(26-10-2014, 05:18 PM)r3k1355 Wrote: It's a waste of time if your intercooler gets so f*cking hot that pissing some water on it will make any difference then you've got bigger problems to think about.

Subaru stuck them on some Impreza's as abit of a gimmick, but it's nothing that would ever be useful on a road car.

(27-10-2014, 10:36 AM)SRowell Wrote: its not the same as double glazing... double glazing traps a layer of air which stops heat transfer via conduction.

(27-10-2014, 10:31 AM)r3k1355 Wrote: In that video about spraying the intercooler black he talks about convection so much as he then goes on tell us about heat transfer. It's actually conductive heat transfer that transfers the heat.

Convection is hot air rising and cold air sinks. Electrical convection heater heats air, that hot air rises and spreads across the ceiling and as it cools sinks down the walls to pass back along the floor to the heater. There is very little convection under a bonnet the draught is forced.

A layer of paint is an insulator. Just like a second pane of glass in double glazing.
Hot air > aluminium oxide > aluminium > aluminium oxide > cooling air.
Hot air > aluminium oxide > aluminium > aluminium oxide > paint > cooling air.

Aluminium 210 W/(m.K)
Aluminium oxide 30 W/(m.K)
Paint (black or white) 0.17 W/(m.K)
Paint (high metal silver etc) 0.19 W/(m.K)

So 0.05mm of black paint is like an extra crusty 8.8mm thick layer of bare aluminium oxide. If you saw that on an IC you would be be reaching for the wet and dry. Even anodising an IC is bad news as that thickens the natural oxide layer which is an insulator compared to the aluminium sheet.

http://www.engineeringtoolbox.com/th...ity-d_429.html
http://www.thefreelibrary.com/Specia...y.-a0228354685

Surface finish is also critical to the thermal transfer of heat from induction air to the alloy and to the cooling air. A nice smooth shiny finish is poor, needs a bit of texture, that's the function of the fins between the plates.

(27-10-2014, 11:50 AM)toseland Wrote:

(27-10-2014, 10:36 AM)SRowell Wrote: its not the same as double glazing... double glazing traps a layer of air which stops heat transfer via conduction.

thats the problem... you're WRONG sam lol

conduction = solids only
Convection = liquids and gases

seeing as air is comprised of gases. it would be a little difficult to conduct the heat through it


and actually most double glazing systems have a partial vacuum in between the layers of glass..

(27-10-2014, 01:29 PM)SRowell Wrote:

(27-10-2014, 11:50 AM)toseland Wrote:

(27-10-2014, 10:36 AM)SRowell Wrote: its not the same as double glazing... double glazing traps a layer of air which stops heat transfer via conduction.

thats the problem... you're WRONG sam lol

conduction = solids only
Convection = liquids and gases

seeing as air is comprised of gases. it would be a little difficult to conduct the heat through it


and actually most double glazing systems have a partial vacuum in between the layers of glass..

what? so youre agreeing with me? I said that black paint isnt like double glazing. In the case of black paint its another layer but all conductive as its all solid. In double glazing its solid, gas (or not solid at least), solid. because of the non-solid layer conduction doesnt happen. So how am i wrong? I merely was pointing out how the double glazing 'extra layer' example was BS as it has a vacuum/ air in the middle which paint on an intercooler does not!

(27-10-2014, 01:34 PM)r3k1355 Wrote: I'm f*cking lost as well.

I think they're both not very useful on a road car and sticking a better FMIC is will give better results than painting your IC black or spraying it down with water.

Quote:double glazing traps a layer of air which stops heat transfer via conduction.

(27-10-2014, 03:08 PM)Matt-Rallye Wrote: Simple way to explain this..

Blow on the back of your hand.. does it feel cooler? great.

Now lick the back of your hand and then blow on that.. which one was cooler?

Oh it was the 2nd one? shock!