Heating Ventilating and Air Conditioning: Analysis and Design
6th Edition
ISBN: 9780471470151
Author: Faye C. McQuiston, Jeffrey D. Spitler, Jerald D. Parker
Publisher: Wiley, John & Sons, Incorporated
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Textbook Question
Chapter 5, Problem 5.25P
Rework Problem 5-23 assuming that the walls are finished on the inside with R-11 (R-2) insulation and
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To
8.
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1
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T₁
3
1.
2.
3.
4" Common Brick
1/2" OSB Sheathing
3-1/2" x 1-1/2" (2x4) Yellow Pine
Studding placed on 16" center
4.
5.
3-1/2" Figerglass Insulation
1/2" Drywall
A wall of a house as shown in the
accompanying sketch is 10 ft. high and 30
ft. long and has no windows. The outside
heat transfer coefficient, h., is 6.0 Btu/hr
ft2°F and the inside convective heat transfer
coefficient hi is 1.45 Btu/hr ft²°F.
6.
Calculate the heat loss through the
wall if the house is heated such that the
room air temperature, Ti, is 70°F on a day
when the outside air temperature, T., is 0°F.
State all assumptions and list the thermal
resistances and thermal conductivities for
each selection of the wall.
For this problem, what would be the
7.
value of the overall heat transfer coefficient, U?
Ans: U = 0.056 Btu/hr ft2°F
You are asked to design a metal hot dog holder for roasting hot dogs over an open
campfire. The holder is to be designed such that while the end holding the hot dog
becomes cherry…
To
8.
Ti
1.
2.
3.
4" Common Brick
1/2" OSB Sheathing
3-1/2" x 1-1/2" (2x4) Yellow Pine
Studding placed on 16" center
4.
5.
3-1/2" Figerglass Insulation
1/2" Drywall
A wall of a house as shown in the
accompanying sketch is 10 ft. high and 30
ft. long and has no windows. The outside
heat transfer coefficient, h., is 6.0 Btu/hr
ft2°F and the inside convective heat transfer
coefficient hi is 1.45 Btu/hr ft2°F.
6. Calculate the heat loss through the
wall if the house is heated such that the
room air temperature, Ti, is 70°F on a day
when the outside air temperature, T., is 0°F.
State all assumptions and list the thermal
resistances and thermal conductivities for
3 each selection of the wall.
7.
For this problem, what would be the
value of the overall heat transfer coefficient, U?
Ans: U = 0.056 Btu/hr ft2ºF
You are asked to design a metal hot dog holder for roasting hot dogs over an open
campfire. The holder is to be designed such that while the end holding the hot dog
becomes cherry red…
A 2x4 stud wall with a 3 1/2 in.
polyurethane foam cavity insulation, 1/2
inch of gypsum wall board on the inside
and 1/2 in. of osb sheathing, a 1/2 in air
space and 1/2 in of solid wood siding on
the exterior .( Neglect presence of the
studs)
Chapter 5 Solutions
Heating Ventilating and Air Conditioning: Analysis and Design
Ch. 5 - Determine the thermal conductivity of 4 in. (100...Ch. 5 - Compute the unit conductance C for 512 in. (140...Ch. 5 - Compute the unit thermal resistance and the...Ch. 5 - What is the unit thermal resistance for an inside...Ch. 5 - Compute the thermal resistance per unit length for...Ch. 5 - Assuming that the blocks are not filled, compute...Ch. 5 - The partition of Problem 5-4 has still air on one...Ch. 5 - The pipe of Problem has water flowing inside with...Ch. 5 - Compute the overall thermal resistance of a wall...Ch. 5 - Compute the overall heat-transfer coefficient for...
Ch. 5 - Estimate what fraction of the heat transfer for a...Ch. 5 - Make a table similar to Table 5-4a showing...Ch. 5 - Estimate the unit thermal resistance for a...Ch. 5 - Refer to Problem 5-13, and estimate the unit...Ch. 5 - A ceiling space is formed by a large flat roof and...Ch. 5 - A wall is 20 ft (6.1 m) wide and 8 ft (2.4 m) high...Ch. 5 - Estimate the heat-transfer rate per square foot...Ch. 5 - A wall exactly like the one described in Table...Ch. 5 - Prob. 5.19PCh. 5 - Compute the overall heat-transfer coefficient for...Ch. 5 - Compute the overall heat transfer for a single...Ch. 5 - Determine the overall heattransfer coefficient for...Ch. 5 - A basement is 2020ft(66m) and 7 ft (2.13 m) below...Ch. 5 - Estimate the overall heat-transfer coefficient for...Ch. 5 - Rework Problem 5-23 assuming that the walls are...Ch. 5 - A heated building is built on a concrete slab with...Ch. 5 - A basement wall extends 6 ft (1.8 m) below grade...Ch. 5 - A 2440ft(7.312.2m) building has a full basement...Ch. 5 - The floor of the basement described in Problem...Ch. 5 - Assume that the ground temperature tg is 40 F (10...Ch. 5 - Use the temperatures given in Problem 5-30 and...Ch. 5 - A small office building is constructed with a...Ch. 5 - A 100 ft length of buried, uninsulated steel pipe...Ch. 5 - Estimate the heat loss from 100 m of buried...Ch. 5 - A large beverage cooler resembles a small building...Ch. 5 - Consider the wall section shown in Fig. 5-10. (a)...Ch. 5 - A building has floor plan dimensions of 3060ft....Ch. 5 - Compute the temperature of the metal roof deck of...Ch. 5 - Consider the wall section shown in Fig. -4a,...Ch. 5 - Consider the knee space shown in Fig. 5-11. The...Ch. 5 - Estimate the temperature in an unheated basement...
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