- 2068 Magh · 4 marks
Define saturation temp, subcooled liquid, degree of superheat, moisture
Short answer
Saturation temperature: boiling/condensation temperature at a given pressure. Subcooled liquid: liquid below its saturation temperature. Degree of superheat: T − T_sat for a superheated vapour. Moisture content: mass fraction of liquid in a mixture, equal to 1 − x.
Define the following terms: Saturation temperature, Subcooled liquid, Degree of superheat, and Moisture content.
- Saturation temperature: the temperature at which a pure substance starts to boil (or condense) at a given pressure; for water at 101.3 kPa it is 100 °C.
- Sub-cooled (compressed) liquid: liquid at a temperature lower than the saturation temperature at its pressure (or at a pressure higher than saturation pressure at its temperature).
- Degree of superheat: the excess of the temperature of a superheated vapour over the saturation temperature at the same pressure, T − T_sat. For example, steam at 1 MPa and 250 °C has superheat 250 − 179.9 = 70.1 °C.
- Moisture content: the mass fraction of liquid in a liquid-vapour mixture, = m_f/m = 1 − x, where x is the quality (dryness fraction).
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