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Refrigerant-134a enters a 28-cm diameter pipe steadily at 200 kPa and 20°C with a velocity of 5 m/s. The refrigerant gains heat as it flows and leaves the pipe
R-134a is throttled in a line flowing at 25oC, 750 kPa with negligible kinetic energy to a pressure of 165 kPa. Find the exit temperature and the ratio of exit
Quiescent carbon dioxide at 600 kPa and 400 K is accelerated isentropically to a Mach number of 0.5. Determine the temperature and pressure
Refrigerant-134a enters the compressor of a refrigerator as superheated vapor at 0.14 MPa and -10°C at a rate of 0.12 kg/s, and it leaves at 0.7 MPa and 50°C.
Oxygen gas is compressed in a piston-cylinder device from an initial state of 0.8 m3/kg and 25°C to a final state of 0.1 m3/kg and 287°C.
Oxygen at 50 lbf/in.2, 200 F is in a piston/cylinder arrangement with a volume of 4 ft3. It is now compressed in a polytropic process with exponent, n = 1.2
Oxygen at 50 lbf/in 2, 200 F is in a piston/cylinder arrangement with a volume of 4 ft3. It is now compressed in a polytropic process
Pressurized feedwater in a steam power plant is to be heated in an ideal open feedwater heater that operates at a pressure of 0.5 MPa with steam
Plot the enthalpy of vaporization of steam as a function of temperature over the temperature range 10 to 200°C by using the Clapeyron equation and steam data
Pentene, C5H10 is burned with pure oxygen in an SSSF process. The products at one point are brought to 1300 R and used in a heat exchanger
Propane is compressed isothermally by a piston- cylinder device from 200°F and 200 psia to 800 psia. Using the generalized charts, determine the work done
One kmol of ethane (C2H6) is burned with an unknown amount of air during a combustion process
One kmol of H2 at 25°C and 1 atm is burned steadily with 0.5 kmol of O2 at the same state. The H2O formed during the process is then brought to 25°C
One lbm of butane (C4H10) is burned with 25 lbm of air that is at 90°F and 14.7 psia. Assuming that the combustion is complete and the pressure of the products
One means of improving the performance of a refrigeration system that operates over a wide temperature range is to use a two-stage compressor
Prove for an ideal gas that (a) The P = constant lines on a T-v diagram are straight lines
One kilo mole of water vapor at 100 kPa, 400 K, is heated to 3000 K in a constant pressure SSSF process.
One kilogram of ammonia (NH3) is contained in a spring-loaded piston/cylinder as saturated liquid at -20°C. Heat is added from a reservoir at 100°C
One kilogram of ammonia in a piston/cylinder at 50°C, 1000 kPa is expanded in a reversible isobaric process to 140°C. Find the work and heat transfer
One kilogram of butane (C4H10) is burned with 25 kg of air that is at 30°C and 90 kPa. Assuming that the combustion is complete and the pressure of the products
Assuming constant specific heats for both the air and water at room temperature, determine (a) The final equilibrium temperature in the room
One ton (1000 kg) of liquid water at 80°C is brought into a well-insulated and well-sealed 4-m = 5-m = 6-m room initially at 22°C and 100 kPa
One technique for operating a steam turbine in part-load power output is to throttle the steam to a lower pressure before it enters the turbine.
One pound mass of ammonia (NH3) is contained in a linear spring-loaded piston/cylinder as saturated liquid at 0 F
One means of air-conditioning hot summer air is by evaporative cooling, which is a process similar to the SSSF adiabatic saturation process.