Energy Audits & Reporting

Architect of the Capitol Washington D.C.

Projects

Overview

The central heat plant contains seven boilers. Boilers 1,2, and 3 are coal boilers, converted to also burn gas/oil, rated for 150,000 lbs/hr each. Boilers 4,5,6, and 7 burn gas/oil and are each rated at 60,000 lbs/hr. Currently, the peak steam load on the plant is approximately 315,000 lbs/hr. We evaluated the steam generation and distribution system to maximize the efficiency of the system. We made recommendations (and subsequently implemented) significant measures to conserve energy. As part of this study, we prepared energy models for the central heating plant, distribution systems, and campus buildings.

The Office of the Architect of the Capitol (AOC) is responsible for 17.4 million square feet of facilities on Capitol Hill in Washington, D.C., as well as support facilities in Maryland and Virginia. These include the U.S. Capitol Building, the U.S. Senate Office Buildings, the U.S. House of Representatives Office Buildings, the U.S. Supreme Court, the Library of Congress buildings and grounds, the U.S. Botanic Garden facilities, the Capitol Power Plant, the Capitol Grounds, as well as the U.S. Capitol Police security facilities. We have been proudly assisting the AOC with many of their energy initiatives, see the details below for a brief overview of some projects.

Solution Details

Annual Energy Report:
Congress passed the Energy Policy Act of 2005, which was signed into law by President Bush on August 8, 2005, requiring that the AOC submit an Annual Report on Congressional energy management, water management, and conservation programs. We prepared the Comprehensive Energy and Water Management Conservation Reports to Congress over multiple years.

Annual Energy Plan:
We prepared the comprehensive Energy Plans that were submitted to Congress. The plans outlined initiatives the AOC developed, integrated with their Capital Improvement Plan and Deferred Maintenance, to meet 15% energy consumption reduction goals under the Energy Policy Act of 2005.

Comprehensive Energy Audits:
We conducted energy audits of the AOC’s facilities in Washington, DC, Maryland, and Virginia. The AOC opted to perform ASHRAE Level 3 audits, seeking to develop investment grade, capital intensive Energy Conservation Measures (ECMs). Significant Audit recommendations included:

U.S. Capitol Building:
This iconic 843,600 square foot building poses a unique challenge to integrate energy savings into its historic fabric. Entech recommended controls, HVAC, and lighting improvements that offered a significant opportunity to reduce annual energy consumption.

U.S. Senate Office Buildings:
We conducted energy audits in the three main office buildings on Capitol Hill and several smaller ancillary buildings, totaling 2,781,683 square feet. The audit included potential HVAC, lighting, and water ECMs to reduce the annual energy consumption for the facilities.

U.S. House Office Buildings:
With six buildings, totaling 5,124,977 square feet, the energy audit included the analysis of architectural, mechanical, plumbing, and electrical systems by a team of Entech engineers. ECMs were developed and models used to estimate associated annual energy savings resulting in a reduction of annual energy use.

Library of Congress:
We conducted energy audits in four major library and collections buildings totaling 783,233 square feet. Recommendations included utility systems, building envelope, HVAC, lighting, plumbing, water, BAS / EMS system improvements.

Capitol Power Plant:
The Capitol's chilled water plant has a total capacity of 40,200 tons and serves the cooling needs of Capitol Hill. Several ECMs, with paybacks of less than five years were recommended, including conversion to variable primary distribution, no-cost operational improvements, free cooling improvements, and variable frequency drives on the condenser water pumps. Recommended ECMs are projected to reduce annual operating costs by approximately $2 million.

The central heat plant contains seven boilers. Boilers 1,2, and 3 are coal boilers, converted to also burn gas/oil, rated for 150,000 lbs/hr each. Boilers 4,5,6, and 7 burn gas/oil and are each rated at 60,000 lbs/hr. Currently, the peak steam load on the plant is approximately 315,000 lbs/hr. We evaluated the steam generation and distribution system to maximize the efficiency of the system. We made recommendations (and subsequently implemented) significant measures to conserve energy. As part of this study, we prepared energy models for the central heating plant, distribution systems, and campus buildings.

U.S. Capitol Police:
We surveyed five buildings totaling 500,000 square feet. The audit included developing HVAC and lighting models to simulate building energy use and cost. 24 energy conservation measures were recommended.

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