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If the plate is installed 2 m from the leading edge of a roof and flushes with the roof surface, what is the rate of convective heat loss?
The defroster of an automobile functions by discharging warm air on the inner surface of the windshield. To prevent condensation of water vapor on the surface
The convection coefficient for flow over a solid sphere may be determined by submerging the sphere which is initial1y at 25°C, into the flow
The condenser of a steam power plant contains N = 1000 brass tubes (kt = 110 W/m · K), each of inner and outer diameters, Di = 25 mm and Do = 28 mm.
The condenser of a steam power plant consists of a square (in-line) array of 625 tubes, each of 25-mm diameters;
The addition of aluminum fins has been suggested to increase the rate of heat dissipation from one side of an electronic device 1 m wide and 1 m tall.
The air inside a chamber at T8,i = 50°C is heated convectively with h; = 20 W/m2 · K by a 200-mm-thick wall having a thermal conductivity of 4 W/m ·K
The chief engineer at a university that is constructing a large number of new student dormitories decides to install a counter flow concentric tube
The 50-mm peephole of a large furnace operating at 450°C is covered with a material having t = 0.8 and p = 0 for irradiation originating from the furnace
The compartment heater of an automobile exchanges heat between warm radiator fluid and cooler outside air, the flow rate of water is large compared to the air
The bottom of a copper pan, 150 mm in diameter, is maintained at 115°C by the heating element of an electric range.
The air passage for cooling a gas turbine vane can be approximated as a tube of 3-mm diameter and 75-mm length.
The absorber plate and the adjoining cover plate of a flat-plate solar collector are at 70 and 35°C, respectively, and are separated by an air space of 0.05 m
Special coatings are often formed by depositing thin layers of a molten material on a solid substrate
Steady-state temperatures (K) at three nodal points of a long rectangular rod are as shown. The rod experiences a uniform volumetric generation rate of 5 X 107
Spheres of 40-mm diameter heated to a uniform temperature of 400°C are suddenly removed from the oven and placed in a forced-air bath operating at 25°C
Solar flux of 900 W/m2 is incident on the top side of a plate whose surface has a solar absorptivity of 0.9 and an emissivity of 0.1.
Suppose that a pipe carrying a hot fluid with an external temperature of Ti and outer radius ri is to be insulated with an insulation material of thermal
Steam having a quality of 98% at a pressure of 1.37 A? 105 N/m2 is flowing at a velocity of 1 m/s through a steel pipe of 2.7 cm OD and 2.1 cm ID
Steel balls 12 mm in diameter are annealed by heating to 1150 K and then slowly cooling to 400 K in an air environment for which T8, = 325 K and h = 20 W/m2 · K
Steam at a temperature of 250°C flows through a steel pipe (AISI 1010) of 60-mm inside diameter and 75-mm outside diameter
Stainless steel (AISI 304) ball bearings, which have uniformly been heated to 850°C, are hardened by quenching them in an oil bath that is maintained at 40°C.
The 150-mm-thick wall of a gas-fired furnace is constructed of fire-day brick (k = 1.5 W/m · K. p = 2600 kg/m · c p = 1000 J/kg · K) and is well insulated
Superheated steam at 575°C is routed from a boiler to the turbine of an electric power plant through steel tubes (k = 35 W/m · K) of 300 mm inner diameter
Steel is sequentially heated and cooled (annealed) to relieve stresses and to make it less brittle.