File:Notes on heating and ventilation (1906) (14578847417).jpg

Identifier: notesonheatingve01alle (find matches)
Title: Notes on heating and ventilation
Year: 1906 (1900s)
Authors: Allen, John Robins, 1869-1920
Subjects: Heating Ventilation
Publisher: Chicago, Domestic engineering

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the furniture of the room. The decrease ofhumidity due to the action of the heating systemoccurs particularly in the indirect heating system.There has been placed on the market wdiat is calleda humidostat. This is similar to a thermostat ex-cept that it is arranged so that as the moisture de-creases in the room the humidostat opens up a se-ries of steam or water jets in the air supply so thatthe air in passing through the steam or water jettakes up moisture. When the moisture gets to acertain percentage, determined by the setting ofthe humidostat, the apparatus closes ofif automatic-ally the steam or water jets. Such devices areparticularly desirable in connection with schooland hospital heating plants. In the large cities the smoke and dust in the airmakes■ it undesirable to introduce this air directlyinto the room for ventilat-ing purposes. A great Air Washers,many schemes have been tried to remove the dust from the air. The earliestform was to use burlap screens through which the
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Notes on Heating and Ventilation 267 air passes. These screens work fairly well but thefiner dust will always be carried through tliem. Abetter plan is to pass the air through a sheet orseries of sheets of water. After passing throughthese sheets of water the air is passed through anapparatus which removes the excess of water. Fig.78 shows the general arrangement of an air wash-ing system. As you will notice from the figure, theair first passes through a tempering coil whichraises the temperature from 60 to 70 degrees, thenpasses through the sprays or sheets of water, thenthrough the eliminator where the excess of wateris removed and then it passes to the heating coilsto be heated. The water used for washing the airis circulated over and over again by means of asmall centrifugal pump driven by a motor. Insome cases it is desirable that the air should becooled. This may be done by placing cooling coilsin the tank where the water collects after havingwashed the air, and reducing the tem

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