February 1, 2016

Havtech furnished a completely prefabricated mechanical/electrical equipment room for this project.  Given the design parameters, the manufacturer designed and produced a 2,000+ ton, 5,000 ft2 equipment room that would have been twice as large and more expensive had it been field-built.

Holy Cross Germantown
19801 Observation Drive, Germantown, MD
Owner: Holy Cross Health
Built: 2014
MEP Engineer: Syska Hennessy Group
General Contractor: Whiting‐Turner
Mechanical Contractor: Bell BCI

The Challenge

Hospitals are heavily regulated as to net square feet, number of beds, services offered, and fees charged. The challenge is to maximize the value of the facility within this framework. Hospitals are challenging because they have very long lives and are among the most energy-intensive of all types of buildings. The mechanical systems must, therefore, be long lived and of the highest quality and as efficient as practical.

The Solution

A solution that maximized the allowable area of the building, provided very high quality mechanical components and maximum efficiency was the incorporation of an Epsilon packaged mechanical plant. This is a free‐standing, completely factory designed, engineered, and fabricated mechanical plant. It consists of boilers, chillers, pumps, cooling towers, and electrical system. This 2,000+ ton plant is enormous at over 5,000 ft2 but it would have been twice as large if it had been field built. Working with Syska Hennessy Group in a design assist role, Epsilon used their advanced 3D computerized design to optimally arrange components. This plus their closely controlled factory fabrication results in minimum space required while insuring adequate access. The entire plant is classified as a piece of mechanical equipment (even though it shipped in 17 sections) because it is factory fabricated and bears the ETL label. This is important because it allowed Holy Cross to devote what would have been 5,000 ft2 or even 10,000 ft2 of mechanical room space inside the building to health‐related space. Epsilon personnel provided jobsite labor and expertise to assemble and start‐up the plant.

Refrigeration consists of 3‐550 ton Daikin model WME magnetic bearing centrifugal chillers and 2‐ 190 ton Daikin model TGZ Templifier water‐to‐water heat pumps. Depending upon fuel costs the plant can produce hot water via gas, oil, or electric heat pump. The Templifier heat pumps “amCapture 3plify” 44° CHW to 140° HW. Boilers are dual‐fuel 97% efficient condensing type. Sufficient structural integrity is provided to enable mounting of the heavy cooling towers on the plant’s roof.

The electrical distribution system consists of high voltage input switchgear and transformer inside a 1 hour fire‐rated enclosure. It serves chillers, towers, boilers, Templifiers, pumps, domestic hot water equipment, and fire pump. An Allen‐Bradley PLC controls the entire facility and is tied‐in to the main building BMS but also has a local touch screen interface.

Some of the benefits of the package plant are that, not only is it a higher quality installation than a field‐build system, it is also less expensive, takes much less construction me, reduces engineering time, and allows the owner and engineer to get exactly the brand and degree of quality that they want. The plant also qualified for a significant rebate from Pepco under the Empower Maryland Act. Epsilon worked with Holy Cross, Whiting‐Turner, Bell BCI, and Syska Hennessy Group on costs, alternatives, brands, and lay‐out to give Holy Cross exactly what they wanted and needed at the right cost.



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