Question about watercooled equipment/chillers

[queequeg152]

Yes, but energy must always go somewhere. You can "hide" energy by evaporating water inside a room. The temperature drops but the room contains the same amount of energy. Condensing water out of a room (or a hurricane) releases heat energy. This released energy is what powers hurricanes.

-r2k

yea i understand this, but i assumed there would be more energy escaping the room in the form of electromagnetism and noise.

turns out though that those losses ... in terms of watts per hour are so small that they are just ignored entirely.

this suprised me because electronic ballasts and especially mag ballsts produce a noticable amount of electromagnetic interferance.... PSC motors too and brushed universal motors produce a shit load of random noise.

i freely admit to know knowing much about electronics... radio, electromagnetism etc. i study the more plebeian tangible areas of engineering.

 

[Subcooled]

Chiller water flow rates for 10 degree delta T
Evaporator 2.4 GPM
Condenser 3.0 GPM

 

[r2k]

yea i understand this, but i assumed there would be more energy escaping the room in the form of electromagnetism and noise.

turns out though that those losses ... in terms of watts per hour are so small that they are just ignored entirely.

Noise carries almost no power. It doesn't take much sound energy to produce a really loud sound to our ears, but it just doesn't matter much in the relative scheme of power transfer.

Electromagnetism doesn't transfer much power unless it moves something physical, like a fan blade. The definition of work (moving energy) is to push against something and move it over a distance. If there is no physical movement, there is no work occurring.

this surprised me because electronic ballasts and especially mag ballsts produce a noticable amount of electromagnetic interference.... PSC motors too and brushed universal motors produce a shit load of random noise.

Noise yes, but no energy transfer.

The big secret of all this stuff is that 99.99% of all forms of energy will eventually end up as heat, usually sooner than later. Photons get bounced around until they are absorbed in about 20 nanoseconds. Fans move air and that does work (because you are moving mass) but eventually all the moving air molecules bump into each other and bounce off other molecules and turn all that motion into heat. It's just the way life is.


-r2k

 

[queequeg152]

what about powerful radars and ham radios and shit like that? radio stations?

these things consume huge amounts of power.

from freshman physics i believe we discussed work done by electric fields being a function of voltage and distance or something like this.

this was when we were discussing capacitors and shit. it was mentioned that antenna can be thought of(i forget why) as a capacitor of some sorts.

 

[queequeg152]

lol i got a c in physics 2. im shit at it... physics 1 was fine... all Newtonian junk, but physics two was all magnetic flux this and that and it blew dicks.

 

[r2k]

what about powerful radars and ham radios and shit like that? radio stations?

these things consume huge amounts of power.

Yeah, there is always something that makes an extreme case.

Yes, radars and ham radios are designed to dump lots of power into a radio frequency transmission. Then again, they burn at least 2x more power on their input as they radiate into the sky. If you radiate 100 watts, the equipment burns another 100 watts (or more) just to get you that output.

Motors, and ballasts are fundamentally different in that they are not designed to radiate electromagnetic energy. They don't have efficient antennas that can couple lots of power into the radiated spectrum. For the most part, they aren't throwing radiated power into the air when compared to their input power. Most all of that power ends up as heat.

If you want to get a little bit more abstract, you can also consider a radar or ham radio just like you do an HPS bulb or array of LEDs. All of these devices generate electromagentic waves that transfer power. The HPS and LED output just happens to have a much higher frequency output than a radar or ham radio. I think ham radios can have wavelengths anywhere from about a foot (900 MHz) to about 30 meters (10 MHz). Visible light from an HPS bulb has wavelengths measured in angstroms (10e-10 meters). In the end, that RF energy from a radar or HPS usually gets absorbed by something and turns into heat. It all ends up as heat.

-r2k