Energy – Case Study 1

MULTIPLE ENERGY RECOVERY SYSTEMS SERVING R&D FACILITY
– North Carolina (RTP Area)


Client Need

Energy-Case-Study-1-Photo

As part of our design of a 14,600 SF renovation project for this North Carolina based R&D facility we were directed to design and integrate energy recovery systems to reduce size of major equipment, their associated components, and overall operating costs of the facility. This was accomplished utilizing two different systems.

  1. A custom 25,000 CFM make-up air handling unit utilizing a side by side refrigerant energy recovery coil designed to recover energy from the lab exhaust air system and preheat the outdoor air entering the make-up air handling unit.
  2. A 1,450 CFM energy recovery ventilator designed to recover energy from the general exhaust air system and pre-heat the make-up air portion of the recirculation air handling unit.

Design Features

  • Full sequence of operations for all new equipment including all interface points with existing equipment and systems.
  • 25,000 CFM custom refrigerant energy recovery coil incorporated into new custom make-up air handling unit.
  • Refrigerant cycle reverses during heating/cooling season. Run around coil requires no receivers, pumps or controls and functions independent of all other systems. No energy or controls required to operate system.
  • Full by-pass around energy recovery coils (make-up and exhaust) to optimize efficiency through an economizer mode. Ability for partial by-pass (modulating dampers) incorporated into the sequence of operations to allow for partial recovery when practical. Damper control based on outdoor air enthalpy and discharge air temperature setpoints, both of which are adjustable.
  • 1,450 CFM Energy Recovery Ventilator provided make-up air component of new recirculation air handling unit.

Design Benefits

  • Make-up air handling unit with fully integrated energy recovery system provided year round operational energy savings with a total load reduction of 868 MBH (254 kw) wintertime and 134 MBH (11 tons) summertime.
  • Air handling unit with energy recovery ventilator serving make-up air component provided year round operational energy savings with a total load reduction of 61 MBH (18 kW) wintertime and 54 MBH (4.5 tons) summertime.
  • Significantly reduce size and capacity of new make-up air and air handling components and reduce overall operating costs.
  • Significantly reduce size and capacity of new air cooled scroll chillers and reduce overall operating costs.