Miller Park, Retro-Commissioning - Milwaukee
GBA worked with the Milwaukee Brewers, the Southeast Wisconsin Professional Baseball Park District, and the Johnson Controls-Stadium Operations staff to retro-commission Miller Park, home to the Milwaukee Brewers, as a part of the LEED Existing Buildings: Operations & Maintenance (EBOM) certification process..
GBA assisted Johnson Controls and the Milwaukee Brewers in achieving LEED EBOM certification. Miller Park was the third sports stadium and first venue with a retractable roof to achieve this certification.
- Testing of air-handling units revealed many systems operating well above the original design airflow values. GBA provided an ASHRAE 62.1 ventilation analysis, and systems were rebalanced to appropriate levels.
- Game-day operation of mechanical systems was longer than required. GBA recommended revised system operating schedules. In addition, several units were added to the game-day schedule to reduce their operating hours.
- AHU dry-bulb economizer controls were set to 55°F. GBA recommended increasing the changeover setpoint to 65°F to save cooling energy.
- Static pressure setpoints on several variable air volume systems and differential pressure setpoints on secondary hot water and chilled water pumps were higher than required. GBA recommended reducing the setpoints to save fan and pump energy.
- Demand-controlled ventilation was added for several air-handling systems with exhaust-driven ventilation requirements to reduce energy use.
- Reductions in outdoor air cooling requirements reduced the central plant cooling load by almost 100 tons, which will improve fan comfort in air conditioned areas on game days.
- Facility Improvement Measures implemented during retro-commissioning will save approximately 1 million kWh, 43,000 therms, and $130,000 annually, with a simple payback of less than one year. Miller Park’s CO2 emissions were reduced by approximately 2.3 million pounds per year, the equivalent of taking 220 cars off the road for a year.
- A portion of the funding was provided through the Wisconsin Focus on Energy Retro-Commissioning program.