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 3.9.1 Quantitative Analysis
Provide a life cycle cost analysis of the alternative systems in accordance with NIST Handbook 135, "Life Cycle
Cost Manual". As a minimum, the LCC analysis shall determine the present worth of the first cost,
operating/energy cost, maintenance cost, and replacement cost over the life cycle. When available, the energy
costs used in the analysis shall be the actual demand and usage costs charged to the Activity by the utility
company. The study shall also provide a Qualitative Analysis of the alternative systems as described in
subparagraph B below. Provide a recommendation of the HVAC system and energy conservation measures that
should be used in the design of the project.
3.9.2 Qualitative Analysis
Provide a subjective analysis that describes the positive aspects and negative aspects of each of the proposed
system alternatives. As a minimum, take into account the complexity, maintainability, reliability, energy
efficiency, and affordability of the systems being studied. Provide a recommendation of the HVAC system and
energy conservation measures that should be used in the design of the project.
The study deliverable shall include an executive summary and all backup information. The study shall be
organized to clearly show the results of the analysis, how the system(s) selected meet the functional requirements
of the building, and the backup information that supports the report. If a Life Cycle Cost analysis is performed;
provide tables and data to show the present value of each of the alternatives studied including the present value
of each of the life cycle cost components (first cost, operating cost, maintenance cost, replacement cost, etc.).
3.10 Design Energy Target (DET) Compliance Check
The DET Compliance Check is the DOD's procedure for complying with federally mandated energy
conservation requirements for federal buildings and facilities. If a DET Compliance Check is required, the
project will be assigned a Design Energy Target (DET) goal. The AE will calculate a Design Energy Budget
(DEB) and compare it to the DET. The design complies with DOD requirements if the DEB is less than or equal
to the DET. If the DEB does not meet this criterion, the design must be altered until compliance is achieved
unless EFACHES determines that extenuating circumstances prevent compliance.
The DOD has calculated DET's for different regions and building types (office, hospital, school, etc.). They are
based on certain assumptions to provide a baseline of acceptable energy performance for comparison with
specific projects. The DET and DEB include only non-process energy and have units (Btu/Sf*Yr). Comparison
of the project DET and DEB provides the Government with a guideline to determine the relative energy
consciousness of alternative energy models. They are not intended to predict actual energy consumption for a
completed building.
DET Compliance Checks are typically performed for new construction. They are also performed for major
renovations when the construction budget includes the cost of bringing the facility up to current energy
standards. Facilities having a process energy load exceeding 60% of the calculated total peak heating and/or
cooling load are exempt from the DET Compliance Check.
Procedures for performing the DET Compliance Check are outlined in "EFACHES Guidelines for DET
Compliance Check", available from Code 403 through the project AIC/EIC.
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