Replace Heat Exchangers - 663 and 664

This project will address issues with the domestic hot water system in both residence buildings by redesigning the DHW system architecture to include a step-down heat exchanger where HTHW is first converted to medium temperature hot water in an intermediary loop and then further converted to DHW utilizing the existing DHW heat exchanger. Currently, high temperature hot water is converted to domestic hot water through a single shell-and-tube heat exchanger. Due to the extreme temperature differentials between the HTHW and the DHW, and the incoming HTHW pressure and flows, the existing heat exchangers have failed multiple times over the past few years. The Division 03 Heating contractor will be responsible for coordinating this project and providing supporting plumbing and electrical divisions or work. A new shell-and-tube water-to-water HX will be shall be provided and installed, along with new secondary variable pumps, and a connection made to existing vertical shell-and-tube water-to-water DHW heat exchangers. In additional to heating, plumbing, and electrical work, this project will also require upgrades to the building automation system for the new equipment and system operations. All responses must include: There is a 30 percent BEP goal for this procurement. See solicitation documentation for details. There is a 3 percent Veteran-owned business goal for this procurement. See solicitation documentation for details. The contract(s) for this solicitation could exceed $50,000 annually. Marie Robinson Hall 811 W Maxwell St Chicago, IL 60607 Thomas Beckham Hall 1250 S Halsted St Chicago, IL 60607

Division 23 -

Heating, Ventilating, and Air Conditioning (HVAC), Instrumentation and Control for HVAC, HVAC Air Distribution, Central HVAC Equipment.