Wind chill really doesn't make a difference?

[Quattro Pete]

Originally Posted By: MolaKule
Quote:
Wind chill is also due to the fact that our skin contains moisture. Last time I checked, engine blocks don't sweat.


And last time I looked at my engine or transmission, it didn't have any goose bumps.

But a turbo can turn red.

 

[UNC017]

Originally Posted By: MolaKule
Quote:
Wind chill is also due to the fact that our skin contains moisture. Last time I checked, engine blocks don't sweat.


And last time I looked at my engine or transmission, it didn't have any goose bumps.

Sand casting surface finish looks a *little* like goose bumps...

 

[UNC017]

Originally Posted By: rjundi
If I park my Acura MDX in a non insulated barn that fits 9 vehicles the vehicle stays warmer inside and the engine temp too at restart.

Outside in the howling winds the car is not only colder in the interior but engine is not as warm if at all. There is wind (chill) is cooling the engine and interior quicker outside.

The temperature inside and out of barn is within a few degrees of each other.



Its all about HOW LONG it takes everything to come into thermal equilibrium. The ONLY thing wind (forced convection) does to an inanimate, inert, non-operational engine is make it come into thermal equilibrium with the surrounding air FASTER. If you left your car in the barn LONG enough and the temperature inside the barn and outside in the wind were truly equal and didn't change over that longer period of time, it would eventually get exactly as cold as it gets outside in the wind. No colder. No less cold.

 

[Cujet]

Well, when you consider how an Lycoming Piston aircraft engine is cooled, you realize it's simply airflow and heat transfer rate.

The larger the Delta T (difference in temperature between the engine and the airflow) the more rapid the heat transfer. AND, the more rapid the airflow, the more rapid the heat transfer. Both items play a role.

So much so, that during cold weather operations, many aircraft operators reduce the size of the cooling air inlets, to reduce airflow.

Put another way, "wind chill" is simply a more rapid heat transfer rate.