The project was the first Energy Savings Performance Contract (ESPC) executed at a Smithsonian Institution museum. It incorporated other energy efficiency improvements including a domestic hot water system upgrade, upgrade of approximately 15,000 lighting fixtures, and energy-saving alterations to the chiller plant and major air-handling systems in the National Museum of Natural History.
Addressing a known and important infrastructure need helped secure internal support and fast approvals for the project, which contributes significantly to meeting energy and environmental goals.
Multiple elements of the project and SI facilities management practices address quality control and help ensure that new systems will perform as expected.
The National Museum of American History closed to the public on September 5, 2006 for major architectural renovations.
To make a project that would be entirely self-funded through guaranteed savings, and help offset the high initial cost of the new chiller plant, more rapid-payback projects were needed. The team investigated and identified additional projects including energy efficiency upgrades of approximately 15,000 lighting fixtures, and energy-saving alterations to the chiller plant and major air-handling systems in the National Museum of Natural History.
In April 2008, new cooling towers, pumps and the first of four new chillers were in service. By June 2008, all four new chillers were in service and the plant was capable of meeting current and anticipated cooling loads.
The new chiller plant is designed with redundancy and other features to provide higher reliability than the old chiller plant. It allowed the removal and disposal of more than 8,000 lbs. of obsolete, ozone-depleting refrigerants, which were used in the old chillers. It provides 3,000 tons of cooling capacity to accommodate existing and anticipated cooling loads in the museum. High-efficiency features include a chiller with a variable speed motor controller, variable-flow primary chilled water pumping, and free-cooling capability using cooling towers and a heat exchanger.
Lighting upgrades in the project included special lamps selected to reduce exposure of sensitive collection materials to damaging ultraviolet radiation.
By June 2009, implementation was complete on the full scope of the project at both the National Museum of American History and the National Museum of Natural History.
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