---------------------------------------------------------- Europa-List Digest Archive --- Total Messages Posted Sat 03/03/12: 2 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 02:53 PM - Test (Kingsley Hurst) 2. 03:41 PM - Re: Laminova heat exchanger and Evans coolant (Gilles Thesee) ________________________________ Message 1 _____________________________________ Time: 02:53:59 PM PST US Subject: Europa-List: Test From: Kingsley Hurst Do not archive Sent from my iPhone ________________________________ Message 2 _____________________________________ Time: 03:41:32 PM PST US From: Gilles Thesee Subject: Re: Europa-List: Laminova heat exchanger and Evans coolant Frans Veldman a crit : > Furthermore the engine can safely be operated at a higher > temperature, which is good for performance. (This is not so obvious, but > think about it this way: we ignite the fuel to get heat. Heat is what > drives our engines. All heat taken away from the engine is a loss of > energy. We should not cool any more than necessary to keep the engine > from melting.) Frans and all, Please pardon me for jumping in. I would like to point out that running an engine hotter implies *greater* heat rejection, all other things being equal, since heat rejection is a direct funtion of the the temperature difference between metal and coolant. Also in a liquid cooled engine, some degree of local boiling (nucleate boiling) *does* occur. It is this local boiling that insures protection from hot spot, due to boiling removing enormously more heat than just heating liquid. Naturally we are speaking of an adequate flow of coolant which removes the bubbles and let them collapse in the general flow. Several thorough NACA reports have been published on the subject ((TN-1498, TN-2049). Some info (mostly in French I'm afraid) at http://contrails.free.fr/engine_liquide_refroid.php. Bottom line, no need to be afraid of some internal boiling, and everybody will agree that 50/50 coolant is better, and water is best (but it can freeze). Best regards, -- Gilles http://contrails.free.fr ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message europa-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Europa-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/europa-list Browse Digests http://www.matronics.com/digest/europa-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.