Refrigerant 134a exits a heat exchanger through a 0.75-in.-diameter tubing with a mass flow rate of 0.9 lb/s. The temperature and quality of the refrigerant are -15F and 0.05, respectively. Determine the velocity of the refrigerant in m/s.

The figure below shows a mixing tank initially containing minitial = 1500 lb of liquid water. The tank is fitted with two inlet pipes, one delivering hot water at a mass flow rate of 0.8 Ib/s and the other delivering cold water at a mass flow rate of 1.2 lb/s. Water exits through a single exit pipe at a mass flow rate of 2.5 lb/s. Hot Cold water water in = 0.8 lb/s in, = 1.2 Ib/s mynitial in3 = 2.5 lb/s Determine the amount of water, in Ib, in the tank after 0.5 hours.

A garden hose attached with nozzle is used to fill a 25-gallon bucket. The inner diameter of the hose is 1 in. and it reduces to 0.5 in. at the nozzle exit. If the mean velocity in the hose is 8 ft/sec, determine (a) the volume rate gal/min and mass flow rate in lbm/sec of water through the hose, (b) how long it will take to fill the bucket with water, and (c) the mean velocity in ft/sec of water at the nozzle exit.

A simple saturated refrigeration R-12 system operates at an evaporating temperature of -11  °C and a condensing temperature of 40  °C. Determine the volume flow in m3/sec rate for a refrigerant capacity of 1 kW.

5. Air whose density is 0.078 Ib/ft^3 enters the duct of an air-conditioning system at a volume flow rate of 450 CFM. If the diameter of the duct is 10 in, determine the velocity of the air in fpm at the duct inlet.

A mixing vessel initially contains 4133.3 lb of liquid fluid. The vessel is fitted with two inlet pipes, one delivering hot fluid at a mass flow rate of 0.768 lb/sec and the other delivering cold flu'd at a mass flow rate of 0.439 lb/sec. Fluid exits through a single pipe at a mass flow rate of 1.133 lb/sec. Calculate the amount of fluid, in lb, in the tank after 25 minutes.

A centrifugal air compressor compresses 200 cfm from 12 psia to 90 psia. The initial specific volume is 12.6 ft3/lb and the final specific volume is 3.25 ft3/lb. If the inlet suction line is 4 in. ID and the discharge line is 2.5 in. ID, determine (a) the change in flow work between the boundaries, ft-lb/min; (b) the mass rate of flow, lb/min; and (c) the change in velocity. Answer: (a) 324,000, (b) 15.88, (c) -12.9 fps

A water pump increases the water pressure from 15 psia to 80 psia. a. Determine the flow work, in Btu/lbm, required by the pump. Assume thatthe state of the water at pump inlet is saturated liquid and that the specificvolume remains constant during this process. b. Water enters this pump through a 1.5-in-diameter opening and exitsthrough a 2-in-diameter opening. Determine the velocity of the water at theinlet and outlet when the mass flow rate through the pump is 1.1 lbm/s

Water from a pressurized tank enters a horizontal pipe at a velocity of 2.5 m/s and 12 kPag. At the other end of the tank, a nozzle is connected which discharges the water to an empty tank that is open to the atmosphere. What is the velocity of the water in m/s just as it exits the nozzle?

4. In a steady flow apparatus,135kJ of work is done by each kg of fluid. The specific volume of the fluid, pressure and speed at the inlet are 0.37 m3/kg, 600 kpa, and 16 m/s. The inlet is 32 m above the floor, and the discharge pipe is at floor level. The discharge conditions are 0.62 m3/kg,-100 kpa, and 270 m/s. The total heat loss between the inlet and discharge is 9kJ/kg of fluid. In flowing through this apparatus, does the specific internal energy increase or decrease, and by how much? Draw a figure or FBD that will support the problem. Explain each step by step formula.