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By Kenneth C. Weston

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9 Efficiencies Efficiency is a measure of the quality of an operation or of a characteristic of a device. Several types of efficiencies are widely used. It is important to clearly distinguish among them. Note that the terms work and power are equally applicable here. 5(a). Thus a gearbox for converting rotational motion from a power source to a device driven at another speed dissipates some mechanical energy by fluid and/or dry friction, with a consequent loss in power transmitted to the second machine.

4) and Pump Power = mswp = ms(h3 – h4) [Btu/hr | kW] where the negative values resulting from the fact that h4 > h3 are in accordance with the thermodynamic sign convention, which indicates that work and power must be supplied to operate the pump. The net power delivered by the Rankine cycle is the difference between the turbine power and the magnitude of the pump power. One of the significant advantages of the Rankine cycle is that the pump power is usually quite small compared with the turbine power.

27 Air enters a wind tunnel nozzle at 160/F, 10 atm, and a velocity of 50 ft/s. The entrance area is 5ft2. 5 atm and 675 ft/s, what are the exit temperature and area? 28 Air enters a wind tunnel nozzle at 90°C, 250 kPa, and a velocity of 40 m/s. The entrance area is 3 m2. If the heat loss per unit mass is 7 kJ/kg and the exit pressure and velocity are, respectively, 105 kPa and 250 m/s, what are the exit temperature and area? 29 Air enters a wind tunnel nozzle at 160/F, 10 atm, and a velocity of 50 ft/s.

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Energy Conversion Weston by Kenneth C. Weston


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