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1945 Theatre Catalog, 4th Edition, Page 400 (376)

1945 Theatre Catalog, 4th Edition
1945 Theatre Catalog
1945 Theatre Catalog, 4th Edition, Page 400
Page 400

1945 Theatre Catalog, 4th Edition, Page 400

RADIANT-HEATING COILS MAY BE FABRICATED in a contractor's shop or welded together as needed at the site of the iob, as the men in this photograph are doing. One of the reasons that so many contractors specify wrought iron for radiant-heating proiects is because of the ease with which this ferrous metal may be welded.

ployed when a conventional heating system is involved. Once the total of all heat losses is known, the next move is to determine the heating requirements, usually expressed in the units of heat per hour per square foot of panel surface. Then it is possible to install the heating system for maximum effectiveness.


Radiant heating systems are installed in the floor by laying coils or grids of

wrought iron pipe on a gravel or crushed stone fill and then covering the pipe network with concrete.

In the selection of piping material, consideration must be given to four important factors: The pipe must transfer heat with the smallest possible difference in temperature; it must be mechanically strong and be able to expand at the same rate as surrounding materials; it must resist corrosion, and must be conducive to easy bending and welding into a durable unit.

FLOOR ISLANDS present no problem in a radiant-heating system, inasmuch as the coils may be bent with comparative ease to by-pass them, as indicated by this picture. The heating coils rest on small concrete piers, so that the pipes will be completely embedded when the floor is poured. Wrought iron and concrete, having the same expansion coetticient, eliminate the possibility of cracking the concrete floor slab when the heat is turned on.


SENDING PIPE FOR A RADIANT-HEATING SYSTEM is facilitated by a simple rig used by the workmen pictured here. The reason that most contractors chose wrought iron for use in radiant-heating installations is that it is, in comparison with the materials that might have been used, not only easily bent but more workable.

The vast majority of radiant heating installations have been made with wrought-iron pipe, inasmuch as this material has been time-tested for corrosion resistance, expansion properties, and ease of fabrication.

A sloping floor-such as those installed in most theatreseis no problem in a radiant heating system. The majority of systems operate on a forced-circulation feed from the hot-water boilers. Fact is, many systems are designed on an incline purposely to facilitate gravity drainage.

Although the floors of most theatres are of concrete, a radiant heating system may be installed in wood floors as well. Also important is the fact that the floor temperatureewhether it be wood or concreteenever exceeds normal body temperature in a proper radiant heating system. Floor covering-carpet, asphalt tile, linoleum and various monolithic surfaces-are in no way affected by the heating elements.

Any of the conventional automatic control devices may be used on a radiant heating system. Common type room-air thermostats have been employed in hundreds of installations. In larger structures, such as theatres, churches and factories, it is considered advisable to anticipate comfort demands by using control devices actuated by fluctuations in outdoor temperatures. Since variations in outdoor temperatures usually precede changes in indoor temperature, it follows that if the heating plant is started in advance these temperature changes can be compensated earlier.


Operation of a radiant heating system is essentially the same as the operation of any conventional hot water system. Any type of fuelegas, coal, fuel oilemay be used with equal success. The boiler can be located in a utility room, partial basement or full basement.

1945 Theatre Catalog, 4th Edition, Page 400