Prince William County Public Schools

Guaranteed Energy Savings Contract

This project is a Guaranteed Energy Savings Contract for Prince William County Schools (PWCS), the second largest school system in Virginia. This is the first phase of a multi-phased project extending through 2027.

The first phase involves a critical system replacement for Bel Air Elementary School, involving a range of measures that will replace the existing aging HVAC infrastructure with new systems.Bel Air Elementary School currently has an EUI of 90 and indoor air quality concerns. CMTA’s upgrades will turn the 49,800 square foot Bel Air ES into PWCS’ first net zero ready school.

The scope for Phase 1 includes the replacement of the HVAC system with a full geothermal and dedicated outside air system to meet current ventilation standards, significantly improve system efficiency, and mitigate building humidity concerns. The scope of work includes:

  • Demolish existing chiller plant
  • Remove existing rooftop air handling unit, make-up air unit and exhaust fans, unit ventilators, ceiling cassettes, electric unit heaters and ductless split systems
  • Provide a geothermal wellfield with vertical wells, geothermal vault housing isolation vaults, and horizontal distribution piping
  • Provide new geothermal water pumps with variable speed drives, expansion tank, air separator and water treament; new classroom heat pumps, 3 new dedicated outside air units, energy recovery ventilator, geothermal heat pump rooftop unit, vertical heat pumps, horizontal heat pumps, console heat pumps, and kitchen hood make-up air unit
  • Demolish existing controls system
  • Provide new web-based direct digital controls system and integrate into existing energy management systemImplement new control sequences, including optimized building schedules and zone/equipment setbacks
  • Replace ceiling tiles, grid and wall angles
  • Replace damaged/missing exterior door weather stripping and sweeps on all exterior doors, and insulate roof/wall seams with spray foam