File:Transactions - American Society of Heating, Refrigerating and Air-Conditioning Engineers (1895) (14782735432).jpg

Identifier: transactionsame21amer (find matches)
Title: Transactions - American Society of Heating, Refrigerating and Air-Conditioning Engineers
Year: 1895 (1890s)
Authors: American Society of Heating, Refrigerating and Air-Conditioning Engineers
Subjects: Heating Refrigeration and refrigerating machinery Air conditioning
Publisher: New York : The Society
Contributing Library: Gerstein - University of Toronto
Digitizing Sponsor: University of Toronto

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ordinary speeds and with various possibilities asto air inlets and outlets. The significant bars of the chart, repre-senting cars where no intakes in addition to crevices were pro-vided, are the first, fifth and seventh. Unaided by exhaust ventila-tors the average air supply through crevices alone was only 18,500cubic feet per hour; aided by exhaust ventilators the averages were40,600 and 53,000 cubic feet per hour for wooden and steel carsrespectively. The difference between the latter two is believed todepend on the almost total absence in the steel car of crevices inits upper portion by reason of the absence of deck-sashes and aconsequent absence of short-circuiting of air currents from deck-sash crevices to ventilators necessarily close at hand. There is inconsequence a more constant withdrawal from below, and a morerapid changing of the air of the lower levels. The average occu-pancy of the cars represented in Chart 1 was about fifteen people 282 THE VENTILATION OF SLEEPING CARS
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THE VENTILATION OF SLEEPING CARS 283 each, from which it follows that there was considerably more than2,000 cubic feet of air per hour for each occupant in the carsequipped with exhaust ventilators, while there was only about 1,200cubic feet per occupant in those not so equipped. Since the figuresapply only to the twelve-section body, the practical maximum occu-pancy is about twenty-five people. In Chart 2 are shown the relative average air supplies per person,as determined by the CO, content, for the upper berth, lower berth,and aisle of cars ventilated by open deck-sashes, and of wooden andsteel cars ventilated by the exhaust method with only crevices asinlets. All berths were occupied by one person each, and each groupof cars contained an average of about sixteen people. The air sup-ply is seen to be considerably larger with the exhaust type of ventila-tion ; and it is sufficient to meet the physical as well as the chemicaldemands placed upon it. Not only is the average volume of a

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