Isn't he bald (and fat and a cunt)?gavinmac wrote:Does ricecakes not know that hair dryers are actually hot?
Electric fan, very cold, very quiet for sale
pew, pew, pew, pew!
^ Plus the fan increases the velocity of the air so its kinetic energy is greater. As the air molecules rub against each other the kinetic energy is converted via friction to thermal energy heating the air. A typical fan consumes about 50 Watts so having 20 fans running would be similar to having a 1-bar electric heater on in the room supposing it all took place in a closed system.jackrossi wrote:Regardless of the fact that a Ricecakes's heckle was unnecessary I must say that fans don't cool anything.
Because of the laws of thermodynamics.
The reason why we perceive fast moving air as cool is because the air around us is usually below our natural body temperature (roughly 36c) if you see yourself through a thermal camera you will see that we heat the air around us to almost our body temperature assuming a room temperature below 36c the closer to our skin the more hot the air will be. If the air around us stays still we radiate thermal energy pretty much like a candle, and the heat exchange with the surrounding air is slow, however if the hotter air around us is blown away by room temperature air the heat exchange increases (because entropy, 2nd law of thermodynamics).
So the fan actually only makes us perceive the room temperature to be colder when actually the room temperature is very so slightly (negligible) increased due to our body heat being released in the system faster.
The only way a fan can actually cool something is indirectly trough evaporation, for example when we are wet fast moving air feels sensibly colder. When eater evaporates it goes to an higher energy state so it is an endothermic process which needs to absorb energy, in this case thermal energy from the surrounding area.
Why does the fan cause the air to evaporate?
The entropy rule still applies but in this case it's not because of heat but because of the humidity gradient in the area. Practically if a part of a system (room) is more humid (wet) than another it will naturally try to balance the system the fan just speeds up the process (which being an endothermic process it cools the surrounding).
In a sealed room with uniform humidity a fan running overtime will not only not reduce the temperature but it will actually very slightly increase it because of the beat released by the copper coils in the electric motor.
P.s. yes I am bored i got dragged to the countryside for the national holiday.
Doesn't it depend on the efficiency of the fan and size/speed of the blades?
Do dirty blades and covers make much difference?
Do dirty blades and covers make much difference?
pew, pew, pew, pew!
An efficient fan is one that converts the highest amount of the input electrical energy into the kinetic energy of the air blown out the front of the fan. Dirty blades and covers reduce the airflow so energy is wasted as extra thermal energy in the motor and the moving parts of the fan plus extra sound energy but as cleaning a fan is a messy business get a responsible 'other person' to do it.
The cheap fans I've seen tend to be noisier and the motor runs hotter. I bought Hatari fans as they only cost a little more than the cheapo ones and they are both quiet and efficient although any 50 Watt fan run on full power for 24hrs only uses about 1KWHr which as we all know should cost you about 800 Riel.
The cheap fans I've seen tend to be noisier and the motor runs hotter. I bought Hatari fans as they only cost a little more than the cheapo ones and they are both quiet and efficient although any 50 Watt fan run on full power for 24hrs only uses about 1KWHr which as we all know should cost you about 800 Riel.
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Bullshit. Prove it with the math.jackrossi wrote:Regardless of the fact that a Ricecakes's heckle was unnecessary I must say that fans don't cool anything.
Because of the laws of thermodynamics.
The reason why we perceive fast moving air as cool is because the air around us is usually below our natural body temperature (roughly 36c) if you see yourself through a thermal camera you will see that we heat the air around us to almost our body temperature assuming a room temperature below 36c the closer to our skin the more hot the air will be. If the air around us stays still we radiate thermal energy pretty much like a candle, and the heat exchange with the surrounding air is slow, however if the hotter air around us is blown away by room temperature air the heat exchange increases (because entropy, 2nd law of thermodynamics).
So the fan actually only makes us perceive the room temperature to be colder when actually the room temperature is very so slightly (negligible) increased due to our body heat being released in the system faster.
The only way a fan can actually cool something is indirectly trough evaporation, for example when we are wet fast moving air feels sensibly colder. When eater evaporates it goes to an higher energy state so it is an endothermic process which needs to absorb energy, in this case thermal energy from the surrounding area.
Why does the fan cause the air to evaporate?
The entropy rule still applies but in this case it's not because of heat but because of the humidity gradient in the area. Practically if a part of a system (room) is more humid (wet) than another it will naturally try to balance the system the fan just speeds up the process (which being an endothermic process it cools the surrounding).
In a sealed room with uniform humidity a fan running overtime will not only not reduce the temperature but it will actually very slightly increase it because of the beat released by the copper coils in the electric motor.
P.s. yes I am bored i got dragged to the countryside for the national holiday.
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- RicePikey
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All I know is that I had a guy with a moto and a fan repair shop behind it, and he replaced my bulky (shamrock shaped?) cheap plastic, see through blades with thinner orange seemingly rubber-plastic blades. He put them on with a bit of relish, I guess they cost more than the regular fat blades, but by barely a pittance.
They've outperformed any other blades I have ever seen or used (on standard-sized fans), since they are smaller and possibly lighter then the normal kind. I think they therefore spin FASTER, to make up for the lack of size. They're the best so far, for such a reasonable price!
The fat plastic blades always crack. These slimmer orange blades cannot break or crack, they're semi-flexible.
My two cents on fans, they run cheap! Just need electricity!
They've outperformed any other blades I have ever seen or used (on standard-sized fans), since they are smaller and possibly lighter then the normal kind. I think they therefore spin FASTER, to make up for the lack of size. They're the best so far, for such a reasonable price!
The fat plastic blades always crack. These slimmer orange blades cannot break or crack, they're semi-flexible.
My two cents on fans, they run cheap! Just need electricity!
Fool's folly is following another fool.
- The Grand Jester
Caution: all of my posts are to be taken with a grain of salt, heroin, and Everclear. Then you can reply back to us.
- The Grand Jester
Caution: all of my posts are to be taken with a grain of salt, heroin, and Everclear. Then you can reply back to us.
Now THERE is some useful information!TristranandIsolde wrote:....spin FASTER, to make up for the lack of size.
Riveraffront, to clear things up a bit, is it actually your impression that a fan reduces the temperature of air?
Touched by His Noodly Appendage
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Yes, sir. That's correct. If you position the fan in front of a window, it will make the breeze seem cooler. Thermodynamics be damned, it feels cooler. Without the fan and without air conditioning, i would be sitting in my room like colonel Kurtz, talking to myself.Kpal wrote:Now THERE is some useful information!TristranandIsolde wrote:....spin FASTER, to make up for the lack of size.
Riveraffront, to clear things up a bit, is it actually your impression that a fan reduces the temperature of air?
I'll take that as a "no".Riveraffront wrote:Yes, sir. That's correct. If you position the fan in front of a window, it will make the breeze seem cooler. Thermodynamics be damned, it feels cooler. Without the fan and without air conditioning, i would be sitting in my room like colonel Kurtz, talking to myself.Kpal wrote:Now THERE is some useful information!TristranandIsolde wrote:....spin FASTER, to make up for the lack of size.
Riveraffront, to clear things up a bit, is it actually your impression that a fan reduces the temperature of air?
Touched by His Noodly Appendage
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You answer your question, please.Kpal wrote:I'll take that as a "no".Riveraffront wrote:Yes, sir. That's correct. If you position the fan in front of a window, it will make the breeze seem cooler. Thermodynamics be damned, it feels cooler. Without the fan and without air conditioning, i would be sitting in my room like colonel Kurtz, talking to myself.Kpal wrote:Now THERE is some useful information!TristranandIsolde wrote:....spin FASTER, to make up for the lack of size.
Riveraffront, to clear things up a bit, is it actually your impression that a fan reduces the temperature of air?
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- 5 minutes to kill
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I bumped that for you, Ricecakes. Thought the other thread would have died. Anyway, he'll never see the fan again, Brunt is Charlie Kumar.
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