| a Fundemental factor in the process of heat transfer is the difference in the temperature of the mediums ( oil / air) The rate of heat transfer in any heat exchanger is proportional to this difference In an Oil to Water exchanger this difference can be as little as 10 degree fahrenheit Water 220 oil 230 In oil to air exchangers these differences is usually around 100 degree fahrenheit These type of oilcooliing can add to the complex problem allready of cooling the rotary engine.( water coolant boiling) Oil to air coolers is in my opinion a more stable system as oil boils at a temperature well above the normal operating temperatures Think that conventional oil cooling is a parallel independent cooling system and will continue to function when the liquid ( water) system fail for a reason. As a third of the heat of the rotary is cooled by the oil system It helps in my opinion if your eggs are not in one basket and the rotary will get you on the ground if the water system fails but the oil system is working.
Just my thoughts
Le Roux Sent from my iPhone Le Roux Breytenbach On 19 Oct 2023, at 21:37, Charlie England ceengland7@gmail.com <flyrotary@lancaironline.net> wrote:
Sorry for the late reply; been a bit distracted the last few days. I really don't know about the continuous thing, but that particular item was for a US-brand vehicle, and 'word on the street' about engine testing at major car mfgrs these days is that it's far more abusive than anything we could likely achieve in a/c. One test (just one of many) that's been mentioned is running for hundreds of hours, alternating between max power and max torque, stopping only for oil changes at the 'book' interval.
Charlie
Of course, dumping that oil heat load into the water means a significantly bigger water radiator would be required. How much heat ( % ) of total is normally rejected for a piston engine?
You say rated for 280HP. Is that 280HP continuous?
Finn
On 10/15/2023 4:55 PM, Charlie England ceengland7@gmail.com wrote:
> I've been interested in the idea of liquid-liquid oil coolers for a
> long time, but haven't been willing to pay the rather high prices for
> 'conventional' solutions. In recent years quite a few cars have
> started using oil/water exchangers, and I've bookmarked several that
> look like they have potential in both heat handling and adaptability.
> This one looks like it might be as easy as any to adapt, and it
> includes a filter mount, to boot. It's used on vehicles with around
> 280 HP, so it might be able to handle a 13B/Renesis' heat load (with
> larger radiator, of course). Looks like it could mount to an adapter
> made from flat aluminum plate with the exception of one port.
>
> Might have potential to eliminate a cooling duct, and get rid of the
> topside bump of the filter on the older Renesis blocks.
>
> https://www.amazon.com/dp/B0BY82QT7J
>
> Charlie
>
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