I have never tried that method of controlling humidity but seems like it could work. A quick read about using glycerol to control rh is a closed environment says it can work but may take some dialing in. Only way to find out is to try I suppose.
yes i will be glad to report the process and I will start in some days.
I think 62f and an rh of 55-65% should work well. What I don’t know is how fast the glycerol will pull humidity out of the cooler, so that is where the dialing in will have to be done. If it pulls it out too fast your dry time may be very short, like in a compressor fridge. If you can accurately control it then you can just bring it slowly down same a with a dehumidifier. You don’t need to hang dry first IF the glycerol takes out enough humidity. When using the dehumidifier in the first few days it takes out a couple cups of water. I'm not sure how that will effect the glycerol.yes i will be glad to report the process and I will start in some days.
I tested the setup with a bunch of oregano leaves and with the aquarium-airpump it was quite easy to hit the humidity numbers. However as you see i added a second cpu-ventilator in order to have no humidity gradient. What I fear is mold...
So therefore I don't want to setup a super slow ramp..
Would you say 16-17°C (62F) is cold enough and then humidity may 55-65 or 55-60? I want to have a decent drying phase. Would you still dry for 24 in the tent? I would like to avoid that since I would pre-harvest some flowers earlier then others so my tent is then blocked for this period of time.
What is your recommendation for the racks, would you just place the buds on the existings once or adding something ontop like silicon mats or whatever? Or your metal once? Sorry I'm from germany, missing some words here and there
Thanks alot for your support buddy, I will give it back with a nice report to show may an alternative to the dehumidifier setups
I’m going to try and answer a few of your questions.
Thank you @Hook Daddy! Did you see my other question? In my dehumidifier (looked like yours but a different brand.. already had it) There was an extra board with two wires that connected to a resister. I'm thinking it was used to turn the light on that showed it was actually dehumidifying. I pulled the resister and wires to break it down like you did. It seems to be working. I'm hoping I didn't remove some safety feature like a cutoff when its overheating. Thoughts?
I don’t think it had any overheating safety feature, if it is working you should be fine. It was probably to light the led like you said.
Awesome. Then I should be able to complete the build today when the fridge arrives and start my baking soda and test runs before I harvest in a week or two. Thanks again! This is gonna be sweet!
Yes, it did read like that Hook, but glad you clarified. I also am not using your method of constantly changing humidity setpoints. I am using a ac infinity pro, and set my vpd to .8kpa, and let the controller do what the controller does automatically, and so far so good. I am on day 5 of dry, and using a moisture meter. I am at about 15, with 10 to 12 being my goal before bagging.
The point of changing humidity setpoints is to let it do a slow dry over force drying. But if it works for you, none of this is set in stone.
Yes it works, and I am not sure what you mean by forced dry, it is doing the same thing you are doing with the relative humidity manually. It adjusts, based off the environment.This is what the Cannatrol does only it uses dew point. Here is the info I used of a scientific study which I believe the Cannatrol is based off of.
Sure if it works for you.
How many days do you think your setup will take to get down to 62rh from initial chop and load? Just curious. I like the setup but I'm going for a slow dry and not sure the vdp approach will work for me.
Its not about getting to 62percent rh. RH relative humidity is just that relative. Its about moisture activity level. The drying process is simply that to get your plant down to were there is no moisture activity on the exterior. The cure is about doing the same thing to the internal moisture activity level. Vpd is the more accurate calculation of the effect of humidity and temp, nothing more or nothing less.And is calculated using the same variables (Temp and Humidity) People keep mentioning a slow dry, that really should not be the goal in and of itself. Because too slow of a dry opens you up to bud rot. There is an optimum, insert what you will(vpd,dew point, temp and humidity,etc), that will allow your plant to reach this moisture activity level in x amount of time. The x amount of time is what is really important. The science says around 8 to 10 days(, depending your personal environment. A moisture meter is invaluable, as this is what is most important. These wine coolers we are using are affected by your room temp and humidity. Look at the screen shots I posted a couple comments up, this shows what the science says about this subject. That was taken from you tube video by a scientist studying drying and curing, it is very informative.
I’m curious to know how VPD is more accurate than temp and humidity when they are calculated using temp and humidity as the variables. The equation is just better i guess. That’s like saying power is more accurate than voltage and current. Please at least try and get facts straight before posting.
Thanks for the yaml! Got the automation working yesterday and so far so good, seeing a beautiful gradual slope down in humidity similar to your chart. I've got the koolatron a little more than half full and it reduced from ~73% to 69% rh in the last 24 hours. The temp automation is effective in cycling the dehumidifier on and off with ~30 min cycles. In theory if we wanted to slow the slope we could set a tighter and/or lower temp range, only question is if the sensors are sensitive enough or update frequently enough for the automation to work with a tighter range.
