Does 6 kW Cooling Fan = 6 kW of Heat?

AI Thread Summary
A 6 kW cooling fan does not equate to adding 6 kW of heat to a room. The fan's primary function is to move air, and while it consumes 6 kW of energy, only a portion of that energy is converted into heat due to motor inefficiencies. The actual heat contribution from the fan is minimal and primarily consists of waste heat from the motor. Therefore, it is incorrect to assume that the fan's energy consumption directly increases the cooling load by 6 kW. Understanding the fan's role and energy conversion is crucial for accurate cooling calculations.
TSN79
Messages
422
Reaction score
0
If one has a cooling fan that uses 6 kW, does that automatically mean that the room receives 6 kW worth of heat?
 
Physics news on Phys.org
Could you elaborate upon the question? The answer is going to be 'no', but I'm not really sure what you're talking about.
 
Well, I'm doing a calculation on a rooms need for cooling. This need is of course linked to how much heat gets into the room during some period of time. Now, there is this fan in the room that has an effect of 6 kW, but am I to assume that all this energy is converted into heat and added to the room so that there would just be another 6 kW for the cooling system to remove? Or will only a portion of this energy actually be turned into heat?
 
It's still a little vague. From your first post, I thought you meant that the fan drew 6KW in order to operate. This time, it seems that you mean its cooling capacity (which doesn't really apply) is 6KW. The fan itself will only move air, not cool it. In that case, the heat that it supplies to the room is waste from the motor. I think that this is a Fred or Clausius sort of question, or Astro. Come to think of it, isn't this Russ' specialty? Anyone but me... help!
 
I would say that it depends on the efficiency of the motor. Whatever energy is not used for pushing air of those 6 KW then is heat.
either way i don't think a motor by itself woulf cool the room, if you aimed it at water on the room then that would help (until the water recondensated)
 
TL;DR Summary: I came across this question from a Sri Lankan A-level textbook. Question - An ice cube with a length of 10 cm is immersed in water at 0 °C. An observer observes the ice cube from the water, and it seems to be 7.75 cm long. If the refractive index of water is 4/3, find the height of the ice cube immersed in the water. I could not understand how the apparent height of the ice cube in the water depends on the height of the ice cube immersed in the water. Does anyone have an...
Kindly see the attached pdf. My attempt to solve it, is in it. I'm wondering if my solution is right. My idea is this: At any point of time, the ball may be assumed to be at an incline which is at an angle of θ(kindly see both the pics in the pdf file). The value of θ will continuously change and so will the value of friction. I'm not able to figure out, why my solution is wrong, if it is wrong .
Back
Top