MIL-HDBK-1191
serving to enable Users to predict the future energy demands and costs for a
particular facility. When required by the individual military department,
TDEU shall be calculated during concept design. The calculation shall include
all facility energy demands, including process loads, and shall be modeled on
the actual schedule of operation intended for the facility.
7.5
Design Analysis. Medical facility design projects require
analysis of building heating and cooling loads, annual energy consumption,
and life-cycle cost economics, to serve as the basis of equipment and systems
selections. Subject to compliance with medical functional requirements and
project funding limitations, selection of energy consuming systems and design
features shall be based on Life-Cycle Cost Analysis (LCCA) of the relative
energy, maintenance, and initial costs.
7.5.1
Energy/Load Analysis. Energy and load analyses for all new
facilities, additions, and major alterations larger than 280 gross square
meters (3000 gross square feet) shall be conducted with the use of a computer
program utilizing a calculation method recognized in the ASHRAE Fundamentals
Handbook. The computer program is to be acceptable to the Design Agent, and
utilize an hour-by-hour calculation procedure. For projects less than 280
gross square meters (3000 gross square feet) analysis may be by an accepted
computer program or by manual calculations in accordance with the
Fundamentals Handbook.
7.5.2
Life-Cycle Cost Analysis (LCCA). LCCA shall be executed in
accordance with the procedures specified in the National Institute of
Standards and Testing (NIST) Life-Cycle Cost Handbook (reference 7j), and
supplemental military departmental criteria as appropriate. The present
worth discount rate, and future fuel escalation rates, used in the LCCA shall
be those published in reference 7i. Unlike the energy analysis, LCCA's shall
be based on actual operating hours, and shall realistically reflect first
purchase, installation, operations, maintenance, and replacement costs that
occur within the study period. Designers are cautioned that although most
energy/load programs are available with life-cycle cost programs, many of
these are not in accordance with the NIST Handbook, or may not utilize the
correct discount factor. Consult with the Design Agent to identify
acceptable programs.
7-4
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