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A 75-hp (shaft output) motor that has an efficiency of 91.0 percent is worn out and is to be replaced by a high efficiency motor that has an efficiency of 95.4 percent. The motor operates 4368 hours a year at a load factor of 0.75. Taking the cost of electricity to be $0.08/kWh, determine the amount of energy and money saved as a result of installing the high-efficiency motor instead of the standard motor. Also, determine the simple payback period if the purchase prices of the standard and high-efficiency motors are $5449 and $5520, respectively.
a piston-cylinder contains 1 lbm of a saturated ammonia at 70 degrees farenhight and 85 quality. the ammonia is then
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Air at 5 bar and 177°C (State 1) is expanded through a turbine to 1 bar and 27°C (State 2). The mass flow rate of air through the turbine is 2 kg/s. Stray heat loss of 53.22 kW occurs to a surrounding at 27°C. Calculate the power (kW) developed by th..
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Tall buildings can develop a significant difference in pressure between the inside and the outside of the building. Air lock entrances are used at the ground level so the pressure at the ground floor is not the same as atmospheric pressure. Assume th..
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consider the turbocharger of an internal combustion engine. the exhaust gases enter the turbine at 450 c at a rate of
cara starts from rest at t 0 and travels along a straight road with a constant acceleration of 6 fts2 until it reaches
what kind of metals are often recommended for use at low temperatures particularly when any sudden loading of the part
water is used in a regenerative power cycle where the standard rankine cycle is augmented with one closed feed water
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