New Concept of Engine Cooling System (Newcool)

The targets of this study are:

• cost reduction of all engine cooling components,
• gasoline consumption reduction,
• weight reduction of the engine cooling system,
• improvement of the thermal comfort in passenger compartment.

To reach these targets, Valeo Engine Cooling is developing a new concept in engine cooling. This basic concept consists of adding a small electric water pump, 30 to 60W, instead of the conventional engine driven water pump of up to 1 to 2 KW. This small electric water pump provides a flow rate of approximately 1000L/h.

With a liquid flow rate of 1000L/h, this conceptual system can ensure engine cooling at speeds up to 120 Km/h under convective cooling in normal conditions. That is to say, it can supply 95% of the flow requirements (see appendix ) of a vehicle at the same performance level as a conventional cooling system. The remaining 5% of the requirements, at vehicle speeds greater than 120 Km/h, and hill climbing has been resolved by the use of nucleate boiling in the cylinder head. Again, this concept works in 95% of the cases by forced liquid convection heat exchange like conventional cooling system, and only 5% by nucleate boiling heat exchange.