Chilled Water Plant Optimization Cuts Hospital’s Annual Energy Costs 30%
Performance contract enables hospital to recover lost cooling capacity and cut costs 30% with tekWorx innovative hydronic design and adaptive control strategy.
Facility Bio
- Rockville, MD
- 313 bed hospital with Acute Care Center
- 500,000 ft² facility
- Four (4) Trane chillers
- 3,700 tons installed cooling capacity
Situation
- Healthcare system energy reduction initiative for all sites
- Primary-Secondary-Tertiary system with inherent inefficiencies
- High system pressure
- Low CHW ΔT
- High kW/ton
- Ineffective building pump control required manual intervention
- Andover BAS with standard sequence, no optimization
Solution
- Convert plant to Integrated Primary-Secondary® design to eliminate bypass low and blending, raise ΔT
- Install VFDs on 3 of 6 primary CHW pumps
- Control tertiary pumps to reduce system pressure and wasted energy
- Install adaptive Control Engine Optimization® solution to continuously minimize kW/ton
Results That Exceed Client Expectations
Financial Savings
- $140,000 utility rebate
- $87,400 in annual energy savings
Energy Impact
- 760,000 kWh saved annually
- .31 kW/ton energy efficiency improvement
Operational Benefits
- System experiences much less wear and tear
- Reduced manual intervention
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