. The street railway review . discharged high up travels toward thewalls where it is cooled and becoming heavier, falls to the floor, thusihe walls assist the circulation. The coldest wall will cool thegreatest amount of air, consequently more air will be drawn in thatdirection. With high outlets no air currents are felt by the occu-pants on the door. These plants are in successful operation whereair is discharged from 100 to 17s ft. from the ends of Ihe building,and in foundriis it is blown as far as 250 ft. Masonry or concrete ducts laid under the floor with stand pipesfrom 8 to 12 ft. high
. The street railway review . discharged high up travels toward thewalls where it is cooled and becoming heavier, falls to the floor, thusihe walls assist the circulation. The coldest wall will cool thegreatest amount of air, consequently more air will be drawn in thatdirection. With high outlets no air currents are felt by the occu-pants on the door. These plants are in successful operation whereair is discharged from 100 to 17s ft. from the ends of Ihe building,and in foundriis it is blown as far as 250 ft. Masonry or concrete ducts laid under the floor with stand pipesfrom 8 to 12 ft. high at intervals are often used. Another methodused is one in which no distributing pipes are employed, but thehot air is discharged from the fan into the building overhead andthe air returned to the apparatus through underground ducts withopenings located at the floor line distributed through the shop. The velocity of the hot air in the main ducts leading from thefan should never be greater than ft. per minute and this ve-. Cve/c ^ser c^ A/)9 Acjp^f/Mt/r^- j»cm juft locity should be reduced gradually in the different branches so thatihc air is discharged from the outlet at from 800 to 1,200 ft. perminute. Where the outlets are high ft. per minute can beused without results, but where a thorough distribu-tion is desired and the outlets are within 6 to 8 fl. from the floorthe velocity of the air should not be greater than 800 ft. per min-ute. Provision should be made for re-circulating the air, also forthe use of cold fresh air from out doors. It is occasionally foundthat a building can be heated easier by using part outside air andpart return air than to use all return air. This is accounted forfrom the fact that where the fan is exhausting from the buildingas in re-circulating the pressure maintained in the building is notgreater than that of the outside air, so that the leakage of airaround windows, doors and crevices may be very great, while by
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Keywords: ., book, bookcentury1800, bookdecade1890, booksubjectstreetrailroads
