Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
8th Edition
ISBN: 9781305387102
Author: Kreith, Frank; Manglik, Raj M.
Publisher: Cengage Learning
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Students have asked these similar questions
The amount of heat flow through a body by conduction is
O Directly proportional to the surface area of the body
O Directly proportional to the temperature difference on the two faces of the body
O Dependent upon the material of the body
O All of the above
ödaly übäi : Thermal diffusivity of a substance is
proportional of conductivity
inversely proportional to conductivity
None O
Question 5:
Z=62
a. An iron sphere of mass (Z + 300)g is kept in a container having boiling water (100 °C). If the
temperature of the sphere is 25.5°C, how much heat energy is absorbed by the iron sphere?
Consider the specific heat of iron as 452J/kg.
b. The wall of an industrial furnace is constructed from (Z + 3) cm thick fireclay brick having a
thermal conductivity of 1.7 W/mK. Measurements made during steady-state operation reveal
temperatures of 530°C and 375°C at the inner and outer surfaces, respectively. Find the rate
of heat loss through a wall which is (Z + 5) cm by (Z + 3) m on a side.
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- ösly äbä With rise in temperature , the conductivity of the metals depending on temperature remains constant decreases Increases نقطة واحدة When heat is transferred from hot body to cold body, in a straight line, without affecting the intervening medium, it is referred as heat transfer by conduction and convection radiation conduction convection نقطة واحدة Thermal diffusivity of a : substance isarrow_forwardDetermine the thermal conductivity of water vapor at 174°C.arrow_forwardWhen the sun is high in the sky, it delivers approximately 1000 watts of power to each square meter of earth's surface. The temperature of the surface of the sun is about 6000 K, while that of the earth is about 300 K. Suppose you plant grass on this square meter of earth. Some people might argue that the growth of the grass (or of any other living thing) violates the second law of thermodynamics, because disorderly nutrients are converted into an orderly life form. How would you respond?arrow_forward
- An electric heater producing 260 W of heat is used to warm up a room containing 7 m3 of air. If we assume the room is perfectly sealed and there is no heat loss through the room boundaries, such that all of the heater output goes into increasing the air temperature, how long will it take to heat up the air in the room from 5.0 °C to 24.1 °C? Give your answer to the nearest minute and assume that the specific volume (v = 0.85 m3/kg) and specific heat capacity at constant volume (cv = 1.005 kJ/(kg K)) remain constant throughout the heating process.arrow_forwardDetermine the heat conduction of a boiler if you are given the following data: The thickness of the boiler is 15 cm, the T1 is the temperature of the water is 25°C and the T2 of the steam is 110°C, the thermal conductivity The boiler material is iron (use presentation table), the boiler area is 4.5 m^2arrow_forwardWhat happens to heat transfer per unit time in conduction heat transfer as thermal conductivity decreases?arrow_forward
- is |Q|=-kA(dt/dx) the law that defines the rate of heat transfer by conduction (fourier's law of heat conduction) or is it |Q| = hA(tb-Tf)?arrow_forward1.77 Explain each in your own words. (a) What is the mode of heat transfer through a large steel plate that has its surfaces at specified temperatures? (b) What are the modes when the temperature on one surface of the steel plate is not specified, but the surface is exposed to a fluid at a specified temperature?arrow_forwardEXPERIMENT PROBLEM: A certain mechanical device with a mechanism similar to a piston contains a certain amount of gas. Upon compression from 55 L to 15 L, the gas released 350 J of heat. Experiment shows that the external pressure of the mechanical device is given by: Pext = AsinV + BcosV + CsinhV + DcoshV Where: A = 100 B = 80 C = 1x10⁻²⁵ D = 5x10⁻³⁰ sin = sine function cos = cosine function sinh = hyperbolic sine function cosh = hyperbolic cosine function V = in liters Pext = in atm Determine the change in internal energy of the system in kilojoules. TIP: usually, expressions involving trigonometric functions are in radians.arrow_forward
- Surface quality is affected due to Resistance strength of contact surfaces Friction resistance of contact surfaces O strength of joint contact surfaces O Wear resistance of contact surfacesarrow_forwardA pot with a diameter of 20 cm is placed on the stove. The pot is made of stainless plate (k = 15 W / [m ° C]), and contains boiling water at 98 ° C. The bottom of the pan is 0.4 cm thick. The surface temperature in the bottom of the pan in contact with water is 105 ° C. a. If the heat transfer rate through the bottom of the pan is 600 W, determine the temperature of the outside surface of the pan that is exposed to the heating stove. = Answer ° C. b. Find the convective heat transfer coefficient of boiling water = AnswerW / m2 ° Carrow_forwardA pot with a diameter of 20 cm is placed on the stove. The pot is made of stainless plate (k = 15 W / [m ° C]), and contains boiling water at 98 ° C. The bottom of the pan is 0.4 cm thick. The surface temperature in the bottom of the pan in contact with water is 105 ° C. a. If the heat transfer rate through the bottom of the pan is 600 W, determine the temperature of the outside surface of the pan that is exposed to the heating stove. = Answer° C. b. Determine the convective heat transfer coefficient of boiling water = AnswerW / m2 ° Carrow_forward
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