Humidity in cellar, bath, etc.

Hi Timur:

Here is an idea which would even make a good app for android od iphone.

I bought a device supposed to give me instructions on when to open the window but its algotihm is not correct. I can sent you some pictures of its display.

It gives me for inside and outside: temp + rel humidity, and shows a sign when I am supposed to open the window.

As the sign did not show when I felt it should I used a Mollier Diagram to decide myself on the difference of absolute humidities, neglecting baomatric pressure and sea level differences. Also, it did not consider how long I should open which certainly if important when the temperature difference is imporrtant as for example in very hot or cold climate.

There also is an app which has a wrong algorithm but a good idea: it is based on the humidity level provided by a weather server. Its alofithm seems to be: if dew point outside is lower than dew point iside you should open the window.

My intuitive conviction (which gave could results) is that: If abs hum outside is lower than inside I can open the window.

This leads me to my propoal of a new calculator which basically is two of your 2162 calculators side by side, the result being: "open thhe window" of "don't open the window".

This would be it!

Additional enhancements could be numerous, as for example:

• indication of potential mildew, and a indicator ot the its degree of the exposure
• humidity level vs. confort zone (provided by the device I bought)
• correction of situation vs. sea level
• correction ot the current atmospheric pressure
• using rel hum from a weather server

Please let me know what you think about this.

Thanks & Regards,

Hans Daniel