TEXAS MEDICAL CENTER
Building Commissioning and HVAC Optimization Case Study
• Electricity savings: 2,151,166 kWh/yr
• Simple payback: 1.66 years
PROJECT FACTS AND STATS
•458,400 square feet
•10-story Medical Office Building built in2011
•CHW cooling and electric heating
•25 AHUs (SDVAV)
•EUI: 107 kBtu/sqft-yr
•LEED Gold and TOBY 2020 National Award
SCOPE OF WORK
•AHU commissioning and functional tests
•AHU control optimization
•OA flow verification and optimization
•Air-side economizer optimization
•Supply air temperature resets
•Duct static pressure resets
•Optimize AHU run schedules
•Optimize lighting system schedules
•Condenser water temperature setpoint reset
•Terminal boxes field commissioning and troubleshooting
DOBIE TWENTY 21
Student Living Spaces UT Campus, Austin.
Control Upgrade and HVAC Optimization Case Study
• Electricity savings: 900,600 kWh/yr
• Gas savings: 2,745 MMBtu/yr
PROJECT FACTS AND STATS
•247,372 square feet
•27-story student living units with retail spaces on lower floors
•2 chillers and 2 steam boilers
•Pneumatic controls
•24 AHUs (SDCV)
•EUI: 145 kBtu/sqft-yr
SCOPE OF WORK
•Complete control upgrade for central plant and AHUs from pneumatic to DDC
•Installed VFDs for all AHUs (224 hp), chilled water, and condenser water pumps (90 hp)
•Optimize staging sequence for chillers, chilled water pumps, and cooling tower fans
•Optimize hot water temperature setpoint based on weather and load conditions
•AHU commissioning and functional tests
•AHU control optimization such as night setback, single-zone units fan speed optimization, supply air temperature optimization, etc.
•Implement/optimize equipment run schedules
MAJOR HOSPITAL CHAIN IN NORTH TEXAS
Retro-Commissioning and HVAC Optimization Case Study
• Electricity savings: 45.4 million kWh/yr
• Gas savings: 224,000 MMBtu/yr
• Simple payback: 3.4 years
PROJECT FACTS AND STATS
•7 campuses, 9 hospitals, 10 central plants, 25buildings
•total floor area: 3.5 million square feet
•building ages: new to over 60 years old
•various building automation systems
•CHW cooling and HW heating
SCOPE OF WORK
•Install over 110 VFDs (nearly 3,000 hp) on the fan and pump motors
•Upgrade over 1,000 terminal units controllers from pneumatic to DDC
•Upgrade controls for two central plants
• Full-scale system re-commissioning and optimization for the entire HVAC systems
MEDICAL CENTER
Building Commissioning and HVAC Optimization Case Study
• Electricity savings: 1,390,510 kWh/yr
• Gas savings: 3,230 MMBtu/yr
• Simple payback: 1.26 years
PROJECT FACTS AND STATS
•280,000 square feet
•15-year-old hospital
•2 x 650-ton chillers with water-side free cooling capability
•15 AHUs (SDVAV or SDCV)
•EUI: 225 kBtu/sqft-yr
SCOPE OF WORK
•Install VFDs for cooling tower fans (2 x 25 hp) and replaced VFD for one chilled water pump (100 hp)
•Chilled water temperature reset, condenser water temperature reset, chilled water DP reset, hot water temperature, and DP reset
•Optimize staging sequence for chillers, chilled water pumps, and cooling tower fans
•AHU commissioning and functional tests
•AHU control optimization including OA flow, economizer, supply air temperature resets, and duct static pressure resets
•Implement/optimize equipment run schedules
•Terminal boxes flow optimization and setback operation where applicable
•ORs and other critical rooms flow and pressure control optimization
MEDICAL CENTER
LAKE POINT
Building Commissioning and HVAC Optimization Case Study
• Electricity savings: 2,159,374 kWh/yr
• Gas savings: 1,263 MMBtu/yr
• Simple payback: 1.61 years
PROJECT FACTS AND STATS
•268,850 square feet
•Old hospital with the brand new expansion
•3 x 300-ton water cooled chillers and 2air-cooled chillers in the new expansion
•19 AHUs (SDVAV or SDCV)
•EUI: 256 kBtu/sqft-yr
SCOPE OF WORK
•Install VFDs for cooling tower fans (3 x 20 hp) and condenser water pumps (4 x 25 hp)
•Upgrade three AHUs from pneumatic controls to DDC controls
•Upgrade OR controls in order to implement occupancy-based flow setback
•Implement chilled water/condenser water/hot water temperature resets and chilled water/hot water DP reset
•Optimize staging sequence for chillers, chilled water pumps, and cooling tower fans
•AHU commissioning and functional tests
•AHU control optimization including OA flow, economizer, supply air temperature resets, and duct static pressure resets
•Implement/optimize equipment run schedules
•Terminal boxes flow optimization and setback operation where applicable
•ORs and other critical rooms flow and pressure control optimization