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A class room that normally contains 40 people is to be air conditioned with window air conditioning units of 5 -kW cooling capacity. A person at rest may be assumed to dissipate heat at a rate of about 360 kJ/h. There are 10 light bulbs in the room, each with a rating of 100 W.The rate of heat transfer to the classroom through the walls and the windows is estimated to be 15,000 KJ/h.If the room air is to be maintained at a constant temperature of 21 degrees celsius, determine the number of window air conditioning units required.
at intel 0.00005 of manufactured chips have defects. in a day 5 million chips are produced. what is the probability
Wind turbines are becoming more and more common as a method of energy production, wind turbines by their very nature are dynamic and are subject to and create their own internal and external kinematics and kinetics.
What is the difference between corrosion and stress corrosion cracking of pipelines? Which of them is more dangerous and why?
calculate stoichiometric af ratiop of benzene c6h6. in an actual combustion of benzene the airfule ratio was 121.
two 415000-lb locomotives pull 41 205000-lb coal hoppers. the train starts from rest and accelerates uniformly to a
100 kg of liquid water at 25C and 50 kg of ice at 0C are placed in an isolated container. (a) (b) (c) Find the initial volume of the liquid-ice mixture, in m3. Determine the volume after all the ice is melted, in m3. Will the temperature of the li..
a 20 mw radial flow hydraulic turbine is to be designed with a head of 70 m and a speed of 90 rpm. a geometrically
the temperature disribution along a cylindrical rod of length l is given by the function txaxlbx2lcsinpixlde-alphaxl 0
a gas contained in a piston cylinder assembly undergoes a process from state 1 to state 2 defined by the following
a heat engine is composed of of a monatomic ideal gas which runs in the following cycle at point a the pressure is 2.6
Water is being pumped from a large lake to a reservoir 30 m above at a rate of 5x10-3 m3/s by a 12 kW (shaft) pump. If the irreversible head loss of the piping system is 8m, determine the mechanical efficiency of the pump.
a small sphere of reference-grade iron with a specific heat of 447 jkgk and a mass of 0.515 kg is suddenly immersed in
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