MIL-HDBK-1191
of the space to the adjacent spaces and corridor. Refer to more detailed
design guidance and requirements for isolation bedrooms under section 8.17
of this document. Pressurization control equipment serving Protective
Isolation and Disease Isolation Bedrooms shall be connected to the
emergency electrical power system.
8.8
General Design Considerations.
8.8.1
Plant Sizing and Optimization. Primary plant heating and
cooling equipment for facilities having inpatient functions shall be
designed to permit servicing of major equipment without total interruption
of service. The plant shall be sized based on two principles; Boilers,
chillers, and support equipment for the heating and cooling plants shall be
configured and sized such that:
- with one major heat exchanger or pump out of service, the
remaining plant equipment is sufficient to serve all critical care and
patient bedroom loads, plus one half of all remaining loads within the
facility.
- with one major heat exchanger or pump out of service for an
extended period (one day or more) of maintenance, during the "off" season
for such service, the remaining plant equipment shall be sufficient to meet
the facility's maximum load.
For such multiple boiler/chiller plants, designers shall utilize life cycle
cost analysis to help determine the optimum arrangement, number, and
capacity of machines.
8.8.2
Contaminant Removal. HVAC systems shall be designed to remove
or reduce to acceptable levels volatile chemical and airborne
microbiological contaminants within the facility. Systems shall be
designed to remove excessive moisture in facility spaces and to control
moisture and dust accumulation in air handling units, distribution
elements, and chases, to avoid conditions permitting the growth of
pathogenic, allergenic, or otherwise objectionable microorganisms.
8.8.3
Interdepartmental Air System Restriction. In general,
individual facility departments should be served by dedicated air handling
systems in order to increase system flexibility, energy conservation,
facilitate comfort control, and reduce demands upon the emergency power
system.
8.8.4
Air Filtration. Individual space air filtration shall be
provided as indicated at Appendix A. 25% or 30% efficiency "roughing"
filters shall be provided upstream of all coils, velocity sensing devices,
or other devices requiring protection from dust accumulation. "Roll
filters", cleanable media, or other filtration systems requiring more
intensive maintenance should be avoided. Designers shall carefully
consider the location of filters relative to humidifiers to minimize the
possibility of wetting the filter media.
8.8.5
Balancing Ports and Features. Necessary controls,
instrumentation, and balancing ports and devices shall be provided to
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