MIL-HDBK-1191
7.3.5.2
Renewable Energy Systems. Designers shall consider the economic
practicability of renewable energy systems, such as solar, wind, and
geothermal energy, for each project. When recent economic studies for
similar facilities in the project's climatic region demonstrate that such
systems are not life-cycle cost effective, those studies may be cited in lieu
of conducting new analyses.
7.3.6
Utility Costs. The utility cost data shall be ascertained from
the Installation's contracting office, or other approved source as directed
by the Design Agent. Utility cost escalation rates utilized in economic
studies shall be in accordance with Energy Price Indices and Discount Rates
for Life-Cycle Cost Analysis (reference 7i).
7.3.7
Equipment and Utility Monitoring and Control System. In
hospitals, and other MTF's as required by the Using Service and coordinated
with the Design Agent, a central monitoring and control system located within
the facility shall be incorporated into the design to provide central
monitoring, reporting, and control parameter adjustment capability.
Connection to an existing Utility Monitoring and Control System (UMCS) or
Energy Monitoring and Control System (EMCS) shall be as required by the Using
Service and coordinated with the Design Agent.
7.4
Facility Energy Performance. Each facility shall be designed so
that its Design Energy Usage (DEU) does not exceed the Design Energy Target
(DET) established in accordance with this section. The DET is an energy-use
performance target for the facility, which excludes energy required to
provide for medical functions, i.e. process loads, as defined further below.
It is not the intent to prioritize compliance with the DET over
considerations of life-cycle cost in the design and selection of building
elements, equipment and features. The DET compliance is a tool to help
assure that designs incorporate all practicable and cost-effective energy
saving opportunities.
7.4.1
Design Energy Target (DET). The DET's are established at Table
7-2 on the basis of facility type and climactic region. As indicated in the
notes to Table 7-2, the DET's are based on defined operating schedules. For
the purpose of comparing project DEU, facility energy consumption must be
modeled on the same operating schedule. Further guidance for computer
modeling is provided below.
7.4.2.1
Design Energy Usage (DEU). The DEU is a calculation of the
estimated energy consumption of a project facility, and is not to exceed the
DET. The DEU shall be calculated by the designer during the concept design,
and shall be updated as necessary thereafter based upon Design Agent
requirements. The DEU shall include all the energy required for conditioning
and ventilation systems (heating, cooling, and humidification) energy,
lighting, and domestic hot water generation required to provide for occupant
comfort and amenities. The DEU shall not include process loads, such as
energy used in laboratories, central material, food service, or ancillary
support operations. Similarly, energy required to compensate for the cooling
or heating loads associated with those operations shall not be included.
Service distribution system losses are included in the DEU if supplied from a
plant dedicated to the project facility. The area used to determine the DEU
shall be the gross area measured from the outside of the exterior walls.
7.4.2.2
Total Design Energy Usage (TDEU). The TDEU is an estimate of the
future energy consumption required to condition and operate the facility,
7-3
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