at entrances and exits) separating construction from occupied areas,
protection of air distribution systems serving occupied areas, and
disinfection of any reused ductwork. Designers should consult with the
facility's infection control representative during the design process to
assure thorough coordination of design features that may affect patient
Construction Phasing Plan. Designers shall develop a phasing
plan, consisting of detailed written instructions as well as any
graphic/drawing aids necessary to clearly communicate the content,
location, and sequence of work activities. The plan shall identify the
scope, duration, and timing sequence of each individually identifiable work
item, with all required lead-in, preparatory, and commissioning activities.
Commissioning Considerations. More so than in new, stand-alone
facilities, off the shelf guide specifications fall short of providing for
all of the required commissioning procedures. In particular, designers
shall show and specify the procedures required for interim, as well as
final, commissioning for systems constructed (or altered) and placed in
Cooling and Heating Load Calculations.
Heating Load Calculation. Calculations used for determination
of primary and airside (including reheat) heating equipment should not
include credit for internal load sources, including lighting, people, and
equipment. These loads are typically not present, or are much reduced, at
night and on weekends. Heat calculations should also take into
consideration morning warmup loads when night setback temperatures are
utilized in non-ward areas.
Equipment Heat Generation. In many spaces within facilities,
the primary component of cooling loads will be equipment heat generation.
It is therefore necessary for accurate load determination that the HVAC
designer coordinate on a project-by-project basis with the equipment
designer, and with the individual Using Agency, to identify all individual
equipment items and the corresponding load contributions. To estimate
equipment usage duration and frequency, designers shall gather information
from the Using Military Department, or if unavailable from that source the
manufacturer, personal experience, or other sources. Determine average
heat output from manufacturer's information. In performing load
calculations, designers shall consider the as-designed equipment provisions
of each unique space. "Rules of thumb" loading assumptions are not
acceptable for final design calculations.
Lighting Loads. Lighting loads present a significant component
of medial facility cooling loads and as such require consideration of the
as-designed lighting fixture numbers and characteristics of each space.
"Rules of thumb" lighting load assumptions are not acceptable as the basis
for final design load calculations.
Envelope Components. Minimum insulation values for building
envelope components are listed in Section 7 of this manual. U-value
calculations shall take into consideration the "fin effect" of metallic