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1. Refrigerant 134a enters the compressor of an ideal vapor-compression refrigeration cycle as saturated vapor at 2108F. The condenser pressure is 160 lbf/in.2 The mass flow rate of refrigerant is 6 lb/min. Plot the coefficient of performance and the refrigerating capacity, in tons, versus the condenser exit temperature ranging from the saturation temperature at 160 lbf/in.2 to 908F.
2. To determine the effect of changing the evaporator temperature on the performance of an ideal vapor- compression refrigeration cycle, plot the coefficient of performance and the refrigerating capacity, in tons, for the cycle in Problem 10.11 for saturated vapor entering the compressor at temperatures ranging from 240 to 2108C. All other conditions are the same as in Problem 1.
an adiabatic steam turbine operates at steady state with inlet conditions p1500 kpa t1360 c steam leaves the turbine at
1. a go-kart including driver weighs 800 lbs. during an aggressive braking event the vehicle decelerates from 60
If the engine exerts a traction force of 1/8 of the weight of the train, determine the speed of the train when it has traveled up the slope a distance of 1.1 . Neglect rolling resistance.
according to test data a new type of engine takes in streams of water at 400 degrees f 40 psia and 200 degrees f 40
a piston-cylinder device contains 0.85 kg of refrigerant-134a at -10 degree celsius. the piston that is free to move
1. A six-pole, three-phase, 440-V, 60-Hz induction motor has the following model impedances: RS = 0.8 Q XS = 0.7 Q RR = 0.3 Q XR = 0.7 Q Xm = 35 Q Calculate the input current and power factor of the motor for a speed of 1,200 r/min.
Find the new angular speed of the student. Calculate the kinetic energy of the system before the student pulls his arms inwards.
What is the rate of heat transfer to the coolant, and what is the rate at which steam is condensed at the surface?
A Rankine cycle power plant is being developed to operate an irrigation system. In this power plant solar energy will be used to boil a low boiling point fluid within glazed flat plate solar collectors. The working fluid that has been selected is the..
The area under an engineering stress-strain curve up to fracture is the en- ergy/volume. The area under a true stress-strain curve up to fracture is also the energy/volume. If the specimen necks, these two areas are not equal.
a vertical piston-cylinder device initially contains 0.25 m3 of air at 600 kpa and 300degc. a valve connected to the
the acceleration of a particle is given by a -ks2 where a is in meters per second squared k is a constant and s is in
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