. Bulletin of the Department of Agriculture. Agriculture; Agriculture. 3 SCRATCHED fOLLOW T/i.£ f«»fflflL WOOL WALL CONSTfTUCTIOn FIREPROOF OTO )-l'--'l> o;;: -â £â â. wall ooHSTFtucrion,woon is 1*4 coMC«cre « >3 fir) fwrC/fM'B ciMmr^uurfu f£Ba*.TPAt'En 4-''MINER.*!- fcVOOL ono In most small creameries the engine is ordinarily run for only two or three hours while the churning, working the butter, and pasteuriz- ing is being done. The balance of the day the fire in the boiler is banked and only 10 to 15 pounds' pressure is kept on the boiler. If, in orde
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. 3 SCRATCHED fOLLOW T/i.£ f«»fflflL WOOL WALL CONSTfTUCTIOn FIREPROOF OTO )-l'--'l> o;;: -â £â â. wall ooHSTFtucrion,woon is 1*4 coMC«cre « >3 fir) fwrC/fM'B ciMmr^uurfu f£Ba*.TPAt'En 4-''MINER.*!- fcVOOL ono In most small creameries the engine is ordinarily run for only two or three hours while the churning, working the butter, and pasteuriz- ing is being done. The balance of the day the fire in the boiler is banked and only 10 to 15 pounds' pressure is kept on the boiler. If, in order to operate a refrigerating plant, it is necessary to keep a greater pressure on the boiler and to operate an engine which is a great deal larger than is required for the compressor, the cost per ton of refrigeration will, of course, be greatly in excess of what it would be if the engine was of suit- <^^^^^^^^ 1 awe size f°r operating the compressor only. Again, the refrigerating machines are often operated intermit- tently, thereby increasing the cost per ton of refriger- ation above what it would be if run continuously. In view of the above, it is im- practical to arrive very closely at the actual cost per ton of refrigeration when the compressor is operated by a steam engine which is also used for driving other machinery. The curves in figure 30 (p. 63), showing the approx- imate cost of producing re- frigeration in creameries with belted, steam-driven equip ment, has been aver- aged from reports on adarge number of creameries, and in view of the fact that the engines were used for pur- poses other than driving the refrigerating machines, it should be borne in mind that the results are only approximate and should not be considered as positive. The cooling water supplied to the condenser and the wages of an attendant have not been taken into consideration in averaging the cost of producing the refrigeration. The water in most cases costs little or noth
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