Physics Help Forum Evaporating Water with a Boiler Type Vessel

 Thermodynamics and Fluid Mechanics Thermodynamics and Fluid Mechanics Physics Help Forum

 Sep 4th 2019, 05:25 AM #1 Junior Member   Join Date: Sep 2019 Posts: 1 Evaporating Water with a Boiler Type Vessel I am attempting to evaporate water to the atmosphere with a boiler type vessel. Normal operating pressure of the vessel would be 5 psig. How much water could potentially be evaporated? Also, what issues come to mind with this concept?
 Sep 5th 2019, 04:06 AM #2 Senior Member     Join Date: Jun 2016 Location: England Posts: 998 If you are evaporating to Atmosphere, there is no limit to the amount of water that could be evaporated. However if you are limited to 5 psi over atmospheric, there will be a limit to how fast you can evaporate the water. The actual limit will depend on lots of details you have not supplied; The energy rate available from your source of heat The amount of Water, The size of your Boiler, The size of the Vent from your Boiler to Atmosphere, etc... __________________ ~\o/~
 Sep 6th 2019, 06:08 AM #3 Senior Member   Join Date: Oct 2017 Location: Glasgow Posts: 443 You can estimate the rate of evaporation using the equation for latent heat transfer: $\displaystyle \dot{m} = \frac{\dot{Q}}{h_{liq-vap}}$ where m is the evaporation rate (in kg/s), Q is the rated power output of your boiler (in W) and $\displaystyle h_{liq-vap}$ is the specific enthalpy of liquid-to-vapour phase change of water. At room temperature and pressure, $\displaystyle h_{liq-vap} = 2265$ kJ/kg, but it's actually a function of temperature and pressure, so it's probably a little bit lower than this. You should recalculate this constant at the boiling point of water at that pressure (which I think is about 108 deg. C at 134 kPa).

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