Thread Number: 75428  /  Tag: Modern Dishwashers
Cool new conveyor dishmachine from Hobart:
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Post# 992746   5/1/2018 at 17:03 by whirlykenmore78 (Prior Lake MN (GMT-0700 CDT.))        

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Some pretty sweet engineering and looks like typical Hobart build quality and performance.

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Post# 992751 , Reply# 1   5/1/2018 at 17:18 by rinso (Meridian Idaho)        

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Love it! I can hardly wait for the residential version. We had the old-time of one of these in our family restaurant half a century ago.

Post# 992756 , Reply# 2   5/1/2018 at 17:51 by imperial70 (******)        

I was wondering when someone would do the heat exchange thing.

Post# 992784 , Reply# 3   5/1/2018 at 21:42 by neptunebob (Pittsburgh, PA)        
Probably because there will be ca-ca

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Heat exchange devices have been used on home drain pipes to recover heat from showers and the result is more visits from the Roto Rooter man. The grease and food waste will congeal in the pipes, eventually making them run slow and clogged.

Post# 992790 , Reply# 4   5/1/2018 at 22:54 by thomasortega (Los Angeles - CA)        

I loved it!

When they will make a portable mini countertop unit of it?It will be great in my tiny apartment kitchen. ROFL

Post# 992792 , Reply# 5   5/1/2018 at 23:20 by henene4 (Germany)        
Heat exchange & domestic version

With such systems, it really often is up to how they are used and how they are designed.

If the water being drained has lots of contaminants in them the flow of it shouldn't be inhibited at all, if contaminents are smaller, are less intense flow is required to keep everything from clogging.

With DW propper maintenance will be key. But I can see something like that work if done well.
Especially in a big kitchen enviroment, the DW is more of a degreaser and sanitizer then dishwasher. Most dirt is scraped of or rinsed of before the rack even gets near the machine. This means most soil in the drainwater is verry fine.
Further as far as I understand Hobarts implementation only uses the final rinse water for heat exchange purposes, so contamination in there should be minimal.

And given how little these machines use in terms of fresh water, makeing them less reliant on a stead hot water connection might be verry effective.
If the machine only pulls half a gallon of hot water each minute or so, the water in the pipeing will loose much of its heat. So using cold water instead could save more then one thinks.

On the topic of homeversions of such a thing: Never.

Tank DW only make sense when multiple loads are run in verry short following.
That type of DW takes several minutes to fill up and to heat up the water.
From there on, water is kept at temperature by massive heaters.
Water is only exchanged step by step in small quantities.

Because one tank filling has to be significantly more then a traditional DW would fill with (upwards of 5gal, ususally), that prepping cycle uses absurd amounts of energy.

If you only run 2 racks maybe and then shut the machine of again, all that energy is wasted.
If you keep it on during the day so you can run loads as you need, the heater needs to keep that huge amount of water verry hot for hours on end, wastinge insane amounts of energy.
Further, these things release massive amounts of heat and moisture into the room. If your family restaurant had something simmilar you will know the moist hot atmosphere next to the machine.

If you mean energy-recovery-systems in generall: No reason to wait, they are there. On the US market though the only machines with one that I know of are Mieles with EcoTech.

Post# 993006 , Reply# 6   5/3/2018 at 18:50 by Launderess (Quiet Please, There´s a Lady on Stage)        

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One thing to keep in mind that by local code universally unless chemical disinfection is used, final rinse for commercial dishwashers is heated to temps at or >180F. Thus that rinse water does contain quite a bit of heat that in theory could be reclaimed.

OTOH unless a domestic dw heats final rinse water temps likely are going to be lower, 140F if that.

Post# 993011 , Reply# 7   5/3/2018 at 20:10 by whirlykenmore78 (Prior Lake MN (GMT-0700 CDT.))        
@ neptunebob

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The water used for ER is from the wash tank overflow. This is 160F water charged with dishmachine detergent. Unless the operator does not pre-scrap and or change the wash water every 2 hours so the water turns to greasy soup I don't know why the pipes would back up.

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