A Dictionary of Applied Physics, Vol. 1 of 5: Mechanics, Engineering, Heat (Classic Reprint) - Tapa dura

Sinopsis

Excerpt from A Dictionary of Applied Physics, Vol. 1 of 5: Mechanics, Engineering, Heat

The efficiency. - Several kinds of efficiencies are recognised as applicable to pumps and blowers; of these the mechanical efficiency, or the ratio of the useful work done to the total work expended, is alone applicable to all types. Both terms of the ratio need further definition to rid them of ambiguity. The work expended is usually taken to mean either (a) the work expended on the gas in giving to it energy, com pressive, kinetic, or thermal, or (b) the work supplied to the mechanism of which the pump consists, including that lost in friction of solid or liquid parts. The efficiency reckoned with (a) is often termed the gas efficiency; that reckoned with (b) the over-all efficiency.

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