terminal units with or without reheat coils shall be used when all air
systems are selected. See VAV Systems Article 2.4 for specific design
considerations.
1.9.3.5 Energy Efficient Motors: Refer to the VA Standard Detail 15000-
50 for application and schedule.
1.9.4 THERMAL STORAGE AND MAJOR CONSERVATION SYSTEMS
The evaluation of a thermal storage (Example, Ice Storage) or any major
energy conservation project shall be based on the following
considerations:
1.9.4.1 The system shall be a non-proprietary, proven technology, which
can be supplied by at least two, preferably more, manufacturers.
1.9.4.2 The A/E shall have prior satisfactory design, construction, and
operational experience of the similar projects.
1.10
DESIGN FOR EXISTING BUILDINGS
1.10.1 GENERAL
1.10.1.1 The designer is responsible for surveying the existing
buildings to determine if adequate space is available for ducts and
equipment. He must not rely upon the station furnished as built
drawings alone. Early in the design stage, arrangements must be made
with the Station Engineering Officer for access above ceilings to
determine field conditions and to locate existing HVAC including steam
lines and other services. Consider that most corridor ceiling spaces
are loaded with equipment to remain and may create installation
problems for new equipment. Provide sections to resolve conflicts.
Required demolition of existing HVAC work must be shown on the
drawings. Location of new equipment and services must be coordinated
with all involved parties. Phasing of the construction work must be
coordinated with operation of the facility and VA staff and be provided
for in the design.
1.10.1.2 In existing buildings, the floor-to-floor heights are
generally less than 3.6 m (12 feet). In addition, the building
structure elements also occupy substantial spaces between the underside
of the slab and the suspended ceilings. The installation of an all air
system is therefore very difficult, if not impossible. During the
schematic stage, the A/E shall make a detailed evaluation of the
available space and determine whether the installation of an all air
system is feasible. If all air systems are not feasible, the need to
perform a life cycle cost analysis shall be reviewed with the VA
Reviewer.
1.10.1.3 If the VA medical center wishes to retain the existing HVAC
equipment, considered obsolete as a result of modification, this should
be noted on the demolition drawings; otherwise, the contractor in
accordance with the General Conditions of the contract will dispose it
off.
1.10.1.4 Investigate the conditions of the existing steam supply and
condensate return piping and provide recommendations.
HVAC DESIGN MANUAL
1-29
GENERAL REQUIREMENTS
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