A prospective client attending the forum has requested consultancy services. You have requested the specifications of the system and the client informs you that the exterior walls of a building are a composite consisting of 12mm thick plaster board, 52mm thick urethane foam, and 12mm thick soft wood. On a typical winter day, the outside and inside air temperatures are -14°C and 23°C respectively. The outer and inner convection coefficients are 15W/mK and 5W/mK respectively. c) Calculate the heating loss for a 1m² section of the wall. d) What is the heating loss if the composite wall is replaced by a window consisting of two 3.5mm thick glass panes separated by a 5mm thick stagnant air gap. State simplifying assumptions. Use the following thermal conductivity values: Plaster board, kp = 0.17 W/mK Urethane foam, k = 0.026 W/mK Wood, Kw = 0.12 W/mK Glass, kg = 1.4 W/mK Air, ka = 0.0263 W/mK

A prospective client attending the forum has requested consultancy services. You have requested the specifications of the system and the client informs you that the exterior walls of a building are a composite consisting of 12mm thick plaster board, 52mm thick urethane foam, and 12mm thick soft wood. On a typical winter day, the outside and inside air temperatures are -14°C and 23°C respectively. The outer and inner convection coefficients are 15W/mK and 5W/mK respectively. c) Calculate the heating loss for a 1m² section of the wall. d) What is the heating loss if the composite wall is replaced by a window consisting of two 3.5mm thick glass panes separated by a 5mm thick stagnant air gap. State simplifying assumptions. Use the following thermal conductivity values: Plaster board, kp = 0.17 W/mK Urethane foam, k = 0.026 W/mK Wood, Kw = 0.12 W/mK Glass, kg = 1.4 W/mK Air, ka = 0.0263 W/mK

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 prospective client attending the forum has requested consultancy services. You have requested the
specifications of the system and the client informs you that the exterior walls of a building are a
composite consisting of 12mm thick plaster board, 52mm thick urethane foam, and 12mm thick soft
wood. On a typical winter day, the outside and inside air temperatures are -14°C and 23°C respectively.
The outer and inner convection coefficients are 15W/mK and 5W/mK respectively.
c) Calculate the heating loss for a 1m² section of the wall.
d) What is the heating loss if the composite wall is replaced by a window consisting of two 3.5mm
thick glass panes separated by a 5mm thick stagnant air gap. State simplifying assumptions.
Use the following thermal conductivity values:
Plaster board, kp = 0.17 W/mK
Urethane foam, kf = 0.026 W/mK
Wood, Kw = 0.12 W/mK
Glass, kg = 1.4 W/mK
Air, ka = 0.0263 W/mK

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