Ouestion about putting a fan in refrigerator - Page 2 - Fiberglass RV


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Old 01-05-2013, 10:45 AM   #15
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If you're interested in seeing an old, old thread from the archives that may help explain the differences between the two... and they're pictures: http://www.fiberglassrv.com/refrig-fan.php
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Old 01-05-2013, 10:53 AM   #16
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Going to add a 50cfm 80mm computer fan at the bottom and top vent outside also one inside the frig.
Thanks everyone for all the tips.
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Old 01-05-2013, 10:57 AM   #17
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Quote:
Originally Posted by Kevin K View Post
Going to add a 50cfm 80mm computer fan at the bottom and top vent outside also one inside the frig.
Thanks everyone for all the tips.
You might want to switch them separately if you boon dock, so you can optimize the power usage.
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Old 01-05-2013, 12:01 PM   #18
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Kevin I think you have made the right choose!

I have used the little cube fan inside the fridge for years - as Thomas indicated it really only moves air around but it helps! The instructions with my current one said it was best placed at the bottom of the fridge. If you get one make sure you get the one with an on off switch - one of the ones doesnt have a switch and I could never remember to pull the batteries out of it when not in use. The one with on/off switch can last me a year of camping on one set of batteries.

The big thing to remember about the inside of the fridge is - dont over fill it! If is over packed nothing will cool it down. Best to keep you none perishable items in a separate cooler. Also don't let the freezer compartment frost up. The more frost in the freezer area the poorer the fridge will run.

Two other things I have done that had a far bigger impact on better fridge performance were adding a small fan outside at the bottom of the fridge pointed upwards (leaving the bottom vent open a little bit) and wrapping the outside of the fridge in foil bubble wrap type insulation and resealing the area the fridge is enclosed - both inside the trailer and at the back. Scamp had not done a great job of that - there were a few spots inside the cabinet area that were wide open.

Putting a wireless outdoor temperature sensor inside the fridge is another great item to have. Put the readout panel outside the fridge saves having to open the door to check how well the fridge is performing. Have found it often takes in really warm weather a good hour for the fridge to recover from having opened the door.
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Old 01-05-2013, 03:51 PM   #19
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A pal of mine uses a solar powered fan very much like this (he's got it inside the fridge, not outside as illustrated):



I've been surprised at how little light it takes to power it. Of course it goes off at night, though to no real detriment of the goods in the fridge.

Francesca
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Old 01-05-2013, 03:55 PM   #20
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Originally Posted by Francesca Knowles View Post
A pal of mine uses a solar powered fan very much like this (he's got it inside the fridge, not outside as illustrated):



I've been surprised at how little light it takes to power it. Of course it goes off at night, though to no real detriment of the goods in the fridge.

Francesca

Isn't it dark inside the refrigerator?
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Old 01-05-2013, 04:02 PM   #21
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Originally Posted by Thomas G. View Post
Isn't it dark inside the refrigerator?


Hang on....I'll run and look in my house fridge...

Nope! Every time I open the door, there's a light on!

Nyuk nyuk...
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Old 01-05-2013, 06:10 PM   #22
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I know many people believe overfilling a small fridge means inefficient operation. I think this is only true if there is absolutely no circulation front to back, an almost impossible situation. We have a fully shelved fridge and keep it pretty full and have no issue what so ever. It's really hard to make it so full that air doen't naturally circulate. We continually monitor temp at the inside front of the door and have never seen a problem.

We never turn our fridge off, keeping it on even when we're home for the summer.

Our philosophy is that the temperature of the fridge only goes up for two reasons. One you leave the door open and the cool fridge air gets replaced by warm room air. This is really irrelavant because the items in the fridge before the door was opened contain a lot of 'cold' and room air does not contain a lot of hot, the thermal capacity of solid, cold items is simply greater than air.

The primary time the fridge temperature goes up is when a warm item is placed in the fridge. This will take a while to cool and may raise the air temp in the fridge but not necessarily significally change the temp of other items thru out the fridge. Of course a cooling fan will more quickly cool a hot item added to a cold refrigerator but to me this is of no consequence.

To me an internal cooling fan just takes up space. Now the external cooling fan and the addition of fridge insulation is another matter. This truly adds to the cooling efficiency.
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Old 01-06-2013, 12:47 AM   #23
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Originally Posted by honda03842 View Post
I know many people believe overfilling a small fridge means inefficient operation. .
Many of those people appear to be RV Refrigerator manufactures. Most of the manuals I have read for RV fridges all make reference to making sure you have space between items to allow for air circulation. From the Dometic manual for a 2191 on page 9 " avoid using large dishes and do not stack food or food containers too closely as this interferes with the circulation of cold air within the cabinet."

Its physics and the reason why the refrigerators fins are placed high in the fridge. Think of cold air as a liquid ....it is heavier than hot air therefore it will move downwards & displace the hot air in the lower portion of the fridge. Assuming the cold air is not trapped in the top half of the fridge due to the shelves of the fridge not having any space between items to allow it to drop.

YMMV but its been my experience that how well the the fridge cools items off evenly from top to bottom is very noticeable if I have over filled it - in particular if the middle shelf is to full it prevents good air circulation from top to bottom.
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