Hello,

In the quest of a perfect dial VPD i try to create/implement a program in my climate computer.

The goal here, is to modulate the temperature in order to stay in the right set VPD.

*Note : Much easier/responsive in my set up to play with the temperature to control VPD rather than play with RH (Or try to play with both RH and Temperature)*

So we know, we have the following formula (in Celcius) :

VPD = 610.78 x e^(LeafTemp / (LeafTemp +238.3) x 17.2694)) - 610.78 x e^(AirTemp / (AirTemp +238.3) x 17.2694))*RH/100

Where LeafTemp = AirTemp - 2

And e=2,71828

Is there anybody who did extract Air temp from that equation?

With that we will be able **to calculate the desired Airtemp according to a setpoint VPD and RH **. It will look like :

AirTemp = f(VPD, RH)

Peete I think you did use this equation in your excell sheet? Will it be possible to get it? My math course are too far to solve this one in a decent amount of time:)