lec3 - Chapter 3 Evaluating Properties Lava flowing into...

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1 Chapter 3: Evaluating Properties Property Relations in Engineering Thermodynamics Lava flowing into the Pacific Ocean in Hawai . Photo courtesy of Mike Benson. Objectives 1. How to define the state of a system. 2. How many properties are needed to define the state of a system? 3. What happens when phase changes occur, or when the system is composed of more than one phase? 4. How to retrieve values for the properties ?
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2 Definitions • Simple system: a system is referred to as simple system if there is only one way the system energy can be significantly altered by work as the system undergoes quasiequilibrium processes. • Simple compressible system: simple system where the energy change by work is associated with volume change. The State principle The number of independent properties is one plus the number of relevant work interactions.
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3 The State Principle Two independent, intensive, thermodynamic properties are required to fix the state of a simple compressible system. For example: P and v T and u x and h Intensive thermodynamic properties: Less used: g - Gibbs free energy a - Helmholz free energy v – specific volume T – absolute temperature P –absolute pressure s –specific entropy x – quality (steam only) u – specific internal energy h – specific enthalpy P-v-T Relation Note the location of the following: - Single phase regions - Two phase regions - Saturation states - Triple line - Critical Point
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4 T-v diagram Diagram courtesy of Jerry M. Seitzman, 2001.
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lec3 - Chapter 3 Evaluating Properties Lava flowing into...

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