eml 3100 lec 5 - Thermodynamics Determining the phase of a...

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Lecture No. 5 1 UNIVERSITY OF FLORIDA Thermodynamics Determining the phase of a pure substance: Given T and P Go to saturated property table with saturated pressures. Look at the saturation temperature coinciding with the given pressure. If the temperature is less, than you have a subcooled liquid. For future reference, the enthalpy of the subcooled liquid is approximately equal to h f for saturated liquid at the given temperature. If the temperature is greater than you have a superheated vapor and you need to go to superheated tables to get other properties.
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Lecture No. 5 2 UNIVERSITY OF FLORIDA Thermodynamics Given T and v: Go the saturation tables for saturated temperatures. Note the value of v f and v g . If your value is between vf and vg for the given temp., then you are in the two-phase region. If your value is less than v f , then you are subcooled liquid. If your value is greater than v g , then you are superheated. See Example 3.1 in your text.
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3 UNIVERSITY OF FLORIDA Thermodynamics Quality A term used to describe the relationship between vapor and liquid in a two phase mixture of a pure substance The term considers that having more vapor than liquid represents a higher quality mixture. Generally in using steam to drive a turbine, the higher quality steam has more energy and is what you want to drive the turbine. • Quality = x = m
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eml 3100 lec 5 - Thermodynamics Determining the phase of a...

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