CASE STUDY
SCOPE OF WORK
ECM-1. Install VFDs for AHU fans and pumps at chiller plant
- All AHUs (10 hp each, Qty 24)
- Chilled water pumps (25 hp each, Qty 2)
- Condenser water pumps (20 hp each, Qty 2)
- Hot water pumps (20 hp each, Qty 2)
ECM-2. Control Upgrade
AHUs serving the retail space (Qty 14)
- Remove existing pneumatic controls
- Install and program new BACNET IP controllers
- Install new temperature sensors
- Install new space temperature sensor / thermostats
- Install new EP transducers to control existing pneumatic valves
- Install new IP connections (network switches and cables)
AHUs serving the Tower (Qty 10)
- Remove existing Carrier controllers
- Install and program new BACNET IP controllers
- Reuse existing temperature sensors and pneumatic valves
- Install new IP connections (network switches and cables)
Chiller and boiler plant
- Install and program new BACNET IP controllers with adequate IO modules
- The new controllers will control all major equipment including chillers, boilers, pumps, cooling towers, valves, etc.
- Install new sensors where necessary and re-use existing sensors
- Install new IP connections (network switches and cables)
Miscellaneous
- Install new CO2 sensors in representative locations to monitor building ventilation
- Install a new building pressure sensor to monitor building pressurization
- Install an outside air temperature / humidity combo sensor
Building Automation System
- Install a new cloud-based BAS based on latest Niagara-platform
- Install supervisor license on a new server PC
- Integrate all IP devices into the supervisor
- Create graphics for all major HVAC systems and equipment
- Setup schedules, alarms and trends
- Alarm notifications can be sent through emails or text messages to designated personnel with manageable escalation schemes (internet required).
- Weather data (and forecast) can be made directly available to BAS through internet from selected weather station(s) to help BAS and building operators making operational decisions
ECM-3. HVAC optimization
Central Utility Plant
- Optimize and reset chilled/hot water loop differential pressure (DP) setpoints based on
building demand and/or weather conditions - Implement/optimize chilled/hot water temperature setpoint reset based on weather and load conditions
- Optimize and reset condenser water temperature setpoints based on outside air wet bulb
temperature - Control and optimize condenser water pump speeds based on chiller load and condenser
water differential temperature - Optimize cooling tower fan staging and fan speed control
- Optimize chiller staging control for overall maximum plant efficiency
- Automate and optimize switching between heating and cooling based on weather and/or room conditions(1)
AHUs
- Implement on/off scheduling and optimal start/stop for applicable units
- Implement night setback for applicable units
- Implement demand-based ventilation for tower units
- Implement single zone VAV strategy for retail space to improve comfort control and save
energy - Optimize discharge temperature setpoints for tower AHUs based on weather and/or room conditions(1).
Notes
- Room controls need to be upgraded for BAS to gather room conditions data.
Project Costs and Energy Savings
Notes
- the estimated energy cost savings is based on blended electricity rate of $0.084 per kWh.
- a $35,000.00 credit to be used to cover cost overages (with mutual written approval to do so) as needed, and reduce the contract total amount upon project completion, if not used.
