Enthalpy value calculation
Enthalpy value calculation
(OP)
how can i calculate enthalpy value tank inside. If i know vapor pressure of liquid tank inside. e.d:
tank volume : 18m3
Vapor pressure at 20ºC =9 bar
Pressure tank= vapor pressure
tank volume : 18m3
Vapor pressure at 20ºC =9 bar
Pressure tank= vapor pressure





RE: Enthalpy value calculation
R22's saturation v.p. at 20oC is 9.1 bar abs. This is no estimate, data were taken from published tables.
RE: Enthalpy value calculation
and the NPSHa = 0
This mean That :
absolute pressure = vapor pressure.
What is the pressure at the pump inlet ?
Pressure inlet= absolute pressure-Vapor pressure+ static head- pipe losses .
If NPsha =0
Pressure inlet= vapor pressure???
Could you help me ?
RE: Enthalpy value calculation
Since the NPSH expressed in m or ft of liquid, measured at the pump suction, is
a value of zero would mean that
When the second term is small in comparison with Pv, as it generally is, one may say that when NPSH=0, P=Pv.
where
P is the absolute suction pressure
Pv is the vapor pressure of the liquid at the pumped temperature
u is the velocity of the liquid at the section where measurements were taken
g is the acceleration of gravity.
Hasta pronto y buena suerte.
RE: Enthalpy value calculation
Raoult- Dalton laws?
RE: Enthalpy value calculation
RE: Enthalpy value calculation
But I don´t know what dose mean some of this.
Isothermic conditions:
The value of volume of differents phase , is lts of vapor or liquid per each mol of Propane at this pressure and temperature.
THis a good adress¡¡
sorry
Thank you
RE: Enthalpy value calculation
Please work with a local chemical or pump engineer to calculate what you need. You seem confused on the concepts of enthalpy, NPSH, and composition. At this rate I'm worried you will improperly apply these formulas and unknowingly proceed with the wrong value in purchasing equipment. Good luck.
RE: Enthalpy value calculation
RE: Enthalpy value calculation
wt% flashed = 100 x (Hl,p1-Hl,p2)/Hv,p2
where
Hl,p1 is the enthalpy of the liquid at pressure P1
Hl,p2 is the enthalpy of the liquid at pressure p2
Hv,p2 is the latent heat of vaporization at p2.