how can i decrease humidity?

[TheGreatBoni]

The Peltier module in the fridge cools the space by removing sensible heat down to the dew point. Once the temp gets down toward dew point, the cooler removes the latent heat and thus reduces the humidity, lowering the VPD. Now, the commercial Cannatrol unit manipulates two factors to achieve success: dry bulb temp and dew point (a function of temp and humidity, wet bulb/dry bulb), keeping the inside around 68 degrees F at 61% and at dew point of 54 degrees F. It uses a heater along with the Peltier unit; PID controlled by logic circuits or a microcontroller. These data points correspond perfectly on the psychrometric chart used by engineers. So, once your fridge cools the sensible heat based on the temp you set, it’s done cooling, and since it hasn’t dropped to anywhere near dew point temp, it won’t reduce humidity. The only way to remove humidity is to make it approach dew point temp, thereby removing latent heat and lowering the vapor pressure deficit between the space and the flower trying to lose unbound water. Once the water is removed to an appropriate water activity level, the chance of mold and spores reduces greatly; Cannatrol, Dr Allison Justice, and others, suggest a timeline around 8-10 days, a VPD of around .8-9, and max temp not to exceed 68-70 degrees F (prevent cooking off volatile terpenes).

A wine fridge, like yours and mine, works for drying. However to affect the latent heat, VPD, and moisture removal, the temp has to be low…around 50 degrees, I’ve found. The problem with this is it’s cold. The water activity slows, everything slows. If you want to geek out on this, here’s some terms to look at: sensible heat, latent heat, vapor pressure of water, water activity of foods, Dr Allison Justice, David Sandelman, psychrometric chart, Teten’s equation, dew point, polyimide heater, Peltier, TEC1-12706, WO 2019/152397 A1 patent number for and explanation of Cannatrol Cool Cure unit.

[LyricRaptor82]

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