Q.1 A chilling plant has inside dimensions 70 cm length, 50 cm width and 130 cm height. The walls of the chilling plant are 3mm thick. Temperature inside the chilling plant is to be maintained at 4°C. The walls of chilling plant are insulated with fibre glass 75 mm thickness. The outer metal cover is provided over the insulation have 3 mm thickness. The surrounding air temperature is 30°C. Film coefficient of heat transfer at the inner surface of chilling plant and at the outer surface of the chilling plant are 10 W/m2°C and 113.5 W/m²°C respectively. k(metal wall) = 43 W/m °C, k(fibre glass) 0.035 W/m °C At steady state operation, Calculate: 1) The rate of removal for chilling plant; 2) The temperature at the inner and outer surface of insulation; 3) Temperature at the outer surface of metal wall

Q.1 A chilling plant has inside dimensions 70 cm length, 50 cm width and 130 cm height. The walls of the chilling plant are 3mm thick. Temperature inside the chilling plant is to be maintained at 4°C. The walls of chilling plant are insulated with fibre glass 75 mm thickness. The outer metal cover is provided over the insulation have 3 mm thickness. The surrounding air temperature is 30°C. Film coefficient of heat transfer at the inner surface of chilling plant and at the outer surface of the chilling plant are 10 W/m2°C and 113.5 W/m²°C respectively. k(metal wall) = 43 W/m °C, k(fibre glass) 0.035 W/m °C At steady state operation, Calculate: 1) The rate of removal for chilling plant; 2) The temperature at the inner and outer surface of insulation; 3) Temperature at the outer surface of metal wall

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.

Chapter5: Analysis Of Convection Heat Transfer

Section: Chapter Questions

Problem 5.51P

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1.3 A furnace wall is to be constructed of brick having standard dimensions of Two kinds of material are available. One has a maximum usable temperature of 1040°C and a thermal conductivity of 1.7 W/(m K), and the other has a maximum temperature limit of 870°C and a thermal conductivity of 0.85 W/(m K). The bricks have the same cost and are laid in any manner, but we wish to design the most economical wall for a furnace with a temperature of 1040°C on the hot side and 200°C on the cold side. If the maximum amount of heat transfer permissible is 950 , determine the most economical arrangement using the available bricks.
1.4 To measure thermal conductivity, two similar 1-cm-thick specimens are placed in the apparatus shown in the accompanying sketch. Electric current is supplied to the guard heater, and a wattmeter shows that the power dissipation is 10 W. Thermocouples attached to the warmer and to the cooler surfaces show temperatures of 322 and 300 K, respectively. Calculate the thermal conductivity of the material at the mean temperature in W/m K. Problem 1.4
Repeat Problem 1.35 but assume that instead of surface temperatures, the given temperatures are those of the air on the left and right sides of the wall and that the convection heat transfer coefficients on the left and right surfaces are 6 and 10W/m2K, respectively.
Using Table 1.4 as a guide, prepare a similar table showing the orders of magnitude of the thermal resistances of a unit area for convection between a surface and various fluids.
One end of a 0.3-m-long steel rod is connected to a wall at 204C. The other end is connected to a wall that is maintained at 93C. Air is blown across the rod so that a heat transfer coefficient of 17W/m2 K is maintained over the entire surface. If the diameter of the rod is 5 cm and the temperature of the air is 38C, what is the net rate of heat loss to the air?