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A common arrangement for heating a large surface area is to move warm air through rectangular ducts below the surface. The ducts are square and located midway between the top and bottom surfaces that are exposed to room air and insulated, respectively.
For the condition when the floor and duct temperatures are 30 and 80°C, respectively, and the thermal conductivity of concrete is 1.4 W/m · K, calculate the heat rate from each duct, per unit length of duct. Use a grid spacing with ?x = 2?y, where ?y = 0.125L and L = 150mm.
Air is compressed steadily in a compressor from 100kPa and 300 K to 1 Mpa and 500 K. The compressor is not well insulated and a heat loss of 40 KJ/kg occurs during the process. Assuming the changes in kinetic and potential energies are negligible, de..
a steam turbine operates at steady state with inlet conditions of p1 5 bars t1 320degc. steam leaves the turbine at a
the bottom hole pressure in a well has been declining at a constant rate of 1.4 psiday. the reservoir characteristics
tow forces p and q are applied as shown at a point a of a hook support. knowing that p 75 n and q125 n determine
the blades of a wind turbine spin due to a liftforce similarto that of an air plane wing. the magnitude ofthe liftforce
a fixed amount of water vapor initially at 20mpa 520c is cooled at constant volume until its temperature reaches
If the isentropic efficiency of the compressor is 72% and the pressure ratio is 2.2:1, for an inlet pressure and temperature of 1 bar and 25oC, calculate the compressor outlet temperature, the compressor outlet density and the power required to drive..
A metal plate (k = 180 w/(m*k), p = 2800 kg/m^3, cp = 880 J/(kg*k)) with a thickness of 1 cm is being cooled by air at 5 degrees C with a convection heat transfer coefficient of 30 w/(m*k). If the initial temperature of the plate is 300 degrees C, de..
a hair dryer consumes 1200w of electric power when running the inlet volume flow rate and the exit velocity of air are
water backs up behind a concrete dam as shown. leakage under the foundation gives a pressure distribution under the dam
a car is climbing the hill of slope theta1 at a constant speed v. if the slope decreases abruptly to theta2 at point a
refrigerant-134a enters the expansion valve of a refrigeration system at 160psia as a saturated liquid and leaves at
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