Heat Issues with MH Help!!!

A

ashkeenon

New member
Hello

Well My problem is i have a 10G tank with 70w MH with 14k lamp and 24w Actinic blue. I have mounted 2 60mm PC fans however my temp is sitting at 28 when the MH lighting is on. What else can i do to reduce heat. Cant afford to buy a chiller. Heres some pics of the lighting.

marine_log_79.jpg


marine_log_112.JPG


Cheers

Ash
 
<a href=showthread.php?s=&postid=8929318#post8929318 target=_blank>Originally posted</a> by mahoneyc3
switch to t5s.......
Click to expand...


Watts are watts. 70 watts of MH makes the same amount of heat as 70 watts of T5. ;)


I agree that you'll need to work on your fan setup. It looks like you've just got a couple of fans hanging from an open back. You should get the canopy as enclosed as possible and then use a combination of fans and holes to force as much airflow across the surface of the tank as you can. The caveat is that you'll have to deal with evaporation.
 
The canopy has an open back one fan blows air in and the other blows air out. Was thinking of drilling some holes on the top and blowing air in so the hot air goes up and out. Was also thinking what Doug was saying mounting them on either side of the hood and creating a line of air passing through.

Ash
 
I use 4 of the 4-1/2 inch 76cfm fans. That would be overkill for a small tank but I have them all blowing in and the outlet is the back of the canopy. If you put your hand up at the back of the tank you should feel a pretty good breeze of warm air coming out. Seems to work well. Yes I do go up in temp about 1 to 1-1/2 degree's when they're on but if I turn them off I'd probably go up 5 or 6 degree's.

With enough fans you need to have a good top off system/routine. Mine increased the daily evaporation at least 1 gallon per day if not more.
 
"blow both fans at the waters surface"

this eliminated any heat issues I had, especially when I put a 6" fan in the sump blowing at the water
 
60mm fans are small, even computers generally use 80mm fans as a bare minimum with 120mm fans being preferred. Switching to those would move twice the air you are currently moving. Also try and get them to work together and move air across the surface of the water. This will help evaporation, and thus cooling.
 
Guys, you dont even need to blow them at the surface. You just need to get all that hot air out of the hood. Think wind tunnel
 
10 gl tank......

Need holes or slots in the top of the canopy (heat rises) let thermodynamics work for you. Fans need to be larger. I agree with Rich on this, need to get the hot air OUT of the hood. Evaporation on this size tank will help but wont overcome to a significant point the trapped heat in the hood.

To ramble...... If the air over a small pond is 100 degrees and the wind is blowing the pond will only cool down to a certain point. No matter how hard the wind is blowing (depends on humidity etc) But if it is 85 degrees with the wind blowing over the pond, the pond will be cooler.

Get the heat out of the hood area as efficiently as possible.
 
Hi thanks for all the ideas much appreciated, good job i aint got any livestock yet.

Think the plan is to remodel the hood make some holes in the top and blow the fans like a wind tunnel as RichConley was saying through one side out the other and also henry you were saying let thermodynamics work for you do this by making holes vents on the top of the canopy, bigger fans may be good aswell but the noise bothers me will have to gt some silent ones. if they exist.

Will let you know how i get on

Thanks

Ash
 
Aspire sells some good 80 and 120 mm fans that are pretty silent. The move alot of air too. Antec too. I didn't realize it was a 10 gallon tank, scratch what I said about evaporation =)
 
Thanks

Think im gonna go for a hood remodel. Im gonna raise the MH up from the water by a couple of inches and have most of it on the otherside and a fan to cool the MH.

Im also going to drill some vents in the top as when i open the lid about an inch or two the temp goes down to 80 with the fans blowing in. Either that or buy a chiller think i will give that a try first. bigger fans to as redmonkey says blowing air up and out the vents.

Thanks

Ash
 
Just another thought when i was out taking the dog a walk that its freezing here and then thought what about thermal bridging in terms of using the coldness of the granite walls to cool the tank. Not sure if it would make any substantial temp difrence.
 
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