Fridge fans - suck or blow?

[berni109]

This question seems to have caused a little controversy recently.
My thoughts are that sucking hot air from the top of the enclosure is preferable if it's possible.

As an aside is blow job an oxymoron?

 

[Two on Tour]

We have a Carthago C-Compactline with a normal lower wall vent and a roof top cowl so no upper wall vent to place fans in.

I haven't explored the possibility of putting fans near the top as it would be impossible without removing the cowl and that's something I don't really want to do.

The discussion therefore on where to optimally place the fans in the lower vent area is interesting.

You need to position the fans so they are not blowing onto or interfering with the burner flame.
Ideally, you need to measure the temperature at the condenser pipework to control the fans coming on and going off at the optimum temperatures.

 

[bigtwin]

The discussion therefore on where to optimally place the fans in the lower vent area is interesting.

If you can place them to blow directly onto the radiating fins, ideally from below, you will get the most effective cooling.

Where the air enters the cavity and where it exhausts the cavity will sort itself out.

Ian

 

[Minxy]

If you can place them to blow directly onto the radiating fins, ideally from below, you will get the most effective cooling.

Where the air enters the cavity and where it exhausts the cavity will sort itself out.

Ian

Now then, as my Dad used to say, does that mean vertically on the vent itself or horizontally directly under the fins?

 

[Lenny HB]

You need to position the fans so they are not blowing onto or interfering with the burner flame.
Ideally, you need to measure the temperature at the condenser pipework to control the fans coming on and going off at the optimum temperatures.

Often not possible, so I work on, setting the fans to turn on when the ambient temperature is 25°, always worked well for me.
My fans are higher than the burner but that is totally enclosed anyway.

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[Lenny HB]

Now then, as my Dad used to say, does that mean vertically on the vent itself or horizontally directly under the fins?

Horizontally would be better but again not possibly in mine & couldn't mount them on the grill as the winter cover goes inside the grill.

 

[Minxy]

Awe that's cute ... Your burner cover has a little face! I want one!

 

[Vansflyer]

On our now replaced "Tec Tower" I fitted the Dometic fan in the position they specified, arrow on left. It was controlled by the thermocouple on the bottom pipe, arrow right.
It was very less than keen to cut in so I fitted a thermostat inside the void that turned the fan on above 25c. I must say it worked much better than I expected and did help keeping the fridge cool. Top fans were also fitted and a baffle made, forcing the air over the cooling fins at the top of the aperture rather than it going around the pipes. These were used a lot less than the bottom fan which was on a lot of the time.

 

[bigtwin]

Now then, as my Dad used to say, does that mean vertically on the vent itself or horizontally directly under the fins?

Ideally, horizontally below the fins but that’s unlikely to be practical. The important thing is to have airflow over the fins.

It’s pointless having the fans blowing air out of the vent if the air being drawn to the low pressure side of the fan isn’t passing over the fins (i.e. it finds a path from the lower vent to the LP side of the fan without any of that air passing over the fins).

In those circumstances it’s better to just blow air over the fins and let the LP side of the fan be replenished from wherever it can source the air (it will come from the path of least resistance).

Ian

 

[MichaelT]

From the other discussion:

From Lenny “Most cooling fans are more efficient drawing air out of a cabinet”

From Lenny “Not as efficient as pulling it out”

From Lenny “I give up, you dont understand the design of equipment cooling fans”






Ian

Why bother with all this?

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[bigtwin]

Why bother with all this?

This thread was started because folks were interested in the topic and It saved me typing a load of it out again.

Besides, the only person who got upset by it (for what reason who knows ) can’t see it anyway so can’t get upset by it as he has censored my input.

Ian

 

[Flairy]

Mine just blows from the top and this is a replacement fridge freezer.our friend replaced his fridge freezer with a 12v thetford under the same conditions his stays cooler at temperatures in the 30 s.