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Thread: Fan + water=cooling?

  1. #1
    kentosaurs's Avatar
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    Fan + water=cooling?

    I heard somewhere in forums that if you spray your neps and give them wind/fan it would help to reduce the temps....Well i feel thats possible since at night nowadays its quite chilly when the wind blows after a rain or during....So has anyone try it??

    Other than that, is there such thing as a battery operated fan which is strong enough to blow some of the neps They aren't quite big though..At night sometimes the air is quite still soooo i thought of this..

    If you have tried it or at least know stuff about it please share with me..
    Well i have a growlist her but anyways heres mine in another forum.

    http://www.forum.petpitcher.com/showthread.php?t=1119

  2. #2
    Let's positive thinking! seedjar's Avatar
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    You do get a little bit of cooling from evaporation, but a spray bottle and fan are not going to give you any noticeable drop in temps - certainly not enough to make it worth your trouble. Unless, perhaps, you lived in a desert area where the ambient humidity was extremely dry (<25% maybe.)
    What you want is a swamp cooler, or an evaporative humidifier (not ultrasonic, not warm-mist.) An swamp cooler is basically a larger-than-usual evaporative humidifier that is built to take in warmer, dry air from the outside instead of recirculating inside air.
    A swamp cooler would be preferable, since they're specialized to maximize the cooling effect, but both work in precisely the same way. Uncooled air is circulated through a porous or spongy wick that's saturated with water (preferably cool water, but not necessary.) Although the air isn't at a boiling temperature, it still exerts a pressure on liquid water to evaporate, which is proportionate to the surface area of the liquid water, the relative humidity of the air, and the difference in temperature between the water and air. The drier the input air the better - cooling stops altogether when the RH is 100% and is dramatically reduced close to 100%.
    When liquid water becomes a gas, it takes some heat from the things around it to stop moving as a liquid and take to the air. Although much of this heat absorbed makes the evaporating water warmer, there's a part of the heat energy that literally turned it into a gas, which is stored inside it and doesn't add to the physical temperature. (When the vapor turns back into a liquid or solid, that energy is released.) So the air that comes out of the swamp cooler is really cooler than when it went in - it contains the same amount of energy, but some of it is bound up and unable to warm you. (Or your plants, as the case may be.)
    A fan and spraying water does the same thing, but at such a small scale that you would almost never notice it (unless you want to set up a sprayer irrigation system that runs all the time, but most of the cooling from that would probably be convective, I believe, which is different.) A specially designed wick, even at a smaller size than the total surface area of your plants, can do a much better job at cooling.
    ~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//~

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    swords's Avatar
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    Here is my highland cooling setup (excuse the clean room!)


    There is currently a 5" 65 CFM computer fan in the window mounted to a "duct collar" (flat piece of metal with a 5" hole in it) the collar is mounted to a flexible aluminum duct allowing the air from outside through the 4" flexible aluminum dryer vent duct to the plant shelf. Right now the window is only open a little bit. When the temps are too cold I shut the window and the air at the surface of the window is cold enough to bring the temps down.

    At each taped area is a duct "T" which allows some of the cool air to empty out onto one of the three shelves where the plants grow. The top of the duct is an " L" which empties the last of the fresh air, also it get's the most fresh air so despite physics/thermal dynamics/whatever the top shelf is actually the coldest! lol

    Currently I only have a few CPs in some covered tubs on shelf #2 the rest are succulents but when I switch the top two shelves over to HL plants next spring I will simply glue a 2" diameter hose into the output hole of an ultrasonic humidifier from the pharmacy and cut a hole in the air duct and place the humidifiers output hose into the duct so I'll have cool wet air blowing into the shelf. This is how I cooled & humidified my HL Neps when I grew them before. It's very easy to do this cooling project if you live where it gets cold enough.

    People in the south can do the same but instead of pulling air from outside which could be too warm place a "wide vent" output on the rear end/window side of the PC fan and place the wide vent potion over the output of a 10,000 BTU window A/C unit. This costs a lot to run (I did this for HL Neps from mid June-mid Sept) but you'll get your cool temps.

  4. #4
    Let's positive thinking! seedjar's Avatar
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    Quote Originally Posted by swords View Post
    At each taped area is a duct "T" which allows some of the cool air to empty out onto one of the three shelves where the plants grow. The top of the duct is an " L" which empties the last of the fresh air, also it get's the most fresh air so despite physics/thermal dynamics the top shelf is actually the coldest! lol
    That's no "L" at the top -

    Your duct is obviously an "E"! Or is it an ""?
    Aha! I should've known; it's Phonecian:

    ~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//~

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    Quote Originally Posted by swords View Post
    Here is my highland cooling setup (excuse the clean room!)


    There is currently a 5" 65 CFM computer fan in the window mounted to a "duct collar" (flat piece of metal with a 5" hole in it) the collar is mounted to a flexible aluminum duct allowing the air from outside through the 4" flexible aluminum dryer vent duct to the plant shelf. Right now the window is only open a little bit. When the temps are too cold I shut the window and the air at the surface of the window is cold enough to bring the temps down.

    At each taped area is a duct "T" which allows some of the cool air to empty out onto one of the three shelves where the plants grow. The top of the duct is an " L" which empties the last of the fresh air, also it get's the most fresh air so despite physics/thermal dynamics/whatever the top shelf is actually the coldest! lol

    Currently I only have a few CPs in some covered tubs on shelf #2 the rest are succulents but when I switch the top two shelves over to HL plants next spring I will simply glue a 2" diameter hose into the output hole of an ultrasonic humidifier from the pharmacy and cut a hole in the air duct and place the humidifiers output hose into the duct so I'll have cool wet air blowing into the shelf. This is how I cooled & humidified my HL Neps when I grew them before. It's very easy to do this cooling project if you live where it gets cold enough.

    People in the south can do the same but instead of pulling air from outside which could be too warm place a "wide vent" output on the rear end/window side of the PC fan and place the wide vent potion over the output of a 10,000 BTU window A/C unit. This costs a lot to run (I did this for HL Neps from mid June-mid Sept) but you'll get your cool temps.

    That's how I can get Highlanders! You sir, just made my day.

  6. #6
    Let's positive thinking! seedjar's Avatar
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    Swords did another thread several years ago with a spiffy diagram of an AC/window intake, humidifier and ductwork. That method helped me out a lot until I figured out that household conditions in this part of the country are actually really good for highlanders. :P
    ~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//~

  7. #7
    swords's Avatar
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    Joe, you keep your house 50*F at night!? Staying at your house would be like camping! lol

    I'll try and whip up a new diagram for highlanders that should be more informative than my photo, I doubt I'll be able to find the old one.

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    So would 60F be low enough to grow one of these or would 50F be more ideal?

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