Document NEz4LVenbjXo9d1xNQM1omqgD

926 CHAPTER 43 ** 195X:Guide ifying must not berieglected, when this feature is included-in the equipment** - . ;i>. BIBLIOGRAPHY Modern Air Conditioning, Heating and Ventilating, by W. H. Carrier, R. E. Cheme, and W. A. Grant--Chapter .lv (Pitman Publishing Corp., 1940). Predicting Operating Hours.of Refrigeration Equipment Used in Air Conditioning, by W. A. Grant {Refrigerating Engineering, July, 1941). Cost of Operation of Refrigeration Used for. Air. Conditioning, by R..E. Cheme {RefTigerating^EngineeringtX>ecQmber, 1943).. / `V - : f r\f :U *-o >- Cj CHAPTER 44 ; INDUSTRIAL AIR CONDITIONING General Requirements for Manufacture, Processing and Preservation; Classifi cation of Problems; Moisture Content and Regain; Conditioning and Drying; Chemicaljand Biochemical Reaetions'.^CrysUtilization; Control for Machining, Polishing, and for Static Electric; ity.Elimination; Laboratory Conditions; Calculatdons; Safeguarding Health and Maintaining ' Safety; Contaminant Control; Dilution Systems for Contaminants; Heat Storage; Radiation; Odors INDUSTRIAL air conditioning is concerned with (I) the manufacture; processing and preservation of material, equipment and commodities; and (2) the atmospheric conditions required for maintaining the health, safety and efficiency of workers. The material in this chapter is treated under these two divisions. GENERAL REQUIREMENTS FOR MANUFACTURE, PROCESSING ANDJPRESERVATION . Table 1 .lists the temperatures and relative'humidities required for storage of certain commodities, and for manufacturing and processing of others. The desirable relative humidity may range from a low of 5 per cent in certain industrial applications, such. as insulation winding proc esses, up to a condition approaching saturation, as in processes relating to textile, tobacco and baking industries. The'most favorable temperature and relative humidity will vary accord ing to the specific material and particular process. In some cases the temperatures and relative humidities listed in Table 1 have no direct in fluence upon the product itself, but do affect the efficiency of employees, and in'turn affect workmanship, uniformity and the cost of production. Sometimes,_a "compromise between the known optimum condition for processing and that required for worker comfort is unavoidable. In many, processes, the optimum air' conditions are variable according to the stage and progress of the processing cycle from the raw material to the finished product. Some materials, such as cotton textiles, begin with a low relative humidity in the carding and picking rooms, and after passing through the various intermediate steps with a gradual increase of relative humidity, are. subjected to relative humidities of from 70 to 85 percent in the final stage of weaving. Other processes encountered require the re versed procedure, starting with a high relative humidity and finishing with a low; relative humidity, as in the manufacture of glue and gelatinous materials, and in making various types of gelatine capsules. In order to apply air conditioning to industrial processes, the air condi tioning engineer must have a thorough understanding of the processing problems involved. Individual processes and machines are changing rap idly, and air conditions must be revised constantly to meet the new. conditions. Air conditioning for industrial processes is so extensive and 927