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wbedard · 11-29-2002, 07:07 PM

Hi all,

I am a good ways into designing a fairly typical "compound" system (freon loop cooling a water loop) and have run into a problem identifying a suitable water pump. This may sound surprising as I am certainly aware of the fine pumps typically used by most WC'ers. However, as you get into pumping low temperature (-20 to -40 deg C) mixtures of water and alcohol, glycol, etc., it seems that most of these pumps are out of their element. When you can actually find a _minimum_ fluid temperature rating for a pump, most seem to bottom out around 0 deg C. Could anyone suggest some good starting points (sites, companies, etc) for sourcing some decent low temperature pumps. These pumps should be useful/appropriate to the small percentage of WC'ers operating this type of system (ie. centrifugal, 120V, smallish form factor, etc.). Thanks in advance for any and all suggestions!

11-29-2002, 07:07 PM	#1
wbedard Cooling Neophyte Join Date: Aug 2002 Location: Maryland Posts: 6	Low temperature water pumps Hi all, I am a good ways into designing a fairly typical "compound" system (freon loop cooling a water loop) and have run into a problem identifying a suitable water pump. This may sound surprising as I am certainly aware of the fine pumps typically used by most WC'ers. However, as you get into pumping low temperature (-20 to -40 deg C) mixtures of water and alcohol, glycol, etc., it seems that most of these pumps are out of their element. When you can actually find a _minimum_ fluid temperature rating for a pump, most seem to bottom out around 0 deg C. Could anyone suggest some good starting points (sites, companies, etc) for sourcing some decent low temperature pumps. These pumps should be useful/appropriate to the small percentage of WC'ers operating this type of system (ie. centrifugal, 120V, smallish form factor, etc.). Thanks in advance for any and all suggestions!