redi jedi
Well-Known Member
Yes..take that fucker apart
Cooling air from pump....
- Thread starter William1976
- Start date
Vumar
Well-Known Member
Provide a detailed explanation please? Or a link that has factual information to back up your conclusions. I see your confidence but can still smell the bullshit. = (
ttystikk
Well-Known Member
Because air is a gas, it gets compressed- and heated- as it's pumped. Water is an incompressible fluid, so pumping it does not heat it to nearly the same extent.
ttystikk
Well-Known Member
It both raises pressure beneath and reduces pressure above the airfoil, just like the crude wing it is. This is the mechanism of physics by which it actually imparts energy to the air to move it.
redi jedi
Well-Known Member
It doesnt get compressed enough to heat up...waving your hand through the air is slightly compressing the air directly in front of your hand but it doesnt get hot...does it
whitebb2727
Well-Known Member
Word.
Oh and the egine remark is funny. An engine is a air pump. I was looking through airframe and powerplant book the other day. The powerplant book has gas, diesel, and jet engines in it. It speaks of the combustion engine as an air pump.
redi jedi
Well-Known Member
Exactly...so what position are the valves in during the compression strokeÉ
redi jedi
Well-Known Member
Go look at any fan in your house and tell tell me if the blades have an aerofoilÉ
ttystikk
Well-Known Member
@redi jedi this is an excellent example I can use to explain;
A racing engine has a ten to one compression ratio, correct? It's compressing air, yes? Boyle's (I think it's his name) gas law says that anytime a gas is compressed, it's heated by a predictable amount.
Waving a hand in front of your face isn't composing it much, so the heating effect is minimal. In the other hand, engines and superchargers comes air a great deal, creating much more heat in the process. It's this heat, in fact, that an intercooler is designed to dissipate.
I hope that helps.
ttystikk
Well-Known Member
Every blade IS an airfoil. Maybe not one that belongs on the Concorde, but it's a crude rotary airfoil that fits the definition just fine. In water, its counterpart is a screw or prop.
redi jedi
Well-Known Member
You dont get it....the engine makes compression because the piston is moving into a finite space (the intake and exhaust valves are closed)...if those valves were open..theres no compression...like an air pump
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redi jedi
Well-Known Member
NO its not...a fan moves air like a propeller moves water..which is a screw..not an aerofoil
ttystikk
Well-Known Member
Then I guess we're stuck on a difference of definitions. No worries.
ttystikk
Well-Known Member
Ah but this is why it's the perfect example! The fact that it CAN compress the air is exactly why it's a pump. Doing so happens to heat air, because it's a gas.
Water, by way of stark contrast, is incompressible. Stick much of that in the motor and it will knock the heads off!
redi jedi
Well-Known Member
Blades(fan blade..propeller blade...any blade) are symmetrical...aerofoils are not
firsttimeARE
Well-Known Member
So my air pump that uses a piston isn't compressing anything?
Anyone have an average idea of how many BTUs I would need to comfortably cool a grow room thats 4x8 with 2,000 watts of HID (air cooled lights w/chiller for rdwc)? Assuming temperature outside is only 80-85 degrees. I need a portable A/C but don't have experience with brands or design types.
@firsttimeARE , @ttystikk , @dbkick , @jijiandfarmgang - What're you guys running for lights, AC, and chillers?
4000btu per 1k. get a 12-14kbtu
