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A two-stage cascade refrigeration system is to provide cooling at -40oC while operating the high-temperature condenser at 1.6 MPa. Each stage operates on the ideal vapor-compression refrigeration cycle. The upper vapor compression refrigeration system (VCRS) uses water as its working fluid and operates its condenser at 400 kPa. This system produces a cooling effect of 20 kJ/s. Determine the mass flow rate of R-134a and water in their respective cycles, and the overall COP of this cascaded system.
burning one metric ton 1 000 kg of coal can yield an energy of 3.30x1010j. fission of one nucleus of uranium235 yields
air is heated at steady state as it flows through a constant area duct. at the inlet the pressure is 2.8 bar the
the uniform 100-kg beam is freely hinged about its upper end a and is initially at rest in the vertical position with
1. with reference to basic constructional features contrast the methods of compression employed by positive
A block and tackle system with nine supporting strands is used to lift a metal lathe in a manufacturing plant. The motor being used to wind the cable in the pulley system can provide 100 lb. of force.
a steam turbine receives water at 15 mpa 600oc at a rate of 100 kgs shown in figure q4 below. in the middle section 20
3 rigid tank initially contains refrigerant-134a at 14oc. at this state 70 of the mass is in the vapour phase and the
find the cartesian components of force p acting in the x y and z directions given p20n alpha 134.5 deg beta 55.0 deg
on a hot summer day a student turns his fan on when he leaves his room in the morning. when he returns in the evening
In an ore minig operation, a bucket full of ore is suspended from a traveling crane which moves slowly along a stationary bridge. The bucket is to swing no more than 4m horizontally when the crane is brought to a sudden stop. Determine the maximum..
a heat engine is composed of of a monatomic ideal gas which runs in the following cycle at point a the pressure is 2.6
a package is dropped from the plane which is flying with a constant horizontal velocity of va 160 fts at a height h
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