Central Heating Cooling Plant Upgrade

In the heating and cooling plant, the three existing 1,000 ton (3,516 kWf), CFC-based electric chillers, cooling towers, pumps, and ancillary equipment were all decommissioned. Designed to meet the reduced load requirements, the new central plant consists of two double-effect, dual-fuel chiller/heaters that provide a combined output of 994 tons (3,494 kWf) of chilled water and 10 million Btu (2,950 kWhh) of hot water. The cooling and heating capacity was selected after careful consideration of the baseline conditions, which were capacity constrained under peak temperature conditions, and the interactive effect of all of the other technology applications included in the project, most notably the reduced outside air requirement, which dramatically reduced peak capacity requirements. The existing cooling tower was dis mantled and removed from the site and a new low-profile unit was installed on the roof.

The steam distribution and end-use systems were converted to a hydronic system. The steam boilers were then removed and hot water is now generated by the absorption chiller/heaters and a small auxiliary boiler. The existing fuel oil tank was left intact outside the boiler room. The tank serves as a backup for the absorption chiller/heaters, which use natural gas as the primary fuel, and for the emergency generator.

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