Finding exit velocity from air nozzle

3. Air enters a nozzle operating at steady state at 800 ºR with a negligible velocity and exits the nozzle at 570 ºR. Heat transfer occurs from the air to the surroundings at a rate of 10 Btu per pound of air flowing. Assuming ideal gas behavior and neglecting potential energy effects, determine the velocity at the exit in ft/s.

Finding work and heat transfer

Air initially at 100 psia, 500 F undergoes an internally reversible process to 45 psia. For each of the following cases, determine for 10 lbm of air the heat transfer and work, each in Btu, and show the processes on P-v and T-s coordinates. The process is: a) Isothermal b) Adiabatic (Hint: look at other assumptions above) c) Constant volume

An ideal vapor–compression refrigeration cycle uses R-134a

An ideal vapor–compression refrigeration cycle uses R-134a as the working fluid in an air-conditioning system. The refrigerant enters the compressor as a saturated vapor at 40 °F and leaves the condenser as a saturated liquid at 130 °F. The mass flow rate of the refrigerant is 1.5 lbm/s. Calculate the following: a. The heat transfer rate in the condenser b. The heat transfer rate in the evaporator

Piston-cylinder device

A piston-cylinder device has a volume of 0.1 cubic meters and contains 0.5kg of steam at 0.4 MPa. Heat is transferred to the steam until the temperature is 300 degrees Celsius, while the pressure remains constant. Determine the heat transfer for this process in kilojoules. (My professor told us to use steam tables not the ideal gas law. Not sure how to do this.)

Thermodynamic concept

See attached file for full problem description.