Correct Air Flow on 3 way fridge?
Submitted: Wednesday, Mar 09, 2005 at 09:39
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Member - Craig M (NSW)
Hi,
Just wondering what the corresct direction of air flow would be on the back of a portable 3 way fridge?
Details:
3 way fridge mounted in the back of a van.
I have 2 computer fans mounted in a small frame that can be placed either on the top of the rear vents or on the bottom.
Question?
Would it be better to have the fans on top sucking the hot air out?
Or on top blowing cooler air into the vents?
Or on the bottom either blowing or sucking?
So it comes down to whether its better to blow or suck?
Cheers
Reply By: Keith_A (Qld) - Wednesday, Mar 09, 2005 at 10:34
Wednesday, Mar 09, 2005 at 10:34
Hi Craig - Both methods will significantly improve the operation of your unit.
If the fan is on top, AND the air it sucks must go throught the cooling fins,
there may be a slight gain in efficency over the bottom install. eg the cyclone effect (you are removing the hot air making room for more to enter at the bottom.).
Some install notes suggest using baffles between the outside van wall and the fins to ensure the air must pass through the fins (rather than bypass them via air gaps).
I used a thermostat from an electronics store (Jaycar). Screwed to the exhaust vent of the fridge, it is normally OPEN. When the temp reaches 50 deg, it closes thus completing the 12V circuit and the fans come on. The thermostats come in 50 deg; 70 deg and 90 deg (I think). Take care though as they also come in normally open and normally closed versions. With only 1 fan, ice formed in the freezer compartment in 3 hrs. (5pm Feb 2005 -
Brisbane).
(In addition, a slower fan inside the fridge may double the efficiency - fan forced.)
Regards...........
AnswerID:
101708