Energy Savings

Located 12 miles southwest of the Naval Air Station Patuxent River, the 1000-Acre Webster Outlying Field annex is home to the Naval Air Warfare Center Aircraft Division (NAWCAD) 4.5 and NAWCAD 5.1.11, Coast Guard Station St. Inigoes, and a component of the Maryland Army National Guard. In 2014, the U.S. Navy awarded CEG a federal ESPC project for Naval Air Station Patuxent River at the Webster Outlying Field Annex, a secure research facility and active airfield. CEG will upgrade 72 buildings across Webster Outlying Field and will implement five major energy conservation measures.

CEG will install new control systems and Ground Source Heat Pumps to replace existing oil-fired boilers and air source chillers in five of the largest buildings at the base. Across the base, CEG will upgrade the interior and exterior lighting, building controls, domestic water fixtures, and building envelopes.

The ground breaking project was expected to reduce energy consumption in the Webster Outlying Field retrofit buildings by 38% and generate over $875,000 of annual utility and maintenance savings in the first year of performance. These energy savings will help the Navy achieve its goal or reducing total energy consumption and providing improved energy security. The project will also reduce carbon dioxide emissions by over 5 million pounds per year, by largely eliminating use of fuel oil at the base. This is equivalent to the average annual emission from 536 passenger vehicles or 232 homes. Many of the buildings included in the scope contain secure laboratories and testing spaces, mechanical and repair shops, and industrial facilities. CEG has worked closely with the Navy to develop safety and implementation plans. It will ensure that safety requirements are met and implementation does not interfere with building occupants or mission requirements. CEG also worked closely with the Navy to develop a custom approach to O&M and R&R for each individual ECM that ensures continued performance of all ECMs while also controlling costs for the project. Due to the US militaries commitment to reducing the operating costs of its installations, they have undergone the first phase of facilities upgrades at the navy air base.

The initial project called for competitor’s simultaneous units however, after reviewing the performance of the competitor’s product and the Aermec units, the decision was simple. The competitor’s units could reduce energy usage drastically but the Aermec NXP simultaneous water source units provided even greater savings in the short run and long run performance. The energy models were run in E-quest models to compare energy usage. First phase of upgrades includes:

1.5 buildings
2.5 NXP units totaling 400 tons
3.3 new geothermal field installations-vertical bore holes with over 24,000 feet of pipe in the ground
To satisfy the buildings loads, we sized NXP machines to handle all the heating they will ever need. The NXP machines limits in cooling were augmented by Aermec water to water NXW units to handle peak cooling loads when the NXP machines cannot carry the entire load.