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1950-51 Theatre Catalog, 9th Edition, Page 372 (350)

1950-51 Theatre Catalog, 9th Edition
1950-51 Theatre Catalog
1950-51 Theatre Catalog, 9th Edition, Page 372
Page 372

1950-51 Theatre Catalog, 9th Edition, Page 372

FIGURE 9-Controlling grilles installed on either side of the proscenium to cool the Beverly Hills, Dallas.

passes through the evaporative cooler,

will have a dry-bulb temperature of 830 with a relative humidity of 75%, while the wet-bulb temperature remains the same or 770. This cooled air, delivered into the theatre with proper velocity and distribution, will produce an effective temperature of 77 0.


It must be distinctly understood that an evaporative cooling system is not a refrigeration installation and may not rightfully be compared to the latter in concept or results; any such comparison would be unfair and unjustified. The limitations of the evaporative cooling system are well-known and can be

readily discussed. It will not remove moisture from the air, and the amount of temperature reduction is entirely dependent upon outdoor weather conditions. It uses a 100% supply of fresh air at all times, and must supply air to the theatre in greater quantities than any other type of system.

On the other hand, however, an evaporative cooling system is a relatively simple and low-cost installation. Service troubles are at a minimum because there is very little complex machinery in its equipment. Water costs are low, since the quantity of water used is represented only by that amount evaporated away into the air. A normal and usually attained result is a temperature reduction within the theatre proper of 10a or

FIGpRE Ill-Map showing summer wet-bulb tern eratures throughout the U. 5. indicates that evaporative cooling may be used in many localities success ully. The wet-bulb temperatures shown will be exceeded not more than 5% oi the total hours during June to September. inclusive, 0! a normal summer.

more when outside weather conditions are are 900 or above. In some localities a great deal more cooling than this will be possible; in .extremely damp areas perhaps considerably less will be attained.

When all is said and done, the evaporative cooling system does have a definite part in theatre air conditioning. It has proven to be a particularly advantageous means for obtaining satisfactory cooling at a low-budget level in the case of the smaller theatre operating on a partial or night-time schedule.

It is well worth repeating that an evaporative cooling system must be just as carefully chosen and designed as to its size and installation as any other type of system. It has far too often received a black eye because of a wrong choice of equipment, improperly applied and of insuiiicient capacity. Properly designed and operated, an evaporative cooling system can be put to work in a satisfactory and wholly acceptable manner

for many theatres. * * *

Acknowledgments The Editors of THEATRE CATALOG wish to express their appreciation to the following for supplying the background material contained in the forgoing article: 1. L. P. Hanson, Vice-President in Charge of Sales, United States Air Conditioning Corporation.

NOTE: While this firm was one of the early evaporative cooling manufacturers, its main efort is now concentrated on the production of refrigeration equipment for theatre use.

2. H. F. Rodick, President, National Engineering and Manufacturing Company.

3. G. R. Holtz, Farr Company.

1950-51 Theatre Catalog, 9th Edition, Page 372