What is the enthalpy of steam?
For saturated steam at standard atmosphere – 2) – the specific enthalpy – hg – is 2676 kJ/kg.
What is the CP value of steam?
Steam Cp=1.8723 kJ/kg. K Cv=1.4108 kJ/kg.
What is the critical of steam?
Steam Generators The critical pressure and critical temperature of water and steam are 22.12 MPa and 647.14 K, respectively. Any boiler that operates below the critical point is called a subcritical boiler, and one that operates above the critical point is known as a supercritical boiler.
What is the enthalpy of condensation of steam?
Example – Heat released when Condensing Steam 5 kg of steam with atmospheric pressure, temperature 100 oC and evaporation enthalpy 2257 kJ/kg is condensated. The heat transfer can be calculated as. Q = (2257 kJ/kg) (5 kg) = 11285 kJ.
How do you calculate enthalpy of steam?
This Enthalpy for Saturated Steam can be obtained at atmospheric pressure from above Table, i.e., hg = 2676 KJ/Kg, So now Enthalpy required for saturated liquid to convert into saturated steam can be obtained as follows, Latent Heat ( he ) = hg – hf = 2676 – 419 = 2257 KJ / Kg.
How is steam calculated?
Step 2: Determine Feedwater Properties and Mass Flow
- Blowdown Mass Flow = Feedwater Mass Flow * Blowdown Rate.
- Steam Mass Flow = Feedwater Mass Flow – Blowdown Mass Flow.
- Steam Mass Flow = Feedwater Mass Flow – Feedwater Mass Flow * Blowdown Rate.
- Feedwater Mass Flow = Steam Mass Flow / [ 1 – Blowdown Rate ]
What is VF and VG in steam table?
vf = Specific volume of saturated water (liquid). vg = Specific volume of saturated steam (gas).
What is the mass of steam?
33.45 grams of steam.
What are critical and triple points for steam?
Critical point is where vapor and liquid are indistinguishable and triple point is where ice, water and vapor coexist in thermodynamic equilibrium.
What is triple point and critical point?
The triple point represents the combination of pressure and temperature that facilitates all phases of matter at equilibrium. The critical point terminates the liquid/gas phase line and relates to the critical pressure, the pressure above which a supercritical fluid forms.
How do you calculate condensation in steam?
This is determined by dividing the total heat removed by the system by the latent heat contained in the steam. The calculation is 30,000 / 794, which is 37.8 lb/hr of liquid condensate.
Why saturated steam is better than superheated steam?
Superheated steam has more energy and can work harder than saturated steam, but the heat content is much less useful. This is because superheated steam has the same heat transfer coefficient of air, making it an insulator and poor conductor of heat.
What is first ionisation enthalpy?
The energy required to remove the most loosely bound electrons from the isolated gaseous atom is called its first ionisation enthalpy and is denoted by Δ i H 1.
How does the ionization enthalpy change down the group?
On moving down the group, the atomic size increases gradually due to the addition of 1 new principal energy shell at succeeding element. As a result, the distance of the valence electron from the nucleus increases. The force of attraction by the nucleus for the valence electron decreases and hence the ionization enthalpy should decrease.
What are the factors that affect the I-ionization enthalpy?
Ionization enthalpy depends on the following factors: 1. Penetration Effect Penetration means the proximity of an electron in an orbital to the nucleus. For each shell and subshell, it can be observed as the relative density of electrons near the nucleus of an atom.
What is the symbol for specific enthalpy of vaporization?
STEAM TABLES Symbol Property Units h specific enthalpy kJ/kg P pressure bar = 0.1 MPa Pr Prandtl number (= ηC p /λ) dimensionless r specific enthalpy of vaporization kJ/kg