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1947-48 Theatre Catalog, 6th Edition, Page 414 (400)

1947-48 Theatre Catalog, 6th Edition
1947-48 Theatre Catalog
1947-48 Theatre Catalog, 6th Edition, Page 414
Page 414

1947-48 Theatre Catalog, 6th Edition, Page 414

ature refrigeration plant for the National Advisory Committee for Aeronautics test tunnel in Cleveland, and consists of fourteen 1,500-horsepower, fourstage, centrifugal-type compressors with a refrigerant charge of 58,000 pounds of Freon-12. The main purpose of this refrigerating system is to extract the heat generated in the tunnel by the fan which circulates the air at 500 miles an hour and by the engine on test and, at the .same time, maintain a temperature of -80 degrees Fahrenheit, corresponding to the altitude of approximately 50,000 feet.

Freon-12 has had wide usage and practically universal acceptance as an aerosol propellent of many different kinds of chemicals, such as, insecticides, germicides, fungicides, insect repellents, deodorizers, and perfumes; and probable use in leg colors and hair dressings.


Freon-22, monochlorodifluoromethane (CHClF2), has a boiling point of #414 degrees Fahrenheit, and is used as a refrigerant in industrial and commercial low temperature refrigerating systems to e150 degrees Fahrenheit employing reciprocating type compressors and for a multitude of uses, some of which are these:

1. Calibration of temperature measuring devices.

2. Accelerated aging of steel for the production of precision tools and gauges.

3. Cooling of metal bushings or shafts for shrink fits.

4. Cooling and storage of aluminum rivets, spars, and sheets to prevent aging before fabrication.

5. Hardening of pitch to make it brittle and easily removable from lenses.

6. Testing of airplane engines, instruments, radio sending and receiving sets, radar equipment, calibration of instruments and measuring devices, hydraulic equipment and accessories.

TYPICAL 01" THE MODERN EQUIPMENT in which various members of the Freon family are used as the refrigerant is this reciprocating-type compressor (left), manufactured by the Westinghouse Electric Corporation (in a system designed and installed by Western Air and Refrigeration, Inc.,

'7. Cooling of oil Or other coolant in high-speed machining and cutting operations.

8. Cooling of brine circulated to welding tips.

9. Low temperatures for the production and storage of penicillin and blood serum.

10. Low temperatures for the storage of blood for plasma, production of blood plasma, and storage of blood plasma.

11. Low temperature chamber designed to duplicate stratospheric conditions for the testing of instruments, flying clothes, personnel, equipment, and construction of operating materials.

Freon-22 will be used in many instale lations where more efficient operation is desired in providing the necessary lower temperatures for low temperature locker plants, lower temperatures and resulting quicker freezing of foodstuffs, and greater volume of product handled by quick freezing units, home or farm freezers, and countless numbers of low temperature industrial applications.

Freon-22 is being used as an intermediate for the production of polytetrae fluoroethylene, and this material with most unusual qualities is offered by DuPont under the trade name of Teflon. This polymer is unique among organic compounds in chemical inertness, resistance to change at high temperatures and extremely low dielectric loss factor. Teflon is extremely resistant to attack by corrosive reagents and to dissolution by all the solvents that were tried. No substance has been found that will dissolve or even swell the polymer at room temperature and pressure.

Freon-13 and Freon-1 4

Freon-13, monochlorotrifluoromethane (CClF2), and Freon-14, tetrafluoromethane, or carbon tetrafluoride (CE), two compounds recently added to the Freon family, have boiling points of -114.5 degrees Fahrenheit and e198 degrees

Fahrenheit, respectively, and will undoubtedly find usage as refrigerants in extremely low temperature industrial refrigerating systems approximating liquid air temperatures, and will be employed in cascaded reciprocating type compressors. The use of these two Freon refrigerants will require thorough investigation and research as to the behavior of metals at low temperatures and under stress, lubrication of mechanical compressors, and the possible development of more efficient insulating materials.


Capacity crowds reward the owner of the air-conditioned theatre during the hot summer months. The air-cooled theatre offers relief from stifling discomfort. Cooling comfort is a showhouse attraction even without a first-rate show. People seek the theatre offering cool, refreshing air for they know that a good show and air-conditionad comfort are twin attractions with an irresistible boxofiice appeal. Some of the finest pictures and shows play to half empty houses when theatres do not Oder cool inviting comfort during the summer months. Summer attendance is tremendously increased after air-conditioning is installed and smaller houses which have installed cooler systems have gained in prestige at the expense of the larger theatres which have ignored public insistence for air-conditioning.

The refrigerants used in theatre installations for making all of this possible are Freon-113 or Freon-11 in centrifugal-type compressors, especially in the larger theatres, and Freon-12 in reciprocating-type compressors varying in size from the smallest to the largest horsepower or tonnage refrigeration effect. Freon-12 is also Widely used in the fractional horsepower size of system for foyer installations of ice-cream cabinets, soda fountains, and beverage anrl water coolers.

tor the West Coast center of the National Broadcasting Company); and the centrituanype compressor (right), manufactured by the York Corporation (Installed in the Stix, Baer, and Fuller department store in Saint Louis). (All of the photographs are through the courtesy of Kinetic Chemicals, Inc.)

1947-48 Theatre Catalog, 6th Edition, Page 414