A hospital was among winners of the 2013 ASHRAE Technology Awards, which recognize outstanding achievements in applying innovative building design.
Their designs incorporate ASHRAE standards for effective energy management and indoor air quality. The awards also communicate innovative systems design to other ASHRAE members and highlight technological achievements of members to others around the world. Winning projects are selected from entries earning regional awards.
Jeremy McClanathan, ASHRAE-certified building energy modeling and healthcare facility design professional, CDi Engineers, Lynnwood, Wash., received first place in the new healthcare facilities category for the Swedish Issaquah Hospital, Issaquah, Wash. The owner is Swedish Health System.
The new hospital includes an emergency department, operating rooms, imaging, cardiology, and in-patient rooms. Through innovative design, the building was able to achieve a 54% energy savings compared to a baseline EUI 250 kBtu/sf/year for a typical hospital.
Efficiency measures include a central plant heat recovery system (HRS); the use of variable air volume (VAV) air systems; re-circulating air handling units (AHU) with select units 100% outside air capable for pandemic mode; low-velocity ductwork, high-efficiency AHUs and chillers; and efficient envelope and lighting.
The most innovative efficiency measure employed in the project, according to ASHRAE, was the central plant HRS that is estimated to provide approximately 80% of the building’s heating and domestic hot water with energy recovered from internal loads. It utilizes a centralized heat pump, advanced controls, heat recovery coils and a series of heat exchangers to move heat from the chilled water system to the hot water systems. In order to maintain the required pressure relationships mandated in hospitals for infection control, the building utilizes return and exhaust air tracking terminal units and venture valves in its ventilation system. This allows central AHUs to vary supply airflow rates based on demand.
Carbon emissions for the building are 47% lower than a baseline building, reducing 6,513 tons of carbon emissions each year. Additionally, the plumbing fixtures, selected to provide both water and energy savings, save 30 percent and 50 percent of the water used by standard fixtures.The building was able to achieve a 54% energy savings