I know. And - you get a "free" 90 degree change in air flow direction, sometimes a project-saving feature.Yes, centrifugal type fans can be more efficient (and quieter) at moving air where there's a low pressure drop.
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I know. And - you get a "free" 90 degree change in air flow direction, sometimes a project-saving feature.Yes, centrifugal type fans can be more efficient (and quieter) at moving air where there's a low pressure drop.
In that instance AC probably means "Actually Cheapo", or more likely "Amazingly Cheap".So, in this case what does AC actually mean? We know it's not an air CONDITIONER, it would just be a fan. But what sort of fan? And what does AC stand for? Acceptable Cretin? As in Fool and his money?
Here is part of the ad for the $89 rip-off AC unit:AC probably means "Actually Cheapo", or more likely "Amazingly Cheap".
It isn't evaporation, it's conduction. Or convection, depending on how semantically picky you want to be.AH! Evaporative cooling.
Not so for the typical swamp cooler on the roof or in a window of a house (and likely for the "AC" unit in discussion).It isn't evaporation, it's conduction.
Now who's being picky ? ? ?depending on how semantically picky you want to be.
What about human sweat? That's a temperature of 98.6˚F. What about when the air temperature is 90˚ and you're sweating? Doesn't sweating and the evaporation of said sweat cool you off? Can't say water temperature has all to do with it. Water temperature may actually have very little to do with it. It's the evaporative process that is responsible for the cooling effect.When you blow warm air across cold water, heat is transferred to the water. It isn't evaporative cooling, it's just cooling.
Swamp coolers are hardly available in places like Boston whereas there is high demand for them in Phoenix. When humidity is up swampers are less effective.But if you’re not in the desert, I disagree with your statements. 100° in Boston feels a lot hotter than 100° in Phoenix. It’s not the heat, it’s the humidity.
Sometimes, it's just what we do.Wasn't this thread about putting fans and batteries on top of a 2 yr old's head? How is it devolving into an argument about swamp cooling and air conditioning; and other definitions of "AC"?
Thanks for pointing that out. Yes, it has wandered. Thanks for the morning laugh.PanMan has a very good point. The thread has wandered so far away that the original query is totally abandoned. And nothing useful has been mentioned.
I HAVE had a few concussions from things other people did. Some intentionally delivered and some accidentally happening. Mostly in situations where one would not normally be wearing any protection. And most of them when I was an adult, not a kid. There are some rather nasty folks around, and a few rather careless ones as well.When I grew up - I never had a helmet. Rode bikes, mini-bikes, skateboards (no elbow pads either), motorcycles, go-carts, all kinds of powered stuff. Never hit my head once. However, there's still no apparent explanation for my brain-damage.
by Jake Hertz