Information/Ideas needed

Al Letellier_9

Great idea, Dan, as always. Do you have a source or manufacturer of these units? I've never used on before.
AL

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Al Letellier_9

cooling discharge water

A little off topic but even us old timers needs some new ideas once in a while.....I have a local plumber needing help. He has been asked to install a commercial dishwasher in a church kitchen. The building is on a septic tank and discharging very hot water will kill the bacteria in the tank. The DW discharges approx. 15 gallons of 180* water each cycle. Any thoughts or info on how to size a cooling tank for this application, or any info on any manufacturers that do this kind of thing.
As always thanks for any input.

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DanHolohan

Why not use

a gray-water heat-recovery exchanger. He could use the recovered heat to preheat the domestic cold water.

Brad White_185

And

if the residual heat is too high, finish it off with a cool-down unit such as a Dri-Steem Drane Kooler. (Yes, I can spell. No they cannot

I would go with Dan's idea first, especially if the cold source is right nearby. If the dishwasher takes in say 140F and boosts internally to 180F there may not be a neat opportunity, but do seek it out.

Al Letellier_9

drane kooler

Thanks Brad. Found the site and there is rep right here in Portland.

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DanHolohan

I Googled this one:

GFX

Al Letellier_9

heat recovery

Thanks Dan. I found that one but I think Brads idea may work the best. There simply isn't enough consistant flow or water use to make it work well. The Dri-Steem unit may just do the trick although most likely more costly.
See you in Hartford.
AL

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Doug_7

180 Degree Water Temperature ?

Our dishwasher (Frigidare) has a Hi-Temp Wash Option that boosts temperature to 140 F for the initial wash to activate the detergent to cut grease.

It also has a Hi-Temp Rinse Option for the final rinse that boosts water temperature to 140 F to promote drying. It also has a Heat Dry Option to promote drying after the final rinse.

Check the dishwasher manual and the actual water temperature, because 180 F seems way too high. Is 180 F the actual temperature or a guesstimate ?

Brad White_185

180F

Is an NSF standard for final rinse temperature in a commercial dishwasher and is also stipulated by many local health departments. Residential I am sure would be less.

In recent years we have seen a chemical final rinse but my guess is, that would be detrimental to the septic system and not mitigated by dilution as much.

Doug_7

Thanks

Brad - Thanks for that explanation.

Good information on drane kooler.