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A refrigeration cycle has a coefficient of performance equal to 75% of the value for a reversible refrigeration cycle operating between cold and hot reservoirs at 258C and 408C, respectively. For operation at steady state, determine the net power input, in kW per kW of cooling, required by (a) the actual refrigeration cycle and (b) the reversible refrigeration cycle. Compare values.
a household refrigerator that has a power input of 80w assume constant work input over time and a coefficient of
a four cylinder 2.4 liter engine operates on a four stroke cycle at 3200 rpm. the compression ratio is 9.41 the
Compute the theoretical density of CaF2, which has the fluorite structure. Ionic radii of Ca2+ and F- are 0.100 nm and 0.133 nm respectively.
12 lbm of superheated water vapor at 60psia and 500deg c in a piston cylinder device is cooled at constant pressure
a horizontal beam ab with cross-sectional dimensions b 0.75 in x h 8.0 in. is supported by an inclined strut cd and
water is heated in an insulated chamber by combining it with steam. the water enters at a steady rate of 100 kgmin at
determine the allowable current in a 10 gage 2.59 mm diameter copper wire that is insulated with a 1 cm - o.d. layer of
the load is supported by the four 304 stainless steel wires that are connected to the rigid members ab and dc.
a adiabatic r-134a compressor has an inlet state of 100 kpa -10 degc and an exit state of 60 degc 600 kpa. the dead
Using the ideal gas model with specific heat ratio, k = 1.4, and ignoring potential energy effects, determine (a) the exit velocity, in m/s, and (b) the rate of heat transfer, in kJ per kg of gas flowing through the nozzle.
a tank open to the atmosphere initially contains 2 lb of liquid water initially at 80degf and 0.4 lb of ice initially
this problem is problem 3.73 of the 8th edtion of this book. there are solutions from a previous version floating
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