Engine bay filter

[Rotary-Motion]

with the car experiment was gonna leave it outside then drive with probe out window to catch windchill

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so say something (filter) is at 5c (just enough  to drive on with bio) and not get fats/gelling or whatever the terminolgy is, the wind / speed your mph will lower that 5c to say 0c and create solidifying/gelling bio ?

Do you not believe scientific fact ?

  Clearly the light is not on ! 

hold on hold on lets clear something up here!

science and you are telling me windchill doesnt chill anything? so if something is 5c (ambient temp been left outside on floor) and i take it for a drive and stick it out the window at 50 mph it stays 5c?

[Tony]

Yep that sounds right.  The only way it could get lower than ambient is if there is any surface liquid to take heat away as evaporation.  My filter is not wet, so shouldn't get below ambient no matter how much air you push past it

On a side note, here's some pics of my one way valve fitted and the 10" filter housing:





Bits used:

http://www.ebay.co.uk/itm/110857428209
http://www.ebay.co.uk/itm/300547234990
+ 2x 1/2" to 1/4" brass bushes

So far so good

[Tony]

My understanding is that most car diesel filters are 5-8 micron or so?  So perhaps my 1u filter elements are a little bit too fine for this application - I've ordered a few five micron elements.

[1958steveflying]

with the car experiment was gonna leave it outside then drive with probe out window to catch windchill

==========================================================

so say something (filter) is at 5c (just enough  to drive on with bio) and not get fats/gelling or whatever the terminolgy is, the wind / speed your mph will lower that 5c to say 0c and create solidifying/gelling bio ?

Do you not believe scientific fact ?

  Clearly the light is not on ! 

hold on hold on lets clear something up here!

science and you are telling me windchill doesnt chill anything?

Cant see that I have said that at any point ! What I have said is wind chill does not affect inanimate objects. Take a read of the Wiki I linked that explains it in detail.

[1958steveflying]

My understanding is that most car diesel filters are 5-8 micron or so?  So perhaps my 1u filter elements are a little bit too fine for this application - I've ordered a few five micron elements.

Don't forget that the 10 inch elements are at best around 60% efficient Tony

[greasemonkey]

I've never quite got my head around this, but basically, if your are standing on the top of a hill, the wind chill will make you colder, because you are warmer than the ambient temperature in the first place.
The stones on the ground will not be getting any colder than ambient. If you put a blanket or sheet on them, so the wind is not touching them, then they remain the same temperature.

[Rotary-Motion]

what about the stones out of the wind down the bottom of the hill (enter smiley  )

a car filter say at 5c stood still will go to 0c or less at 50 mph, i guess thats why we have car/van radiators, stood still they use 12v fans

although im only guessing

[Julian]

I'd go along with the theory that you can't cool something to lower that ambient temperature using a stream of ambient air ... in which case how does and intercooler work?

[Rotary-Motion]

and what if you sent that ambient object travelling at 100mph through the ambient air, would it stay ambient?

although that brings into the equation good ol friction. 

the ambient thing i can just understand, wind chill on my van happens driving along i have the temperature relay on the dash stood still i get near 90c travelling along it goes down to 72c, stop at the traffic lights it creeps back to 89/90c, so im seeing a windchill factor, but its useing ambient air on a hotter surface (heat exchanger/temp probe)

also like to mention my HE is tucked away under the bonnet lid, not in the flow of front air coming in, but it cools when driving, meaning the whole engine bay gets filled with cooling air travelling through the rad, so nowhere is safe

[Keef]

I'd go along with the theory that you can't cool something to lower that ambient temperature using a stream of ambient air ... in which case how does and intercooler work?

The only way it could get lower than ambient is if there is any surface liquid to take heat away as evaporation.  My filter is not wet, so shouldn't get below ambient no matter how much air you push past it

Maybe you are using the technique that Tony mentions using the moisture in the air.

Also you are usually starting with air that is taken from inside the engine bay so is probably a tad above ambient to start with and sometimes even mixed with a bit of exhaust gas thanks to egr etc

wind chill on my van happens driving along i have the temperature relay on the dash stood still i get near 90c travelling along it goes down to 72c, stop at the traffic lights it creeps back to 89/90c, so im seeing a windchill factor, but its useing ambient air on a hotter surface (heat exchanger/temp probe)

also like to mention my HE is tucked away under the bonnet lid, not in the flow of front air coming in, but it cools when driving, meaning the whole engine bay gets filled with cooling air travelling through the rad, so nowhere is safe

You are seeing windchill but it would never chill the probe to below ambient

[therecklessengineer]

I'd go along with the theory that you can't cool something to lower that ambient temperature using a stream of ambient air ... in which case how does and intercooler work?

Because the compressed air from the compressor end of your turbocharger is coming out hot. (Compress a gas and it gets hot)

Cooled back to ambient (or near enough) by an intercooler makes it more dense = more O2 = more fuel = bigger bang.

[Julian]

I'd go along with the theory that you can't cool something to lower that ambient temperature using a stream of ambient air ... in which case how does and intercooler work?

Because the compressed air from the compressor end of your turbocharger is coming out hot. (Compress a gas and it gets hot)

Cooled back to ambient (or near enough) by an intercooler makes it more dense = more O2 = more fuel = bigger bang.

Feeling pretty stupid now!

Despite owing several turboed cars, I've never traced out the air path ... I just assumed that the intercooler was before the turbo, but what you say makes complete sense ... moral here ... think before you type, Julian.

Thanks for putting me straight!

[Rossey]

Wow

What did I start lol

[julianf]

Im pretty sure that the the wind chill on moist objects is due to the energy required for the state change.  Latent heat, and all that?  Same as those hand warmers with the snap disc.

Hence, no liquid to state change means no wind chill.


(same reason that solvents feel cold when they evaporate off your hand in a still environment - they're taking up energy to undergo the state change)

[Head Womble]

An intercooler doesn't work on wind chill,
heat dissipation is what makes an intercooler work,
just the same as the radiator it heats the air that moves across the hot surface thus reducing the temperature of that surface.

With an intercooler you have two stages of heat dissipation ,
the hot gasses withing the intercooler transfer heat into the the intercooler it's self, which then transfers it's heat into the air around it.

You can increase the efficiency if this by spraying water at the intercooler and using wind chill (evaporation) as well.