(b) Phasing requirements
(c) Capacities and conditions of the existing HVAC systems, if any, serving
the areas to be renovated
(d) Impact of the renovation activities on the adjoining areas not included
in the project
2.2.6.2 While it is desirable to follow the structural and architectural
symmetry of the building by providing a dedicated AHU to service a specific
module/quadrant. This approach should not compromise the functional integrity
of the spaces. Generally, different medical departments are to be provided
with dedicated AHUs to meet their HVAC requirements. Deviations from
providing dedicated AHUs should be referred to the VA with specific
information as to the extent and impact of any violations.
2.2.7 DUCTED RETURN/EXHAUST REQUIREMENTS
Return and exhaust air shall be ducted for all spaces, i.e., air shall not be
taken through ceiling plenums, mechanical equipment rooms, corridors or
furred spaces. Circulation of air directly between functional areas is not
permitted, except for toilet rooms and janitor closets. The exhaust air to
the toilet should be transferred via door undercuts or louvers. Transfer
grilles are not permitted between corridor and occupied spaces.
2.2.8 CORRIDORS, TOILETS AND JANITOR CLOSETS (HACS)
Conditioned air shall be supplied to corridors, toilets, janitor closets
(HACs), and bathrooms, etc., which open directly to the corridor to maintain
design temperature and to provide make-up air for the exhaust air
requirements.
2.2.9 FUNCTIONAL NEEDS OF SPACES
(a) Ventilation Air:
(1) 100 percent outdoor air, or
(2) Minimum outdoor air, as stipulated in Article 1.3.
(b) Hours of Operation:
(1) 24 hours a day throughout the year, or
(2) 10 to 12 hours with weekend/holidays shutoff.
(c) Interior design conditions:
(1) Room temperature and humidity, or
(2) Summer and winter set points
(d) Supply air volume:
(1) Constant air volume with minimum fixed air changes per hour; or
(2) Variable air volume with flexibility to vary the supply air volume
according to the fluctuations in the cooling load.
HVAC DESIGN MANUAL
2-2
HVAC SYSTEMS AND EQUIPMENT
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