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The presence of a small amount of air may cause a significant reduction in the heat rate to a water-cooled steam condenser surface. For a clean surface with pure steam and the prescribed conditions, the condensate rate is 0.020 kg/m2 · s. With the presence of stagnant air in the steam, the condensate surface temperature drops from 28 to 24°C and the condensate rate is reduced by a factor of 2. For the air-steam mixture, determine the partial pressure of air as a function of distance from the condensate film.
a fixed mass of water m initially a saturated liquid is brought to a saturated vapor condition while its pressure and
why are tangent points so important when sketching, drawing on paper with instruments, or using cad?
a composite rod consists of two different materials a and b each of length 0.5 l. the thermal conductivity of material
A condition exists where it is necessary to cool and dehumidify air from 80°F db, 67°F wb to 60°db, and 54°F wb. Discuss the feasibility of doing this in one process with a cooling coil
a rod has a cross sectional area of 1 cm2. the material has the following strength characteristics beyond which the rod
a stone is thrown vertically upward from a point on a bridge located 40 m above the water. knowing that it strikes the
in an actual refrigeration cycle using r-12 as the working fluid the refrigerant flow rate is 0.05 kgs. vapor enters
The centerline of the tube coincides with the focal line of the collector, and a glass sleeve is placed outside the tube to minimize the heat losses. If solar energy is transferred to water at a net rate of 400 Btu/h per ft length of the tube, det..
an insulated rigid tank initially contains 1.5 lbm. of helium at 80 deg f and 50 psi. a paddle wheel with a power
the block b is suspended from a cable that is attached to the block at e wraps around three pulleys and is tied to the
A rigid tank of 0.5 m^3 is filled with saturated liquid water at 300c. so if we open a valveat the bottom of the container and make the liquid is withdrawn from the container and if the temp is still constant but the the heat transferred to the water..
a 12 ft by 12 ft square room has one exterior wall with a surface temperature of 58f and three interior wall surface
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