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A hollow aluminum sphere, with an electrical heater in the center, is used in tests to determine the thermal conductivity of insulating materials.
A horizontal tube of 50-mm diameter, with a surface temperature of 34°C, is exposed to steam at 0.2bar Estimate the condensation rate and heat transfer rate
A horizontal uninsulated steam pipe passes through a large room whose walls and ambient air are at 300 K. The pipe of 150-mm diameter has an emissivity
A double-wall heat exchanger is used to transfer heat between liquids flowing through semicircular copper tubes. Each tube has a wall thickness of t = 3
A cylindrical shell of inner and outer radii, ri and r0, respectively, is filled with a heat-generating material that provides a uniform volumetric generation
A device that recovers heat from high-temperature combustion products involves passing the combustion gas between parallel plates, each of which is maintained
A dielectric fluid at atmospheric pressure is heated with a 0.5-mm-diameter, horizontal platinum wire. Determine the temperature of the wire
A fan that can provide air speeds up to 50 m/s is to be used in a low-speed wind tunnel with atmospheric air at 25°C. If one wishes to use the wind tunnel
A cold plate is an active cooling device that is attached to a heat-generating system in order to dissipate the heat while maintaining the system
A common procedure for cooling a high-performance computer chip involves joining the chip to a heat sink within which circular micro channels are machined.
A composite cylindrical wall is composed of two materials of thermal conductivity k A and k B, which are separated by a very thin, electric resistance
A composite refrigerator wall is composed of 2 in. of corkboard sandwiched between a?1 in. thick layer of oak and a 1/32 in. thickness of aluminum lining
A composite wall is comprised of two large plates separated by sheets of refractory insulation, as shown in the schematic
A concentric tube arrangement, for which the inner and outer diameters are 80 mm and 100 mm, respectively, is used to remove heat from a biochemical reaction
A concentric tube heat exchanger for cooling lubricating oil is comprised of a thin-walled inner tube of 25-mm diameter carrying water and an outer tube
A condenser-boiler section contains a 2-m x 2-m copper plate operating at a uniform temperature of Ts = 100°C and separating saturated steam
A contractor must select a roof covering material from the two diffuse, opaque coatings with a as shown. Which of the two coatings would result in a lower roof
A coolant flows through a rectangular channel (gallery) within the body of a mold used to form metal injection parts
A copper wire, 1/32-in.-OD, 2 in. long, is placed in an air stream whose temperature rises at Tair = (50 + 25t)°F, where t is the time in seconds
The wall is composed of a l0-mm-thick layer of beryllium oxide on the gas side and a 20-mm-thick slab of stainless steel (AISI 304) on the liquid side.
A composite spherical shell of inner radius r1 = 0.25 m is constructed from lead of outer radius r2 = 0.30 m and AISI 302 stainless steel of outer radius
Adhesive inter- faces between the insulation and the metallic strips are each characterized by a thermal contact resistance of Rt,c = 2.5 X 10-4 m
A commercial grade cubical freezer, 3 m on a side, has a composite wall consisting of an exterior sheet of 6.35-mm-thick plain carbon steel
A composite wall separates combustion gases at 2600°C from a liquid coolant at 100°C, with gas- and liquid-side convection coefficients of 50 and 1000 W/m2
A cooling coil consists of a bank of aluminum (k = 237 W/m · K) finned tubes having the core configuration of figure and an inner diameter of 13.8 mm