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In an actual refrigeration cycle using R-12 as the working fluid, the refrigerant flow rate is 0.05 kg/s. Vapor enters the compressor at 150 kPa, ?10°C, and leaves at 1.2 MPa, 75°C.
Find the power curve for the turbine. Illustrate the power curve together with one for which Cp always equals Cp,max (until reaching rated wind speed).
A horizontal, insulated cylinder has a frictionless piston held against stops by an external force of 500 kN. The piston cross-sectional area is 0.5 m2, and the initial volume is 0.25 m3. Argon gas
The system under consideration is an electronic circuit board, oriented vertically in 27 degree C air. Calculate the circuit board temperature for each case to see which option gives the best results.
A mass density of 640 kg/m3. The rotor turns at 120 rpm. Ignoring other potential problems, are any flapwise vibration problems to be expected? Explain.
A slab of aluminum of area 2m^2 and with a mass 9 kg is lying on some insulation on the surface of the moon during daytime and is equilibrated at a temperature To= 140 degrees C.
Saturated water vapor at 200 kPa is in a constant pressure piston cylinder. At this state the piston is 0.1 m from the cylinder bottom. How much is this distance and the temperature if the water is
Determine the mass of methane gas stored in a 2 m3 tank at ?30°C, 3 MPa. Estimate the percent error in the mass determination if the ideal gas model is used.
An engine operates on the air standard diesel cycle with inlet air conditions of 77 F and 14.5 psia. The compression ratio is 16, and the heat added is 700 Btu/lbm. Determine the max temp and pressu
An adiabatic steam turbine operates at steady state with inlet conditions P1=500 kPa, T1=360 C, steam leaves the turbine at a pressure P2=100 kPa. The KE and PE change between inlet and outlet are
A swimming pool is drained using a hose. The hose has 20 mm internal diameter, a roughness height of 0.2 mm and is 30 m long. Estimate the depth of the water in the swimming pool.
A car tire pressure is 2.2 bar at 25 C. If the temperature drops overnight to 5 C and if the atmospheric pressure is 1 bar, what will be the absolute pressure of the air in bar and p.s.i? Consider
The pipe is 150 m long and the pressure drop between the inlet and exit sections is 150 kPa. Find the volume flow rate through the pipe.
Determine ( a ) The proper distance between compressor stations, in miles. ( b ) The optimum interstage pressure and compression ratio for each compressor stage.
If you wanted to transfer 100 kJ from on reservoir to the other, what would the change in entropy of the two reservoirs be?
A 0.25kg block is held compressed 0.1m against a spring (k=1000N/m). What is the max height of the block after it is released?
A 3000lb car is traveling at 60mi/h up an inclined surface of 5° when the brakes are applied, creating a constant breaking force that brings the car to a stop in 5s. What is the magnitude of th
A double acting cylinder with a single rod must produce a thrust of 80KN and move out with a velocity of 3mm/s on the out stroke. The operating pressure is 100barg. Calculate the bore diameter and t
A Carnot heat engine operates between 40C and 320 C. What is the thermal efficiency? if the work output is 200 kJ/kg, what is the quality of state A (in 320C)?
An injected slug of tracer material flows with its carrier fluid down a long, straight pipe in dispersed plug flow. At point A in the pipe the spread of tracer is 16 m. At point B, 1 kilometer downs
Calculate the percent of the total resistance for external diffusion, internal diffusion and surface reaction. Qualitatively how each of the resistances (e.g external, internal and reaction) change
A piston/cylinder system contains superheated vapor initially at 400C and 600 kPa. Determine the total entropy generation.
Estimate the potential problems with a plant effluent that contains a pesticide with an LC50 for fish of 0.01 mg/L at concentrations exceeding 0.01 mg/L.
A 48-tonne ferry strikes a dock at 3 km/h. What average force does it exert on a dock if it is brought to rest over a distance of 0.2 m?
A tire of a car having a volume of 0.6 m^3 contains air at 280 kPa. Determine the mass of air in kg contained in the tire at 25 degrees Celsius.