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Investigation and Design of Heating and Cooling System Process & Distribution Facility, USPS

Charleston, South Carolina

Market Sector



Energy and Environmental

Services Provided

Mechanical and Electrical Engineering/ESD, Seismic Analysis and Design, Program Management, Planning, Design, Architecture



T.Y. Lin International (TYLI) provided engineering and project management services for the study and redesign of the heating and cooling system for the United States Postal Service Process & Distribution Facility in Charleston, South Carolina.

The project for the 203,175-square-foot facility was part of a larger Indefinite Delivery Contract with the USPS, and was split into multiple phases. Phase One was a study and Energy Efficiency Report. Phase Two was construction administration services for the installation of new electric resistance heat coils. Phase Three was a study of the HVAC controls. Phase Four was the development of plans and specifications for the HVAC controls and Systems upgrades.

Project Highlights:

  • In Phase One, TYLI prepared an Energy Efficiency Report for the heating system in the large mail sorting room. The room was originally illuminated by large, overhead high-intensity discharge lighting that provided heat for the space. The study recommended installing new, more energy-efficient electric resistance heat coils in the workroom’s air handling units, the enclosed mail platforms, and ancillary spaces between workroom and platforms.
  • In Phase Two, TYLI provided construction administration services for the installation of the new electric resistance heat coils. The project team conducted four onsite inspections during construction, a pre-final inspection, and the final inspection.
  • In Phase Three, TYLI investigated the heating, ventilation, and air conditioning (HVAC) controls for the units, evaluating the feasibility of repair/upgrade versus a total replacement.
  • In Phase Four, plans and specifications were developed by the TYLI team for the HVAC Controls and Systems Upgrades. These included the replacement of three air handles, the upgrade of the HVAC controls, and the removal of three chillers/cooling towers, which were replaced with two new chillers/cooling towers.
  • The measurement and verification portion of the work included 10 to 12 month utility load calculations and completed energy form submittals during the 30% design phase.