Retro-Commissioning

Davenergy Solutions currently holds a multi-year Indefinite Delivery Indefinite Quantity contract with the Veteran Affairs to conduct Third Party Commissioning of Solar Photovoltaic Systems, Combined Heat and Power Plants and Ground Source Heat Pumps. Numerous Task Orders have been issued and Davenergy is working at nearly 30 VA hospitals ranging from Florida to Hawaii, with the most recent award of a 5 MW Solar PV System at VAMC North Las Vegas.

VISN 18 Retro-Commissioning Services, Department of Veterans Affairs

Davenergy provided retro-commissioning for seven VISN 18 Medical Centers (5,036,000 sf) establishing and altering Heating, Ventilation, Air Conditioning (HVAC) and related energy-using systems to optimal operational capabilities located in Arizona, NEw Mexico and Texas. Services included contract and project management customer interaction, coordination, quality assurance and oversight for the retro-commissioning services performed by key subcontractors. Davenergy identified $1.4M and 60,000 MMBTUs of annual savings by implementing $3.4M of recommended measures, with a simple payback of 2.4 years. Recommended Corrective Actions and ECMs included implementation of variable Chilled Water and Condenser Temperature setpoints, optimizing economizer routine on AHUs, Chiller Plant Sequence of Operations, Thermal Energy Storage system schedules and reducing of Supply Fan speeds.

VISN 19 Retro-Commissioning Services, Department of Veterans Affairs

Davenergy provided retro-commissioning services for three VA Medical Centers in Oklahoma (1,466,000 sf) for the purpose of establishing and altering Heating, Ventilation, Air Conditioning (HVAC) and related energy-using systems to proper operational capabilities. Davenergy provided program/project management, quality assurance and oversight for the retro-commissioning services. Davenergy’s project management included customer interaction and coordination, both with the contracting office and the field sites as well as the management of Davenergy engineers from site visits to the final deliverable.

VISN 20 Retro-Commissioning Services, Department of Veterans Affairs

Davenergy provided retro-commissioning services for the recently constructed 248,000 square foot Anchorage Alaska Outpatient Clinic for the purpose of establishing and altering Heating, Ventilation, Air Conditioning (HVAC) and related energy-using systems to proper operational capabilities. The retro-commissioning process used a systematic and documented process that identified operational and maintenance improvements to bring the site up to the design intentions of its current usage. Recommendations made are expected to have a payback period of less than a year and will save an estimated 260,476 kWh and $27,350 every year. A small sample of recommended Corrective Actions and ECMs included rescheduling of Supply and Return Fans operation, replacing Pre-heat coils on Air Handlers, using multiple thermostats to balance temperatures, reducing load on Glycol loop, changing coil capacities, investigating compressed air system for leaks, and installing ambient lighting sensors.

VISN 22 Retro-Commissioning Services, Department Veterans Affairs

Davenergy provided retro-commissioning services for six VA Desert Pacific Health Care Network Medical Centers (9,505,000 sf) for the purpose of establishing and altering Heating, Ventilation, Air Conditioning (HVAC) and related energy-using systems to proper operational capabilities. Services included direct retro-commissioning services at VAMC West LA. For the remaining sites, Davenergy provided program/project management, quality assurance and oversight for the RCx services performed by key subcontractors. Davenergy’s project management included customer interaction and coordination, both with the contracting office and the field sites, as well as the management of Davenergy and subcontractor engineers that contributed to the final deliverable. Identified measures for the six sites, if implemented, are expected to save over 11,000 MWh of energy and $1.6 M every year. The cost of these measures totals $9.4M. A small sample of recommended Corrective Actions and ECMs included optimization of central plant operations, implementation of supply air temperature reset control strategy, repair of steam leaks, implementing economizer control strategy, restoration of BAS control for proper operation of equipment, implementation of unoccupied setbacks for appropriate spaces and elimination of simultaneous heating and cooling.

Retro-Commissioning Services, USDA ARS Western Human Nutrition Research Ctr, Davis, CA

Davenergy conducted retro-commissioning and prioritized cost effective energy and water efficiency measures of 4,000,000 square feet in existing buildings, totaling 60 buildings. ASHREA Level 2 Energy Audits were also required. The purpose of the retro-commissioning program was to assist USDA in optimizing the operation of Heating, Ventilating and Air‐Conditioning (HVAC) systems for reducing energy costs and bringing equipment to its proper operational state. Davenergy completed a detailed investigation of the building HVAC systems, including functional tests of equipment and control systems, analysis of available Building Automation System (BAS) trend data provided, As-Built mechanical plans for the building, and As-Built BAS Sequence of Operations specifications. Davenergy identified energy conservation measures for NBSD resulted in 5,775 MMBtu, 249 kW, and $152,852 annual savings in energy usage and cost. This is a 13% reduction in energy consumption and a 10% reduction in cost for the buildings serviced.

U.S. Coast Guard TRACEN Petaluma, CA

Davenergy conducted detailed ASHRAE Level 2 Energy Audits, Retro-Commissioning and comprehensive energy services for the U.S. Coast Guard TRACEN Petaluma on 21 mission buildings ranging from 10,000 SF to 100,000 SF, for a combined total of 575,000 SF, including 1 medical building of 16,000 SF. Addit ionally it included 127 residential units totaling 640,000 SF.  The program provided simple repairs that were completed as part of the contract as well as cost effective improvements that could be later implemented.