h== 10100m² °q3- Radiation heat transfer:This is when heat is transferred by radiating off of an object.• All bodies send out energy in the form of electromagnetic radiation.• The wavelength and intensity is dependent on the temperature of thesurface.• Radiation may be transferred through vacuum, but also through air.HW1The inner surface of a plane brick wall is at 60°C and the outer surface is at 35°C. Calculate the rate of heattransfer per m of surface area of the wall, which is 220 mm thick. The thermal conductivity of the brick is0.51 W/m°C.HW2A reactor's wall 320 mm thick, is made up of an inner layer of fire brick (k = 0.84 W/m°C) covered with a layerof insulation (k = 0.16 W/m°C). The reactor operates at a temperature of 1325°C and the ambient temperature is25°C. (i) Determine the thickness of fire brick and insulation which gives minimum heat loss. (ii) Calculate theheat loss presuming that the insulating material has a maximum temperature of 1200°C.HW3Q1A 0.1-m-thick brick wall is exposed to a cold wind at 270 K through a convection heat transfer coefficient of 40W/m K. On the other side is calm air at 330 K, with a natural-convection heat transfer coefficient of 10 W/m?K. Calculate the rate of heat transfer per unit area (i.e., the heat flux).Q2A mild steel tank of wall thickness 12 mm contains water at 95°C. The thermal conductivity of mild steel is 50W/m°C, and the heat transfer coefficients for the inside and outside the tank are 2850 and 10 W/m°C,respectively. If the atmospheric temperature is 15°C, calculate:(i) The rate of heat loss per m of the tank surface area;(ii) The temperature of the outside surface of the tank.Q3The interior of a refrigerator having inside dimensions of 0.5 m x 0.5 m base area and 1 m height, is to bemaintained at 6°C. The walls of the refrigerator are constructed of two mild steel sheets 3 mm thick (k = 46.5W/m°C) with 50 mm of glass wool insulation (k = 0.046 W/m°C) between them. If the average heat transfercoefficients at the inner and outer surfaces are 11.6 W/m2°C and 14.5 W/m2°C respectively, calculate:(i) The rate at which heat must be removed from the interior to maintain the specified temperature in the kitchenat 25°C, and(ii) The temperature on the outer surface of the metal sheet.

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The inner surface of a plane brick wall is at 60°C and the outer surface is at 35°C. Calculate the rate of heat transfer per m' of surface area of the wall, which is 220 mm thick. The thermal conductivity of the brick is 0.51 W/m°C.

The inner surface of a plane brick wall is at 60°C and the outer surface is at 35°C. Calculate the rate of heat transfer per m' of surface area of the wall, which is 220 mm thick. The thermal conductivity of the brick is 0.51 W/m°C.

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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Concept explainers

Energy transfer

The flow of energy from one region to another region is referred to as energy transfer. Since energy is quantitative; it must be transferred to a body or a material to work or to heat the system.

Molar Specific Heat

Heat capacity is the amount of heat energy absorbed or released by a chemical substance per the change in temperature of that substance. The change in heat is also called enthalpy. The SI unit of heat capacity is Joules per Kelvin, which is (J K-1)

Thermal Properties of Matter

Thermal energy is described as one of the form of heat energy which flows from one body of higher temperature to the other with the lower temperature when these two bodies are placed in contact to each other. Heat is described as the form of energy which is transferred between the two systems or in between the systems and their surrounding by the virtue of difference in temperature. Calorimetry is that branch of science which helps in measuring the changes which are taking place in the heat energy of a given body.

Question

h=
= 10
100
m² °q
3- Radiation heat transfer:
This is when heat is transferred by radiating off of an object.
• All bodies send out energy in the form of electromagnetic radiation.
• The wavelength and intensity is dependent on the temperature of the
surface.
• Radiation may be transferred through vacuum, but also through air.
HW1
The inner surface of a plane brick wall is at 60°C and the outer surface is at 35°C. Calculate the rate of heat
transfer per m of surface area of the wall, which is 220 mm thick. The thermal conductivity of the brick is
0.51 W/m°C.
HW2
A reactor's wall 320 mm thick, is made up of an inner layer of fire brick (k = 0.84 W/m°C) covered with a layer
of insulation (k = 0.16 W/m°C). The reactor operates at a temperature of 1325°C and the ambient temperature is
25°C. (i) Determine the thickness of fire brick and insulation which gives minimum heat loss. (ii) Calculate the
heat loss presuming that the insulating material has a maximum temperature of 1200°C.
HW3
Q1
A 0.1-m-thick brick wall is exposed to a cold wind at 270 K through a convection heat transfer coefficient of 40
W/m K. On the other side is calm air at 330 K, with a natural-convection heat transfer coefficient of 10 W/m?
K. Calculate the rate of heat transfer per unit area (i.e., the heat flux).
Q2
A mild steel tank of wall thickness 12 mm contains water at 95°C. The thermal conductivity of mild steel is 50
W/m°C, and the heat transfer coefficients for the inside and outside the tank are 2850 and 10 W/m°C,
respectively. If the atmospheric temperature is 15°C, calculate:
(i) The rate of heat loss per m of the tank surface area;
(ii) The temperature of the outside surface of the tank.
Q3
The interior of a refrigerator having inside dimensions of 0.5 m x 0.5 m base area and 1 m height, is to be
maintained at 6°C. The walls of the refrigerator are constructed of two mild steel sheets 3 mm thick (k = 46.5
W/m°C) with 50 mm of glass wool insulation (k = 0.046 W/m°C) between them. If the average heat transfer
coefficients at the inner and outer surfaces are 11.6 W/m2°C and 14.5 W/m2°C respectively, calculate:
(i) The rate at which heat must be removed from the interior to maintain the specified temperature in the kitchen
at 25°C, and
(ii) The temperature on the outer surface of the metal sheet.

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