ENGPHYS 2NE3 Lecture 6: Enthalpy, Quality, and Water Properties

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Enthalpy: a combination property, extensive: h = u + pv ( kj, for a given pressure, the latent heat of vaporization is the enthalpy difference, this is the amount of energy required to vaporize one kg of substance. Intensive: h = u + pv (kj/kg: (cid:3033)(cid:3034)= (cid:3034) (cid:3033, ratio of mass vapor to total mass of mixture. Mass quality: (cid:1876)=(cid:3040)(cid:3291)(cid:3290)(cid:3040)(cid:3290, will = 0 if the substance is a saturated liquid, will = 1 if the substance is a saturated vapor. A 6l pressure vessel with 1. 15 kg of water at 150 degrees celsius. Find the pressure, the quality, the enthalpy of the water, and the volume by liquid phase. We know that this is a mixture: in between the specific volumes of saturated water and saturate vapor at this temperature. =(cid:888)(cid:1838),(cid:1865)=(cid:883). (cid:883)(cid:887),(cid:1874)=(cid:882). (cid:882)(cid:882)(cid:888)(cid:883). (cid:883)(cid:887)=(cid:882). (cid:882)(cid:882)(cid:887)(cid:884)(cid:883)(cid:1865)3(cid:1863)(cid:1859) (cid:1876)=(cid:4666)(cid:1874)(cid:3040) (cid:1874)(cid:3033)(cid:4667)/(cid:4666)(cid:1874)(cid:3034) (cid:1874)(cid:3033)(cid:4667) (cid:1876)=(cid:882). (cid:882)(cid:882)(cid:887)(cid:884)(cid:883) (cid:882). (cid:882)(cid:882)(cid:883)(cid:882)(cid:891)(cid:883) (cid:882). (cid:885)(cid:891)(cid:884)(cid:886)(cid:890) . (cid:882)(cid:882)(cid:883)(cid:882)(cid:891)(cid:883)=(cid:882). (cid:882)(cid:883)(cid:882)(cid:887)=(cid:883). (cid:882)(cid:887)% Can find this solution easily by plugging in the quality from above.

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