A house has a composite wall made of wood, fiberglass insulation, and gypsum boards. On a cold winter day, the external and internal heat transfer coefficients are 60 and 30 W/m²°C, respectively. The total surface area is 350 m². (a) Determine the total heat loss through the wall: (b) if the wind were blowing strongly, increasing the external coefficient to 300 W/m²°C, determine the percentage increase in heat loss; (c) what is the thermal resistance determining the total heat flow through the wall?
A house has a composite wall made of wood, fiberglass insulation, and gypsum boards. On a cold winter day, the external and internal heat transfer coefficients are 60 and 30 W/m²°C, respectively. The total surface area is 350 m². (a) Determine the total heat loss through the wall: (b) if the wind were blowing strongly, increasing the external coefficient to 300 W/m²°C, determine the percentage increase in heat loss; (c) what is the thermal resistance determining the total heat flow through the wall?
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 house has a composite wall made of wood, fiberglass insulation, and gypsum boards. On a cold winter day, the external and internal heat transfer coefficients are 60 and 30 W/m²°C, respectively. The total surface area is 350 m². (a) Determine the total heat loss through the wall: (b) if the wind were blowing strongly, increasing the external coefficient to 300 W/m²°C, determine the percentage increase in heat loss; (c) what is the thermal resistance determining the total heat flow through the wall?
Transcribed Image Text:plasterboard, k
inner 1
side
h₂, Ti= 20°C
111
fiberglass blanket
(28 kg/m³), kfv
10 mm 100 mm-
Ly
A
L
14
wood, kt
outer
side
he, To
:-15°C
111
-20 mm
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