Water pump questions - Page 2

jastrckl · 09-05-2001, 01:11 PM

koro:
"will a 26 watt pump add more heat compared to one that uses 8 watts?"

short answer:
yes-but it's not that simple.

long answer:
the majority of heat added by these pumps is not from electrical resistance but instead from friction generated by the act of pumping itself. In a shaft driven pump, a negligible ammount of heat does transfer from the "driving" side to the "driven" side since there is a good path for conducting heat. In a mag drive pump, this heat transfer is practically nil, and nearly any heat generated is strictly from the act of pumping the water around, bearing friction, etc. Odds are a pump that consumes more wattage has a higher rating, so this of course means more heat is added to the water-it also means however that you're passing more water through. You end up with a balancing act of which is better, less heat added, or more water pushed. Once you reach a certain point, all you'll be doing is adding heat and you'll get not only diminishing returns but decreasing returns.

jastrckl · 09-05-2001, 01:13 PM

koro:
"will a 26 watt pump add more heat compared to one that uses 8 watts?"

short answer:
yes-but it's not that simple.

long answer:
the majority of heat added by these pumps is not from electrical resistance but instead from friction generated by the act of pumping itself. In a shaft driven pump, a negligible ammount of heat does transfer from the "driving" side to the "driven" side since there is a good path for conducting heat. In a mag drive pump, this heat transfer is practically nil, and nearly any heat generated is strictly from the act of pumping the water around, bearing friction, etc. Odds are a pump that consumes more wattage has a higher rating, so this of course means more heat is added to the water-it also means however that you're passing more water through. You end up with a balancing act of which is better, less heat added, or more water pushed. Once you reach a certain point, all you'll be doing is adding heat and you'll get not only diminishing returns but decreasing returns.

09-05-2001, 01:11 PM	#26
jastrckl Cooling Neophyte Join Date: Jun 2001 Posts: 26	koro: "will a 26 watt pump add more heat compared to one that uses 8 watts?" short answer: yes-but it's not that simple. long answer: the majority of heat added by these pumps is not from electrical resistance but instead from friction generated by the act of pumping itself. In a shaft driven pump, a negligible ammount of heat does transfer from the "driving" side to the "driven" side since there is a good path for conducting heat. In a mag drive pump, this heat transfer is practically nil, and nearly any heat generated is strictly from the act of pumping the water around, bearing friction, etc. Odds are a pump that consumes more wattage has a higher rating, so this of course means more heat is added to the water-it also means however that you're passing more water through. You end up with a balancing act of which is better, less heat added, or more water pushed. Once you reach a certain point, all you'll be doing is adding heat and you'll get not only diminishing returns but decreasing returns.

09-05-2001, 01:13 PM	#27
jastrckl Cooling Neophyte Join Date: Jun 2001 Posts: 26	koro: "will a 26 watt pump add more heat compared to one that uses 8 watts?" short answer: yes-but it's not that simple. long answer: the majority of heat added by these pumps is not from electrical resistance but instead from friction generated by the act of pumping itself. In a shaft driven pump, a negligible ammount of heat does transfer from the "driving" side to the "driven" side since there is a good path for conducting heat. In a mag drive pump, this heat transfer is practically nil, and nearly any heat generated is strictly from the act of pumping the water around, bearing friction, etc. Odds are a pump that consumes more wattage has a higher rating, so this of course means more heat is added to the water-it also means however that you're passing more water through. You end up with a balancing act of which is better, less heat added, or more water pushed. Once you reach a certain point, all you'll be doing is adding heat and you'll get not only diminishing returns but decreasing returns.

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