Would not the process basically focus on time to cool a given volume using a standardized cooling process that can be repeated. I'm leaning more towards a more consistent heat source, possibly an electric heating element, much easier to measure how much heat is being dissipated that way. I don't agree that using an engine is the best way to do this. Testing will focus on the ability of the coolant system to carry heat away from an engine. But I'd warn everyone joining in that we also already know that engines run hotter on Evans Waterless Coolant than on conventional coolant. especially if we can turn the outcome into a wager with the winnings going to the Club charity. How much is a couple of engines' worth? I might put in my share. The downside of that of course is the cost of the proprietary product. That could include using the same materials as in the block and radiator and getting the flow rates as similar as possible. The logical end point of that is doing the experiments on a real engine. The more you can make your rig like a real Seven's engine the better. So I'd encourage you to concentrate on experiments that don't spend too much time on that, although you'll probably show it along the way. We know that the thermal capacity of Evans Waterless Coolant is less than that of conventional coolant. It would be great to see some experiments. (At 100☌ relative heat transfer factor for ethylene glycol is 0.25 compared with 0.21 for propylene glycol, specific heat of 100% ethylene glycol is 2.8kJ/kg/K compared with 3.6kJ/kg/K for 50/50 mix and 4.2kJ/kg/K for pure water). This issue has also been reported in fire suppression systems using this plastic and propylene glycol as the antifreeze in the water/foam mix, too.įrom a heat transfer perspective, pure propylene glycol at 100☌ will need about 53% higher flow rate than 50/50 ethylene glycol / water mix that in turn needs about 17% higher flow rate than pure water to achieve the same cooling effect. I have direct experience of a 25mm thick CPVC manifold on a datacentre chiller system using propylene glycol that cracked from the inside out in less than 2 years, causing a 10m high fountain of coolant and the need for a $1m replacement of the whole system due to the uncertainty of it's integrity. One issue to be aware of in using propylene glycol in high concentrations is that it can have a negative affect on certain plastics.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |