatures of water flowing through a 100-m-long pipe is not to exceed 5°C, estimate the minimum allowable flow rate m . The effect ofsmall temperature drop along the pipe on the heat rate may be ignored. The specific heat of thewater is c = 4207 J/kg-K. Hot water is transported from a cogeneration power station to commercial and industrial usersthrough steel pipes of diameter D=150 mm, with each pipe centered in concrete (k= 1.4 W/m-K)of square cross section (w = 300 mm). The outer surfaces of the concrete are exposed to ambientair for which To = 0°C and h = 25 W/m²-K.Concrete, k --T,AirT, hWaterT;, m

Data given- D= 150 mm = 0.15 m R= 75 mm = 0.075 m K = 1.4 W/mK w= 0.3 m T∞ = 0°C h= 25 w/m2k Ti=…

Hot water is transported from a cogeneration power station to commercial and industrial users through steel pipes of diameter D=150 mm, with each pipe centered in concrete (k= 1.4 W/m-K) of square cross section (w = 300 mm). The outer surfaces of the concrete are exposed to ambient air for which To = 0°C and h = 25 W/m²-K.

Hot water is transported from a cogeneration power station to commercial and industrial users through steel pipes of diameter D=150 mm, with each pipe centered in concrete (k= 1.4 W/m-K) of square cross section (w = 300 mm). The outer surfaces of the concrete are exposed to ambient air for which To = 0°C and h = 25 W/m²-K.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Question

(a) If the inlet temperature of water flowing through the pipe is T; = 90 °C, what is the heat loss
per unit length of pipe in proximity to the inlet? The temperature of the pipe T¡ may be assumed
to be that of the inlet water.
(b) If the difference between the inlet and outlet temperatures of water flowing through a 100-m-
long pipe is not to exceed 5°C, estimate the minimum allowable flow rate m . The effect of
small temperature drop along the pipe on the heat rate may be ignored. The specific heat of the
water is c = 4207 J/kg-K.

Hot water is transported from a cogeneration power station to commercial and industrial users
through steel pipes of diameter D=150 mm, with each pipe centered in concrete (k= 1.4 W/m-K)
of square cross section (w = 300 mm). The outer surfaces of the concrete are exposed to ambient
air for which To = 0°C and h = 25 W/m²-K.
Concrete, k -
-T,
Air
T, h
Water
T;, m

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