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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.
During an engine test on the ground, a propeller thrust T = 4000 N is generated on the 1500 kg airplane with mass center at G. The main wheels at B are locked and do not skid; the small tail wheel at A has no brake.
what are the factors affecting the hydraulic conductivity?
Which emits more SOx per unit amount of electricity produced: a coal-fired plant with a 90% efficient SO2 scrubber or an oil-fired plant with no scrubber? Assume the coal has a heat content of 13,000 Btu/lb and contains 3.5% sulfur, and that the oil ..
The interior height of the cone is 3.60 in. The cone has an exterior radius of 1.25 in and an interior radius of 1.10 in. The scoop of ice cream sits on the cone's interior radius and extends into the cone some distance.
A beam is simply supported at the ends and is continuous over two spans. The left-hand span is 16 ft and the right-hand span is 20 ft. The beam supports a uniform load of 900 plf, which includes its own weight,
a lagoon is 20 ft by 80 ft with a depth of 5.5 ft .Wastewater from households flow into the lagoon at 260 gal/day .How many days would it take to fill the lagoon
Assuming that the velocity variation within the main channel and the floodplain subsections is much smaller than the change in mean velocities between subsections, find the value of the kinetic energy correction coefficient.
The saturation concentration for the drop is 9.20 mg/L. If, after falling for two seconds, the droplet has an oxygen concentration of 3.20 mg/L, how long must the droplet fall (from the start of the fall) to achieve a concentration of 8.20 mg/L
In 1908, H. Chick reported an experiment in which he disinfected anthrax spores with a 5% solution of phenol. The results of his experiment are tabulated below. Assuming the experiment was conducted in a completely-mixed batch reactor, determine the ..
A hollow magnesium shaft is rigidly bonded to a solid steel shaft and rigidly mounted between two supports. A torque of 500 NA·m is applied at the junction between the two shafts. What is the maximum shear stress in the magnesium?
State the full name of the section of SOLAS that sets out the minimum standards for the training and competence of crew members and describe how the surveyor would go about checking that a vessel had the necessary number of qualified staff.
how many pounds of coal must be burned to keep one 100 watt light bulb lit for one hour. Assume efficiency of the power plant is 35%, the transmission losses are 10% fo the delivered poer, and the heating value of coal is 12,000 BTU/lb
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