. Capacity and efficiency test of an autovacuum refrigerating machine. 16. The system must be free from air, tc get max-imtim efficiency. The proper time to get the airout is when the gauge shows some pressure justbefore it is tine to boil off. Connect a pieceof hose to purge valve, drop the free end intoa bucket of water, then open purge valve slight-ly. The air will pass into the , formingbubbles. If there are no bubbles, or only a fewsmall ones, the apparatus is free of air. Purg-ing need only be done Yjhen pressure is shovm onthe gauge at the end of the absorption periodor when the
. Capacity and efficiency test of an autovacuum refrigerating machine. 16. The system must be free from air, tc get max-imtim efficiency. The proper time to get the airout is when the gauge shows some pressure justbefore it is tine to boil off. Connect a pieceof hose to purge valve, drop the free end intoa bucket of water, then open purge valve slight-ly. The air will pass into the , formingbubbles. If there are no bubbles, or only a fewsmall ones, the apparatus is free of air. Purg-ing need only be done Yjhen pressure is shovm onthe gauge at the end of the absorption periodor when the liquor is all back in the generator-absorber as indicated by the height of liquor inupper gauge glass. A/c. 17. D. Boil to about a four or five pound pressuregauge reading and fill up sampling tube, throughsampling valve on the tank of generatorand absorber. Cool this liquor in samplingtube to sixty degrees Fahrenheit and insertBeaume Hydrometer scale, cind note reading. AS commercial aqua-ammonia is only twenty-six degrees Beaume, it will be found advcintagesto charge machine fully with this and afterboiling off thoroughly draw off through samplingvalve such an amount of weak liquor as may benecessary, and put in sufficient tv/enty-six tobring the strength up to twenty-eight. It will do as good refrigeration with twenty-six as it will with twenty-eight but it will notdo as much. The apparatus gives the grf^cttestefficiency when the Beaume scale reading, at six-ty degrees Fahrenheit, is twenty-eight degreesBeaume. The brine to be lised should be ninetydegrees Saloraeter at sixty degrees Fahrenheit. Thebrine is a mixture of calcium chloride and water. /V,. 6.
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