air or tempered air is being introduced. By manipulation of the dampers controlling the admission of air to the tempered air chambers, it is possible to close 18:0" 'ctrs 3 set Holes ~2% Pipe Drain STEAM JET HUMIDIFIER. entirely all air supply to them when heating the building prior to occupancy, obtaining a cumulative heating effect since, as room after room reaches a temperature of 68°, the hot air dampers are closed by the thermostats, and the hot air supply which has heated them automatically is diverted to hurry up the heating of the remaining cold rooms, until, finally, the entire heating power of all of the indirect radiation in each plenum chamber goes to the slowest room to heat. The rooms which have reached 68° are, of course, not ventilated during this period, but are stagnant, since all tempered air is closed off. There is no objection to this procedure if used prior to the arrival of the pupils; moreover, it is an effective step toward economy. LOCATION OF AIR INLETS AND OUTLETS. The air enters the standard classrooms about 7 ft. above the floor, and leaves them under the bottoms of the sliding wardrobe partitions, which also carry the blackboards. Passing upward over the clothing in the wardrobes, the air passes in flues to the attic. In most cases, the wardrobes are on the same sides of the rooms as the inlet openings, but in some cases they are directly opposite. In the auditorium, the air enters through a large number of evenly distributed floor registers beneath the seats, and leaves mostly at the floor level, through flues in the outside walls. In some other rooms, of special type, the air leaves the rooms through registers at the floor level, on the same side of the rooms as the supply openings. The toilet rooms are ventilated by separate flues and are so arranged that the toilet room air can not be recirculated. The general building vent flues are connected in the attic with metal ducts to two outlet chambers. These are open at the top to roof ventilators, and at the bottom to large grilles on the ceiling of the third floor. Pneumatically-operated dampers permit the air to escape out of doors, or to pass down into the corridor, when it is desired to recircu late the air. SIZES OF APPARATUS: Boiler plant-1,200 H.P., in central plant, which supplies several other buildings in the Englewood High School group. Supply fan-Multiblade type, 70-in. wheel, double wide, double delivery, double inlet, capacity about 90,000 cu. ft. per minute at 160 R.P.M. Engine-Direct-connected, 11 in. X 16 in., throttling, about 160 R.P.M. Tempering Heaters-2,860 sq. ft. surface, 1 in. pipe in cast-iron bases, center-bottom single, pipe connection. Reheaters-4,292 sq. ft. surface, 1 in. pipe in bases of the same type. Tests were made by employees of the Chicago Commission on Ventilation, using the standard methods and appliances of the commission, described in general in the appendix to the 1914 report. In addition to those devices, the dust counter of Dr. E. V. Hill, 1917 type, was used instead of the Aitken dust counter. Unless otherwise stated, air volumes were taken as described, by calibrated anemometer. The temperature readings, unless stated otherwise, were taken at 4 ft. above the floor. Preliminary tests, to establish familiarity with the practice, and for development of the program, were made at various times in January and February, 1917. The dates of the various tests appear on the charts. The various conditions observed will be presented in next month's issue of THE HEATING AND VENTILATING MAGAZINE under the following heads, as observed in the various rooms: (1) Air volume (distribution, motion); (2) Temperature; (3) Moisture; (4) Dust; and (5) Bacteria. Test sheets will also be shown covering observations of rooms 104, the kindergarten and Rooms 201, 209, 301, 304 and 305. BY tions in the great army encampments are practically complete, as far as the plans laid out by the Constructing Quartermaster's office are concerned, but our readers will not fail to notice that where stove heaters have been installed the government officials, as well as heating men generally, have gone on record as stating that this type of heater was used only on account of the exigencies of the situation and that "as a general proposition steam heating would have been favored above furnace heat, but the element of time was the deciding factor." Again, in the recent discussion in these columns of the substitution of "squad houses" for the regulation army barracks, it is stated that "the best system would be steam heat from a central plant and cast-iron wall radiators in the barracks." The barrack buildings constitute the greater part of each cantonment; at Camp Upton, for instance there are 359 barrack buildings. It is becoming more evident every day that these cantonments are not to be temporary propositions but are to serve as permanent training quarters, not only during the present war, but afterwards, when compulsory military service becomes the law of the land. It is, therefore, of great importance that the makeshift of stove heat for the barracks should be replaced by adequate heating systems as soon as possible and it is none too soon for heating engineers to take up this matter and be prepared, when the first lull comes, to do their part in equipping the camps for permanent service. WE TAKE pleasure in announcing this month that through an arrangement with the Chicago Commission on Ventilation, THE HEATING AND VENTILATING MAGAZINE will hereafter represent the commission to the extent of publishing all reports of its tests and experiments. These reports will appear exclusively in this magazine, except that separate copies will be published by the commission for special distribution. Although the commission has published only one report, in 1914, it has not been idle by any means. The investigations and tests it has carried on not only cover a wide range, but have been made, as far as possible, on strictly practical lines in rooms or buildings of full size. As nothing, since the 1914 report, has appeared, dealing with the commission's work, our readers may look forward with unusual anticipation to the forthcoming issues. Each issue will be devoted to one report or more, the first being that of the ventilation tests made early this year in the Lewis-Champlin School, Chicago. Air Cooling in A Chewing Gum Plant One of the most interesting features of air cooling is its application to buildings, not for the sake of comfort, but for the purpose of making certain manufacturing processes a success. There are many manufacturers today who are experiencing troubles whose remedy lies unknowingly only in proper air conditioning, not alone as far as temperature is concerned but also in regard to the relative humidity which is best suited to the particular operation concerned. Gum manufacturers knew that on certain days the gum got too soft, and on other days it got too hard and brittle but they did not know the remedy, and it has been due solely to the initiative of certain manufacturers of air conditioning equipment that the remedy is now being applied, resulting in more perfect work and higher efficiency throughout. Such an installation was recently installed by the Carrier Engineering Corporation, New York, in the plant of the American Chicle FIG. 1-ARRANGEMENT OF DUCT SYSTEMS IN ROLLING, SCORING, SEASONING AND TRIMMING DEPARTMENTS, AMERICAN CHICLE COMPANY. |