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A reverse Brayton cycle refrigeration system uses air as the working fluid. The turbine and compressor operate ideally, and regeneration (recuperation) is used in the cycle. The pressure ratio is 5. Air enters the compressor at 12.5 psia, 70°F. After the compressor, the air is cooled to 120°F by rejecting heat to the atmosphere. The air is then cooled to -250°F by passing through a heat exchanger and rejecting heat to the air returning to the compressor. The air enters the turbine at -250°F. Determine the system COP and the lowest temperature of the system. Use constant specific heat at room temperature.
to find the minimum distance b to get the ball over the top im not sure weather you use conservation of mech energy or
five 100 ohm resistors each having 5 tolerance are connected in series. what is the overall nominal resistance and
the position of a point p on a line is given by the equation x t sinpi t2. the point starts moving at t0. find the
An internal combustion engine is driving an electrical dynamometer. The torque arm length is 0.5 m and the force is 200 N. A tachometer indicates that the shaft speed is 3490 rpm. What are the engine torque and power output?
Ten cubic feet of air is cooled at a constant pressure of 80 psi. The initial temperature is 180 0F and the final temperature is 100 0F. Assume air is an ideal gas, Cp = 0.241 Btu/lb 0R and Cv = 0.173 Btu/lb 0R and R = 1545 lbf/lbmol 0R, M = 28.97 lb..
1. water is the working fluid in an ideal rankine cycle. superheated vapor enters the turbine at 10 mpa 4800c and the
a refrigerant at -40degc flows inside a copper pipe inside diameter 3 cm outside diameter 3.4 cm with a convective
two blocks a and b are connected by a cord passing over two pulleys c and d and e and f. at t 0 block a starts moving
an adiabatic gas turbine expands air at 3447 kpa and 427degc to 415 kpa and 120degc. if the volume flow rate at the
a turbine produces 2 mw of power while accepting steam at 3 mpa and 400 c and rejecting steam at 50 kpa and 100c. find
Air exits a turbine at 250 kPa, 3000C at a flow rate of 1000 l/s. Determine the mass flow rate in m/s modeling the air as an ideal gas.
A steel rod of radius 0.01 m and length 2. M is pulled on with a tensile force of 200,000 N, and the bar stretches to a length of 2.08 m. The radius of the bar is reduced to 0.0099 m. Determine the stress, strain, Young's modulus (E), and Poisson's r..
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