Heat Tranfer

[kirkwood]

I am wondering how much difference there would be in heat transfer into the system by running an external iwaki 1200gph pump or 2 internal pumps (quietone 2200 450gph and mag 9.5)?

 

[ff337]

From my understanding they internal pumps do create quite a bit of heat. I used a mag 12 but also used metal halides. Therefor needed a chiller

 

[joseayes]

I would just run them away from the system, to test that so you can compare them, I had a 5 gallon rubbermaid container that I installed a bulkhead and then closed loop the iwaki to it, I had the iwaki connected to bulkhead and in the output I had a gate valve to reduce the flow (same as the head pressure will do in your tank) then I have check water temperature and pump temperature (to determinate if an extra fan is need it to keep pump cooler)
Then I would test the internal pumps in same volume of water and throttle them back to reduce flow and get the temperature readings in the same time I had the ext pump working.

 

[cdavidson]

The internal pump is going to transfer more heat into the system than the external pump. All i could see on Danner's website is that the Mag 9.3 draws 93 Watts. I wonder if they would give you an efficiency plot if you called them. That would allow you to see the efficiency for the pressure head that will be used in your application and allow you to determine the amount of heat generated by the internal pump.

 

[skriz]

The mag 9.5 added 5 degrees to my system. Went with a bl-40x and never looked back. Danner mag pumps are awful.

 

[eagle9252]

i took out my mag9.5 durring the end of the summer to reduce heat... now my heater is actully having to work this winter

 

[ichthyoid]

Kirkwood;835355 wrote: I am wondering how much difference there would be in heat transfer into the system by running an external iwaki 1200gph pump or 2 internal pumps (quietone 2200 450gph and mag 9.5)?

You may assume that submersible pumps will dissipate most of their wattage as heat into your tank.

Unless your house stays really cold, I would opt for external pumps whenever possible. Otherwise the submersible pump acts like a submersible heater.

 

[jef4y]

mag pumps run hot & generate a ton of heat IME.

An external pump adds no heat & generally moves water a lot better than in-sump pumps.

You can get cooler running in-sump pumps, i.e., marineland, but I am a fan of external where possible.

 

[kirkwood]

You have all pretty much given me the final kick in the @$$ to get my external pump installed. I've got an external Iwaki 1200gph ready for intall. I just have to drill the sump and get it plumbed. Hopefully February is the month to get this done. Always challenging thought to pull the sump off a running system.

 

[ichthyoid]

Fwiw-
Eheims have low watts/gallons pumped ratios (ie- they are more efficient/draw fewer watts) than your average pump. Can be used internal or externally.

 

[jef4y]

Kirkwood;835452 wrote: You have all pretty much given me the final kick in the @$$ to get my external pump installed. I've got an external Iwaki 1200gph ready for intall. I just have to drill the sump and get it plumbed. Hopefully February is the month to get this done. Always challenging thought to pull the sump off a running system.

2 things you should know ahead of time.

1 - Iwaki pumps can be noisy. Not ridiculous, but more than I expected.
2 - They run RIDICULOUSLY hot. Like you won't be able to hold your hand on the motor for more than 1-2 seconds when running. This is normal, and there is a thermal cutoff for them.

 

[kirkwood]

JeF4y;835473 wrote: 2 things you should know ahead of time.

1 - Iwaki pumps can be noisy. Not ridiculous, but more than I expected.
2 - They run RIDICULOUSLY hot. Like you won't be able to hold your hand on the motor for more than 1-2 seconds when running. This is normal, and there is a thermal cutoff for them.

I saw a video from BRS where they compared the Iwaki 40 japanese motor (the one I have) to the Iwaki 40 (American Motor), and comparable PanWorld.. The Iwaki japanese motor was determined to be the quitest of all the motors.

I didn't know about the heat running it. That heat doesn't transfer into the water though, right?

 

[jef4y]

Kirkwood;835511 wrote: I saw a video from BRS where they compared the Iwaki 40 japanese motor (the one I have) to the Iwaki 40 (American Motor), and comparable PanWorld.. The Iwaki japanese motor was determined to be the quitest of all the motors.

I didn't know about the heat running it. That heat doesn't transfer into the water though, right?

Yeah, I have the american motor & it's loud.

And no, the heat does not transfer.

It just freaked me out until I found out that it is normal. Most of the panworld (except the smallest ones) have fans built in to cool them down.