Green Giant
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The other night I was in the garden and stood up underneath a hps and man was it hot!!!
So that got me thinking about venting/cooling with air, but what air and what temp should this air be???
I can assume I do not want to pull outside air into the garden, but do I want to use air conditioned air that's aprox 70* I would think the hot bulbs would not like this!!!
What is your thoughts on this??!
I think that is a waste of money. Don't cool the air used to cool bulbs- just send it back outside. The temp rise between inlet and outlet is what you're trying to maximize- but spending money to actively cool this equipment is not going to net any measurable return.
If outside air is just too hot, then use air from your air conditioned house. This worked great for me when I lived in the Deep South.
Condensation happens when hot moist air encounters a cool surface below local dewpoint. Light bulbs are anything but cool! BTW, this is also why you do not place an Icebox or other cold water to air heat exchanger in your hood venting system. These often shed droplets of water. Water droplets + hot light bulb = no bueno.
If you plan to use super cold winter air to cool your room, be sure to PUSH the cold air in with your fan on the outside of your grow. This way condensation will not form on your fan. Add a good damper on the grow air side and you're golden.
Outside air->-Fan-->--damper--------->------duct->--grow room---->>>
Me too. Super cold air causes unexpected dew sometimes, thus the mylar gutter... but a fan controller is the real solution for worry free year round use of outside air.
There is a point when the outside air is too cold and begins to change the lamp's performance. Hopefully somebody chimes in with an explanation about that, as I know nothing specific.
I have a xxxl hood and have been using the air from inside my house to pull through my hood for over a year with no problems, it typically stays in the 65-70º range in my home also. I can hold my hand to the glass on the hood in the middle of on time and its hardly warm to the touch. I hope this helps.
Good points. Tho I was talking about cooling the room. I agree that air should be pulled through hoods, however pushing air into a grow space is just fine.
As for the condensation on the outside of hoods -- I have always been concerned about drips falling on the buds, so I catch them before they do. cheers, ftw
The reason I recommend that people don't ever push air into spaces to cool them has nothing to do with the size or use of the space; the fact that gas (air) is being compressed (pushed) by a fan (even more heating, due to ) means that it will always be warmed up. If this air is to be used for cooling, pushing the air around goes a long way towards defeating the purpse!
Pulling air reduces its pressure- and therefore temperature. Thus, the exhaust fan, hopefully mounted high in the warmest part of the room, is the fan really doing the work of cooling.
The only time I push air to cool it is when I'm shoving air through an Icebox air to water heat exchanger. I push warm air into the box, thus warming it further and increasing the temperature difference between air and water, thus boosting the exchanger's efficiency.
The reason I wanted to push air in was so I dident pick up any smell from my rooms if I had some leaks in my hoods. I did not plan on filtering this.
The reason I recommend that people don't ever push air into spaces to cool them has nothing to do with the size or use of the space; the fact that gas (air) is being compressed (pushed) by a fan (even more heating, due to friction) means that it will always be warmed up. If this air is to be used for cooling, pushing the air around goes a long way towards defeating the purpose!
Pulling air reduces its pressure- and therefore temperature. Thus, the exhaust fan, hopefully mounted high in the warmest part of the room, is the fan really doing the work of cooling.
The only time I push air to cool it is when I'm shoving air through an Icebox air to water heat exchanger. I push warm air into the box, thus warming it further and increasing the temperature difference between air and water, thus boosting the exchanger's efficiency.
I just installed fans and ducting to vent my new AC box, and can witness to this wholeheartedly. I tried both methods, positive pressure made a huge efficiency difference, not in a good way. I was trying to avoid overheating my blower motors with the exhaust by installing them on the intake side, but suddenly the compressors couldn't keep up as they had in the original pulling configuration.The reason I recommend that people don't ever push air into spaces to cool them has nothing to do with the size or use of the space; the fact that gas (air) is being compressed (pushed) by a fan (even more heating, due to friction) means that it will always be warmed up. If this air is to be used for cooling, pushing the air around goes a long way towards defeating the purpose!
Pulling air reduces its pressure- and therefore temperature. Thus, the exhaust fan, hopefully mounted high in the warmest part of the room, is the fan really doing the work of cooling.
The only time I push air to cool it is when I'm shoving air through an Icebox air to water heat exchanger. I push warm air into the box, thus warming it further and increasing the temperature difference between air and water, thus boosting the exchanger's efficiency.
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