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A room has 1000 ft2 of surface, of which 120 ft2 is to be heated, and the balance has an average surface temperature of 60°F. The air temperature in the room is 68°F. The room is occupied by light clothed adults at rest. Determine the surface temperature of the heated panel necessary to produce comfort if the air velocity is 20 fpm.
a cylinder 10 feet long has an ouside diameter of 2 inches and a 1mm thick wall. the yield strength of the wall
a piston-cylinder device contains a liquid-vapor mixture of water at 300k. during a constant-pressure process 750kj of
a simply supported beam of length 18 ft. is subjected to a trapezoidally distributed load that has a value of 3 kipft
refrigerant 134a enters a condenser operating at steady state at 70 lbfin.2 160f and is condensed to saturated liquid
A first class lever, in static equilibrium, has a 50lb resistance force and 15lb effort force. The lever's effort force is located 4 ft from the fulcrum.3. Using static equilibrium calculations, calculate the length from the fulcrum to the resista..
a meeting hall is to be maintained at 25 degc db and 18 degc wb. the barometric pressure is 101.3 kpa. the space has a
Water vapor at 300 C, 35 bars (state 1) expands to 5.0 bars (state 2) using an adiabatic throttling valve. The ambient is at T = 25 C, 1 bar. Simplify the energy conservation and availability balance equation for the current problem. Calculate the ex..
consider a steam power plant that operates on the regenerative rankine cycle with one open feedwater heater. the steam
four forces are applied to a W200x35.9 rolled beam as shown. determine the principal stresses and maximum shearing stress at point a.
air enters a 0.6-m-diameter fan at 16c105kpa with a volumetric flow rate of 0.35m3s. assuming ideal gas behavior
Carbon dioxide enters an adiabatic compressor at 100kPa and 300K at a rate of 0.5kg/s and exits at 600kPa and 450K. Considering constant specific heat, determine (a) isentropic efficiency of the compressor (b) the rate of entropy change in (kW/K) ..
R134a rests in a compressed fluid can at 120psia, and a specific volume of 0.38ft3/lbm. What is its temperature and quality? Half of the mass is now vented off to the atmosphere. The can is allowed to exchange heat with the surroundings at 100°F unt..
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