They have cooling fluids, simply refered to as "water".
Wait a minute, while I am typing I just found an interesting site. #
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www.f1.com.my]
There it says:
Heat-TransferHeat from combustion in the engine is transferred to cooling fluids, which are constantly pumped around the car. These fluids then flow to the radiators where the heat is removed by airflow, before returning to the engine to do the job all over again. The amount of cooling is affected both by the area of the radiators and the amount of air flowing over them. The aim of the radiators is to obtain the most efficient cooling possible. To maximise the cooling effect, the front of the radiator consists of a concentration of tiny air fins and liquid tubes, which increases the surface area used for cooling to much more than the frontal area seen by the airflow.
[/b]Cooling systems[/b]
Cars have two fluids that require cooling oil, water and have a radiator set-up for each. But as most race teams use radiators from their engine suppliers, there is little they can do about their design. And, with the cooling fluids pumped through at a rate specified by the engine company, all the teams can do here is concentrate on obtaining the best airflow through to the radiator which is achievable through duct design. The best position for a duct is in the side pods either side of the engine, which is where the radiators are positioned. Because Formula 1 cars rely on the airflow caused by their own motion for cooling, they do not have cooling fans When the car is not moving, however, the teams use small fans attached to bags of dry ice which are fitted to the front of the side pods. These fans can often be seen in action on the starting grid in order to maintain the optimum working temperature of the engine while the car is stationary.
In travelling through the duct, the air will pass through five areas. The first is the inlet, which is designed to allow just the right amount of air to enter the duct. They have to be side mounted due to the positioning of the radiators, and with a low centre of gravity required, the lower to the floor these heavy items are, the better the car will handle.
The air which has entered the duct is then expanded in a 'diffuser' which increases in cross sectional area, and is steered in the direction of the radiator. A splitter is used in this section to bleed off the energy flow that develops on the car body ahead of the inlet (the boundary layer) and grows as the air travels along the surface. The diffuser must also be designed so that very little boundary layer develops inside, as this will reduce the cooling potential at the edges of the radiator. Once the high energy flow reaches the radiator, the airflow undergoes the heat exchange, after which it is accelerated in a 'nozzle' which increases in area before returning the air to the airstream at the duct exit.
The positioning and size of the duct exit determines how much cooling air gets through the side pods, and many teams have 'sideouts' of adjustable size. Once again, the type of track determines how big these need to be, as a circuit with slower average speeds such as Monaco will not get as much cooling air accelerated into the side pods as a high speed circuit like Monza.
Internal aerodynamics is one of the most important and overlooked aspects of racing car design. If the team doesn't put its engine in as kind an environment as possible, its chances of lasting the race are much reduced.
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They offer lots of other technical data that is very interesting.
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