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Old 08-07-2015, 07:19 PM   #1
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Will this setup work for fridge fan?

I decided to replace the fridge fan on my Bambi sport 16. That fan system hanged down and blows air out the side ( there is no top vent). My RV service person replaced my fan with two nocturas per my request, but has the facing up. He insists that is better. Is that right? I would presume Airstream had a reason for hanging it the way they did. Does it matter the way my service guy did it?
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Old 08-07-2015, 07:42 PM   #2
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Fans laying flat may live longer. Less strain on bearings. Better airflow with them together like that.


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Old 08-07-2015, 08:37 PM   #3
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Well, we mounted horizontal on ours but we have roof vent.

Seems as
Long as the fans move the air over the fins and "out" they should do fine.
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Old 08-07-2015, 08:48 PM   #4
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I don't think it will hurt to try, looks interesting. I've tried a couple of different things with fans and I am still not satisfied.
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Old 08-07-2015, 09:08 PM   #5
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I have found that fans work much better when they pull the air rather than push it across the condenser. That requires placing them on the top side vent or roof vent for maximum efficiency.

Your placement will work, just not optimally.

BTW, I place these fans on 20-30 units a year........ most are Airstreams.
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Old 08-07-2015, 09:12 PM   #6
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I have found that fans work much better when they pull the air rather than push it.......

That I accept as fact.

I read somewhere that pushing air with a fan causes a loss of about 1/3 of the cfm when compared with the same fan pulling air.
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Old 08-07-2015, 10:00 PM   #7
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Pardon my Ignorance

Isn't one side of the fan pushing air and other pulling air - just asking?
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Old 08-07-2015, 10:23 PM   #8
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Isn't one side of the fan pushing air and other pulling air - just asking?

Yes ...

There is more to push vs pull as more efficient than meets the eye. It has to do with the specific application. In this case I'm with Lew.

A potentially ridiculous case of push being more efficient is a turbo charger where the exhaust gas pushes a fan which in turn pushes combustion matter. Imagine trying to pull that ...

A questionable example of which is which, push vs pull, the central heat/air in a home. Is the fan blowing the air out to various locations, or pulling it from various locations? Or both ...
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Old 08-07-2015, 10:45 PM   #9
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Lester,
When you say you have found that the fans work much better when they pull the air rather than push it across the condenser, is that what happens when they are hung the way Airstream had installed them? Are they pulling air that way? (Like I mentioned, the 16' Sport has no top vent, it vents out the side only)
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Old 08-07-2015, 10:45 PM   #10
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Originally Posted by lewster View Post
I have found that fans work much better when they pull the air rather than push it across the condenser. That requires placing them on the top side vent or roof vent for maximum efficiency.
Keeping the fridge cool in the summer is a problem, especially when we are traveling all day. It may start out at 32 degrees in the morning but by the end of the day traveling is in the high 40's.

I am going to try to install 2 or 3 computer fans in the chimney at the top and see how this helps fridge performance.

Thanks for your helpful comment Lew.

Dan
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Old 08-07-2015, 11:04 PM   #11
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Lester,
When you say you have found that the fans work much better when they pull the air rather than push it across the condenser, is that what happens when they are hung the way Airstream had installed them? Are they pulling air that way? (Like I mentioned, the 16' Sport has no top vent, it vents out the side only)

Nope. If you really want maximum efficiency from your fridge fans and only have side vents, attach the fans to the upper vent door.

This location pulls air across the condenser to moderate it's temperature, which is the whole reason for the fans.

Oh, and BTW, it's 'LEWSTER' :-))


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Old 08-07-2015, 11:10 PM   #12
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I mounted my fans under the fins but close enough that the pull or push efficiency difference should not be an issue.

http://www.airforums.com/forums/f425...ml#post1320168

My trailer has the roof opening which is a better chimney cavity than the side ported. I also have a larger exhaust fan mounted at the opening wired to a manual switch for truly hot days. I have only turned on the upper fan twice since the pictured mod was complete. Those were 110+ days in the desert.

The pictured fans keep my reefer cold on the number 1 setting whenever its under 95.
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Old 08-07-2015, 11:57 PM   #13
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Attach to the door like this?
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Old 08-08-2015, 12:27 AM   #14
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There ya go!
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