positive-displacement compressor

positive-displacement compressor

[′päz·əd·iv dis¦plās·mənt kəm‚pres·ər]
(mechanical engineering)
A compressor that confines successive volumes of fluid within a closed space in which the pressure of the fluid is increased as the volume of the closed space is decreased.
References in periodicals archive ?
Reciprocating - is a positive-displacement compressor that uses pistons driven by a crankshaft to deliver gases at high pressure.
The main contribution of this work is the simultaneous optimization of chiller and distribution system operation over a wide range of lift and capacity fraction using a new semi-empirical positive-displacement compressor model and first-principles models of most of the other components.
This is especially true for centrifugal compressors, where minimum capacity may be only 40% to 50% of the design heating load, before the refrigerant flow may become unstable; this is known as "surge." Surge is not an issue for positive-displacement compressors; therefore, single-compressor screw heat pumps are able to unload to a minimum capacity of 25% to 35% of the design heating load.
Using positive-displacement compressors, PLD transferred the LPG from the idled 8-in.

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