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airspirit · 07-12-2002, 03:57 PM

You could test, but I'll demonstrate the two scenarios:

Situ1 (inline): The heat bleeds from the motor to the housing, most of which is surrounded in open air, and part of which is filled with water. The water filled portion wicks heat FASTER than the air (not an assumption unless you have VERY large surface area on your pump) giving half, or maybe more of the heat energy to your water. A fan may help lower that transmission by putting cooler air over the pump allowing it to wick more heat to the air.

Situ2 (subm): All heat generated by the pump will go into the water. There is nowhere else for it to go. It doesn't just disappear.

The only caveat is that the inline pump will create more heat per W rating due to motor friction (the subm normally are water lubed as well while inline are NOT).

I don't know if that babbling helps, but it seems to apply ... heh.

Edit: Skulemate, damn near everything can transmit heat. Though the motor compartment is sealed, it does generate heat, and it must go somewhere. Heat does not just diappear. It ends up bleeding through the casing, part of which is in contact with the water. The rest is detailed above.

07-12-2002, 03:57 PM	#12
airspirit Been /.'d... have you? Join Date: Jul 2002 Location: Moscow, ID Posts: 1,986	You could test, but I'll demonstrate the two scenarios: Situ1 (inline): The heat bleeds from the motor to the housing, most of which is surrounded in open air, and part of which is filled with water. The water filled portion wicks heat FASTER than the air (not an assumption unless you have VERY large surface area on your pump) giving half, or maybe more of the heat energy to your water. A fan may help lower that transmission by putting cooler air over the pump allowing it to wick more heat to the air. Situ2 (subm): All heat generated by the pump will go into the water. There is nowhere else for it to go. It doesn't just disappear. The only caveat is that the inline pump will create more heat per W rating due to motor friction (the subm normally are water lubed as well while inline are NOT). I don't know if that babbling helps, but it seems to apply ... heh. Edit: Skulemate, damn near everything can transmit heat. Though the motor compartment is sealed, it does generate heat, and it must go somewhere. Heat does not just diappear. It ends up bleeding through the casing, part of which is in contact with the water. The rest is detailed above.