How do you find the enthalpy of a steam table?

T = Saturation point of steam/water (boiling point) 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)

What is the enthalpy of steam?

For saturated steam at standard atmosphere – 2) – the specific enthalpy – hg – is 2676 kJ/kg.

What is the temperature of 15 psig steam?

Saturated Steam Temperatures

Pressure Temperature Temperature
(p.s.i) (°F) (°C)
15 249.8 121.0
20 258.8 126.0
22 261.2 127.3

Are steam tables in absolute pressure?

Steam tables based on gauge pressure indicate atmospheric pressure as 0, while steam tables based on absolute pressure indicate it as 101.3 kPa (14.7 psi). Also, to distinguish gauge pressure from absolute pressure, a “g” is typically added to the end of the pressure unit, for example kPaG or psig.

How do you calculate the enthalpy of superheated steam?

The excess energy = 2 741.7 – 2 706.7 = 35 kJ/kg, and this is used to raise the temperature of the steam from the saturation temperature of 120 °C to 136 °C. The degree of superheat can be determined either by using superheated steam tables, or by using a Mollier chart.

What is enthalpy unit?

Enthalpy is an energy-like property or state function—it has the dimensions of energy (and is thus measured in units of joules or ergs), and its value is determined entirely by the temperature, pressure, and composition of the system and not by its history.

What temperature is high pressure steam?

High pressure steam boiler characteristics: Temperatures will exceed 250 degrees F up to 1200 degrees F. May include a superheater to heat steam above saturation temperature.

At what temperature is steam superheated?

100 °C
Superheated steam, water vapour at a temperature higher than the boiling point of water at a particular pressure. For example, at normal atmospheric pressure, superheated steam has a temperature above 100 °C (212 °F).

What information can be found in the steam tables?

There are six areas on the table that you should be aware of. These are pressure, temperature, sensible heat, latent heat, total heat and volume, remember these key areas and you’ll be reading steam tables in no time.

What do steam tables show?

It’s typically used to determine saturated steam temperature from steam pressure, or the opposite: pressure from saturated steam temperature. In addition to pressure and temperature, these tables usually include other related values such as specific enthalpy (h) and specific volume (v).

How to calculate the enthalpy of saturated steam?

At standard atmosphere – 1 bar (14.7 psi) – water starts boiling at 100 oC (212 oF). The specific enthalpy of water (in SI units) can be calculated from: Specific enthalpy of saturated steam – hg – can be obtained from tables as above. The value depends on the pressure.

How is the strength of the lattice enthalpy determined?

Lattice enthalpy is a measure of the strength of the forces between the ions in an ionic solid. The greater the lattice enthalpy, the stronger the forces. Those forces are only completely broken when the ions are present as gaseous ions, scattered so far apart that there is negligible attraction between them.

What are the properties of a saturated steam table?

Properties of Saturated Steam – Pressure in Bar – Saturated Steam Table with properties like boiling point, specific volume, density, specific enthalpy, specific heat and latent heat of vaporization.

Which is the correct enthalpy for steam entropy?

Specific Enthalpy 1 s is the steam entropy 2 suffix – f – referrer to saturated liquid 3 suffix – g – referrer to saturated vapor – steam