Answered: JA: Draw the thermal network for a…

JA: Draw the thermal network for a single cover glass flat plat solar collector (a) in terms of conduction, convection, and radiation; (b) in terms of resistance between plates.

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter2: Steady Heat Conduction

Section: Chapter Questions

Problem 2.63P

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We need to build a heatable warehouse with a capacity of 2000 cubic meters. Because the building is located in a milieu-valuable area, only a pitched roof building with a 45- degree roof slope is allowed to be built there (see the attached picture), other building shapes aren't permitted. However, the width (a), length (b) and ridge height (c) can be varied. a 45° b Since the warehouse owner is one of the local leaders of Global Green Turn, it is his firm wish that the warehouse energy (heat) loss should be as small as possible. According to the builder, the building's walls and roof have both exactly the same heat resistance, but there's no heat loss through the floor into the ground at all. Consequently - we have to design a warehouse with a volume of 2000 cubic meters with the smallest possible total area of all walls and roofs. Task: What should be the actual width (a), length (b) and roof ridge height (c) of such a building?
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Some help please (How do I go about this? TIA)...Determine the rate of heat loss per square foot through thr wall of your home if the home is heated to 70F when the outside temperature of -10F. Assume the fiberglass insulation has the same properties as silica glass fiber.
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For your company you need to mass produce 20-cmx10-cm heat sinks to dissipate heat quickly from an equipment. After considering several other parameters, you have short-listed two possible designs: A. 72 straight pin fins made of an alloy (thermal conductivity 240 W/m-°C) that costs $9,000 per m³. Each pin is 4 cm long and 1-cm diameter. E.=3'18; $204 B. 64 straight rectangular fins made of another alloy (thermal conductivity 180 W/m.°C) that costs $12,000 per m³. Each pin is 4 cm long and has 2-cmx1-cm cross-section. Eo =7:94%$ 6·14 The convection coefficient of the operating condition is approximated as 15 W/m2.°c. Consider that the manufacturing cost is same for both designs but the material cost differs. Calculate and compare the cost and performance (in terms of heat transfer gains by the heat sinks) of the two heat sinks so that a decision can be made to select a design.
a. A slab of thermal insulator is 100 cm² in cross section and 2 cm thick. Its thermal conductivity is 2.4 x 10 -+ cal/(s cm C"). If the temperature difference between opposite faces is 180 F', how much heat flows through the slab in one day?
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The thermal conductivities of wood is kwood = 0.1W/(m°C)and air is kair = 0.0234W/(m°C). Part A If the temperature of the room is 20°C and outside is 10°C, find the rate of heat flow for a wall of wood with area = 10 m² and thickness of 5cm. O 60 W O 304 W O 34 W O 200 W O 100 W Submit Request Answer Part B The wall of wood with thickness of 5cm is now replaced with two layers of wood and a gap of air between the wood. Each layer of wood has a 2.5cm thickness and the gap is 1cm. The rate of heat flow will, decreases. increases. stay the same. Submit Request Answer Part C The temperature in the air gap will be, O 20°C, between 10°C and 20°C, O 10°C,
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