(b) The outdoor winter design temperature is between 12 degrees C (10
degrees F) and 7 degrees C (19 degrees F) and the building thermal envelope
does not conform to the requirements outlined in Article 1.9.
2.7.3 DELETION OF PERIMETER HEATING
The perimeter heating can be deleted if the building thermal envelope
conforms to the requirements outlined in Article 1.9 and the outdoor
temperature is -6.5 degrees C (20 degrees F) and above. See Article 2.16 for
emergency power requirements for the heating equipment.
2.7.4 HYDRONIC HEATING
2.7.4.1 GENERAL
(a) Hot water heating system is preferred where extensive runs of piping with
multiple terminal units, such as air terminal units (Variable Air Volume or
Constant Volume Boxes) and/or perimeter heating devices, are involved.
(b) The minimum pipe size shall be 20 mm (3/4 inch). See Article 1.3.15.3 for
the pipe sizing criteria.
2.7.4.2 APPLICATIONS: Depending on the ambient conditions, the hot water or
hot glycol water solution can be used as the heating medium either at the air
handling units or with the terminal units in the occupied spaces as well as
in the miscellaneous spaces listed below:
(a) Warehouse and Storage Spaces
(b) Vehicular Storage and Maintenance Spaces
(c) Attic spaces and Vestibules
(d) Laundry Facility
(e) Mechanical Equipment Rooms
(f) Loading Docks
2.7.4.3 EQUIPMENT
(a) Unit Heaters and Cabinet Unit Heaters
(b) Finned Tube Radiation
(c) Convectors
(d) Radiant Heating Ceiling Panels
(e) Heating Coils mounted in air handling units and terminal units, such as
fan coil units and VAV/CV boxes
(g) Air Curtains
HVAC DESIGN MANUAL
2-13
HVAC SYSTEMS AND EQUIPMENT
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