GMI was contracted to conduct an Investment Grade Energy & Water Audit at Cape Canaveral Air Force Station in Florida. The energy & water audit included 42 buildings totaling 1.3 million ft2. GMI identified 30 ECMs (Energy Conservations Measures) in 39 buildings. These ECMs were estimated to annually save 4,450,000 kWh of electricity, 203,000 therms of natural gas, and 4,000 kGal of water. These energy and water savings yielded $678,600 of annual cost savings with an estimated total implementation cost of $3,045,000 and a total simple payback of 4.5 years. The ECMs included dehumidification system upgrades, HVAC controls retro-commissioning, and lighting retro-fits.

Completed February 2011

GMI was contracted to conduct a Comprehensive Energy Audit for the Knoxville Utility Board Hoskins Operation Center. The audit consisted of 6 buildings totaling 415,000 ft2. GMI identified 11 ECMs (Energy Conservation Measures) in the six buildings. These ECMs were estimated to save 2,960,000 kWh of electricity (51% reduction) and 61,100 therms of natural gas (75% reduction) annually. The ECMs had a total estimated implementation cost of $1.9 million and were projected to save $232,000 in energy cost savings annually which resulted in a total simple payback of 8.3 years. The recommended ECMs included retrofitting multi-zone and dual duct air handlers to VAV systems and replacing warehouse heating systems with gas-fired infrared heat.

Completed April 2010

GMI performed energy & water evaluations for four buildings totaling over 4 million ft2 in Chicago, Illinois. GMI personnel conducted a comprehensive site survey to evaluate potential energy and water conservation measures. The energy savings associated with each potential conservation measure was calculated by creating energy models using DOE-2 energy simulation software (eQuest). Based on the analysis, GMI identified and recommended 15 ECMs (energy conservation measures) with an implementation cost of $19 million to achieve $3.2 million in annual energy cost savings. This gave the total project a simple payback of 6.3 years and made the building eligible for Energy Star certification.

Completed June 2009

GMI performed an energy audit on 33 buildings (~3,000,000 ft2) at the Port Authority of San Antonio, TX. This included 4 central utility plants (chilled water & steam) operated by San Antonio Water System (SAWS). GMI revealed that converting to stand-alone building heating systems (instead of using the central steam plant) would result in $930,000 in annual cost savings with a simple payback less than 5 years. Energy Conservation Measures (ECMs) evaluated for the SAWS district chilled water plants included installing variable-speed drives and converting the present CHW loop to a variable primary configuration. Twenty-three building specific ECMs were also recommended that could be implemented at a cost of $545,596 to achieve $185,357 in annual energy cost savings with a total project simple payback of 2.9 years.

Based on the findings of this energy audit, Port Authority of San Antonio chose to move forward with the recommendations presented in the Heating System Analysis and selected GMI to serve as the design/build contractor for this project.

Completed April 2006

GMI was contracted by the Air National Guard to perform a test and balance and retro-commissioning on HVAC systems for five buildings (130,000 ft2) at Peoria ANG Base, Illinois. GMI measured air flow for all supply, return, and exhaust diffusers to ensure that spaces received sufficient air flow for temperature control, pressurization, and ventilation. Additionally GMI personnel reprogrammed control sequences for air handlers, cleaned outside air intakes, programmed temperature resets for hot water loop, scheduled zone temperature setbacks, calibrated VAV box controls, and replaced a faulty chilled water valve stem. GMI projected $42,000 of annual utility cost savings with the retro-commissioning services complete.

Completed April 2011

GMI was contracted by the Air National Guard to perform a test and balance and retro-commissioning on HVAC systems for seven buildings (167,000 ft2) at Des Moines ANG Base, Iowa. GMI performed a test and balance on all air-side HVAC systems. Retro-commissioning services included programming outside air temperature resets for hot water and chilled water loops, programming temperature setbacks for unoccupied hours, reassembling a non-functional preheat coil, cleaning return grilles to allow proper air flow, reassembling linkages on outside air louvers, and the replacement of non-functional VAV actuators. GMI also installed programmable thermostats, replaced a damaged exhaust fan, and installed return ductwork for a system that had a return plenum that was not properly sealed. GMI projected $32,700 of annual utility cost savings with the retro-commissioning services complete.

Completed March 2011