3.8.5 HVAC SYSTEM DESCRIPTION
(a) The HVAC system for the Uninterruptible Power Supply (UPS) shall be
based on a conversion of 9.75 kW (3.0 tons) = 2 KVA for UPS power.
(b) Provide at least one back-up A/C unit in the computer room.
(c) Use underfloor space as an air distribution plenum. Provide 450 mm (18
inches) clear space for new buildings and a minimum of 300 mm (12 inches)
clear space for existing buildings. Coordinate this requirement with the
architect.
(d) Provide a water detection system, with an alarm device, to detect
moisture in the plenum below the raised deck.
3.8.6 SPECIAL CONSIDERATIONS
Consider the following features into the design of HVAC system:
(a) Automatic controls with alarm warning when 65 percent maximum relative
humidity under the floor is reached.
(b) Built-in redundancy by use of multiple refrigeration circuits or
multiple air-handling units
(c) Downflow to feed underfloor air distribution system
(d) Noise level NC 35
3.9 DENTAL PROSTHETICS LABORATORY
3.9.1 COOLING LOAD
Cooling load requirements for the laboratory and ceramics room shall be as
follows:
(a) Laboratory 0.70 Watts/Sq M (6.0 Watts/Sq Ft); Ceramics Room 1.3
Watts/Sq Ft (12.0 Watts/Sq Ft).
(b) Internal heat load due to laboratory equipment and gas burners, etc.
is factored in the lighting load.
3.9.2 CERAMICS ROOM
(a) Maintain positive pressure in the room.
(b) Provide wall mounted exhaust registers at or near the technician
workbenches. Coordinate location(s) with the architect.
3.9.3. LABORATORY
(a) Exhaust 11 Cu M (400 CFM) (minimum) from the prosthetic dental
workstation by installing wall registers at table height or through a
canopy type hood. Exhaust air can be taken through a general exhaust
system. The hood location shall be shown on, and in coordination with, the
architectural equipment drawings.
HVAC DESIGN MANUAL
3-6
HVAC REQUIREMENTS FOR OCCUPIED AREAS
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