Document LgXq5Nx4B0Lp04bJe3eqe3m6X

964 CHAPTER 45 .->!> '.1953 Guide Table 1. Temperatures and Humidities Applicable to Industbial Air Conditioning--(Continued) Process I Tem4*.* F FOUNDRIES Core mairing...........................................................................;... Mold making: * Winter design temp. 60 to 70 60 to 70 40 40 to 50 55 to 65 ' The charging room is usually unheated. In core making fume exhaust hoods are required for oven and for cooling areas adjacent to ovens. In mold making provide hoods at transfer points with wet collector dust removal system. Use 600' to 800 cfm per hood. Pouring rooms require two-speed powered roof ventilators. Design for minimum of two cfm per sq ft floor area at low speed. Shielding is required to control radiation from hot surfaces. Proper introduction of air will minimize preheat requirements. In shakeout room provide hoods with wet collector dust removal system;. Exhaust 400 to 500 cfm per sq ft grate area. Roof ventilators are generally not effective. In cleaning room provide hoods for grinders and cleaning equipment, with dry cycloneaor bag type col lectors. Winter ventilation (preheated) is required to the extent of replacing exhausted air. Summer ventilation is usually supplemented by use of pedestal fans. ' Spot coolers are sometimes used in larger installations. Process | FUR FTemp. R.H.% 110 18 to 20 40 to 50 55 to 65 Shock treatment, for eradication of any insect infestations, requires the lowering of the temperature to 18-20 F for 3 to 4 days, then raising it to 60-70 F for 2 days, then lowering it once again-to 18-20 degrees for 2 days and raising it to the storage temperature. Furs remain pliable, oxidation is reduced and color and luster are preserved when stored at 40 to 50 F. Mold growth is prevalent with humidities above 80 percent, while Hair splitting is common where hu midity is lower than 55 percent. Process LEATHER Temp. F R.H.% Drying: Vegetable tanned................................................................ Chrome tanned.................................................................. Storage. ................................................................................ . 70 120 50-60 75 - 45 40-60 After leather is moistened in preparation for rolling and stretching, it is placed in an atmosphere held at room-temperature with a relative humidity of 95 percent. Leather is usually stored in warehouses without temperature and humidity control However, it is necessary to keep humidity below 85 percent to avoid mildew. Air filtration is recommended for toggle machines. Process Temp. F LENSES (OPTICAL) R.H. % Fnsin* Grinding................................................................................. 75 80 45 80 The air must be free of dust and temperature held constant., To acquire desired cleanliness of air a combination of impingement and electrostatic filters are used Dust collectors are required for grinding operations. Industrial Air Conditioning > <565 Table 1. Temperatures and/ Huhuxteies 'Applicable to, Industrial Aib Co NDitioiifNai-^ (Continued) -- - Rooms , - Temp. F LIBRARIES AND MUSEUMS R.H.% 70-80 70-80 40-50 . 40-50 Spray type dehumidifiers used to eliminate SO*. Water treatment is essential to maintain between 8.5 and 9.0 pH. Reheat is usually needed for refrigeration cycle due to the low sensible heat load. . In extremely cold weather a lower relative humidity is required to prevent condensation on walls. ; Positive high and low limit relative humidity controls are used. Do not locate water or steam piping where leakage can cause damage. Check Figures for Cooling Estimates: LOW ; 40 20 30 0.73 0.12 0.92 Medium ,,; 60 1 35 51 0.83 0.23 1.60 Hioh . 80 2 '>=45- 75 0.90 0.40 2.10 MALTING (BREWING) Steeped 24 to 72 hr in 45 to 65 F water. Germinated six days at 55 to 75 F. Kilned at temperatures of 120 to 175 F. . MALTING (DISTILLING) Germinated twenty days at 63 F. Germination produces total heat of 16,000 Btu/bushel at varying rate depending upon grain and process. Process MATCHES Temp. F RJL % Manufacture. Drying........ Storage......... 72 to 74 70 to 75 60 to 62 50 40 50 Water evaporated is 18 to 20 lb.per million matches simultaneously with the setting of the glue. The match machine will turn out about 750,000 matches per hour. Process MUSHROOMS Temp. F R.H.% 120 to 140 60 to 75 48 to 60 32 to 35 nearly sat. . 80 to 85 As spawn starts to grow, it is necessary to abruptly cool the mushroom house by 15 deg in a 12 hr period (approx.). Usually, this is the controlling factor in selection of refrigeration equipment, unless .there is portable equipment available for such a purpose. ' Ductwork is usually of wood, due to the deterioration of ferrous metals during sweating-out period. Air filtration is essential in spawn rooms. Viscous filters are preferred, as mold spores are trapped in the viscous film. Odorless oil should be used. Heat of emission is 4 Btu per (hr)(sq ft of growing surface).