1.B] Define the following terms with respect to steam:
- Saturation temperature
- Latent heat of vaporisation
- Quality of the steam
- Sensible heat
- Degree of superheat
Answer:
1. Saturation temperature: The saturation temperature is the temperature for a corresponding saturation pressure at which a liquid boils into its vapor phase. The liquid can be said to be saturated with thermal energy. Any addition of thermal energy results in a phase transition.
2.Latent heat of vaporisation: Latent heat of vaporization is a physical property of a substance. It is defined as the heat required to change one mole of liquid at its boiling point under standard atmospheric pressure. It is expressed as kg/mol or kJ/kg.
3.Quality of the steam: Steam quality is the proportion of saturated steam (vapor) in a saturated condensate (liquid)/ steam (vapor) mixture. A steam quality of 0 indicates 100 % liquid, (condensate) while a steam quality of 100 indicates 100 % steam.
4.Sensible heat: Sensible Heat, it is the quantity of heat contained in 1 kg of water according to the selected temperature.
5.Degree of superheat: the degree of superheat can be defined as the amount by which the temperature of a superheat vapour/steam exceed the temperature of the saturated vapour/steam at the same pressure.