Title: Heating, Ventilating, and Cooling of Passenger Cars
text: MANY question whether a complete job of air-conditioning passenger cars for all weather conditions can be done at a price which most car buyers care to pay and with assurance that dependable and acceptable results can be guaranteed, Mr. Chase reports in prefacing this paper, a comparative study of existing heating, ventilating, and cooling systems. Some 1939 and many more 1940 car models, he believes, yield greatly improved results in heating the entire car and ventilating it well with all windows closed, but, he points out, the design of such systems is still in a state of flux. Mr. Chase divides all currently available systems into four classifications for convenient discussion: (1) heating by recirculation only, ventilation incidental; (2) heating in which part of the air is recirculated and part taken from outside and can be heated before delivery; (3) heating in which all air passing through heater is taken from outside; (4) systems which include means for heating, cooling by refrigeration, and at least incidental circulation. The author describes and compares current systems in each of the classifications and comments on the problems, advantages and disadvantages involved in each of the designs. He includes also structural considerations, mentioning that, except for compressors, valves, and a few other somewhat special parts, most of the components of all these systems are produced largely from sheet metal or are die-cast in zinc alloy.