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Mary Greeley Medical Center Central Energy Plant


Mary Greeley Medical Center was undergoing a 280,000-square-foot addition to accommodate its constant growth and better serve the healthcare needs of central Iowans.

As the hospital grew bigger, a new central plant was needed to provide efficient heating and cooling across the medical campus. Mary Greeley Medical Center wanted to make sure the equipment in its central plant had redundancy so that patients and staff would have uninterrupted heating and cooling. Different electrical substations for distribution points were also desired for this reason.


A new central plant for heating, cooling, and power equipment was designed by Shive-Hattery to serve the entire hospital, including the new addition.

Central plant heating equipment includes four dual-fuel, high-pressure steam boilers; a deaerator; feedwater pumps; steam-to-water heat exchangers; boiler stack heat recovery systems; variable speed drives on heating water system pumps; and fuel storage for boilers.

The central chilled water plant includes four water-cooled chillers, four cooling towers, an indoor condenser water sump tank,  waterside economizers, a condenser water heat-recovery system for service water heating, and variable speed drive pumps.

Central plant heating, cooling, and power equipment all have N+1 redundancy, meaning that each component has at least one independent backup component. If individual central plant equipment were to go down, the plant can still provide for the hospital’s heating and cooling needs under all conditions.

The central plant is also designed to be as efficient as possible to support Mary Greeley Medical Center’s goal of LEED Silver certification.


Mary Greeley Medical Center’s new central plant can now accommodate the heating, cooling, and power needs of the 608,000 square foot hospital so it can continue to provide crucial healthcare services to central Iowans.

Built-in redundancy in the central plant means that staff and clinicians no longer have to worry about what might happen to patients in case of heating and cooling equipment failure.

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