MIL-HDBK-1003/3
Application
of these techniques should only be considered when
required to
meet the design energy budget and when operation and
maintenance
are judged to be within the capability of local
maintenance
personnel.
c) Thermal Storage. Due to the added complexity in
system operation and controls, only use thermal storage systems
when required to meet the building energy budget and when proven
cost effective on a life cycle cost basis.
(1) Savings. Include demand charges, energy
charges (energy cost may be lower when thermal storage is charged
off peak), and savings in refrigeration equipment size reduction
in the life cycle cost analysis. An electric rate structure with
a high demand charge or with time-of-day metering rates provides
the best opportunity for savings on investment. Ensure that the
analysis includes the appropriate energy cost, e.g., billing for
electrical energy at a master meter vice the individual building
meter. If the station is master metered for consumers, addition
of a single building may have no significant impact on the demand
charge, and additional energy used may be at the lowest available
rate. Other opportunities for savings include reduced cost for
electric service, increased efficiency of equipment operating at
night, and reduced cost for fire protection if water storage can
be integrated with thermal storage requirements.
(2) Equipment Selection. Packaged thermal storage
systems complete with controls are preferred over field
fabricated systems.
2.2
Equipment Selection
2.2.1
General. Determine the type of heating and cooling
system to be used by the computer energy and life cycle cost
analysis as described in MIL-HDBK-1190, Chapter 8. Applicable
Navy design manuals and guide specifications provide guidance on
the recommended classes of equipment to be evaluated for the
particular application and size range.
2.2.2
Heating Equipment
2.2.2.1
Boiler Sizing. Refer to MIL-HDBK-1003/6, Central
Heating Plants and ASHRAE Handbook, Fundamentals for sizing
boilers. Boiler sizing should consider:
a) Connected load, which includes the heating load,
plus (where applicable) pipe loss and pickup, domestic hot water,
process loads, and boiler plant auxiliaries.
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