The heat-transfer rate to the surroundings from a person at rest is about 100 W. Suppose the ventilation system fails in an auditorium containing 2000 people. Assume there is no heat transfer hrough the auditorium walls. A. Determine the increase in internal energy of the air in the auditorium during the first 20 min after the ventilation system fails. Express your result in MJ. B. Considering the auditorium and all of the people as a system, determine the increase in intenal

2. For storimg purposes, water is to be moved from one pool to another that is 50 ft above the first one using a pump and an 8-in. inside-diameter pipe. The flow rate of the water is 2.5 ft’/s. There is a loss of available energy as 61 V²/2ft?/s² where Vis the average velocity of water inside the pipe. Determine the amount of shaft power required, in hp.

ft-lb 7. One pound of air R = 53.3 is compressed isothermally in a closed system from ib-R 15 psia and 80°F to 90 psia. Compute the heat transfer.

The figure provides data for water entering and exiting a tank, where V1 = 20 m/s and V2 = 1 m/s. At the inlet and exit of the tank, determine the mass flow rate, each in kg/s. Also find the time rate of change of mass contained within the tank, in kg/s.

A closed system loses energy by heat transfer at the rate of 10kJ/s. Write the energy balance for this problem if the system operates at steady state

Water is being pumped from an atmospheric source on the ground at the rate of 200 liter/minute to a pressurized tank on top of an office building through a constant diameter pipe.  The discharge to the pressurized tank is 20 meters off the ground and the tank has a gauge pressure of 5 bar.  Ignoring frictional losses, determine the    a)power the pump must supply the fluid in W (Correct Answer is 2321 W)   By performing an energy balance around the pump and ignoring friction and any changes in height between the inlet and outlet of the pump determine the:   b) increase in pressure across the pump in psi (Correct Answer is 101 psi)

Air is compressed polytropically in a cylinder according to pV=C. The work required is 180 kJ. 4. Determine a. change of internal energy b. The heat transferred