Do pumps generate a lot of heat?
- Thread starter Nim Dibbley
- Start date
Burko;4404760; said:"Where did that come from...... "
James Prescott Joule 1843...
You can find his ancestor 'Kilo Joule' on the back of a chocolate bar...
Mr Joule is rolling over in his grave then lol
Look, nothing is free! If it's a 50 watt pump and it's moving water, then 50 watts can not all go to heat. This is a math function just like money. If you have $50 most of that goes to moving water and the change (tax) goes to heat. The total = 50 - nuff said.
This isn't top secret stuff, it's all in books.
Remember: "Nothing is free" a quote by my dad: Mr Egon to you guys.
"Look, nothing is free! If it's a 50 watt pump and it's moving water, then 50 watts can not all go to heat."
Its not free, I agree, energy is conserved.
However... when moving water comes to a standstill where has the energy gone? For the most part it is turned into heat via friction.
Its not free, I agree, energy is conserved.
However... when moving water comes to a standstill where has the energy gone? For the most part it is turned into heat via friction.
Burko;4405108; said:
So where did the energy go to move the water initially? My answer: The energy went to moving the water.
Total moving the water energy expended and you get 99% of total energy used. Then there's heat given off to move the water .9% then there's the heat given off for water slowing down from "friction" .1%
Total 100%
To answer the OP's question: Yes pumps give off heat but their primary job and energy expenditure is pumping water. You cannot heat your aquarium with pump heat alone.........
Disclaimer: The numbers above is just a guess, I truly believe the heat created by "friction" from the water slowing down inside a fish tank is exponentially less. I just used these numbers because they are easy to add up to make a point.
"I truly believe the heat created by "friction" from the water slowing down inside a fish tank is exponentially less."
Yeah its not something that I jumped to straight away myself.
From reading on the subject matter it seems that _all_ energy turns into heat 'eventually'.
For now...I guess we will have to agree to disagree.
Yeah its not something that I jumped to straight away myself.
From reading on the subject matter it seems that _all_ energy turns into heat 'eventually'.
For now...I guess we will have to agree to disagree.
To answer the OP's question: Yes pumps give off heat but their primary job and energy expenditure is pumping water. You cannot heat your aquarium with pump heat alone
If you have a pump whose motor is excessively hot, there is something wrong with it and it will fail soon.
The amount of heat generated by the "friction" of the impeller spinning in a water filled pump cavity is next to none.
The heat is caused by all those electrons being shoved through the motors windings, which is causing the impeller to spin.
If you look at a chart, showing the power consumption of different pumps all flowing the same GPH, you can see a wide range of efficiency.
All has to do with components used in motor construction. Amount of impurities in the wire used for the windings. Gauge of wire. Physical layout of the windings.
Bottom line is yes, a submerged pump will transfer heat to your water but not at the wattage listed as it`s power consumption.
Interesting side note, we in the USA could save a great deal of electrical energy by changing our AC voltage standard from 120vac to 220vac like the bulk of the other nations use.
If you have a pump whose motor is excessively hot, there is something wrong with it and it will fail soon.
The amount of heat generated by the "friction" of the impeller spinning in a water filled pump cavity is next to none.
The heat is caused by all those electrons being shoved through the motors windings, which is causing the impeller to spin.
If you look at a chart, showing the power consumption of different pumps all flowing the same GPH, you can see a wide range of efficiency.
All has to do with components used in motor construction. Amount of impurities in the wire used for the windings. Gauge of wire. Physical layout of the windings.
Bottom line is yes, a submerged pump will transfer heat to your water but not at the wattage listed as it`s power consumption.
Interesting side note, we in the USA could save a great deal of electrical energy by changing our AC voltage standard from 120vac to 220vac like the bulk of the other nations use.
Burko;4405222; said:
All energy cannot eventually turn into heat. How is light energy turned into heat? Light refracts and travels, if I shine a 500 watt spotlight at my neighbors house does it heat it? NO it will absorb some light and reflect the wavelengths that the surface can't absorb.
Also when the pump stops pumping water the energy used decreases. Check the amp draw it is no longer using its running amps.
KaiserSousay;4405452; said:
This isn't true at all. You need the same amount of electrical energy to do the same thing. If you do it with twice the voltage you will only require half the amperage. So if you had a 100 watt light bulb and powered it with 120 volts than it would use just under an amp. If you powered it with 240 volts than it would use half. You pay for watts, watts=volts x amps. You can save money by not having to use larger wires for the same appliances, but it only matters on something with a real power draw.
This isn't true at all. You need the same amount of electrical energy to do the same thing.
Au contre, mon frer
http://science.howstuffworks.com/environmental/energy/question5011.htm
Thought it a pretty cool read.
Au contre, mon frer
http://science.howstuffworks.com/environmental/energy/question5011.htm
Thought it a pretty cool read.
KaiserSousay;4405608; said:
All that says is what I said, that you would save money on wire size. By that logic everybody should get three phase for their refrigerator because the motors are cheaper. Energy is energy, the loss in efficiency is in the material used for wiring not in voltage used. You are talking about fractions of cents not percentages saved.
