LI 10460 Centrifugal chillers and v4 Enhanced Refrigerant Management | U.S. Green Building Council
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Created on July 8, 2017

LEED Interpretation

ID# 10460

Rating System

LEED BD+C: New Construction, LEED BD+C: Core and Shell, LEED BD+C: Schools, LEED BD+C: Retail, LEED BD+C: Healthcare, LEED BD+C: Data Centers, LEED BD+C: Hospitality, LEED BD+C: Warehouses and Distribution Centers, LEED ID+C: Commercial Interiors, LEED ID+C: Retail, LEED ID+C: Hospitality, LEED O+M: Existing Buildings, LEED O+M: Schools, LEED O+M: Retail, LEED O+M: Data Centers, LEED O+M: Hospitality, LEED O+M: Warehouses and Distribution Centers

Rating System Version

v4 - LEED v4

Inquiry

What capacity is to be used for centrifugal chillers that, due to their selection conditions, cannot operate at AHRI standard conditions?

The AHRI flow rates are based on capacity. This leads to circular calculation since AHRI standard conditions are dependent on capacity, but capacity is the desired output. How does the project team resolve this circular calculation?

Ruling

To determine the Gross AHRI rated cooling capacity (tons) of an individual HVAC or refrigeration unit that cannot operate at AHRI standard conditions, use the design and selected conditions of the equipment drawing or schedule. Enter this cooling capacity in the Qunit (tons) column in Table. Mechanical and Cooling and Refrigeration Equipment in the credit form.

To determine unit capacity in tons for centrifugal chillers that cannot operate at AHRI standard conditions, use selected flow rates for the evaporator, and use standard AHRI temperatures established for the individual HVAC or refrigeration unit.

Applicable Credits

Name : Enhanced refrigerant management
Rating system : New Construction,Core and Shell,Schools - New Construction,Healthcare,Data centers - New Construction,Hospitality - New Construction,Warehouse and distribution centers - New Construction,
Rating system version : v4

Name : Enhanced refrigerant management
Rating system : Commercial Interiors,Hospitality - Commercial Interiors,
Rating system version : v4

Name : Enhanced refrigerant management
Rating system : Existing Buildings,Schools - Existing Buildings,Data centers - Existing Buildings,Hospitality - Existing Buildings,Warehouse and distribution centers - Existing Buildings,Multifamily Existing Buildings,
Rating system version : v4

Credit Name Enhanced refrigerant management
Credit Category Energy & atmosphere
International Applicable Internationally applicable
Campus Applicable Not campus applicable