Problem 1.1P: The thermal conductivity of a sheet of rigid, extrudedinsulationis reported to be k=0.029W/mK .... Problem 1.2P: The heat flux that is applied to the left face of a planewall is q=20W/m2 . The wall is of thickness... Problem 1.3P: A concrete wall, which has a surface area of 20m2 andis 0.30 in thick, separates conditioned room... Problem 1.4P: The concrete slab of a basement is 11 in long. 8 in wide,and 0.20 m thick. During the winter,... Problem 1.5P: Consider Figure 1.3. The heat flux in the x-direction is qxn=10W/m2 , the thermal conductivity and... Problem 1.6P: The heal flux through a wood slab 50 mm thick, whoseinner and outer surface temperatures are 40 and... Problem 1.7P: The inner and outer surface temperatures of a glassWindow 5 mm thick are 1 5 and 5°C. What is the... Problem 1.8P: A thermodynamic analysis of a proposed Brayton cyclegas turbine yields P=5MW of net power... Problem 1.9P: A glass window of width W=1m and height H=2m is 5 mm thick and has a thermal conductivity of... Problem 1.10P: A freezer compartment consists of a cubical cavity that is 2 mon a side. Assume the bottom to be... Problem 1.11P: The heat flux that is applied to one face of a plane wallis q=20W/m2 . The opposite face is exposed... Problem 1.12P: An inexpensive food and beverage container is fabricated from 25-mm-thick polystyrene (k=0.023W/mK)... Problem 1.13P: What is the thickness required of a masonry wall havingthermal conductivity 0.75W/mK if the heat... Problem 1.14P: A wall is made from an inhomogeneous (nonuniform)material for which the thermal conductivity... Problem 1.15P: The 5-mm-thick bottom of a 200-mm-diameter panmay be made from aluminum (k=240W/mK) orcopper... Problem 1.16P: A square silicon chip (k=150W/mK) is of width w=5mm on a side and of thickness t=1mm . Thechip is... Problem 1.17P: For a boiling process such as shown in Figure 1.5 c, theambient temperature T in Newton’s law of... Problem 1.18P: You’ve experienced convection cooling if you’ve everextended your hand out the window of a moving... Problem 1.19P: Air at 40°C flows over a long, 25-mm-diameter cylinderwith an embedded electrical heater. In a... Problem 1.20P: A wall has inner and outer surface temperatures of 16and 6°C, respectively. The interior and... Problem 1.21P: An electric resistance heater is embedded in a longcylinder of diameter 30 mm. When water with a... Problem 1.22P: The free convection heat transfer coefficient on a thinhot vertical plate suspended in still air can... Problem 1.23P: A transmission case measures W=0.30m on a sideand receives a power input of Pi=150hp from theengine.... Problem 1.24P: A cartridge electrical heater is shaped as a cylinder oflength L=200mm and outer diameter D=200mm .... Problem 1.25P: A common procedure for measuring the velocity of anairstream involves the insertion of an... Problem 1.26P: A square isothermal chip is of width w=5mm on aside and is mounted in a substrate such that its side... Problem 1.27P: The temperature controller for a clothes dryer consists of a bimetallic switch mounted on an... Problem 1.28P: An overhead 25-m-long, uninsulated industrial steampipe of 100-mm diameter is routed through a... Problem 1.29P: Under conditions for which the same room temperatureis maintained by a heating or cooling system, it... Problem 1.30P: A spherical interplanetary probe of 0.5-m diameter contains electronics that dissipate 150 W. It the... Problem 1.31P: An instrumentation package has a spherical outer surfaceof diameter D=100mm and emissivity =0.25 .... Problem 1.32P: Consider the conditions of Problem 1.22. However, nowthe plate is in a vacuum with a surrounding... Problem 1.33P: If TsTsur in Equation 1.9, the radiation heat transfer coefficient may be approximated as hr,a=4T3... Problem 1.34P: A vacuum system, as used ¡n sputtering electrically conducting thin films on microcircuits, is... Problem 1.35P: An electrical resistor is connected to a battery, asshown schematically. After a brief transient,... Problem 1.36P: Pressurized water (pin=10bar,Tin=110C) enters thebottom of an L=10-m-long vertical tube of diameter... Problem 1.37P: Consider the tube and inlet conditions of Problem 1.36.Heat transfer at a rate of q=3.98MW is... Problem 1.38P: An internally reversible refrigerator has a modifiedcoefficient of performance accounting for... Problem 1.39P: A household refrigerator operates with cold- andhot-temperature reservoirs et Tc=5C and Th=25C ,... Problem 1.40P: Chips of width L=15mm on a side are mounted to asubstrate that is installed in an enclosure whose... Problem 1.41P: Consider the transmission case of Problem 1 .23,butnow allow for radiation exchange with the... Problem 1.42P: One method for growing thin silicon sheets for photo voltaic solar panels is to pass two thin... Problem 1.43P: Heat is transferred by radiation and convection betweenthe inner surface of the nacelle of the wind... Problem 1.44P: Radioactive wastes are packed in a long, thin-walledcylindrical container. The wastes generate... Problem 1.45P: An aluminum plate 4 mm thick is mounted in a horizontal position, and its bottom surface ¡s well... Problem 1.46P: A blood warmer is to be used during the transfusion ofblood to a patient. This device is to heat... Problem 1.47P: Consider a carton of milk that is refrigerated at a temperature of Tm=5C . The kitchen temperature... Problem 1.48P Problem 1.49P: Liquid oxygen, which has a boiling into of 90 K and a latent heat of vaporization of 214 kJ/kg, is... Problem 1.50P: The emissivity of galvanized steel sheet, a commonroofing material, is =0.13 at temperatures... Problem 1.51P: Three electric resistance heaters of length L=250mm and diameter D=25mm are submerged in a 10-gal... Problem 1.52P: A hair dryer may be idealized as a circular duct through which a small fan draws ambient air and... Problem 1.53P: In one stage of an annealing process, 304 stainless steelsheet is taken from 300 K to 1250 K as it... Problem 1.54P: Convection ovens operate on the principle of inducing forced convection inside the oven chamber with... Problem 1.55P: Annealing, an important step ¡n semiconductor materials processing, can be accomplished by rapidly... Problem 1.56P: In the thermal processing of semiconductor materials,annealing ¡s accomplished by heating a silicon... Problem 1.57P: A furnace tor processing semiconductor materials isformed by a silicon carbide chamber that is... Problem 1.58P Problem 1.59P: Consider the wind turbine of Example 1.3. To reduce thenacelle temperature to Ts=30C , the nacelle... Problem 1.60P: Consider the conducting rod of Example 1.4 understeady-slate conditions. As suggested in Comment 3,... Problem 1.61P: A long bus bar (cylindrical rod used for making electrical connections) of diameter D is installed... Problem 1.63P: A 50mm45mm20mm cell phone chargerhas a surface temperature of Ts=33C when plugged into an electrical... Problem 1.64P: A spherical, stainless steel (AISI 302) canister is used tostore reacting chemicals that provide for... Problem 1.65P: A freezer compartment is covered with a 2-mm-thicklayer of frost at the time it malfunctions. If... Problem 1.66P: A vertical slab of Wood’s metal is joined to a substrate onone surface and is incited as it is... Problem 1.67P: A photovoltaic panel of dimension 2m4m isinstalled on the root of a home. The panel is... Problem 1.68P: Following the hot vacuum forming of a paper-pulpmixture, the product, an egg carton, is transported... Problem 1.69P Problem 1.70P: A computer consists of an array of five printed circuit boards (PCBs), each dissipating Pb=20W of... Problem 1.71P Problem 1.72P: The roof of a car in a parking lot absorbs a solar radiant flux of 800W/m2 , and the underside is... Problem 1.73P: Consider the conditions of Problem 1.22,but the surroundings temperature is 25°C and radiation... Problem 1.74P: Most of the energy we consume as food ¡s converted tothermal energy in the process of performing all... Problem 1.75P Problem 1.76P: The wall of an oven used to cure plastic parts is ofthickness L=0.05m and is exposed to large... Problem 1.77P: An experiment to determine the convection coefficientassociated with airflow over the surface of a... Problem 1.78P: A thin electrical heating element provides a uniformheat flux q0 to the outer surface of a duct... Problem 1.79P: A rectangular forced air healing duct is suspended fromthe ceiling of a basement whose air and walls... Problem 1.80P: Consider the steam pipe of Example 1.2. The facilitiesmanager wants you to recommend methods for... Problem 1.81P: During its manufacture, plate glass at 600°C is cooledby passing air over its surface such that the... Problem 1.82P: The curing press of Example 1.9 involves exposure of the plate to irradiation from an infrared lamp... Problem 1.83P: The diameter and surface emissivity of an electricallyheated plate are D=300mm and =0.80,... Problem 1.84P Problem 1.85P: A solar flux of 700W/m2K is incident on a flat—plate solar collector used to heat water. The area of... Problem 1.87P: In considering the following problems involving heat transfer in the natural environment (outdoors),... format_list_bulleted