140 



MARKET DAIRYING 



Refrigerating Capacity. To speak of a machine of 

 one ton refrigerating capacity, means that it will pro- 

 duce, in the course of twenty-four hours, the amount 

 of cold that would be given off by one ton of ice at 32° F. 

 melting into water at the same temperature. Its actual 

 ice making capacity is about 50% less. 



Size of Compressor. If the equivalent of five hun- 

 dred pounds of ice is needed per day, then a half ton com- 

 pressor will answer, provided it is run twenty-four 

 hours a day. But since it will not likely be convenient 

 to run the compressor more than six hours a day, a ma- 

 chine four times this size will be' necessary. The larger 

 the compressor the shorter the time it needs to be run. 

 A two-ton refrigerating machine will be large enough 

 for a fifty-cow dairy. 



Power Required to Operate. The power required 

 per ton of refrigeration is less the larger the machine. 

 With a two-ton compressor, the power required is about 

 two and one-half horsepower per ton of refrigerating 

 capacity in twenty-four hours. 



