A 45.6 W power is supplied to a asbestos cement board with a thickness of 0.006m. Water of 60°C is circulating to protect the specimen with a diameter of 0.25m. Calculate the thermal conductivity of asbestos cement board

A 45.6 W power is supplied to a asbestos cement board with a thickness of 0.006m. Water of 60°C is circulating to protect the specimen with a diameter of 0.25m. Calculate the thermal conductivity of asbestos cement board

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.

Chapter1: Basic Modes Of Heat Transfer

Section: Chapter Questions

Problem 1.38P

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Mica sheet of 0.15 m diameter and has thickness of 0.005m is subjected to heater with a supply of 28W power. Cold water is circulated around the specimen with a temperature of 30°C; calculate the thermal conductivity of the specimen?
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PROBLEM: IIC - 12 BOOK: ENGINEERING THERMOFLUIDS, M. MASSOUD
Question 1 A composite component is comprised of a tube and a concentric rod running inside it, both with a length of 1.5 meters. The tube is made of copper and has inner and outer diameters of 60 mm and 100 mm, respecti vely, a coefficient of thermal expansion and elastic modulus of 17 x10-6C and 117 GPa, respectively. The rod is made of aluminium with a diameter, coefficient of thermal expansion and elastic modulus of 50 mm, 23 x10-6C and 80 GPa, respectively. If the composite is exposed to a temperature rise of 120°C, determine: The sense and magnitude of the stresses induced in the composite if it is not restrained. 1.1 1.2 The sense and magnitude of the stresses induced in the composite ifit is partially restrained with an allowed free expansion of 0.3 mm.
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The Diamond Ring Solution. The processing chip on the computer that controls the navigation equipment on your spacecraft is overheating. Unless you fix the problem, the chip will be damaged and the navigation system will shut down. You open the panel and find that the small copper disk that was supposed to bridge the gap between the smooth top of the chip and the cooling plate is missing, leaving a 2.0 mm gap between them. In this configuration, the heat cannot escape the chip at the required rate. You notice by the thin smudge of thermal grease (a highly thermally conductive material used to promote good thermal contact between surfaces) that the missing copper disk was 2.0 mm thick and had a díameter of 1.2 cm. You know that the chip is designed to run below 65 °C, and the copper cooling plate is held at a constant 5.0 °C. (a) What was the rate of heat flow from the chip to the copper plate when the original copper disk was in place and the chip was at its maximum operating…
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PROBLEM: IIC-21 BOOK: ENGINEERING THERMOFLUIDS, M. MASSOUD
composite protective wall is formed of a 1 in copper plate, a 1/8 in layer of asbestos, a 2 in layer of fiberglass. The thermal conductivities of the materials in units of BTU/hr-ft-F are 240, 0.048 and 0.022 respectively. The overall temperature difference across the wall is 500 F. Calculate the heat transfer per unit area through the composite structure.