Government Facility Retrofit – Energy

Sector: Government Facility Year: 2016 City: Béthune, France Gross Floor Area (GFA): 2,100 sqm Total Cost: €4.6 million Scope of the Mission: Energy Project Management (~3 years: Program, Design, Construction, Commissioning, Occupancy, Maintenance)

Comprehensive retrofit of a government facility under HQE standards with RTex compliance, combining external and internal insulation, high-performance glazing, advanced lighting controls, and modernized HVAC systems. The project integrated CO₂-controlled ventilation and robust energy & water monitoring to maintain performance post-commissioning.

Detailed Assessment
  • HQE approach with RTex retrofitting compliance.
  • External + internal insulation and double-glazed windows.
  • LED lighting with dimming system for adaptive control.
  • Airtightness objective: Q4 < 1.7 m³/m²·h.
Performance Evaluation
  • Seasonal efficiency review of condensing boiler operation.
  • Verification of CO₂-based fresh air intake modulation.
  • Heat recovery efficiency >80% on dual-flow AHU.
Diagnostic Testing
  • Balancing and control sequence testing of radiator circuits.
  • Functional testing of lighting dimming control.
  • Air tightness testing and verification of envelope integrity.
Maintenance Review
  • Preventive maintenance plan for HVAC and lighting systems.
  • Operator training for CO₂-control and system monitoring.
  • Creation of an updated asset register with performance benchmarks.
System Optimization
  • Refined control logic for radiator and AHU operation.
  • Energy & water consumption tracking with automated reporting.
  • Seasonal adjustment of system setpoints to minimize waste.
Efficiency Improvement
  • LED dimming schedule optimization based on daylight availability.
  • Improved fresh-air modulation to balance IAQ and energy use.
  • Roadmap for ongoing incremental retrofit measures.

Result: modernized government facility with optimized heating, ventilation, and lighting systems, delivering improved comfort, reduced operational costs, and long-term energy efficiency.