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hw06 PDF

This document provides instructions for three homework problems involving computing thermal properties of walls. The first problem asks students to design a wall with up to five materials and calculate its U-factor using HVAC Tools software. The second problem involves calculating the overall thermal resistance of a wall made of brick, concrete block, and plaster with an air gap. The third problem tasks students with finding the overall heat transfer coefficient of a framed wall with brick, insulation, and a given wind velocity.

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shum kenneth
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356 views2 pages

hw06 PDF

This document provides instructions for three homework problems involving computing thermal properties of walls. The first problem asks students to design a wall with up to five materials and calculate its U-factor using HVAC Tools software. The second problem involves calculating the overall thermal resistance of a wall made of brick, concrete block, and plaster with an air gap. The third problem tasks students with finding the overall heat transfer coefficient of a framed wall with brick, insulation, and a given wind velocity.

Uploaded by

shum kenneth
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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Computer Example

4" Face brick 4" common brick

Heat flow

Still air
Air velocity 7.5 mph

Outside Inside

1" Air gap, t=50 F, Dt=30 F

HW#6:

1. Design a wall made of up to five materials and compute its U-


factor using the computer software “HVAC Tools”, which can
be downloaded
from: http://www.elitesoft.com/web/hvacr/elite_htools_info.htm
l

2. Compute the overall thermal resistance of a wall made up of 100


mm brick (1920 kg/m3) and 200 mm normal weight concrete
block with a 20 mm air gap between. There is 13 mm of gypsum
plaster on the inside. Assume a 7 m/s wind velocity on the
outside and still air inside.

3. Compute the overall heat-transfer coefficient for a frame


construction wall made of brick veneer (120 lbm/ft3) with 3 in.
insulation bats between the 2×4 studs on 16 in. centers; the
wind velocity is 15 mph.

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