User Tag List

Informational! Informational!:  0
Likes Likes:  0
Page 2 of 4 FirstFirst 1234 LastLast
Results 9 to 16 of 32

Thread: Idea for a highland grow rack

  1. #9
    JMurphy97's Avatar
    Join Date
    May 2005
    Location
    Milwaukee
    Posts
    1,250
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I'm not seeing how it would blow the cooler air back in if it's going out the window. Don't they take out the hot air and move it out of the window, leaving in cooler air? I have two small ultrasonic humidifiers from wal-mart that were going to run at night. Is that going to be enough or would I need some high tech gadjets?

  2. #10
    Let's positive thinking! seedjar's Avatar
    Join Date
    Dec 2004
    Location
    Olympia, Washington
    Posts
    4,064
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    No, ACs work by recirculating air over a cooling element. A separate device (a compressor run by a motor) cools the element and generates waste heat as a result. The waste heat is the hot exhaust you feel from the back of an AC. No exchange of air is necessary, but many ACs include a fan to draw in fresh air.
    ~Joe
    o//~ Livin' like a bug ain't easy / My old clothes don't seem to fit me /
    I got little tiny bug feet / I don't really know what bugs eat /
    Don't want no one steppin' on me / Now I'm sympathizin' with fleas /
    Livin' like a bug ain't easy / Livin' like a bug ain't easy... o//~

  3. #11
    Tony Paroubek's Avatar
    Join Date
    Oct 2001
    Location
    Far Away NY
    Posts
    4,640
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    So are you saying to cool the room the grow chamber is in but don't blow the cool air into the chamber itself?
    Is that a Nepenthes in your pocket or you just happy to see me?

  4. #12
    Cardiac Nurse JB_OrchidGuy's Avatar
    Join Date
    Apr 2005
    Location
    SC
    Posts
    3,818
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)
    Well AC units don't actually separate hot air from cold air leaving the cold air. That is a simple way to put it, but it is actually more complicated than that. AC units and other refrigeration uses what is called phase change cooling. Ever noticed when you spray a can of dust remover when your cleaning your keyboard or spraying some other sort of compressed gas from a can and the can gets cold? That is the same concept with an AC unit. It compresses the coolant inside the closed system and compresses the gas inside the system. The compression process causes heat the gas actually heats up from being compressed. That is what makes the waste heat on the back side of the AC unit. Then as the gas goes through the system it expands on the inside section that cools the coolant coils. Then air is passed over the the coils and it cools the air. Now the other part of the equation is what happens to dehumidify the air. It is a secondary process that happens with cooling systems. It works a little like this. I am sure you have noticed a glass of ice water sweating as it sits on the table. That is because the glass is cooling the moisture in the air and it is compensating on the glass. That same principal happens on the cold coils of an AC unit. The moisture in the air condenses on the coils and that is the water you see dripping out the back of the AC unit or out the drain of house units. That is the phenomenon that dehumidifies the air. So with all that said it should make everyone's resonances make sense.

    If you have the AC attached to the back of your chamber it is going to dump the waste heat into the room and dehumidify the air int he chamber. If your AC unit is in the window and you duct the cold air into the chamber it is pulling air from the room and dehumidifying it and pumping it into your humid chamber. Then the dehumidified air is pushing out all the humid air through the cracks in the chamber. So what is being recommended is you pump humid air into the cool air duct so the air coming from the AC unit is rehumidified before it gets to the chamber if you decide to duct it in. If you have the unit attached to the chamber and so not care it heats the room then you will need to rehumidify the air in the chamber and the unit will "sweat" excessively and make a lot of waste water dripping from the AC unit.

    Or you can do as I plan to do when I get to MN. Take a chest freezer and remove the lid, then build the chamber, with a floor, on top of the freezer. It will have an intake and output hole with fans in each. One pushing air in and the other pulling it out. Oh there will be a tube on the output side so that it makes it suck the cold air from the bottom of the freezer up to the top grow chamber section. Now this system also needs to be humidified and you would occasionally need to defrost the freezer because it may get buildup from pulling the humid air into the freezer. Now also this system also uses thermostats and humidistats to control the temp and humidity as well, but those are easy enough to setup. The thermostats will just control the fans from coming on and off to pull air up from the freezer. The freezer will always run to keep temp. I got the idea from a guy in Sweden. The guy said he tried using a fridge but the fridge could not keep up with the temp drop he wanted. I think this will give you a better temp drop than an AC unit would. Oh BTW you would need to separate the light system from the chamber like a layer of glass or something. The guys chamber uses fiber optics but that is a very pricey way to go.

    Keep in mind this guys vivarium is very very pricey to build but I do believe a lower priced version can be made with the same principals in mind. I plan on using wood or the back and sides and a glass front. I will also put my lights behind glass so they will keep the lights separate from the chamber to keep it a little cooler. The walls will be insulated because I plan on making the wall look real with foam and the foam has a good R factor. If you go to the frog places website it will show you how they made a real looking terrarium with foam and peat over the top of it to simulate a rock face covered in moss. I plan on using a hybrid of the two to make a cool growing vivarium for my villosa and some hellis. Also a hamata when I get one as well as other highlander orchids and things.

    Here are his pictures with explanations.





    If you want to read the entire thread and the guys full explanation then here is the link.
    Cool vivarium thread
    JB
    Friend me on facebook with JB_orchidguy@yahoo.com.
    Growlist Updated 05/08/13

  5. #13
    rattler's Avatar
    Join Date
    Oct 2003
    Location
    missing, presumed dead
    Posts
    8,554
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    you want the hot air intake at the top of the tank for maximum efficiency............

    if you use a freezer one suggestion.....dont leave it empty....put something such as water bottles in it of something to increase the surface area that the air moving through the freezer hits.....prolly get more life out of the compressor motor and use less electricity in the long run...

    i wouldnt do it the way you have the fan running in the pic.....i would put the fan on the output hose, not on the intake hose....i think it would work better.....

    the idea i have is more complex than the above.....for one i would insulate the hell out of everything but the front viewing window if i was growing ultra highlands.....
    cervid serial killer
    Know guns, know peace, know safety. No guns, no peace, no safety
    I didn't get stimulated but he kept his promise on change, that's about all I got left!
    http://www.wolfpointherald.com/--http://www.safety-brite.net/

  6. #14
    Cardiac Nurse JB_OrchidGuy's Avatar
    Join Date
    Apr 2005
    Location
    SC
    Posts
    3,818
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)
    oh I planned on it. I just use those pictures as a reference because it is a nice setup and the first time I seen a cooled vivarium. I am going ti insulate the heck out of mine

    I would be interested in your more complex design ideas too BTW.
    JB
    Friend me on facebook with JB_orchidguy@yahoo.com.
    Growlist Updated 05/08/13

  7. #15
    rattler's Avatar
    Join Date
    Oct 2003
    Location
    missing, presumed dead
    Posts
    8,554
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    will likely be sitting bored in a hotel room this weekend.....will see 'bout doing up some drawings and a write up on my thoughts for you guys to critique.........
    cervid serial killer
    Know guns, know peace, know safety. No guns, no peace, no safety
    I didn't get stimulated but he kept his promise on change, that's about all I got left!
    http://www.wolfpointherald.com/--http://www.safety-brite.net/

  8. #16
    JMurphy97's Avatar
    Join Date
    May 2005
    Location
    Milwaukee
    Posts
    1,250
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Tony Paroubek View Post
    So are you saying to cool the room the grow chamber is in but don't blow the cool air into the chamber itself?
    Maybe that could work. This sucks. I thought it was a good idea. But now there has to be all this brain work. Is there any where I can get a step by step guide to doing this? I have a freezer already so that keeps costs down somewhat. Do I cut holes in the side and use the tubes/ducts that way?

Page 2 of 4 FirstFirst 1234 LastLast

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •