25% electrical reduction per month
Challenge
Subpar pressure control
- Medium-rise commercial building application with occupancy scheduling
- Stack effect issues and cold lobby temperatures in winter
- Relatively energy-efficient building with limited opportunity for savings
- Vintage AHU controllers required replacement
Approach
Partnering to enhance performance
- Pathian® provided project development, engineering, and commissioning services
- Installed new building pressure sensors in the lobby and 11th floor elevators
- Replaced controllers on 4 major AHU’s
- Installed minimum outdoor airflow stations on each AHU
- Reprogrammed AHU’s using Pathian Optimal Building Pressure Control (POBPC)
Results
Comfort and savings in spades
- Total project cost: $60,000
- Estimated project savings:
- $14,700 in electric (153,000 kWh/yr @ $0.096 per kWh)
- $5,030 in natural gas (966 MCF/yr @ $5.21 per MCF)
- Simple Payback: 3.0 years
- Maintained positive pressure in lobby throughout winter for improved comfort
- Reduced Site Energy Use Intensity (EUI) from 80 kBtu/sf to 74 kBtu/sf
- Weather normalized analytics show electrical actual reduction of 25% per month
Other industries
Industry
Commercial
Location
Dearborn, Michigan
Building Facts
Office building
Built in 1989
335,940 sf
11 stories (165 ft)
500+ employees
The difference Pathian made in our facility was immediate and dramatic.
– Commercial Engineering Manager