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CS-v4 WEc3:Cooling tower water use

ACP - No Cooling Tower (Core & Shell v4)

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Anke Koch
Architect LEED AP
Ingenieurbüro Anke Koch GbmH
LEEDuser Basic Member
5 thumbs up

Hi everybody,

I've got two questions regarding the pilot credit "No Cooling Tower" which is an alternative compliance path to the LEED v4 credits Cooling tower water use (BD+C).

1)

If I read the credit requirements under the credit library, the first bullet point is confusing me:

Projects without Cooling Towers or Evaporative Condensers (Headline)

Projects may earn full credit if all conditions are met:

  • the baseline system designated for the building using ASHRAE 90.1-2010 Appendix G Table G3.1.1 includes a cooling tower (systems 7 & 8)
  • the project design case does not include a cooling tower
  • ......
  • ......

I don't understand the following part at the end of the first bullet point: "includes a cooling tower".

Therefor my question is: Why should the building system have a cooling tower included? As I understand the pilot credit "No Cooling Tower", this credit can only be applied to projects without a cooling tower. Otherwise I might misunderstand the credit intent or do not read the first bullet point correctly. 

2)

To my project: Based on the floor area, which is more the 14,000 sqm, the project falls within the systems 7 and 8. The heat will be generated by a condensing gas boiler plus heat pumps.  The building will be cooled by a closed cooling circuit which is filled with water. The building does not have a cooling tower and will be designed in accordance with System 7 (ASHRAE 90.1-2010 Appendix G Table G3.1.1). My question to the designated baseline system: Are the credit requirements fulfilled if my project complies EITHER with System 7 OR with System 8, or does the project has to comply with System 7 AND 8?

Thanks in advance for your answers and help.

Best regards

1
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Erkki Seinre
Sustainability consultant
BuildingLabel OÜ
LEEDuser Basic Member
2 thumbs up

Thu, 08/06/2020 - 13:13

Hi Concerning the part 1 of the question refers to ASHRAE 90.1 and Cooling type: Chilled water (which by default is expeted to be prepared by Cooling Tower). Thus, if based on 90.1 your building should have system 7 or 8 (with Cooling tower) your baseline building (refer to Optimized Energy Performance credit) has it and designed does not, you comply with the requirements. Concerning the 2) part I am sure it considers EITHER, thus whether system #7 or #8. FAQ (https://leeduser.buildinggreen.com/forum/acp-no-cooling-tower-core-shell-v4) also confirms my understanding of the interpretation.

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