we have the opportunity to save 500 kW cooling energy wehn we establisch evaportive cooling in the AHU. At the location demineralized water is availlable. Its the headquarter of an big chemistry manufacturer and direct beside the plant area.
1.) can we fullfill the prerequisit "no once-through cooling" when we save much electrical power and mechanical cooling demnad?
2.) who is it to be considered in the water consumption credit
thanks for reply
emily reese moodySustainability Director, Certifications & Compliance
394 thumbs up
July 15, 2022 - 12:30 am
I do not believe demineralized water is considered potable water, according to the WHO. The Prereq states "No once-through cooling with potable water for any equipment or appliances that reject heat." Based on that, I should think you would be fine to use the demineralized water as mentioned. I would carefully explain the source(s) in a narrative that goes with your documentation so that it's clear to the reviewers.
For your second question, I'm not sure what you mean... can you elaborate or ask it in a different way? The Reference Guide will direct you on the various requirements; the Credit Form on your LEED website will clarify exactly what documentation is needed. Normally, the plumbing engineer fills out the documentation, though you may need to help collect info from a few people.
Arwid Theuer-Kock1plus Consult GmbH
July 15, 2022 - 5:20 am
thank you for the response!
The 2. question is not "who" but "what" is to be reported for water consumption in the credit WE indoor water use reduction "Table 3 - processes" under cooling towers and evaporative condensers? when it is no potable water the reduction is 100% - but maybee it is processed from potable water... we will clear it with the owner
WE Cooling tower water use -
a) Maximum concentrations for parameters in condenser: should be no problem with demineralized water
b) Points for cooling tower cycles: we don´t have a cycles when using evaporative cooling... anyway here we compile the narrative and explane the situation on site.