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Consider two reversible refrigerators operating in series. The first refrigerator removes heat at the rate of 250 kW from a space to be maintained at -23°C and rejects heat to an intermediate temperature reservoir. The second refrigerator removes the heat received by the intermediate temperature reservoir and rejects heat to the ambient reservoir at 27°C. Coefficient of performance of the second refrigerator is 80% of the first refrigerator.
(a) Determine the temperature (°C) of the intermediate reservoir.(b) Calculate the total power (kW) required to operate both the refrigerators.(c) What is the rate of heat transfer (kW) for the ambient reservoir?
In an air-water vapor mixture at 30°C, the partial pressure of the water vapor is 1.5kPa, and the partial pressure of the dry air is 100.5kPa. What is the relative humidity of the air-water vapor mixture?
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5 lbm of air is compressed in a piston cylinder assembly from 1 bar 300k to 5 bar according to a polytropic process
coast guard pararescue jumpers are trained to leap from helicopters into the sea to save boaters in distress. the
at 12 50000 bond is offered for sale at 45000. if the bond interest is payable monthly and the bond matures in 20 years
the true stress-strain curve of a material obeys the power-hardening law with n 0.18. a piece of this material was
Describe the four incorrect assumptions concerning robot - arm movement that are most frequently responsible for impact accidents.
a piston cylinder device contains 0.3kg of r134-a initially at 0 c and 400 kpa. the cylinder is then heated until the
consider the equation dydt y2y2-1 a- determine the equilibria and classify each one as asymptotically stable unstable
Consider the 2.0micrometer long GaAs device where the E-field is 5kV/cm and Mn*=.067M0. Calculate the transit time of an electron through the device if the mobility is 8000 cm^2V-s.
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