MIL-HDBK-1191
seamlessly compatible with the EMCS system. DDC systems shall provide
distributed control, with individual equipment digital controllers
("applications specific controllers" or similar terminology) capable of
stand-alone control of major equipment, and communicating with a central
monitoring/reporting/ station as appropriate.
8.9.5.1
Energy Monitoring and Controls Systems (EMCS) . No remote EMCS
system (ie., not located in the medical facility or its associated energy
plant) shall be permitted to exercise control over any hospital HVAC system
equipment providing service to Critical Care Spaces. Remote EMCS systems
may be provided with monitoring, alarm, and reporting capabilities as
necessary to facilitate maintenance activities.
8.10
Steam Systems.
8.10.1
Humidification Steam Source. Steam generated by heating system
boilers, or any other steam containing harmful concentrations of amines or
other treatment chemicals, shall not be used for space humidification.
Separate steam generators for humidification shall be provided. The design
shall include provisions to minimize the effects of system corrosion
resulting from the heating of undeoxygenated water.
8.10.2
Sterilizer Steam Source. Steam generated by boilers located in
an on-site (hospital-dedicated) boiler plant may be utilized for
sterilization steam subject to approval by the individual military
department. As hospital authorities cannot normally exercise a reasonable
degree of supervision or control over treatment chemicals utilized in base-
wide or district systems, steam from these sources may not be utilized for
direct sterilization. Unlike humidification steam, which is injected
directly into the air supply, little sterilizer steam will escape into a
facility's general environment. Under a reasonably responsible boiler
treatment program, any steam which does escape will not result in
dangerously high levels (OSHA RELs, etc.)of treatment chemicals in the
environment.
8.10.3
Designer Qualifications. Projects involving the design of
extensive medium or high pressure steam systems require the services of
engineers highly experienced in this specialty. Too often, experience has
shown that mechanical designers unfamiliar with steam system design err in
the design of expansion compensation, condensate collection and handling,
and equipment selection. Design Agents must insist on proper
qualifications for designers of these systems.
8.11
Air Handling and Distribution.
8.11.1
Air Handling Unit Considerations. Air handling units are to be
double wall, internally-insulated, readily maintainable units suitable for
utilization in medical facilities. Draw-through units are normally
preferred, to utilize fan heat to increase the dry bulb air temperature
above the saturation point and minimize the possibility of wetting
downstream filters, attenuators, or other components. Provide for access
doors immediately upstream and downstream of all coils, to facilitate
cleaning and proper installation of the unit freezestat.
8-12
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