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Thermodynamics Notes7

# Thermodynamics Notes7 - ME 311 FALL 2007 CHAPTER...

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ME 311 THERMODYNAMICS S. Masutani FALL 2007 CHAPTER 3 (continued) Thermodynamic Property Data, p-v-T Relationship for Gases Learn to use tables of thermodynamic properties. 1. Steam tables (power systems)/refrigerant tables 2. Gas tables – propulsion systems (engines/missiles/etc.) Vapor and Liquid Tables Superheated vapor—starts from saturated vapor state Compressed liquid—ends at saturated liquid state Many of the property data tables are prepared so that linear interpolation can be used with acceptable accuracy Saturation Tables List corresponding saturated p or T Shows properties of saturated liquid and vapor states Subscripts f (liquid); g (vapor) Also include change in properties going from liquid to vapor; e.g., u fg . v fg , h fg Recall that p and T are not independent variables in the two-phase regime Quality : χ mass vapor/mass total General relationship for intensive thermodynamic properties: fg f f g f g f mixture g f χξ ξ ξ ξ χ ξ χξ ξ χ ξ ξ ξ + = + = + = ) ( ) 1 ( : , where ξ can be v, h, s, or u (for SCS). The property h is the specific enthalpy , which is defined as: h u + pv also H U + pV Enthalpy is useful in analysis of control volumes (open systems) where mass flows through the region selected for study.

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Thermodynamics Notes7 - ME 311 FALL 2007 CHAPTER...

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