Cooling an Oven Door Without a Fan or Blower

Please inform if you need to cool down the door itself, or if you can only cool down a handle for the operator. THis would be a lot simpler and cheaper.

Metal surface: should be max : 70°C , glass surface: max:85°C, plastic: 105°C. Handle is made of plastic or painted metal, or aluminium,; outer surface should be glass and /or metal or only glass. Oven touching surfaces temperatures should be below those limits.

I think you need to explain what the oven is used (domestic/industrial etc) for , and also in what way is the heat of the door a problem.To offer a suggestion that helps requires a bit more info.

Its Domestic appliance, and oven outside temperatures- human touch surfaces- front side of oven- should stay below those limits: glass-max temp: 85°C, metal -max 70°C, plastic- max 105 °C.

Fan or blower solution creates noise, it occupies space and expensive also.

I'm not sure where you're at here. My domestic oven stays at an OK temperature. Are you designing an oven and want to know how to keep the outside cool ? All my oven has is a gasket and some airspece between glass panels in the door.

How about adding a thermal insulator to the inside of the door? There are many good materials available these days.

My domestic oven is just like this:

From the inside, a gasket around the cover to isolate from the oven heated surface itself. Then, the inside of the cover has the same steel sheet from the rest of the oven. There's an inside glass attached with simple screw handled supports in this sheet.

Then, there's insulation inside the cover (I think it's just glass fiber) and a frame that actually builds the cover vontour isolated from the inside sheet by another gasket. A painted glass closes the front side, isolated and atttached to the steel sheets by gaskets. The plastic handle than in attached to the outer frame.

If your oven cannot operate safely with a similar configuration, I'd suggest simply to add an intermediate steel sheet isolated from the inside cover and outer glass. This should be enough to avoid radiation from inside the oven to heat the external surfaces too much. If the oven allows it, you can also think about some openings between the isolators of the cover to, by natural convetion, allow some cooling of the external surfaces from inside.

I was thinking something like this:

http://www.microtherm.uk.com/assets_db/downloads/datasheetsRigid/big/DataSheet-HydroPanel.pdf

Firstly, can you prevent the oven door from getting hot in the first place?

Would some sort insulation solve your problem? What part of the door gets hot and must be cooled? The outside? The inside? Please describe your problem in more detail as what you've supplied so far is pretty sketchy.

-e

Convection. If I inspect the door on my conventional (Kitchen-Aid, very good brand) kitchen oven, there are vents at the bottom and top, allowing air from outside the oven to be drawn in at the bottom, flow between the inner and outer glass panels, and exit the top by convection, drawing away heat from the outer surface. I'm sure there is insulation between the inner and outer steel panels, and some method of minimizing thermal bridging(minimal surface contact) between the two where they meet at the edges. I would think a reflective inner surface (polished stainless steel, perhaps) would help as well.

REVERSE ENGINEERING is fast and cost effective!

Go buy a used oven for $25.00 or so and take the door apart.

This is not rocket science, oven manufactures solved this problem about 5 years after the discovery of fire.

Well said.

Is there any reason you can't try this Albatross ?If you don't understand what you see describe it and I'm sure someone will assist -Like prbarry says , it's really not that difficult to copy even if you don't comprehend the thermodynamics.

Blow on it.

You're kidding right? You don't really have this problem do you? I think you're a physics graduate who couldn't get a teaching job and you are living vicariously through this forum. How about "Ways to cool off my steering wheel after leaving my car in the sun for a couple of hours on a hot day in the South." That's more interesting and practical. Oops, gotta go, I think my casserole is burning...

The source of confusion, I think, is that here we're dealing with a microwave oven. The problem is really one of getting rid of the leftover radiation.

Thanks for all the suggestions and support to my original question. JR PECK (#6) and BRAVE SIR ROBIN (#16) seem to share my exact concerns best. When I open the door of my travel trailer refrigerator the small amount of propane used to cool the refrigerator does not cool the entire trailer. Does anyone know if a mirror lined satellite size dish focused on a refrigerant line to an absorbtion (or adsorbtion) system would provide enough heat for a viable air conditioner. I believe the tracking/panning problem of keeping the dish pointed at the sun is minor.

Dear Mr. Ersan Taner.

would u explain, what material of oven door is being used, and is this oven is for domestic/industrial use

Dear friends

For your questions,briefly, We are cooker/oven producer. We have a serious problem on this topic, cooling an oven door (from outside the oven ofcourse). Definitely we tried many materials for insulation (eg: glasswool, rockwool, ...) inside the oven. We used 3 or more glass to make natural convection (usually 2 glass are used at inside and outside) , Low emission (low-e) glass is used inside for reflecting radiation back to oven cavity. Our restrictions: glass will be max 85 C, plastic(for handle): 105 C, metal will be 70 C, in order not to get hurt human, child ,etc. , in standards. We still have problem with these temperatures. Of course we tried many experiments with oven.

Using Blower, is an expensive and noisy solution. We don't want to use fan or blower.

Its very hard question and I'm still searching a new insulation materials, or anoher design choices.

You want a good insulator, in other words? Is that the real question?

Look into aerogel. And don't be fooled by the name. It's not a gel at all. If you want a good insulator, there isn't anything better, and I'm not kidding.