a. Explanation Given: Length of the layer of insulation L i = 3 in . Length of the layer of siding L s = 0.75 in . The inner temperature of the insulation T i = 67 ° F . The outer temperature of the siding T s = − 8 ° F . The thermal conductivity of the insulation layer, k i = 0.029 BTU-hr − 1 - o R − 1 . The thermal conductivity of the sliding layer, k s = 0.058 BTU-hr − 1 - o R − 1 . The heat transfer rate is the rate by which an amount of heat flows from one place to another place. The rate of heat transfer is calculated with the following formula. Q = − k A T o − T i L Here, Q is the rate of heat transfer, k is thermal conductivity A is the area, L is the length of the wall. T o is the temperature at the outer surface, and T i is the inner surface temperature. Calculation: There are 12 inches in one foot. Thus, divide the length of the layer of insulation and layer of sliding by 12 to convert them into feet. L i = 3 in 12 L i = 0.25 ft L s = 0 .75 in 12 L s = 0 b. To determine The rate of heat transfer through the wall of surface area.

FUND OF ENG THERMODYN-WILEYPLUS NEXT GEN

9th Edition

ISBN: 9781119840589

Author: MORAN

Publisher: WILEY

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Chapter 2, Problem 2.37P

To determine

The temperature at the interface of the two layers.

To determine

The rate of heat transfer through the wall of surface area.

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Chapter 2, Problem 2.36P

Chapter 2, Problem 2.38P

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A furnace wall is to be designed to transmit a maximum heat flux of 220 Btu/hr.ft of wall area. The inside and outside wall temperatures are to be 2200 • F and 320 ° F. Determine the most economical arrangement of bricks measuring (9 in x 4; in x 3 in). If they are made from materials one with ak of 0.44 Btu/hr. ft. ° F and maximum usable temperature of 1700 ° F and other with a k of 0.94 Btu/hr. ft. ° F and a maximum usable temperature of 2400 ° F. Bricks made of each material cost the same amount and may be laid in any manner (but bricks must remain intact, i.e., no partial bricks). After you answer the question, determine the percent increase in heat flux if there are two -in.-diameter steel bolts extending through the wall per square foot of wall are. (k of steel = 22 Btu/hr. ft. F)|

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A composite plane wall consists of a 5-in.-thick layer of insulation (ks = 0.029 Btu/h ft. "R) and a 0.75-in.-thick layer of siding (ks = 0.058 Btu/h-ft- ºR). The inner temperature of the insulation is 67°F. The outer temperature of the siding is 0°F. Determine at steady state (a) the temperature at the interface of the two layers, in °F, and (b) the rate of heat transfer through the wall in Btu/h-ft² of surface area.

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FUND OF ENG THERMODYN-WILEYPLUS NEXT GEN

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The temperature at the interface of the two layers.

Solution Summary: The author explains the heat transfer rate, which is the rate by which an amount of heat flows from one place to another.

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The temperature at the interface of the two layers.

The rate of heat transfer through the wall of surface area.

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Chapter 2 Solutions