The facts and we the theory.
The theory
We can say that VPD is the indicator of how much transpiration will happen in a plant.
If we maintain a steady VPD (ex: 1,4), the rate of evapotranspiration of our plants should stay the same (all other things being equal)
The fact
Evapotranspiration is empiric and can actually be measure by the difference between the level of water added in a room and the level of water collected through dehumidificator and run off.
Is anybody have study/data about the real numbers? Is the evapotranspiration is really the same with a VPD=1,5 at 21c and a VPD=1,5 at 28c?
Possibles consequences
When it s time to size the HVAC for big places, it s much more easy to deal with dehumidification at 28c than 21c. The savings on the HVAC equipment can be quite significant.
If anybody have a clue about the question it will be very appreciated :
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Is the evapotranspiration is really the same with a VPD=1,5 at 21c and a VPD=1,5 at 28c?
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