Energy and Water Assessments
Location: NAVSTA Norfolk
Owner: U.S. Navy
SEA was contracted to perform an ASHRAE level II energy assessment for Naval Station Norfolk (NS Norfolk). The assessment consisted of an on-site facility survey of 69 buildings, and energy and economic analysis of selected energy conservation measures (ECMs). This assessment was performed in an effort to identify energy-related projects with potential savings and methods of execution enabling NS Norfolk to better meet energy reduction requirements in compliance with the Energy Independence and Security Act of 2007 (EISA 2007).
SEA evaluated a variety of buildings including office buildings, a commissary (food sales), restaurants (food service), a bowling alley, a religious facility, police and fire stations, warehouses, lodging/hotels, workshops, medical clinics, laboratories, schools, and an airport terminal. Because of the variety of buildings, SEA evaluated a large number of energy conservation measures (ECMs).
One of the most lucrative ECMs was an ECM for converting pneumatic controls to direct digital controls (DDC). This ECM would replace central station air handling units (AHUs) configured with pneumatic controls with DDC programmable controllers. This upgrade would include integration of HVAC production equipment (chillers, boilers, and pumps) for unoccupied control of the buildings. The buildings where this ECM was most lucrative were buildings that were unoccupied during long periods of time (such as an office area with an 8-10 hour workday) because the equipment could save a considerable amount of energy during the unoccupied times.
Another ECM with a short simple payback was to upgrade boiler controls in multiple buildings. The ECM would replace mechanical linkage control of gas valve and air damper with a microprocessor controller maintaining consistent fuel-to-air ratios over the full firing range with increased modulation capabilities. Several older boilers have mechanical linkages controlling the gas valve, and this linkage wears over time causing it to function less efficiently. The microprocessor controller adjusts the fuel-to-air ratio to make the boiler overall more efficient and does not have the same wear as the mechanical linkage.