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1947-48 Theatre Catalog, 6th Edition, Page 405 (391)

1947-48 Theatre Catalog, 6th Edition
1947-48 Theatre Catalog
1947-48 Theatre Catalog, 6th Edition, Page 405
Page 405

1947-48 Theatre Catalog, 6th Edition, Page 405

day matinees do not draw capacity audiences, even with air-conditioning.

For this second group of theatres, a lower than "maximum summer design" conditions could be used, providing the purchaser understands that the cooling must be started early enough to remove the accumulated heat before the audience arrives and that the system is being designed for capacity audiences under evening conditions (which should be so stipulated in the contract). ;

It is well to bear in mind that the flexibility of packages permits a theatre owner to install for night load only and at a later date, should the daytime volume of his attendance increase, he can make suitable additions in cooling capacity. These additions to cooling capacity, in the form of additional packages, can be installed for little, if any, cost above that which would result had the additional conditioners been a part of the original installation.


Another important consideration in arriving at the heat load of a theatre is the method of air distribution. Short runs of duct work that do not pass through the hot attic spaces are the most economical of heat pick-up outside the auditorium. Where the supply duct work does run through the hot attic spaces, a five per cent loss of cold air plus the heat gain through the insulated ducts must be figured as part of the load.

The outside air brought in for ventilation purposes is usually figured in terms of cubic feet per minute (cfm.) per seat. The usual high figure is 5 cfm. per seat and the usual low figure is 3 cfm. per seat.

The use of package conditioners for pre-cooling the outside air not only provides continuous humidity control, but also provides a much higher ventilation rate at less than maximum conditions. Because of this increased ventilation, an installation incorporating outside air pie-cooling by packages on the basis of 3 cfm. a seat will provide as much actual ventilation, on the average, as a conventional installation designed on the basis of 5 cfm. a seat. However, even with outside air pro-cooling by package air conditioners, a design value of less than 2 cfm. a seat is not recommended.

Next in importance to adequate capacity is the matter of a satisfactory noise level. Experience has shown that certain precautions and sound bathing are required to produce a sound level in the nearby seats that will permit a satisfactory audition of the show by the {liliil'aglt Dilll'Ull.


The selection of the proper type of job, load calculation, and layout is a matter for a competent air-conditioning engineer, but, for budget purposes, the .t'ollowing approximate figures on the cost per scat of summer-winter air-conditioning (exclusive of boiler and steam piping) can be used:

Low i . . .. .. . $11

Average ., , . $19

Abovl average .. . .. $25) SUMMATION

For the smaller theatre which is being remodeled as well as for new construction, packaged air-conditioning otters


FIGURE ZeA 75-hp. refrigeration compressor, of the type which would furnish refrigeration for a large central system, such as that diagrammatically presented in Figure 1. With this sort of system,- a machine room must be provided as well as space tor ct trunk supply duct and a return duct. Heating is usually accomplished through the same system with the source of heat being usually a steam boxler.

FIGURE aeFloor plan (with sectional detail) of a SSH-seat theatre cooled by packaged air-conditioners. It will be noted that very short supply ducts were required in this case. as space was available for the units adjacent to the conditioned urea and the location of the units provided or good air pattern 1n the theatre. Only utility connections, a source of heat, and duct connections are needed in this case.

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1947-48 Theatre Catalog, 6th Edition, Page 405