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Reconsider Prob. 11-56. Using EES (or other) software, study the effects of compressor and turbine isentropic efficiencies as they are varied from 70 to 100 percent on the rate of refrigeration, the net power input, and the COP. Plot the T-s diagram of the cycle for the isentropic case.
Prob. 11-56
Air enters the compressor of an ideal gas refrigeration cycle at 12°C and 50 kPa and the turbine at 47°C and 250 kPa. The mass flow rate of air through the cycle is 0.08 kg/s. Assuming variable specific heats for air, determine (a) the rate of refrigeration, (b) the net power input, and (c) the coefficient of performance.
An intersection approach has three lanes, permitted left turns, and 6% left-turning volume with a through vehicle equivalent of 5.0 tvu/left turn. The saturation flow rate for through vehicles under prevailing conditions is 1,700 veh/hg/ln.
A vehicle is traveling on a curved section of a road of radius 2500 feet at a speed of 60 mi/h. The motorist suddenly applies their brakes, causing the automobile to slow down at a constant rate. After 8 seconds the speed has been reduced to 45 mi..
Design a hollow steel shaft with an inside diameter 1/3 that of the outside diameter. The shaft transmits 200 kW at a speed of 20 Hz. The allowable shearing stress is 55 MPa, and the allowable angle of twist is 1 degree per meter of length.
A 30ft thick clay layer with doudble drainage settles 3 inches, in a time period of 2 years. The clay has a coefficient of consolidation of .000791 in^2/sec. a) Calculate the ultimate primary consolidation settlement. b) how long will it take to sett..
A young engineer has invented holographic mobile phones and has approached a venture capital company to invest in it. The venture capital company considers the product to be an all or nothing product
Determine the minimum horizontal force necessary for 200 lb man to scale crevice (using his feet and back). The coefficient of static friction between his shoes and his back against the wall is 0.4.
Find the value for PORTB after the execution of the following code:
In older houses one will often find steel waterpipings whereascopper tubing is now generally used. While carrying out renovationsplumbers often interconnect the steel pipings with Copper tubings.Is this a sound practice? Explain.
Determine the height of capillary rise of benzene in a clean glass tube of 0.01 inches ID at a temperature of 20 degrees Celsius. Assume λ = 65 degrees Celsius.
Choose two of the five Respiratory Hazards. Provide a brief explanation of each hazard and describe a situation in which you may encounter them. What effects would each of these hazards have on your body
A vane, 10 cm long and 8 cm in diameter, was pressed into soft clay at the bottom of a bore hole. Torque was applied and gradually increased 45 N-m when failure took place. Subsequently the vane rotated rapidly so as to completely remould the soil. T..
In a certain chemical plant, a closed tank contains ethyl alcohol to a depth of 50 ft. Air at a pressure of 25 psi fills the gap at the top of the tank. Determine the pressure at a closed valve attached to the tank 10 ft above its bottom.
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