The basic principle.
WHAT COOLING DOES
Removes heat from the air, and rejects it outside the building.
THE BASIC SEQUENCE
Equipment heats air Warm air is collected Heat is transferred to a cooling medium The medium carries heat outside Cooled air returns to equipment
WHAT AIR-BASED SYSTEMS USE
Units within or beside the hall, cooling air directly.
WHAT WATER-BASED SYSTEMS USE
Chilled water circulated to cooling units, with heat rejected outside.
WHY WATER SYSTEMS ARE COMMON AT SCALE
Water carries heat far more efficiently than air.
WHAT FREE COOLING MEANS
Using outside air or conditions to reject heat without mechanical refrigeration.
WHERE IT WORKS
Climates cool enough for part of the year.
WHY IT MATTERS LESS HERE
A consistently warm climate provides fewer opportunities.
WHAT THAT MEANS
Cooling is a larger proportion of operating cost in warm regions.
WHAT DETERMINES EFFICIENCY
How well hot and cold air are kept separate.
WHAT TO LOOK FOR
Containment, blanking panels, and correct tile placement.
