Suction pressure

Suction pressure

The term diffusion pressure deficit (DPD) was coined by B.S Meyer in 1938. Originally DPD was described as suction pressure by Renner(1915). It is reduction in the diffusion pressure of water in solution or cell over its pure state due to presence of solutes in it and forces opposing diffusion. Diffusion pressure of water is maximum and its theoretical value is 1236 atm. DPD of a solution is equal to its osmotic pressure i.e DPD = OP(of solution). DPD of a cell is influence by both osmotic pressure and wall pressure (turgor pressure) which opposes the endosmotic entry of water, i.e. DPD = OP - Wall presseure. DPD is directly proportional to the concentration of the solution. DPD decreases with dilution of solution. The actual pressure with which cell absorbs water is called "suction pressure". In refrigeration and air conditioning systems, the suction pressure' (also called the low-side pressure) is the intake pressure generated by the system compressor while operating. The suction pressure, along with the suction temperature and the wet bulb temperature of the discharge air are used to determine the correct refrigerant charge in a system.



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  • suction pressure — įsiurbimo slėgis statusas T sritis Standartizacija ir metrologija apibrėžtis Vandens slėgio poroje ir visuminio aplinkos slėgio skirtumas. atitikmenys: angl. suction pressure vok. Saugdruck, m rus. давление всасывания, n pranc. pression de… …   Penkiakalbis aiškinamasis metrologijos terminų žodynas

  • suction pressure — įsiurbimo slėgis statusas T sritis fizika atitikmenys: angl. suction pressure vok. Saugdruck, m rus. давление всасывания, n pranc. pression de succion, f …   Fizikos terminų žodynas

  • suction pressure — [1] Pressure in low pressure side of a refrigerating system. [2] Compressor inlet pressure. another name for low side pressure …   Dictionary of automotive terms

  • suction pressure — noun see suction force …   Useful english dictionary

  • suction pressure control valve — Device located in the suction line which maintains constant pressure in evaporator during running portion of cycle …   Dictionary of automotive terms

  • Suction — is the flow of a fluid into a partial vacuum, or region of low pressure. The pressure gradient between this region and the ambient pressure will propel matter toward the low pressure area. Suction is popularly thought of as an attractive effect,… …   Wikipedia

  • low-suction pressure — Condition of lower than normal high side pressure caused by system malfunction …   Dictionary of automotive terms

  • suction force — noun or suction pressure or suction tension : diffusion pressure deficit …   Useful english dictionary

  • Suction — Suc tion, n. [L. sugere, suctum, to suck; cf. OF. suction. See {Suck}, v. t.] The act or process of sucking; the act of drawing, as fluids, by exhausting the air. [1913 Webster] {Suction chamber}, the chamber of a pump into which the suction pipe …   The Collaborative International Dictionary of English

  • Suction chamber — Suction Suc tion, n. [L. sugere, suctum, to suck; cf. OF. suction. See {Suck}, v. t.] The act or process of sucking; the act of drawing, as fluids, by exhausting the air. [1913 Webster] {Suction chamber}, the chamber of a pump into which the… …   The Collaborative International Dictionary of English

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