Fan type selection 1

[Jakelian]

Hi,

For a cooking product I am designing, I need a centrifugal fan which will take in the air from its central inlet as usual, and blow it not thru a single direction via its exterior case's opening but to all directions, in other words, 360 degrees. Is it possible? It is clean air, pressure loss is not important at all, but high flow is a plus.

If possible, which blade type (radial, forward, or backward) do you think is best for this application?

Thanks))

 

[Compositepro]

What you propose is often done in ovens where heating elements surround the blower wheel. Forward curved blades are most efficient for air. Radial is used in dirty environments.

 

[Jakelian]

Compositepro,

Thanks for your answer. I see now that my question is missing an important description:

I have seen those, the blade looks like water mills, and has heater installed around its perimeter. They turn the air around.

The difference is, I have to transfer the air from one room to another, in other terms, intake and outlet sections are in separate rooms.

Do you still have the same recommendation?

Thanks))

 

[Compositepro]

It seems you are way overthinking your problem or have not described it well. Why would you not use a standard blower and ducting, and then a difuser to direct air in whatever direction you desire?

 

[willard3]

>>>>>It seems you are way overthinking your problem or have not described it well. Why would you not use a standard blower and ducting, and then a difuser to direct air in whatever direction you desire?


+1

 

[dbill74]

Need more info about the cooking product.
Is this residential oven sized, commercial oven, etc?
How much air flow, CFM?
What is the temperature of the air?
How much space is available?

 

[Jakelian]

Compositepro and Willard3;

"Why would you not use a standard blower and ducting, and then a difuser to direct air in whatever direction you desire?"

Because first, I need the air in all directions, 360 degrees, so, I am trying to use the natural shape of the impeller to direct in all directions, while avoiding the costs of the shell, duct and diffuser. Second, I am trying to make it as small as possible, as height of that section, as the idea mandates it, technically. Third, horizontally, I am also trying not to have anything around the impeller. In short words, I do not have space. If I had the space, (height) I would use a simple axial fan. A lot cheaper than a centrifugal fan, lasts longer, have less noise etc. But the height limits me, even with very slow speeds, I don't think axial one can intake enough air, it can not change the direction 90 degrees also.

dbill74,
- Residential oven,
- Air flow: I don't have this info handy, I will ask my engineer friend and get back with that,
- 200C max,
- As I was explaining just above, I have a height limitation at that section, height of the centrifugal impeller can not be more than 1", because the room it operates is approximately 1". But as width and depth, I have standard oven size.

 

[dbill74]

Use an axial fan, something like a computer case fan, except one that can handle the the requisite temperatures.
Blow the air through a hole and against a plate.
Or you can just cut some louver/slots in the barrier to direct the air in the requisite directions.

Edit: Corrected typo.

 

[lilliput1]

Will this cooking product operate like an air fryer?

 

[ChasBean1]

You are describing a fan that is called a "plug" fan or a "plenum" fan. They are pretty much everywhere these days.

 

[Jakelian]

dbill, thanks; I will try to use an axial there maybe I can create some space, and make it bigger, so, with lower speeds, I can get the same amount of air. And I will place the motor outside, just like the fans of those std ovens have. I just checked the fan Chasbean1 recommend, it seems like the solution, but it must be a lot more expensive than an axial one, so, I will try to make it with the axial first.

lilliput1; it is similar, but the room shape, timing and capacities are different. I am afraid I am not permitted to declare certain details yet. However, thank you very much for showing attention and giving time, thanks.

Chasbean1, thanks a lot, I checked and found them! ))

Guys, thanks a lot))