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factories, Carrier slowly developed his system of “man-made weather” finally
applying it together with heating, cooling, and control devices as a complete
system in Graumann’s Metropolitan Theatre, Los Angeles, in 1922.
2. The first office building air-conditioned by Carrier was the 21-story Milam
Building (1928) in San Antonio, Texas. It had a central refrigeration plant in the
basement that supplied cold water to small air-handling units on every other
floor: these supplied conditioned air to each office space through ducts in the
ceiling. The air was returned through grills in doors to the corridors and then
back to the air-handling units.
3. A somewhat different system was adopted by Carrier for the 32-story Phila-
delphia Savings Fund Society Building (1932).
The central air-handling units were placed with the refrigeration plant on the
20th floor, and conditioned air was distributed through vertical ducts to the oc-
cupied floors and horisontally to each room and returned through the corridors
to vertical exhaust ducts that carried it back to the central plant. Both systems of
air handing (local and central) are still used in high-rise buildings.
4. The Great Depression and Word War II reduced the demand for air-
conditioning systems. It was not until the building of the United Nations Secre-
tariat in New York City in 1949 that Carrier produced a method of air condi-
tioning that could deal effectively with the large heat loads improsed by the
building’s all-glass curtain walls. The conditioned air was delivered not only
from the ceiling but also through pipe coil convector units just inside the glass
wall.
1. Define the affirmation to be:
1) Carrier was a pioneer in the field of air-conditioning.
¾ True
¾ False
¾ No information
2) The conditioned air passed through wall ducts in the 21-story Milam Building.
¾ True
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