There is a new water purification system with small modular units, that claims that it uses the most natural way to purify water, without polluting the environment.
It gathers (any) water and it heats it with the help of some solar panels.
As it heats, it begins to evaporate and the resulting vapor rises to the top of the section, leaving any contaminants behind. Then the vapor becomes liquid again, and here is the fresh clean water everyone wants!

All that vapor made me search for Vapor pressure and Flow rate in the fxSolver database.
Today we will discuss flow rate, leaving Vapor pressure for the next time.

The structure which provides ventilation for hot flue gases or smoke from a boiler, stove, furnace or fireplace to the outside atmosphere causes a flow rate. The height that structure (e.g. chimney) influences its ability to transfer flue gases to the external environment via stack effect.
The higher pressure outside the chimney is the driving force that moves the required combustion air into the combustion zone and also moves the flue gas up and out of the chimney. That movement or flow of combustion air and flue gas is called “natural draught/draft”.

The equations for the draft flow rate (Q) is the one on the left. Where C is discharge coefficient (usually taken to be from 0.65 to 0.70) and it is dimensionless, A is the Cross-sectional area of chimney (m²), g the standard gravity, H the Height of the chimney (m), Ti the average temperature inside the chimney (K) and Te the external air temperature (K).

Go ahead, check this equation and search whatever else you want to solve. You will find some help in our fxSolver video.
Also remember to follow or interact with us in our social media pages. You will find links below.