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Reconsider Prob. 11-32. Using EES (or other) software, investigate the effect of varying the compressor isentropic efficiency over the range 60 to 100 percent. Plot the power input to the compressor and the electric power saved by using a heat pump rather than electric resistance heating as functions of compressor efficiency, and discuss the results.
Prob. 11-32
A heat pump using refrigerant-134a heats a house by using underground water at 8°C as the heat source. The house is losing heat at a rate of 60,000kJ/h. The refrigerant enters the compressor at 280 kPa and 0°C, and it leaves at 1 MPa and 60°C. The refrigerant exits the condenser at 30°C. Determine (a) the power input to the heat pump, (b) the rate of heat absorption from the water, and (c) the increase in electric power input if an electric resistance heater is used instead of a heat pump.
Divide the sodium hydroxidecharge into 10 smaller charges, and add them one at a time, makingsure that each is well mixed and the tank temperature has stoppedincreasing before adding the next charge.
The dimensionless henry's constant for TCE at 25 degrees celsius is 0.4. A sealed glass vial is prepared that has an air volum of 4mL overlying an aquesous volume of 36mL.
The end of a 0.75-in-diameter rod is fixed to an immovable plate. The length of the rod is 18.0 in. A 50-lb weight is attached to a 16.0-in lever at the end of the Rod so that the weight is hanging perpendicular to the longitudinal axis of the rod..
Two waters are in equilibrium with air, one at pH 9.5 and one at pH 7.3. these waters are mixed in 1:1 proportions. Assuming that carbonate species dominate the acid/base behavior of boh solutions and that no gas transfer occurs when they are mixed
If the concentration of glucose in plasma is 5 mM, and theintracellular glucose concentration is negligible (i.e. 0 mM), whatis the rate of glucose diffusion (J) into the cell? Assume that thethickness of the plasma membrane is 10 nm.
a vertical curve is formed when a rural highway passes under a bridge joining a -8 grade to the horizontal grade
Refrigerant R134a enters the compressor of a refrigerator at 0.14 MPa and -10°C at a rate of 0.12 kg/s and leaves it at 0.7 MPa and 50°C. The refrigerant is cooled in the condenser to 24°C and .065 MPa and it is throttled to 0.15 MPa.
Determine the factor of safety for a 9 foot long hollow steel column 3.5 inches on a side that has a wall thickness of 0.225 inches and is loaded with a 22 kip load.
A vehicle is traveling on a curved section of a road of radius 2500 feet at a speed of 60 mi/h. The motorist suddenly applies their brakes, causing the automobile to slow down at a constant rate. After 8 seconds the speed has been reduced to 45 mi..
Problem Statement: A rectangular beam having b = 10 in. and d = 17.5 in. spans 15 ft face to face of simple supports. It is reinforced for flexure with three
The wind reaches a speed of 27.8 m/s in a storm. calculate the force acting on a 1m x 2m window facing the storm. the window is in a high-rise building. the air density p= 1.2 kg/m3.
A 2,400 foot long, 2 foot diameter pipline conveys water from ahilltop reservoir to an industrial site. The pipe is made of ductile iron, has an outside diameter of of 2.25 feet, and has expansion joints.
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