CurtPalme.com Home Theater Forum

[skippyar]

My projector overheated, went nuts and powered off the tubes yesterday . Its only ever does this twice, twice too much. I believe it's due to the lack of a decent venting system to control its temperature when on for long durations as the entire lounge gets really warm!

I was looking at "Kal" 's system which looks really good, he mentions extracting the warm air. I have an extractor already (temporary setup), however, I'm using its back-to-front. So pulling IN air from the chimney (roof) to blast cool (er) air over the CRT, in a fan fashion.

The housing my CRT lives in is kinda its "hushbox" which I'm going to expand on and include a venting system properly via the ceiling.

Which is the correct method of maintaining a cool environment for a CRT in a "passive" (completely sealed / highly insulated / no air circulation) lounge; blasting with air from outside or extracting air to outside.

My concern is the "turn over" of air supply because obviously I need to breathe, so I'm thinking I probably should have and input and output duct for the entire room that includes a duct over the CRT as part of the cycle.

I'm still chewing on this so any thoughts would be appreciated.


*EDIT*

Here's a little photo including a mock up of where I'm thinking of having the supply to the CRT through the ceiling.


http://www.flickr.com/photos/skippyxp/3920881034/

*EDIT AGAIN*

Kinda mocked up an idea to cycle the air over the CRT.

http://www.flickr.com/photos/skippyxp/3920289727/

[dturco]

Well as a matter of safety DO NOT vent anything into a chimney. Chimneys are only to vent combustible gas by products. This means that the gas by products can and will find a way back into your comfortable lounge and kill you with noxious fumes.

DO NOT DO THIS.

[skippyar]

Ahh, apologises for this mis-info about chimneys, they're "technical" name is roof-vents (i think):

http://www.brooksjensenarts.com/new100/content/bin/images/large/Roof_Vents_and_Shadows_2009.jpg (image)

I've just labeled them as chimneys whilst sketching a design, nonetheless you are absolutely right.

[dturco]

To answer your question, venting the heat out is the best way. Pulling cool air from outside might work but your still messing up your living space with un-conditioned air , and just blowing the P/J's heat around in your home. Installing a completely separate exhaust duct through a { roof vent here in the states} is the best choice. If it's something you can do yourself, otherwise it might get expensive ,but would be the best solution.

[skippyar]

[PaulB]

Hmmm, interesting. I too have thought about just having cool air "vented" onto the pj. My projector will be mounted on the ceiling with just an empty attic space above it. I had thought that simply putting a vent hole in the attic space directly above the pj (a 9500 whose intake fans are on the bottom of the pj - when on the ceiling they are on the upmost ceiling side) and let the cooler air flow into the pj with no need for any powered vent.

The vent hole could be covered when not in use.


Sort of like this:




Whilst not ideal, it would keep the pj and the temp of the room down as the pj would constantly be fed cooler air rather than recycling hot air. Its cheap and nasty but easy to do - what do you think?

For Paul, I think you're possibly over-engineering your solution, I'd be inclined to simply suck the hot air out in that sort of setup (as should I but don't have the room nor expertise to do it). One tube sucking out the hot air, with the pj not recycling ever increasing hot air it should stay cooler.

I had a Barco 808 that by the end of a movie you were sweating the air was that hot, hard to belive that your 500 is even worse! By the way, theres a 708 not far from you going for peanuts on EBay at the moment, be a nice upgrade if the tubes are good, its faulty but no doubt repairable - no connection to me, just a heads up if you were interested Item number: 260475282944




What an artist there is in me

[skippyar]

Cheers, I'll have a look at that Barco on Ebay, thanks for the heads up.

I know my Barco isn't brilliant and only an entry level crt, however, I think everyone would have that same gut feeling when the damn thing breaks down, which is why I've decided to sort out this venting issue.

I've been trying to source a local service and repair contact in the event that something went drastically wrong.

That diagram is somewhat over the top, the recycling of air was more to do with un-conditioned warm air ending up in the lounge and over a couple of hours the room would be so warm that the pj would inevitably overheat.

In the summer I have been down to my skivvies with the windows open.


Your design wouldn't work for me as I have a plank of wood across the back and the fans pull the air towards the motherboards, so I'd have to come in from the side to vent.

Diagram: http://www.flickr.com/photos/skippyxp/3922595912/sizes/o/

[skippyar]

Bloody hell that Barco 708 has a starting bid of .99p O_O

I wonder if that fault has anything to do with the Barco solder issue around the power supply region as Curt's FAQs mentions:

"Barcos are known to develop bad solder connections, specifically in the main power supply area. The Barco 500, 800 have the unique problem that if a certain solder connection fails on the power supply, all three tubes can be burnt instantly."

Max Resolution (pixels): 1280 x 1024 is handy as that might allow me to purchase a HDfury2 and benefit from 1080i (i guess) HDMI etc.

Picked up my AVF speaker wall brackets today that I won on Ebay for 1.00 GBP / 1.65943 USD \(^_^)/ now my setup is complete.

[PaulB]

[Ile]

Here outside temp chances about 50 degrees during year, so I can't use outside air for cooling projector. Cooling air should be as constant as possible to prevent drifting in projector.

I wont like to lead "free" heating energy to outside in winter time, so I ended up using projector for heating my bedroom. In summer time I have to open window though.

I have two Barco 120 mm NMB fans blowing cooling air from bedroom floor level to my hushbox and projector blows hot air to bedroom ceiling level. Very quiet and stable solution and projector wont heat theater room.













Here's more construction pics.
http://www.curtpalme.com/forum/viewtopic.php?p=121244#121244

[skippyar]

Hei hei!

Lovely sleek black setup you have, looks excellent.

You mentioned channeling the warm air and recycling to provide heating. I have actually considered doing exactly the same thing as yourself into my bedroom which is on the "coldest corner" of my home.

I was originally going take to heat from my PC which is left online 24/7 to warm the bedroom to help prevent damp air at winter and other potential annoyances.

Your design looks very methodical and well implemented.

The cool air inlet idea works well here (UK) for myself as I generally watch TV/films/etc in the evening and the outside temp is 15c.

[PaulB]

You guys are lucky, the hot air from your pj's tends to come out in one area (usually where the exhaust fans are blowing), on the 9500 it comes out all over the place, they have internal circulation fans rather than exhaust ones - not so easy to deal with if looking for as single outlet duct solution

[dturco]