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Old 01-16-2004, 01:20 PM   #11
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Well my thinking is that hot air rises and with vent slats directly above the bulbs the hot air will want to go up thru those slats. having a fan pulling air out will basicly have to pull the air back down thru the slats counteracting the natural desire for the air to rise out.

if you pushed cool air into the unit then the warm air would rise out of the top thru a higher internal pressure and thru natural warm air rising effect.
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Old 01-16-2004, 01:22 PM   #12
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good points.

This is a pendant though... hmmm

well I just downloaded a textbook on heat transfer and thermodynamics... i'll see if I can glean anything out of that.
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Old 01-16-2004, 01:23 PM   #13
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sorry, I'll share the link )

http://web.mit.edu/lienhard/www/download-ahtt.shtml
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Old 01-16-2004, 02:19 PM   #14
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k... I now know more about thermodynamics than I ever wanted to know... and I still don't know very much lol. I'm also reminded of why I changed majors in college from engineering to CS.

anywho... things to consider in this debate:
This is a pendant, is the bottom of the pendant enclosed? therefore making this a sealed unit to direct airflow? (if not, you may wish to consider it, it will help with keeping the tank cool)

The vents are located top and center of the hood, however, there will likely be a reflector of some sort located above the lights and, therefore, between the light bulbs and the vents themselves.

can you give us a little more info on the placement of the bulbs and reflectors in your hood JackDP and if the you plan on putting a glass/plastic bottom on the pendant?
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Old 01-16-2004, 05:44 PM   #15
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There will be a single spider reflector mounted in the top of the hood. It will be mounted via 4 screws and kept approximately 1/2 inch away from the top to allow for airflow above the reflector. The reflector itself has vents in the top of it to allow heat to escape above the reflector and thus through the top vents in the hood. I've cut holes for 4.5" fans on each end of the canopy but only plan on putting in 1 fan initially. I already have the second fan if I find it is needed. There will be a 21" 55 watt PC bulb mounted in front of and in back of the MH (centrally mounted.) Ballasts will be located remotely to keep ballast heat out of the hood. At this time there are no plans to cover the bottom of the hood, this can easily be added in the future if it proves to be a problem.

And fishfreek..you are correct, if it did sit directly on top of the tank it would be hard to get to the water :lol
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Old 01-16-2004, 07:18 PM   #16
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Hi Jackdp,

I've built a few of these and thought I'd just mention a few things I thought about when building some of mine.

First off - looks really cool - nice job.

It seems that the reflector is already mounted on the inside (I am not sure about this but I seem to see it through the cut out for the fan). Just wanted to suggest - and you may have already thought this out - that you should be sure to finish the inside of the canopy with whatever finishing material you are using (a good suggestion is polyurethene). I suggest this cuz I made the mistake of not doing this on one of mine - i.e. only finished the outside, and sure enough, the dampness from the tank (dispite covers etc.) managed to effect the wood.

Bottom line on this: Since it is wood used over a water based container - best to have it totally sealed.

Another suggestion - something I discovered very useful on one of my canopies - I mounted the timer directly in the canopy along with override switches which alow you to turn the canopy on even if the timer has it off. I placed switches on a strip of aluminum, routed an opening in the front of the canopy and recessed this into the front. Looks very cool and provides full control of all lamps from the front of the canopy.

Anyway - the monster looks great. Hope to see pictures when it's complete.

Tom
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Old 01-16-2004, 07:41 PM   #17
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How high will this hang above the tank? There is a big loss of light the higher it goes since more light will end up around the tank than in it.
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Old 01-16-2004, 08:01 PM   #18
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Quote:
Just wanted to suggest - and you may have already thought this out - that you should be sure to finish the inside of the canopy with whatever finishing material you are using (a good suggestion is polyurethene).
The inside is painted with a gloss white enamel to aid in reflection of light. The outside will be stained with a polyeurathane stain.

Quote:
How high will this hang above the tank?
What do you suggest? I was thinking of hanging it only as high as I have to to make getting to the water for testing and feeding easy. I will probably also use open hooks and chain to hang then I can raise and lower by pulling up links as necessary. i.e. I can raise it 10 links higher and lower every week or so by a few links to aid in acclimation.
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Old 01-16-2004, 11:19 PM   #19
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So it would be like 6-8" above the tank?

I wouldnt mind kevins advice here but I would think a thin sheet of clear plexiglass between the bulb and the water could be of help. It would zero out the chance of the water getting onto the hot bulb and causing it to blow plus it would make the canopy an air chamber for the fan and vents to operate.
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Old 01-16-2004, 11:25 PM   #20
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My CSL pendant came with a glass splash shield, one of the first things I did was remove it, my MH bulb is about 7-8" off the surface of the water with nothing between it and the water. Aarons is better and safer advice, but I haven't had a problem.
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