1 Basic Modes Of Heat Transfer 2 Steady Heat Conduction 3 Transient Heat Conduction 4 Numerical Analysis Of Heat Conduction 5 Analysis Of Convection Heat Transfer 6 Forced Convection Over Exterior Surfaces 7 Forced Convection Inside Tubes And Ducts 8 Natural Convection 9 Heat Transfer With Phase Change 10 Heat Exchangers 11 Heat Transfer By Radiation Chapter1: Basic Modes Of Heat Transfer
1.1 The Relation Of Heat Transfer To Thermodynamics 1.2 Dimensions And Units 1.3 Heat Conduction 1.4 Convection 1.5 Radiation 1.6 Combined Heat Transfer Systems 1.7 Thermal Insulation 1.8 Heat Transfer And The Law Of Energy Conservation 1.9 Summary Chapter Questions Section: Chapter Questions
Problem 1.1P: 1.1 On a cold winter day, the outer surface of a 0.2-m-thick concrete wall of a warehouse is exposed... Problem 1.2P: 1.2 The weight of the insulation in a spacecraft may be more important than the space required. Show... Problem 1.3P: 1.3 A furnace wall is to be constructed of brick having standard dimensions of Two kinds of... Problem 1.4P: 1.4 To measure thermal conductivity, two similar 1-cm-thick specimens are placed in the apparatus... Problem 1.5P: To determine the thermal conductivity of a structural material, a large 15-cm-thick slab of the... Problem 1.6P: A square silicon chip 7mm7mm in size and 0.5-mm thick is mounted on a plastic substrate as shown in... Problem 1.7P: A cooling system is to be designed for a food storage warehouse for keeping perishable foods cool... Problem 1.8P: 1.80 Describe and compare the modes of heat loss through the single-pane and double-pane window... Problem 1.9P: Heat is transferred at a rate of 0.1 kW through glass wool insulation (density=100kg/m3) with a 5-cm... Problem 1.10P: 1.10 A heat flux meter at the outer (cold) wall of a concrete building indicates that the heat loss... Problem 1.11P: 1.11 Calculate the heat loss through a glass window 7-mm thick if the inner surface temperature is... Problem 1.12P: 1.12 A wall with a thickness is made of a material with a thermal conductivity that varies with its... Problem 1.13P: 1.13 If the outer air temperature in Problem is –2°C, calculate the convection heat transfer... Problem 1.14P: Using Table 1.4 as a guide, prepare a similar table showing the orders of magnitude of the thermal... Problem 1.15P: 1.15 A thermocouple (0.8-mm-diameter wire) used to measure the temperature of the quiescent gas in a... Problem 1.16P: Water at a temperature of 77C is to be evaporated slowly in a vessel. The water is in a low-pressure... Problem 1.17P: The heat transfer rate from hot air by convection at 100C flowing over one side of a flat plate with... Problem 1.18P: The heat transfer coefficient for a gas flowing over a thin float plate 3-m long and 0.3-m wide... Problem 1.19P: 1.19 A cryogenic fluid is stored in a 0.3-m-diameter spherical container is still air. If the... Problem 1.20P: A high-speed computer is located in a temperature-controlled room at 26C. When the machine is... Problem 1.21P: 1.21 In an experimental set up in a laboratory, a long cylinder with a 5-cm diameter, and an... Problem 1.22P: 1.22 In order to prevent frostbite to skiers on chair lifts, the weather report at most ski areas... Problem 1.23P: Using the information in Problem 1.22, estimate the ambient air temperature that could cause... Problem 1.24P: Two large parallel plates with surface conditions approximating those of a blackbody are maintained... Problem 1.25P: 1.25 A spherical vessel, 0.3 m in diameter, is located in a large room whose walls are at 27°C (see... Problem 1.26P: 1.26 Repeat Problem 1.25 but assume that the surface of the storage vessel has an absorbance (equal... Problem 1.27P: Determine the rate of radiant heat emission in watts per square meter from a blackbody at (a) 15C,... Problem 1.28P: 1.28 The sun has a radius of and approximates a blackbody with a surface temperature of about 5800... Problem 1.29P: 1.29 A spherical interplanetary probe with a 30-cm diameter contains electronic equipment that... Problem 1.30P Problem 1.31P: A spherical communications satellite, 2 m in diameter, is placed in orbit around the earth. The... Problem 1.32P: A long wire 0.7 mm in diameter with an emissivity of 0.9 is placed in a large quiescent air space at... Problem 1.33P: Wearing layers of clothing in cold weather is often recommended because dead-air spaces between the... Problem 1.34P: A section of a composite wall with the dimensions shown below has uniform temperatures of 200C and... Problem 1.35P: A section of a composite wall with the dimensions shown below has uniform temperatures of 200C and... Problem 1.36P: Repeat Problem 1.35 but assume that instead of surface temperatures, the given temperatures are... Problem 1.37P: 1.37 Mild steel nails were driven through a solid wood wall consisting of two layers, each 2.5-cm... Problem 1.38P Problem 1.39P: 1.39 On a cold winter day, the outside wall of a home is exposed to an air temperature of when the... Problem 1.40P: As a designer working for a major electric appliance manufacturer, you are required to estimate the... Problem 1.41P: 1.41 A heat exchanger wall consists of a copper plate 2 cm thick. The heat transfer coefficients on... Problem 1.42P Problem 1.43P: 1.43 A simple solar heater consists of a flat plate of glass below which is located a shallow pan... Problem 1.44P: A composite refrigerator wall is composed of 5 cm of corkboard sandwiched between a 1.2-cm-thick... Problem 1.45P: An electronic device that internally generates 600 mW of heat has a maximum permissible operating... Problem 1.46P Problem 1.47P: 1.47 A flat roof is modeled as a flat plate insulated on the bottom and placed in the sunlight. If... Problem 1.48P: A horizontal, 3-mm-thick flat-copper plate, 1-m long and 0.5-m wide, is exposed in air at 27C to... Problem 1.49P: 1.49 A small oven with a surface area of is located in a room in which the walls and the air are at... Problem 1.50P: A steam pipe 200 mm in diameter passes through a large basement room. The temperature of the pipe... Problem 1.51P: 1.51 The inner wall of a rocket motor combustion chamber receives by radiation from a gas at . The... Problem 1.52P: 1.52 A flat roof of a house absorbs a solar radiation flux of . The backside of the roof is well... Problem 1.53P: Determine the power requirement of a soldering iron in which the tip is maintained at 400C. The tip... Problem 1.54P: 1.54 The soldering iron tip in Problem 1.53 becomes oxidized with age and its gray-body emittance... Problem 1.55P Problem 1.56P: A pipe carrying superheated steam in a basement at 10C has a surface temperature of 150C. Heat loss... Problem 1.57P Problem 1.58P: Draw the thermal circuit for heat transfer through a double-glazed or a double-paned window.... Problem 1.59P Problem 1.60P: 1.60 Two electric resistance heaters with a 20 cm length and a 2 cm diameter are inserted into a... Problem 1.61P Problem 1.62P Problem 1.63P: 1.63 Liquid oxygen (LOX) for the space shuttle is stored at 90 K prior to launch in a spherical... Problem 1.64P: The interior wall of a large, commercial walk-in type meat freezer is covered under normal operating... Problem 1.65P Problem 1.66P Problem 1.67P: 1.67 In beauty salons and in homes, a ubiquitous device is the hairdryer. The front end of a typical... Problem 1.68P Problem 1.69P: The heat transfer coefficient between a surface and a liquid is 57 W/(m2K). How many watts per... Problem 1.70P: The thermal conductivity of fibreglass insulation at 67F is 0.02 Btu/h ft F. What is its value in SI... Problem 1.71P: 1.71 The thermal conductivity of silver at 212°F is 238 Btu/h ft °F. What is the conductivity in SI... Problem 1.72P: 1.72 An ice chest (see sketch) is to constructed from styrofoam . If the wall of the chest is 5-cm... Problem 1.73P: Estimate the R-values for a 5-cm-thick fiberglass board and a 2.5-cm-thick polyurethane foam layer.... Problem 1.74P: A manufacturer in the United States wants to sell a refrigeration system to a customer in Germany.... Problem 1.75P: Referring to Problem 1.74, how many kilograms of ice can a 3-ton refrigeration unit produce in a... Problem 1.76P: 1.76 Explain a fundamental characteristic that differentiates conduction from convection and... Problem 1.77P: 1.77 Explain each in your own words. (a) What is the mode of heat transfer through a large steel... Problem 1.78P: What are the important modes of heat transfer for a person sitting quietly in a room? What if the... Problem 1.79P: 1.79 Consider the cooling of (a) a personal computer with a separate CPU and (b) a laptop computer.... Problem 1.80P: Describe and compare the modes of heat loss through the single-pane and double-pane window... Problem 1.81P: A person wearing a heavy parka is standing in a cold wind. Describe the modes of heat transfer... Problem 1.82P: Discuss the modes of heat transfer that determine the equilibrium temperature of the space shuttle... Problem 1.1DP Problem 1.2DP Problem 1.3DP Problem 1.31P: A spherical communications satellite, 2 m in diameter, is placed in orbit around the earth. The...
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Topic: Thermodynamics
Transcribed Image Text: 6. In a room at 30°C having a thin square plate of 0.6 m x
0.6m. One side of the plate is maintained at a temperature
of 90 °C while the other side is insulated as shown in the
90°C
T,-30°C
figure. Determine the rate of heat transfer from the plate by
L-0,6 m
natural convection if the plate is (a)vertical (b) horizontal
with hot surface facing up.
(a) Vertical
(h) Hot surface facing up
Science that deals with the amount of energy transferred from one equilibrium state to another equilibrium state.
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