PS
1
Required Tasks Efficient On a basic building the design team integrates a system that monitors the building water source and the major water systems in the building. Installation of water meters connected to the building management system is required. On small, simple buildings monitoring points may be limited to water entry and the building domestic hot water system. In larger buildings, monitoring may include boiler, chilled water, cooling tower, irrigation, domestic water heater and plumbing fixtures. Refer to OP 1 . PE During construction, the commissioning team ensures the monitoring systems are installed and are recording data into the building management system. CX During building operation, data are collected and monitored. A measurement and verification plan is developed to record and monitor water usage and trends. An action plan is developed to respond to situations in which water usage exceeds the normal trends. The action plan will include tasks such as checking for water leaks. The building operator will develop a schedule to review data and make necessary water balance adjustments during operations. This can be accomplished with a regular building water audit. BO
Renovation Renovation projects should match the tasks of new construction and include the renovated water systems of a building.
138 / Water Conservation Manual
Water Balance
More Efficient More efficient buildings should match the tasks of the efficient building water balance with some additional tasks. More efficient buildings will usually incorporate at least one water reuse system. The water balance is important to first identify the possible systems that can be reused, and second to design the piping, pumps, tanks and equipment for the system. Early in the schematic design phase (SD), a proposed water balance calculation needs to be developed by the plumbing engineer on the potential building water sources and water uses. This will include stormwater, condensate, graywater, blackwater, and other water sources and uses. On simple, small to medium sized buildings, stormwater and/or building air conditioning condensate reuse systems can be used. Performing the calculation will require that the plumbing engineer obtain water source and use data from the different design team disciplines such as the mechanical engineer, civil engineer, landscape architect, operator, and others involved with potential water systems using or discharging water. Upon completion of the water balance calculation, the design team must determine if incorporating a water reuse system is feasible at building construction or at a future point during building operation. If feasible at construction, the water reuse system will be designed into the building. If feasible at a later date, a water, waste, and/or energy pod must be incorporated into the design to allow for future water reuse systems. A multiple piped system must be installed in the building for the future water reuse system.