[herby08]

Hi all
I am in the process of building my own water cooler ( chiller) with a 120mm radiator and a 120mm fan, now what is the most effectiv way to let the fan run ether blowing in the radiator or sucking out?
does anybody have experience with this??
thanks
walt

[underthetire]

Well, i can tell you that all the chillers on our machines suck air through the condenser. Easier to mount a filter that way as well.

[neilw20]

Sucking is more efficient, and that's the way they have built cars for an awful long time, with good reason.
Blowing causes lots of turbulence and stuff up the laminar flow on the fan blades.
If the blades, blowing are a long way from the heat exchanger, it probably has much less detrimental effect.

[herby08]

Hi
my thinking was that if it sucks air through the radiator the cooling effect is not as high because if the airtemperature from the surounding air is for instance allready 70 degree this would go through the radiator and would be then heated up even more on the other hand if the fan blows then he generates allready cool air what then cools much faster the radiator temperature I am realy not sure.
maybe I should test it and see what the results are.
thanks for the respond
greetings
walt

Well, i can tell you that all the chillers on our machines suck air through the condenser. Easier to mount a filter that way as well.

[Exsecratio]

Hiya Walt,

It's quite complex in the reasoning but flow dynamics and thermal efficiency suggests sucking air through the cooling element as the other guys have said.

fan blows then he generates allready cool air

Suck or blow you can only reach the same as ambient temperature unless you use refrigerant gasses and compressors.

best wishes

Dave

[herby08]

Hi dave
I did a practic test
1. fan sucking the air thru the radiator temperature after 10 min running from 25 C water temperature also ambient temperatur down to 23.5C
2. blowing the air thru the radiator temperature after 10 min running also 25C ambient temperature and water temperatur down to 22C pretty much holding on both over 1 hour and running the laser at engraving with thwe same power setting and speed
looks to me that the blowing version is more effective in my case.
greetings
walt

Hiya Walt,

It's quite complex in the reasoning but flow dynamics and thermal efficiency suggests sucking air through the cooling element as the other guys have said.



Suck or blow you can only reach the same as ambient temperature unless you use refrigerant gasses and compressors.

best wishes

Dave