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1947-48 Theatre Catalog, 6th Edition, Page 433 (419)

1947-48 Theatre Catalog, 6th Edition
1947-48 Theatre Catalog
1947-48 Theatre Catalog, 6th Edition, Page 433
Page 433

1947-48 Theatre Catalog, 6th Edition, Page 433

ing the heat stored in the earth, obtained by pumping water through submerged piping.' A closed U-shaped pipe circuit is enclosed in a 4- to 5-inch bore sunk some 200 feet in the ground below the operating later line. Since no water is pumped from the ground, there is no effect on the water level and there is no water to be disposed of.

The Muncie Gear Works plans to produce 10,000 Marvair units this year and hopes to step up production to 50,000 units in 1948. Mr. Smith, who designed the units, said that recent installation costs were approximately $1,650 for a 3-hp. unit, and $2,300 for a 5-hp. job, including the well installation. He believed that future installations could be made as low as $1,000, and said that they were planning on a mass production of Marvairs for small homes which he thought could be installed for as low as $600, exclusive of the ground heat exchanger.

Last fall the electric power board of Chattanooga installed five Marvair units in homes of that city. C. B. Osborne, sales manager of the board, informed the writer that he estimated that the kilowatt-hour consumption of the 3-hp. unit in his own residence would be under 5,000 kilowatt hours for a heating season. His house is a six-room brick construction with an hourly heat loss of 66,000 Btu.


Heat pumps have been manufactured on a productiondine basis by DrayerHanson, Inc., of Los Angeles, since March, 1946, and it has more than 200 units installed and in operation.

The companyis first reverse cycle installation was completed in 1938 for the Southern California Edison Company, and it has given good service ever since. Its product is called the Airtopia, and it is described as a fully automatic airconditioning machine for all-year use. The Airtopia operates on the air-to-air principle; it obtains heat from the outside air when heating is required, and dissipates heat to the outside air when cooling is required.

In December, 1946, the company reported that the retail prices of the four sizes of Airtopia units being produced were $2,100, $2,700, $3,800, and $4,850, respectively, plus freight charges from the factory, and plus the charges for duct work where required. The smallest size is for heating and cooling of small private homes and apartments up to six or seven rooms, for omce suites and small stores. The larger units are for applications requiring greater capacity.

The operating cost of the Airtopia for heating purposes is approximately equal to the cost of conventional coal, oil or gas-fired furnaces, where the cost of electricity is 11/2 cents a kilowatt hour as compared to coal at $14 a ton, oil at 9 cents a gallon, and natural gas at 70 cents a thousand cubic feet.

The company has also developed a unit similar to the Airtopia which uses water as the medium of obtaining and dissipating heat for use in colder climates where the outside temperature falls below 10 degrees. The company recently informed the writer that its production schedule for 1047 called for approximately 1,200 units of the air-to-air design and a


TERRA TEMP UNIT with cabinet removed shows, from top to bottom, blower and motor, thermostat controlled switching motor, unit coil which supplies heating or cooling to the air, transfer valve assembly tor reversing flow of refrigerant (with receiver tcmk in rear) and, in the bottom cabinet, the

semi-hermetic compressor. Favorable response has attained in tests by Terra Temp Company. Inc.

similar number of units of the water-toair design,

Terra Temp

The Terra Temp Company, of Indianapolis, is manufacturing a heat pump which has responded favorably to the most severe tests. It operates with a ground coil through which the refrigerant circulates, absorbing heat from the earth. The company claims that Where the electric rate is one cent per kilowatt hour, Terra Temp operation compares with heating with coal at $10 a ton, and with 11/2-cent electricity it compares with $15 coal.


The broader implications of the heat pump provide a fascinating field for speculation. Essentially, it means an efiicient utilization of the greatest, most inexhaustible source of heat that is available to us, the sun. How long can We afford to go on burning up our coal and oil and natural gas resources? The supply is not unlimited and it is not being replaced. Our known oil reserves are diminishing. In a recent report on natural gas reserves, the Federal Power Commission stated, tlThe presently known or proved gas reserves are at an all-time high . . . . This does not mean, however, that gas reserves are unlimited or that

discoveries may be counted upon for a ,

long period to equal or exceed going or increasing rates of production. It is an accepted fact that natural gas is a wasting asset and that for every pool discovered, there is one less to be found."

Both gas and coal are becoming in creasingly important as raw materials to be utilized in making motor fuels and synthetic chemicals. And the demand for motor fuels and the importance of synthetic chemicals will, without question, continue to grow at an accelerated rate.

It appears entirely safe to predict the successful application of atomic fission in our central-station electric-generating plants. This will mean unlimited production of electricity without consuming wasting assets. The utilization of this electricity, together with the virtually limitless resources of solar heat, appears, from a long-range economic standpoint, to be a "natural."

This is quite apart from the tremene dous stride forward in living conditions that the heat pump offers. As Doctor Kemler says, "The heat pump offers a type of heating that is not otherwise generally available, that is, combustionless heat. The complete elimination of combustion with all its unsatisfactory characteristiCS such as dust, dirt, smoke, explosion, and fire hazards, make the heat pump an unusually attractive type of heating for the home, as well as for commercial establishments."

Although all the problems are not yet solved, and further research and experimentation must be carried on, nevera theless it appears that the heat pump has come of age.

The development of this improvement in house heating by the electric utilities of the country is an outstanding example of private capitalis constant interest in raising the standard of material wellbeing.
1947-48 Theatre Catalog, 6th Edition, Page 433