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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.
one kilogram of air as an ideal gas executes a carnot power cycle having a thermal efficiency 50. the heat transfer to
calculate the work necessary to compress air in an isolated cylinder piston with an intial volume of 6.0ft3 and a final
the surface of a steel machine member is subjected to the stresses of sigma1100 mpa sigma220 mpa sigma3-80 mpa. what
an air-standard diesel cycle operates with a compression ratio of 18. at the beginning of the compression process the
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a shrink fit assembly is to be performed on a pin and collar. with the starting dia. being 0.875 the pin needs to be
iron undergoes a polymorphic transformation at 912degc. at a temperature just below 912degc it has a bcc structure a
determine diameter of a circular rod of ductile material with a fatigue strength ,e=280 Mpa. Add a tensile yield strength of 350 Mpa. The member is subjected to a varying axial load from 700 kN to -300kN. Assume Kt=1.8 and factor of safety=2.
during the construction of a highway by-pass earthmoving equipment costing 40000 was purchased for use in transporting
a bar of mild steel has a diameter of 75 mm and is placed inside a hollow aluminum cylinder of internal diameter 75 mm
What is the total rate of heat transfer to the air? What is the pressure drop associated with the airflow?
consider the annular triangular fin fabricated from an alloyed aluminumk180 wmk of lenght l10mm tickness t1mm. the base
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