I am unable to get clarification on two requirements for this Pilot credit:
1) the prerinse spray valve flow rate of 1.3 gpm. Does this apply to dishwashers? If yes, manufacturers do not supply this information.
2) Water temperature tempering. Would this apply to the dishwasher also? If yes, the residential dishwasher in our project, made by GE, does not include a water tempering feature.
Any help on this topic would be appreciated.
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Susan Walter
HDRLEEDuser Expert
1296 thumbs up
March 1, 2011 - 2:20 pm
I would think that the prerinse spray valve would be part of a process done outside of the residential dishwasher and that the manufacturer could provide a total water consumption for the different cycles of the dishwasher. If your user is processing dishes by spraying them first and then loading into the dishwasher, that is the spray valve you need to find. The dishwasher has no mixing valve? That is what is tempering the water.
Gabriele E. Bibee
Architectural InternClark Nexsen Architecture & Engineering
6 thumbs up
March 1, 2011 - 2:43 pm
Based on this coment I am assuming that the requirement for the prerinse spray valves would only apply to a commercial dishwasher one would find in a restaurant. I am still puzzled about the water temperature tempering requirement found in table 2.-min. performance requirements for water-consuming processes. Would this apply to the hot water being discharged by a dishwasher?
Batya Metalitz
Technical Director, LEEDUSGBC
LEEDuser Expert
318 thumbs up
March 2, 2011 - 9:54 am
I don't have a perfect response here, as systems are different, but in general "pre-rinse spray valve" is referring to a stand alone spray hose that is often used in food service settings but wouldn't likely be present in an office kitchenette, for example. It is not referring to a part of the dishwasher.
As for the temperature tempering requirement, we received many public comments on the temperature tempering language in this credit and the difficultly in implementing the strategy that is outlined in the credit. It is currently being revisited by the Water Efficiency Technical Advisory Group (WE TAG) and will be modified/clarified for better use by project teams.
In the meantime, please document the flow rates and labels of your process water and appliances for pilot credit review. For the dishwasher, we'll be looking for whether the dishwasher meets ENERGY STAR, which has a water efficiency component. We anticipate that the new version of the pilot credit (with clarifications) will be up in July. Currently registered projects may switch to the new language at that time.
Suzanne Painter-Supplee, LEED AP+ID&C
PrincipalSEESolutions LLC
126 thumbs up
April 20, 2011 - 8:35 pm
Better late than never--if this is a commercial project.......-the commercial dishwasher gpm/gph can be found via NSF--http://www.nsf.org/Certified/Common/Company.asp?TradeName=&CompanyName=&.... Also, there is no ENERGY STAR standard for flight-type dishwashers, which are most common in hospitals, hotels, universities, etc. LEED for Healthcare and Retail have gal/rack standards, and a gph for flights.
Batya Metalitz
Technical Director, LEEDUSGBC
LEEDuser Expert
318 thumbs up
April 21, 2011 - 10:29 am
To add on to Suzanne's post, this pilot credit is based on the proposed appliance & process water prerequisite, which does not currently place requirements on flight type dishwashers. However, the proposed appliance & process water credit will have a performance metric for flight type dishwashers of 150 gph. We're also revising some of the other prerequisite and credit numbers for second public comment to better align with LEED for Retail and Healthcare numbers, and with what's available in the market. Those new numbers (and a new version of the pilot credit) should be out in July or so.