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A house has a composite wall of plywood, fiberglass insulation, and plaster board, as indicated in Fig. On a cold winter day the convection heat transfer coefficients are ho 60 W/m2.K and h= 30 W/m2.K. The total wall surface area is 350 m2. If Kp= 0.17 W/m.K, K= 0.036 W/m.K, and K: = 0.12 W/m.K. Glass fiber blanket (28 kg/m), k, Plaster board, k, Plywood siding, k, Inside Outside h, T- 20°C h T=-15°C 11 111 10 mm 100 mm- +-20 mm A. What are the main assumptions? B. Draw the thermal circuit representing conduction through the composite wall ? C. Drive an expression in symbol form for the total thermal resistance of the composite wall, including inside and outside convection effects for the preseribed conditions. D.Determine the total heat rate through the wall. E. What is the controlling resistance that determines the heat rate through the wall?

A house has a composite wall of plywood, fiberglass insulation, and plaster board, as indicated in Fig. On a cold winter day the convection heat transfer coefficients are ho 60 W/m2.K and h= 30 W/m2.K. The total wall surface area is 350 m2. If Kp= 0.17 W/m.K, K= 0.036 W/m.K, and K: = 0.12 W/m.K. Glass fiber blanket (28 kg/m), k, Plaster board, k, Plywood siding, k, Inside Outside h, T- 20°C h T=-15°C 11 111 10 mm 100 mm- +-20 mm A. What are the main assumptions? B. Draw the thermal circuit representing conduction through the composite wall ? C. Drive an expression in symbol form for the total thermal resistance of the composite wall, including inside and outside convection effects for the preseribed conditions. D.Determine the total heat rate through the wall. E. What is the controlling resistance that determines the heat rate through the wall?

Introduction to Chemical Engineering Thermodynamics
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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Q.2: (50 Pt.) A house has a composite wall of plywood, fiberglass insulation, and plaster board, as indicated in Fig. On a cold winter day the convection heat transfer coeflicients are ho= 60 W/m?.K and h= 30 W/m².K. The total wall surface area is 350 m? . If Kp= 0.17 W/m.K, KB= 0.036 W/m.K, and K,= 0.12 W/m.K. Glass fiber blanket (28 kg/m), k, Plaster board, k, Plywood siding, k, Inside Outside h, T = 20°C h T= -15C 11 11 10 mm 100 mm 20 mm A. What are the main assumptions? B. Draw the thermal circuit representing conduction through the composite wall ? C. Drive an expression in symbol form for the total thermal resistance of the composite wall, including inside and outside convection effects for the prescribed conditions. D.Determine the total heat rate through the wall. E. What is the controlling resistance that determines the heat rate through the wall?
Transcribed Image Text:Q.2: (50 Pt.) A house has a composite wall of plywood, fiberglass insulation, and plaster board, as indicated in Fig. On a cold winter day the convection heat transfer coeflicients are ho= 60 W/m?.K and h= 30 W/m².K. The total wall surface area is 350 m? . If Kp= 0.17 W/m.K, KB= 0.036 W/m.K, and K,= 0.12 W/m.K. Glass fiber blanket (28 kg/m), k, Plaster board, k, Plywood siding, k, Inside Outside h, T = 20°C h T= -15C 11 11 10 mm 100 mm 20 mm A. What are the main assumptions? B. Draw the thermal circuit representing conduction through the composite wall ? C. Drive an expression in symbol form for the total thermal resistance of the composite wall, including inside and outside convection effects for the prescribed conditions. D.Determine the total heat rate through the wall. E. What is the controlling resistance that determines the heat rate through the wall?
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