The problem with delta T testing I see is how long it can take to stabilize the run at high deltas and high heat loads with large volumes. I'm seeing some tests taking over 90 minutes to stabilize.
So much for production testing..lol!....
I'm also seeing huge variability in the air out numbers. I think every fan draws and spits out air a little differently and any minor movement at all in the sensors gives you a different result, so while it is interesting information, I don't trust air out myself unless you had some sort of flow chamber to collect and mix the air before measuring it. This would probably be a good idea for the air in also, but I'm not changing now, at least my air in sensors are permanently fixed.
I agree there are alot of flaws in any test setup. There's really no way around it even when you try really hard to minimize it. Probably the best we can do is collect more data points to try and average some of it out and last but not least, don't worry about it and just acknowledge that it's there and take the data with a grain of salt..
Reply With Quote
Bookmarks