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Problem 1:
I will likely end up teaching this class again next semester in the same room. It has been a cool summer, but am a little worried that our classroom will be too hot late in the spring and want to know now, so proper steps can be taken to make sure the room is comfortable. You can help by performing the energy balance of a full classroom. We have 37 people in our class (including the instructor). The building is cooled by air conditioning units that provide 5 kW of cooling capacity. Each person dissipates about 360 kJ/h. There are about 35 light bulbs in the room, each with a rating of about 40 W. The rate of heat transfer through the walls and windows to the room will probably be around 15,500 kJ/h. Determine the total number of air conditioning units needed to maintain the room at 22 oC
Problem 2:
A bird weighing 1.7 kg leaves the ground and flies to a There are about 35 light bulbs in the room, each with a rating of about 40 W. The rate of heat transfer through the walls and windows to the room will probably be around 15,500 kJ/h. Determine the total number of air conditioning units needed to maintain the room at 22 oC height of 70 m, where it attains a velocity of 22 m s-1. What is the change in energy involved in this process.
a steam power plant operates on an ideal rankine cycle with boiler pressure of 100 bar no pressure drop across the
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estimate the machining time that will be required to finish a vertical flat surface of length 100 mm and depth 20 mm by
A particular polymer has a critical stress intensity parameter of 5 MPa?m^1/ 2 and a strength of 150 MPa. It is being used as a plate that experiences tension. The maximum stress it is designed to experience is 80% of its strength.
a piston-cylinder contains argon at a temperature of 50 degc a pressure of 500 kpa and a volume of 10 liters. a
The slope of the channel is 0.0020 ft/ft. Compute a chart showing the relationship be- tween reservoir elevation and discharge into the channel.
a large tower is to be supported by a series of steel wires.it is estimated that the load on each wire will be 11100N. determine the minimum required wire diameter assuming a factor of safety of 2 and a yield strength of 1030MPa.
a solid cylinder has a mass of 5kg a diameter of 9cm and is 60cm high. it starts at point a and must be moving at 2ms
in kidney dialysis a persons blood is passed through a bath that contains several ions and molecules. the blood is
five kg of r-22 refrigerant at 3 bar and saturated vapor is contained in a closed rigid tank. a process cools the r-22
steam at 40?c condenses on the outside of a 5-m-long 3-cm-diameter thin horizontal copper tube by cooling water that
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