WWDiesel wrote:
Humidity can have a big impact on total air flow.
In the example above, taking measurements in Colorado and at sea level in say Florida, the air in CO would be much dryer verses the 90%+ humid air in FL at sea level.
I am not sure that the MAF sensor can compensate electronically for humidity or the relative dew point of the incoming air.
As an old large steam boiler/turbine operator, I know full well from experience how much ambient air temperature, humidity, and barometric pressure can have on the performance of a 10 story boiler making steam. And we had some very sophisticated instruments for measuring incoming air flow and all these other parameters of the air being pumped into the boiler by huge fans. Depending on ambient conditions, we could pull much more load with the turbine/generator if incoming air conditions were ideal, low humidity and mild temperatures. Nice dense dry air!
I don't suspect an engine performance to be a whole lot different...
I do turbine controls for work, steam, compressors, gas turbines etc. Ambient conditions(and fuel quality, or steam properties), make a huge difference. DLE (dry low emissions) gas turbines are so finely tuned that 20 degrees of difference in a temperature swing from morning to midday can make the different between the engine starting or not starting. Seasonal mapping is a big deal at many sites where they might have to map the engine 3 times are year to keep it running.
As such its important to understand why the numbers can vary so much for us. Basically we will have such few datapoints that it will be hard to really understand what is "good" or "bad" since the actual curve is a 3D curve that has become 4D since we have a time/age/use factor as well.
i could repeat the same test at 0F and likely have very different numbers, they would still be the same sort of engine health that I have now, but just different flow because the air is so cold and dense.
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