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A steady supply of 1.0 m3/s air at 25°C, 100 kPa, 50% relative humidity is needed to heat a building in the winter
A steady stream of equimolar N2 and CO2 mixture at 100 kPa and 18°C is to be separated into N2 and CO2 gases at 100 kPa and 18°C
A small expander (a turbine with heat transfer) has 0.05 kg/s helium entering at 1000 kPa, 550 K and it leaves at 250 kPa, 300 K
A small elevator is being designed for a construction site. It is expected to carry four 75-kg workers to the top of a 100-m tall building in less than 2 min.
A small dam has a pipe carrying liquid water at 150 kPa, 20?C with a flow rate of 2000 kg/s in a 0.5 m diameter pipe. The pipe runs to the bottom of the dam
A sluice gate dams water up 5 m. There is a small hole at the bottom of the gate so liquid water at 20oC comes out of a 1 cm diameter hole.
A ski lift has a one-way length of 1 km and a vertical rise of 200 m. The chairs are spaced 20 m apart, and each chair can seat three people
A small water pump on ground level has an inlet pipe down into a well at a depth H with the water at 100 kPa
A small flexible bag contains 0.1 kg ammonia at -10oC and 300 kPa. The bag material is such that the pressure inside varies linear with volume
A spherical balloon contains 2 kg of R-22 at 0°C, 30% quality. This system is heated until the pressure in the balloon reaches 600 kPa.
A spherical balloon contains 10 lbm of air at 30 psia and 800 R. The balloon material is such that the pressure inside is always proportional
A soap bubble has a surface tension of S = 3* 10-4 N/cm as it sits flat on a rigid ring of diameter 5 cm. You now blow on the film to create a half sphere
A small, high-speed turbine operating on compressed air produces a power output of 100 W. The inlet state is 400 kPa, 50°C, and the exit state is 150 kPa
A rope hangs over a pulley with the two equally long ends down. On one end you attach a mass of 5 kg and on the other end you attach 10 kg.
A room is heated with an electric space heater on a winter day. Examine the following control volumes, regarding heat transfer and work, including sign.
A room is filled with saturated moist air at 25°C and a total pressure of 100 kPa. If the mass of dry air in the room is 100 kg, the mass of water vapor.
A room is cooled by circulating chilled water through a heat exchanger located in a room. The air is circulated through the heat exchanger by a 0.25-hp
A room contains air at 70°F and 14.6 psia at a relative humidity of 85 percent. Determine (a) The partial pressure of dry air
A sealed rigid vessel has volume of 35 ft3 and contains 2 lbm of water at 200 F. The vessel is now heated.
A saturated air-water vapor mixture at 20 oC, 100 kPa, is contained in a 5-m3 closed tank in equilibrium with 1 kg of liquid water. The tank is heated to 80oC.
A sales person selling refrigerators and deep freezers will guarantee a minimum coefficient of performance of 4.5 year round. How would you evaluate that?
The mass fraction of steam that condenses at the turbine exit. You should solve the problem in a step by step. You should include all the units which are needed
A sheet of rubber is stretched out over a ring of radius 0.25 m. I pour liquid water at 20oC on it so the rubber forms a half sphere (cup).
A sharp-edged orifice is used to measure the flow of air in a pipe. The pipe diameter is 100 mm and the diameter of the orifice is 25 mm
A semi permeable membrane is used for the partial removal of oxygen from air that is blown through a grain elevator storage facility