Rees-Stealy Mira Mesa

Opportunity

Status

Estimated Start:

Total Annual Savings

Project Cost:

Project Payback:  

Description

Connected Commissioning

Not Started

FY 2024

$25,800

$120,000

4.6

Connected commissioning optimizes building performance, reduces operating and maintenance costs and extends equipment lifetimes. As a result of the energy audit, high priority lighting, automation/controls and heating, ventilation and air conditioning (HVAC)-related ECMs are recommended for implementation through a packaged connected commissioning project delivery. In most cases, the building automation system will be used to collect and analyze on-going performance data, identify new trends and ensure persistent savings from previously-implemented ECMs.

Perform connected commissioning with a focus on optimizing automated control sequences through programming and control device upgrades to achieve the following energy conservation measure outcomes. The connected commissioning process includes follow up investigation, controls upgrade specifications and sequences, coordination with installing contractor(s), and optimized control sequences validations. Control specifications and optimized sequences of operation will also be provided for all budgeted HVAC unit replacements.

Recommendation: 

The following measures were identified as specific opportunities to be completed as part of a connected commissioning process. These opportunities may be implemented independently or as part of a coordinated effort:

• Equipment Schedules for Heat Pumps - Determine the actual occupancy requirements by space/area and reduce heat pump run times with multiple automatic schedules configured to occupancy requirements. Program schedule with setbacks for unoccupied zone temperature setpoints. Create after-hours capability that can be used as needed to temporarily override normal schedules. If possible, turn off heat pumps in unoccupied areas and shut down condenser water pumps overnight.

• Heating & Cooling Setpoints (Major Spaces) - Heat pumps control to a typical setpoint of 71°F +/- 1°F leading to a range from 70 - 72°F. Increase setpoint deadband to +/- 2°F leading to range of 69°F - 73°F. Standardize settings by for all space types as applicable.

• Program Chilled Water (CHW) Setpoint Reset - Reset condenser water loop temp setpoint based on the number of heat pumps in heating and cooling. Program reset of condenser water supply temperature setpoint, (e.g. from 42 - 48°F) when outside air temperature varies from 70 - 90°F.

• Demand Response Sequence - Program sequences to allow non-critical loads such as common area lighting, fountains, displays, etc. to remain OFF during peak hours. Use any available load-shifting technology to delay energy use until after the peak period.