To earn this credit your project must submeterSubmetering is used to determine the proportion of energy or water use within a building attributable to specific end uses such as tenant spaces, or subsystems such as the heating component of an HVAC system. at least two water subsystems. This credit is typically low-cost and easy to implement, while offering significant long-term benefits, including providing building operators with the tools to track, manage, and optimize water use at the subsystem level.
For the irrigation, indoor plumbing, domestic hot water, and process waterProcess water is used for industrial processes and building systems such as cooling towers, boilers, and chillers. It can also refer to water used in operational processes, such as dishwashing, clothes washing, and ice making. subsystems, only 80% of the total end use has to be metered. This provides some flexibility for projects that have design considerations that might prevent metering of 100% of a given subsystem. For boiler metering to contribute to credit compliance, the boiler must use at least 100,000 gallons of water a year, or at least 500,000 BtuH/year. Metering reclaimed water sources can contribute regardless of rate (quantity of water), but 100% of the system must be metered.
Several types of meters can meet the credit requirements, from high-end, BAS (building automation system) integrated meters to simple, manual read and clamp-on meters. Note that these submeters need to track consumption within the whole building consumption tracked by the main meter(s) installed per the prerequisite.
While metering duration and frequency are not specified for this credit, daily and weekly readings provide much higher resolution and better feedback to building operators, compared to monthly and annual tracking. Try to integrate frequent water use reading and analysis into standard operating and maintenance procedures.
If you have absolutely no other uses, then USGBC's intent is that the project is not eligible for the credit because it's not doing anything beyond what's required in the prerequisite. However, there are often items that can be treated as either domestic hot water or processes. Note that if the water is going to two uses, you can use one whole-building meter and one sub-meter to derive the usage of the second process by subtraction.
To support water management and identify opportunities for additional water savings by tracking water consumption.
Install permanent water meters for two or more of the following water subsystems, as applicable to the project:
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