2RW was contracted to develop a calibrated baseline energy simulation and parametric studies of proposed energy conservation measures (ECMs) for the United States Capitol in support of an Initial Proposal for an Energy Savings Performance Contract (ESPC). 2RW used the DOE-supported hour-by-hour energy simulation software, eQUEST in order to be consistent with work products previously developed by 2RW for similar submissions at the Senate Office Buildings and the Library of Congress. 2RW developed the simulations of the United States Capitol based upon building drawings and field work completed by other engineers
2RW’s client was selected to move forward with an ESPC and 2RW was contracted to develop the Detailed Energy Study (DES). The DES focused on optimizing the building automation system (BAS) by converting to direct digital controls (DDC) with energy saving sequences of operation. The ECM included comparative enthalpy economizer, demand control ventilation, elimination of simultaneous heating and cooling, temperature setpoint optimization, system scheduling for temperatures and ventilation, and conversion of systems from constant volume to variable volume. 2RW also conducted a feasibility study to convert much of the basement level of the building to geothermal heat pumps—a renewable energy source.
After extensive field observations and drawing reviews, 2RW developed a detailed energy simulation using Trane TRACE 700, another whole-building simulation software. A baseline simulation was created and calibrated using metered and logged data according to the Federal Energy Management Program’s (FEMP) Measurement and Verification Guidelines: M&V for Federal Energy Projects. The simulation reflected the current building operation, energy consumption and heating and cooling loads. The calibrated baseline simulation was then altered to incorporate recommended ECMs to determine the energy savings. The energy savings from the ECMs developed by 2RW were estimated to be $1.6 million per year.
During the implementation of the ESPC project, 2RW was contracted to provide design services for the implementation of electrical energy conservation measures. Additionally, 2RW performed peer reviews (design-phase commissioning) of drawings developed for the BAS optimization to ensure the intent of the energy conservation measures was preserved. 2RW served as the general contractor’s commissioning representative during the development of functional performance tests.
OWNER: Architect of the Capitol
TIMEFRAME: 2008 – 2015
SIZE: 557,000 SF
COST: $17 million
ESTIMATED ENERGY SAVINGS: $1.6 million/year