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A 40 student class is to be air conditioned with window air conditioning units each with 5 kw cooling capacities. a student at rest is assumed to dissipate heat at a rate of 360 kJ/h. there are 10 light fixtures in the room, each with a rating of 100 W. the rate of heat transfer into the class room through the walls and the windows is estimated to be 15000 kJ/h. if the room air temperature needs to be maintained at a constant 21 C how many window air conditioning units are required.
2 m3 of air in a rigid and insulated container that is fitted with a paddle wheel assembly. the air starts at 300 k and
glycolysis can be simplified asglucose 2pi 2adp 2nad -gt 2 pyruvate 2atp 2nadh 2h 2h2oa calculate the standard
a certain material 2.5 cm thick with a cross-sectional area of 0.1 m2 has one side maintained at 35oc and the other at
a seaplane is flying at 100 mph through air at 45 f. at what distance from the leading edge of the underside of the
In a refrigerator 1 kW is removed from the -10 degree C cold space and 1.3 kW is moved into the 30 degree C warm space. Find the exergy fluxes including direction associated with the two heat transfers.
a truck is traveling at v0 60mph when the driver applies the brakes to come to a stop. the deceleration of the truck
the lifetime of a lightbulb is normally distrbuted with a mean of 1000 hrs and a standard deviation of 30 hours. find the probability that a randomly selected light bulb last longer than 1045 hours.
describe the relationship between microstructure scale and material properties. provide an example for how
steam having pressure 4.0 mpa and temperature of 880 k enters the turbine installed in a power plant at the rate 500
an alloy named cylon is composed of 25 wt. of metal a and 75 wt. of metal b. if the densities of metals a and b are
nitrogen flows without gain or loss of heat through a horizontal duct cross-section is 1-ft by 2-ft throughout at
(a) Determine the blade angles at leading and trailing edges of both the rotor and stator at the mean radii, (b) Calculate the mass flow rate and the power required for each stage.
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