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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Chapter 3, Problem 3.16P
A large, 2.54-cm.-thick copper plate is placed between two air streams. The heat transfer coefficient on one side is
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During a picnic on a hot summer day, the only available drinks were those at the ambient temperature of 90°F. In an effort to cool a 12-fluid-oz drink in a can, which is 5 in high and has a diameter of 2.5 in, a person grabs the can and starts shaking it in the iced water of the chest at 32°F. The temperature of the drink can be assumed to be uniform at all times, and the heat transfer coefficient between the iced water and the aluminum can is 30 Btu/h·ft2·°F. Using the properties of water for the drink, estimate how long it will take for the canned drink to cool to 40°F.
The inner and outer surfaces of a 0.5-cm thick 2-m x
2-m window glass in winter are 10°C and 3°C,
respectively. If the thermal conductivity of the glass
is 0.78 W/m-K,determine the amount of heat loss
through the glass over a period of 5 h. What would
your answer be if the glass were 1 cm thick?
Answers:78.6 MJ, 39.3 MJ
Two identical aluminum plates with thickness of 30 cm are pressed against each other at an average pressure of 1 atm. The interface, sandwiched between the two plates, is filled with glycerin. On the left outer surface, it is subjected to a uniform heat flux of 7800 W/m2 at a constant temperature of 50°C. On the right outer surface, the temperature is maintained constant at 30°C. Determine the thermal contact conductance of the glycerin at the interface, if the thermal conductivity of the aluminum plates is 237 W/m∙K. Discuss whether the value of the thermal contact conductance is reasonable or not
Chapter 3 Solutions
Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
Ch. 3 - Consider a flat plate or a plane wall with a...Ch. 3 - 3.2 High-strength steel is required for use in...Ch. 3 - Prob. 3.3PCh. 3 - 3.5 In a ball-bearing production facility, steel...Ch. 3 - A 0.6-cm diameter mild steel rod at 38C is...Ch. 3 - Prob. 3.7PCh. 3 - Prob. 3.8PCh. 3 - 3.9 The heat transfer coefficients for the flow of...Ch. 3 - 3.10 A spherical shell satellite (3-m-OD,...Ch. 3 - Prob. 3.11P
Ch. 3 - Prob. 3.12PCh. 3 - Prob. 3.13PCh. 3 - 3.14 A thin-wall cylindrical vessel (1 m in...Ch. 3 - A thin-wall jacketed tank heated by condensing...Ch. 3 - 3.16 A large, 2.54-cm.-thick copper plate is...Ch. 3 - 3.17 A 1.4-kg aluminum household iron has a 500-W...Ch. 3 -
3.28 A long wooden rod at with a 2.5-cm-OD is...Ch. 3 - A mild-steel cylindrical billet 25 cm in diameter...Ch. 3 - Prob. 3.37PCh. 3 -
3.38 An egg, which for the purposes of this...
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- Consider a person standing in a room at 18°C. Determine the total rate of heat transfer from this person if the exposed surface area and the skin temperature of the person are 1.7 m2 and 32°C. respectively, and the convection heat transfer coefficient is 5 W/m2-K. Take the emissivity of the skin and the clothes to be 0.9, and assume the temperature of the inner surfaces of the room to be the same as the air temperature.arrow_forwardTwo large steel plates at temperature of 90°C and 70°C are separated by a steel rod 2.5 cm diameter and 0.25 m long. The rod is welded to each plate. The space between the plates is filled with insulation which also insulates the circumference of the rod. Because of voltage difference between the two plates current flows through the rod and the electrical energy is dissipated at a rate of 10 W. Determine the maximum temperature in the rod and the heat flux at each end. Proceed to compare the net heat flow rate of the two ends with the total rate of heat generation. Thermal conductivity for the rod material is 42.5 W/m-deg.arrow_forwardThe inner and outer surfaces of a 0.3 cm thick 1.8 m x 2.5 m window glass in winter are 20°C and 1°C, respectively. If the thermal conductivity of the glass is 0.8 W/m-K, determine the amount of heat loss through the glass over a period of 4 h. What would your answer be if the glass were 0.6 cm thick?arrow_forward
- The convection heat transfer coefficient between a surface at 40°C and air at 20°C is 20 W⁄m2 − K. Calculate the heat transfer per square meter leaving the surface.arrow_forwardA person stands in a breezy room whose temperature is 20 °C. The emissivity of the person is 0.35. Determine the total rate of heat transfer from this person if the exposed surface area and the average surface temperature of the person are 1.6 m2 and 29 °C respectively. Take the convection heat transfer coefficient to be 6.5 W/m2/K and that the surrounding wall of the room is at a temperature of 20 oC. Select one: A 123.7 W B. 86.4 W C. 151.7 W D. 100.5 W E 43.0 Warrow_forwardA 6 cm diameter cylinder is initially at a temperature of 10 °C. Later, this cylinder was thrown into water at 80°C. Calculate how long it will take for the center temperature of the cylinder to reach 50 °C by taking the convection heat transfer coefficient as 80W //m?K. Thermal properties of the cylinder material k=0,587 W/m°C a = 0,13x10-m² /sarrow_forward
- The top surface of the passenger car of a train moving at a velocity of 115 km/h is 2.8 m wide and 8 m long. The top surface is absorbing solar radiation at a rate of 380 W/m2 and the temperature of the ambient air is 30°C. Assuming the roof of the car to be perfectly insulated and the radiation heat exchange with the surroundings to be small relative to convection, determine the equilibrium temperature of the top surface of the car. The properties of air at 30°C are (Table A-15) k = 0.02588 W/m⋅°C, v = 1.608 × 10−5 m2/s, and Pr = 0.7282.The equilibrium temperature of the top surface of the car is:arrow_forwardA thermopane window consists of two glass panes, each 0.50 cm thick, with a 1.0-cm-thick sealed layer of air in between. (a) If the inside surface temperature is 22.1°C and the outside surface temperature is 0.0°C, determine the rate of energy transfer through 1.40 m² of the window. W (b) Compare your answer to (a) with the rate of energy transfer through 1.40 m² of a single 1.0-cm-thick pane of glass. Disregard surface air layers. (Find the rate of energy transfer.) kWarrow_forwardConsider a person standing in a roomn at 20°C with an exposed surface area of 1.5 m2. The deep body temperature of the human body is 37°C, and the thermal conductivity of the human tissue near the skin is about 0.3 W/m-°C. The body is losing heat at a rate of 150 W by natural convection and radiation to the surroundings. Taking the body temperature 0.5 cm beneath the skin to be 37°C, determine the skin temperature of the person. °Carrow_forward
- A non-insulated steam pipe passes through a room at 30°C. It has an outside diameter and a coefficient of convection of 75 mm and 15 W/m2-K . Determine the heat transmitted in W/m if the surface temperature is 150°C.arrow_forwardA long pipe carrying hot water loses heat to the ambient air. The heat loss was measured to be 480 W/m² at the outer surface of the pipe. The temperature of the hot water and the ambient air are 60°C and 20°C, respectively. The pipe has an inner diameter of 8 cm and outer diameter of 12 cm. The thermal conductivity of the pipe material is 1.4 W/m.K. If the convection coefficient of the hot water inside the pipe is 80 W/m².K, what is the convection coefficient of the ambient air? Assume steady and one-dimensional heat transfer. Neglect radiation. к 21.2 W/m²Karrow_forwardWhat is the heat power lost from the cup to the air due to convection? Take the external surface of a cup (with lid) to be at a temperature of 55.0oC and take the ambient air temperature to be 20.0oC. Take the heat convection coefficient to be 7.10 W/m2K for air. The area of the cup from which heat is transferred to air consists of the lid and the sides of the cup only, where the cup radius is 4.00 cm and its height is 9.20 cm. Give your answer in units of W, accurate to 1 decimal place.arrow_forward
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Heat Transfer – Conduction, Convection and Radiation; Author: NG Science;https://www.youtube.com/watch?v=Me60Ti0E_rY;License: Standard youtube license