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A 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 room through the walls and the windows is estimated 15,000 kJ/h. a) If the room air is to be maintained at a constant temperature of 21oC, determine the number of window air-conditioning units required. b) Let us assume that a person dissipates 5 times more energy when dancing. For the same number of air-conditioning units and the same desired temperature, how many people should be invited to the room for a party featuring a few hours of dancing?
Describe the machinability evaluation criteria, is it a quantitative or qualitative evaluation and describe the High Speed Machining of Steel/Iron or Aluminium
If the final pressure is 1.0 MPa, determine (a) the temperature (°C) at the final state and (b) the heat transfer (kJ) during this process.
A piston-cylinder device contains 0.005 m3 of liquid water and 0.9 m3 of water vapor in equilibrium at 600 kPa. Heat is transferred at constant pressure until the temperature reaches 200°C.
describe possible methods that can be used to separate materials such as polymers, aluminium alloys and steels from one another.
consider some hypothetical x - y - ion pair for which the equilibrium interionic spacing and bonding energy values are
Kinetic and potential energy effects can be ignored. Evaluate the work required and the heat transfer, each in kW.
a circular coil having 19 turns and a radius of r 17.6cm carries a current of 3.80a. it is placed in a uniform
Determine the minimum coefficient of static friction between the crate and the truck so that the crate does not slide relative to the truck.
A lap joint needs to be designed using 20-mm diameter bolts to carry a load of 120 kN on the connecting plates. If the shear stress in each rivet is not to exceed 90 MPa, determine the number of bolts needed.
during this process heat is exchanged with surrounding such that the entire air remains at 30 degree celsius at all times.determine the heat transfer for this process.
When the average grain diameter is increased to 3.20x10-2 mm, what is the modulus of resilience (in J/m^3) if the modulus of elasticity is known to be 134 GPa?
baseline validationdetermine the natural frequencies of the system. for the baseline system i get natural frequencies
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