David Broustis

21-Jun-2018, 3:30 - 4:00PM

Marymoor Park Maintenance Facility Net-Zero Retrofit

David Broustis

Energy Manager
King County

The Marymoor Park Maintenance facility net zero project highlights how an existing facility can be retrofitted with high efficiency mechanical and lighting equipment, and rooftop photovoltaics (PV), to create a net zero energy facility.While reaching net zero energy use is becoming more common in new construction, reaching the milestone in a facility never designed for such a designation is more challenging, yet achievable.The 5,412 square foot two-building maintenance complex was constructed in 2006.The site includes a 2,760 sq. ft. office/shop, a 2,652 sq. ft. maintenance “hangar”, and a vehicle and equipment storage yard.The pre-project EUI at the facility was 29 kBTU/sq. ft.

The project originated during an effort to identify King County government buildings with solar generation potential.After determining the facility had good orientation for PV generation, analysis of the energy bills revealed that a zero energy goal could be met, if deep savings could be achieved by reducing lighting, heating and cooling energy use.The integration of new, high efficiency technologies was essential for fitting the energy use within the rooftop PV generation budget.The energy-using systems were analyzed to identify the most efficient and cost effective options, resulting in a new efficient office/break room mini-split heating system to replace wall heaters and window air conditioning, and state-of-the-art indoor/outdoor LED lighting that weren’t available during the 2006 construction.

This project demonstrates that net zero facilities are not only built from the ground up but can also be established in existing facilities, when roofs offer good solar orientation and sufficient surface area. The ability to transform existing maintenance shops and other facilities to zero energy facilities through the utilization of cutting-edge efficiency technologies and cost effective PV offers significant potential for other similar facilities across the world.












Track: 2- High Performance & Green Buildings | Session: 2C- Case Studies: Getting to Green(er) Pastures

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