. Official proceedings . the liquid ex-pands into a gas, lowering its temperature, and when so doingcools the car air. This gas then returns to the compressor. Air-conditioning must be provided whether the car is mov-ing or standing. Also, parked sleepers, etc., may be cooled forseveral hours, which is beyond the capacity of the battery. Toprovide for this pre-cooling, an AC-DC driving motor has beenpro\ided. When the train is moving, or during intermediatestops, the compressor operates from 32 volts When pre-cooling, commercial 220 or 440-volt central station power canbe used. During thi
. Official proceedings . the liquid ex-pands into a gas, lowering its temperature, and when so doingcools the car air. This gas then returns to the compressor. Air-conditioning must be provided whether the car is mov-ing or standing. Also, parked sleepers, etc., may be cooled forseveral hours, which is beyond the capacity of the battery. Toprovide for this pre-cooling, an AC-DC driving motor has beenpro\ided. When the train is moving, or during intermediatestops, the compressor operates from 32 volts When pre-cooling, commercial 220 or 440-volt central station power canbe used. During this pre-cooling period, the motor actsas a generator to charge the battery if required. Air-Conditioning Unit: The air-conditioning unit may be furnished in one or moresections, depending upon the best arrangement for the car inquestion. These units consist of the heating and cooling coils,over which the circulated air is passed by the fans. The totalamount of air circulated ranges from 2000-2500 cu. ft, per The Air Conditioning Unit which fits intothe car roof cools, heats, humidifies, de-humidifies and ventilates. Outside air, about 25 percent of the total, is drawn in backof the unit through filters in the deck. The remaining 75 per-cent is recirculated in the car. The use of forced draft creates 168 a slig-ht pressure in the car, causing all air passing- throughwindow cracks, etc., to be out, not in. Hence all dirt is keptout. By constantly bringing in such large volumes of new air,a complete air chang^e is obtained every few minutes. As the air passes over the cooling coils, it is cooled to about60 degrees. In the process of cooling water is removed. Theair then passes into the upper air of the car w^here it is mixedwith the warmer car air. This cold air blanket slowly descendsover the entire car, and then is returned again to the air-condi-tioning unit by forced draft. The air distribution systemmust be so designed that the air is uniformly distributed with-o
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