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A house built on a riverside is to be cooled in summer by utilizing the cool water of the river, which. flows at an averagetemperature of 15°C. A 15-m-long section of a circular duct of 20-cm diameter passes through the water. Air enters theunderwater section of the duct at 25°C at a velocity of 3 m/s. Assuming the surface of the duct to be at the temperature ofthe water. determine the outlet temperature of air as it leaves the underwater portion of the duct. Also, for an overall fanefficiency of 55 percent, determine the fan power input needed to overcome the flow resistance in this section of the duct.
twenty pounds of a gas mixture is contained in a tank with volume 30 cubic feet at 30 psia and 70 f. the gas mixture
Thermocouples inserted in the bar are used to measure temperatures at distances of x 1 = 10 mm and x 2 = 25 mm from the surface.
an air-standard otto cycle has a compression ratio of 8 and the temperature and pressure at the beginning of the
The data listed below are claimed for power cycles operating between hot and cold reservoirs at 1000 K and 400 K, respectively. For each case determine whether such a cycle is in keeping with the first and second laws of thermodynamics.
a 10-lb block is attached to an unstretched spring of constant k12lbin. the coefficients of static and kinetic friction
ateam at 5 bar 320 c enters a steady state turbine with a volumetric flow rate of 0.65m3s and evpands adiabatically to
A gaseous mixture with a molar analysis of 20% CO2, 40% CO, and 40% O2 enters a heat exchanger and is heated at constant pressure. An equilibrium mixture of CO2, CO, and O2 exits at 3000 K, 1.5 bar. Determine the molar analysis of the exiting mixt..
two weights are attached to a wheel pully m1 is 2.00 slugs and m2 is 1.00 slugs use kinetics to calculate the anguler
Who can request a standard? How often are standards reviewed? List standards associated with the welding of manufactured goods
an otto cycle has the lowest t as 520 r and the lowest p as 12 psi. the highest t is 4500 r and combustion adds 500
an insulated piston-cylinder device contains 2l of saturated liquid water at a pressure of 150kpa-which is constant
a rigid copper tank initially containing 1 m3 of air at 295 k carrying air at 295 k 15 bar is connected by a valve to a
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