[Moebius]

Ok, long story short, I just purchased a new TV stand for the 65" plasma that's coming Friday. The stand is enclosed with glass doors. Between the TiVo, BluRay, and Amp, I can tell it's going to be too hot with the door closed (TiVo temp around 47c open, went up to 52 after about 90 minutes closed).


Here's the trick. I had to cut a pretty large cutout in the back panel (about 3" high by 12" wide) to allow the amp to fit with the plugs and such. The amp sits on the bottom shelf, with a TiVo and BluRay on the upper (there's about a 1" gap at the back of the shelf for wires and such). With that large of a hole, would I be able to just pop a 120mm fan in the upper portion to exhaust some heat? Or would I still need an intake fan as well since both the hole and the fan are in the back panel?

 

[sic0048]

So let me make sure I have it right in my head. There is a shelf breaking the unit into two halfs. There is a large hole on the bottom half of the unit (3"x12"). There is a 1" gap between the shelf and the back of the unit that could allow air to flow through. You want to put a 120mm fan in the back wall, but in the upper section of the unit (where there is no hole currently. Is that correct?


If so, the hole in the bottom of the unit is clearly large enough to provide air flow into the cabinet. The problem I see is how that air will move through the cabinet and out the exhaust fan's hole. I think the 1" gap in the shelf at the back of the unit is NOT going to be sufficient to clear out the hot air. That gap is simply going to let air flow around the rear of the unit. It will come in the rear hole, immediately go up the 1" gap and exit the exhaust fan hole. There will be little to no air flow in the rest of the cabinet.


You must find a way to channel the air flow around the rest of the cabinet. I see several methods of doing this. I think you need to seal up the 1" gap as much as possible in any situation to prevent air from flowing up into the upper half of the unit via the gap. Then you need to find another way to get air flowing into the upper portion of the unit. You could either drill holes in the shelf near the front - which would allow air to flow from the rear portion of the bottom cabinet, to the front rear, up to the top front via the new holes, and out the rear fan hole. This will resullt in much better air flow throughout the cabinet.


The other method would be to somehow create a new hole in the front of the upper cabinet to allow air flow into it. This might be a hole on the side of the cabinet. While this approach is probably less likely to meet your satisfaction, it is another method.

 

[Moebius]

Actually, reading your reply just made me think about it a bit. There's a gap between the front of the shelf and the door as well, but I don't think it will help too much. Even if I sealed the back gap a bit forcing it to pull air up from the front, that air would be coming off of the receiver on the bottom, and likely pretty darn warm (especially as I'm thinking of getting an Onkyo 707). So basically, the TiVo and BDP would have a steady stream of hot air flowing through them. Which is now leaving me to wonder if I should put an exhaust on the lower with a vent (or possibly intake fan) on the upper. Even though that defies the standard cool in low/hot out high methodology, it seems like the only way I'd get the upper units to stay cool.

 

[Wayne A. Pflughaupt]

Maybe this will give you an idea of what needs to be done.

Regards,

Wayne A. Pflughaupt

 

[Moebius]



Quote:
Originally Posted by Wayne A. Pflughaupt /forum/post/18115141

Maybe this will give you an idea of what needs to be done.

Regards,

Wayne A. Pflughaupt

I'm assuming there's an attachment there, but I can't seem to get it to load (even trying the URL direct).


On the center, since I haven't decided on the fan/power combination just yet, I got a 2.5" hole saw and made two "vent holes" on the upper level rear. Since the TiVo has a fan, I'm hoping the air will move a bit anyway. If not, I can add the fan to exhaust some air. I'm also going to put some cabinet door stops on the front doors to crack them open just a bit. Won't be much, but might draw in a bit through the front without major surgery on the unit (so far I've isolated everything to the back panel, which feels like 1/4" plywood - definitely sturdy).

 

[Wayne A. Pflughaupt]

Can you see it now?


Regards,

Wayne A. Pflughaupt

 

[Moebius]



Quote:
Originally Posted by Wayne A. Pflughaupt /forum/post/18122522

Can you see it now?


Regards,

Wayne A. Pflughaupt

I can, and thanks. That's pretty much where I'm at now, minus the exhaust fan. Lower shelf has a large hole (approx 3"x15" I'd guess - was a rough cut with no measuring). Upper shelf now has 2 2.5" holes. I also placed some felt door stops on the cabinet doors to try and let a little air in, though it has to be pretty minimal.


So far, with the holes only, I got about a 4 degrees Celsius drop in the temp with the amp on (TiVo reads 48-49, was at 52). Idle temp seems to be around 47. My next hunt is finding the exhaust fan I want.

 

[Home2stay]

Convection, deflection, what's your perfection

Not a big fan of adding additional power consumption, personally

What I did and confirmed a benifit, is to pitch the above shelf

Basic law is heat rises, if you put heat into a rectangle box, it flows equally out the sides


By pitching the above shelf either fore or aft, it causes the rising hot air to flow in one direction, thus intern, creating a draft that will draw air in the other side creating flow.


Disadvantage is esthetics[sp]. If you can pitch the above shelf you can always, shim the front feet of electronics


My AV-R and DVR were under and over, my cutouts are on the lower and upper back of top shelf and cut the top shelf floor, two inch short in rear so flow goes up and out. I do have some spaces in the front glass as well, and have noticed a internal drop in the of 20-30degF


Peace

 

[jcgeny]

have you think of using a notebook cooler ?

i have took one : the ZM-NC2000 http://www.zalman.co.kr/ENG/product/...ad.asp?Idx=280 after i read in the section "before you start" of the manual for the pioneer vsx-1019 that touching the receiver's bottom could cause burns .

it is a good thing to cool it also for lifetime

 

[Geek From NJ]

 www.coolerguys.com just put one fan in there simple easy and worked dont over think it like i did