. Canadian foundryman (1921). n air is then pas-sed over the heater sections which areserved by steam and on leaving the heat-ers is distributed throughout the plantthrough a suitable system of sheet ironduct work. tips and blow across again. You cer-tainly can notice the difference. Thiscoolness is due entirely to the evapor-ation of the moisture. It takes an enor-mous quantity of heat to evaporate onepound of water, more than the averageperson has any conception of. To evap-orate one pound of water at 70° F. re-quires 1052 B. T. U. whrch equals 818,456foot lbs. This amount of work is theequi
. Canadian foundryman (1921). n air is then pas-sed over the heater sections which areserved by steam and on leaving the heat-ers is distributed throughout the plantthrough a suitable system of sheet ironduct work. tips and blow across again. You cer-tainly can notice the difference. Thiscoolness is due entirely to the evapor-ation of the moisture. It takes an enor-mous quantity of heat to evaporate onepound of water, more than the averageperson has any conception of. To evap-orate one pound of water at 70° F. re-quires 1052 B. T. U. whrch equals 818,456foot lbs. This amount of work is theequivalent of lifting a man weighing 150lbs. to the top of a mountain one milehigh. Air will always tend to absorb watervapor. During the summer months noheat is added to the water in the washerand the only source of heat to evaporatethe water absorbed by the air is the airitself and each grain of moisture absorbedper cu. ft. will reduce the temperatureof the air °. It is not uncommon tocool the incoming air 15° which is an. A typical noon-hour scene in the regular run of foundries. Note the heating and venti-lating system in the center of the group. Motto:—Anything is good enough in thefoundry, so long as the fellows will stand for it. This system is particularly adaptedfor heating and ventilating work for theair required for ventilation is made themedium for introducing the heat neededto make the plant interior liveable. Thusone apparatus serves both needs. An-other fact not generally understood isthat washing air will cool it so that dur-ing extreme warm weather a coonng of15 can be effected. This is a strongpoint in favor of a fan heating and vent-ilating system. Cooling in the summer is effected with-out additional expense and without chang-ing the adjstment of the aparatus usedfor winter service. This cooling is doneby the evaporation of some of the waterin the air washer. Just blow yourbreath across the tips of your fingersIt feels quite warm. Now moisten the appreci
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectfoundri, bookyear1921
