What is the temperature at which latent heat of water is zero?
Similarly, while ice melts, it remains at 0 °C (32 °F), and the liquid water that is formed with the latent heat of fusion is also at 0 °C.
How do you find heat of vaporization with temperature and pressure?
If the problem provides the two pressure and two temperature values, use the equation ln(P1/P2)=(Hvap/R)(T1-T2/T1xT2), where P1 and P2 are the pressure values; Hvap is the molar heat of vaporization; R is the gas constant; and T1 and T2 are the temperature values.
Which has the highest heat of vaporization?
water
Does heat of vaporization change with pressure?
Increasing the pressure has the overall the effect of reducing the enthalpy of vaporization, until it becomes zero at the critical point. At this stage, there is no longer a phase change associated with vaporization. Let be simple. Latent heat refers to the heat required to overcome molecular bonds.
How do you calculate latent heat from a steam table?
vf = Specific volume of saturated water (liquid). vg = Specific volume of saturated steam (gas). hf = Specific enthalpy of saturated water (energy required to heat water from 0°C (32°F) to the boiling point) hfg = Latent heat of evaporation (energy required to transform saturated water into dry saturated steam)
What is specific heat of saturated steam?
At atmospheric pressure (0 bar g), water boils at 100 °C, and 419 kJ of energy are required to heat 1 kg of water from 0 °C to its saturation temperature of 100 °C. Therefore the specific enthalpy of water at 0 bar g and 100 °C is 419 kJ/kg, as shown in the steam tables (see Table 2.2. 2).
What is the difference between superheated and saturated steam?
Saturated steam is steam that is in equilibrium with heated water at the same pressure, i.e., it has not been heated above the boiling point for its pressure. This is in contrast to superheated steam, in which the steam (vapor) has been separated from the water droplets then additional heat has been added.
What is meant by super saturated steam?
Pressure-Temperature Relationship of Water & Steam Saturated (dry) steam results when water is heated to the boiling point (sensible heating) and then vaporized with additional heat (latent heating). If this steam is then further heated above the saturation point, it becomes superheated steam (sensible heating).
Why superheated steam is used in turbine?
Another very important reason for using superheated steam in turbines is to improve thermal efficiency. The Carnot cycle, where the change in temperature of the steam between the inlet and outlet is compared to the inlet temperature.
Is Steam always superheated?
Once the water is heated to boiling point, it is vaporized and turned into saturated steam. When saturated steam is heated above boiling point, dry steam is created and all traces of moisture are erased. This is called superheated steam.