Consulting Specifying Engineer Consulting-Specifying Engineer (November-CSE) : Page-18

MEP Roundtable system receives input to perform controls functions and which system just moni-tors the operation and position status of equipment. Jones: Within older facilities, there frequently is a combination of BAS with different manufacturers depending on when retrofits or renovations occur. This presents a challenge when introducing new equipment and maintaining an inte-grated control system. Smith: The biggest issue is the control vendors ignoring engineered designed control sequences and trying to substitute canned programs to save themselves time and money. CSE: What unique HVAC require-ments do hospitals have that you wouldn’t encounter on other structures? Kos: Hospitals and outpatient facilities must comply with ASHRAE and other regulatory standards with respect to air change rates, outdoor air exchange rates, and pressurization. Since the patient pop-ulation in hospitals and some outpatient facilities can contain some of the most vulnerable patients, the systems in these buildings also need to be reliable, redun-dant, and as easy to maintain as possible. Smith: Hospitals are very unique in that they require high amounts of airflows, pressure relationships between spaces, and filtration to prevent hospital acquired infections (HAIs). Banse: Unique HVAC requirements are not confined to hospitals, but this building type does have its share. Fully ducted supply air, return air, and exhaust air systems; positive and negative pres-sure relationships of rooms with required minimum pressure differences to adja-cent spaces; air cleanliness through MERV 14 and HEPA filtration; lami-nar directional airflow in many room types; minimum and maximum veloci-OSTS. H AIR. C E C . REDU TH OF FRES Y G R E EA EN SAVE HAT’S A BR NOW T Improve the atmosphere in commercial buildings with cutting-edge energy recovery ventilators (ERVs) from Ruskin Rooftop Systems. State-of-the-art ERVs • 20+ years of ERV R&D expertise • Reduced energy costs • Improved comfort • Attractive return on investment With an ERV from Ruskin Rooftop Systems – you and your customers can ENJOY A BREATH OF FRESH AIR. Visit or call us at (972) 247-7447, to learn more about our energy savings solutions. ties relative to patent positions; varying room temperature ranges and relative humidity ranges for various rooms; and increased number of control zones are a few that come to mind. Najafi: Hospitals offer the HVAC designer a litany of space types to design, each with its own set of requirements. Space types include the mundane, such as office and lobby spaces, as well as the uniquely demanding surgical procedure rooms, MRI suites, CT scan rooms, and electrophysiology laboratories. While each space has particular requirements, none of the individual space requirements are with-out parallel to other spaces. MRI suites, for example, require from the HVAC designer to deal with electromagnetic radiation and shielding, which is similar to sensi-tive compartmented information facility (SCIF) design. The high airflow rates and HEPA filtration requirements for surgi-cal suites are very similar to that of clean rooms, while lobbies and office spaces are spaces of a more traditional design. The unique requirement for a hospital design is incorporating all of the different space types into one methodology providing the ventilation, heating, and cooling for all from a few central locations. Orzewicz: There are varying degrees of redundancy required that typically are not in other structures. This affects not only the central generation equipment, which often requires an N+1 design, but also the air handling unit design. Along with redundancy, operating rooms have been requiring lower temperatures while main-taining acceptable relative humidity. We have maintained spaces as low as 58 F while not exceeding 55% relative humid-ity. Lastly, air pressurization is critical and must be maintained at certain levels in varying spaces. The type of space will determine the amount of monitoring and alarms required in the design. Read more about hospitals and health care facilities at Topics include: Ⅲ Clash detection Ⅲ Codes and standards Ⅲ Fire/life safety solutions Ⅲ High-rise facilities Ⅲ High-performance buildings Ⅲ HVAC Ⅲ Smart building controls A Ruskin Company 1625 Diplomat Drive, Carrollton, Texas 75006 I Phone (972) 247-7447 I Fax (972) 243-0940 I input #14 at

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