. Bulletin of the Department of Agriculture. Agriculture; Agriculture. 62 BULLETIN U. S. DEPARTMENT OF AGRICULTURE. erating machines, even though the creamery is already equipped with a steam engine. This will depend, however, on the arrange- ment and efficiency of the steam plant and on the cost of electric power and must be determined in each individual case by those on the premises. The cost of power per ton of refrigeration as averaged from steam-driven plants in operation will compare with electric drive at about 3 cents per kilowatt-hour. There are other advantages in employing elec
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. 62 BULLETIN U. S. DEPARTMENT OF AGRICULTURE. erating machines, even though the creamery is already equipped with a steam engine. This will depend, however, on the arrange- ment and efficiency of the steam plant and on the cost of electric power and must be determined in each individual case by those on the premises. The cost of power per ton of refrigeration as averaged from steam-driven plants in operation will compare with electric drive at about 3 cents per kilowatt-hour. There are other advantages in employing electric drive over steam, the value of which can not be estimated in dollars and cents, viz, cleanliness, less space required, and that the power required can be determined accurately at any Fig. 29.—Maximum and average summer temperatures in different States. Cleanliness in milk plants, creameries, and dairies is of special advantage, and with electrical drive practically all the dirt arising from smoke, coal dust, and ashes is eliminated. It is possible to install electric motors in out-of-the-way places where engines could not be located. This feature makes it practical to locate the refrigerating machine close to the cooling rooms, thereby eliminating long leads of refrigerating piping located outside the rooms to be cooled. The fact that the power required to operate the compressor can be determined accurately at any time is of great importance. This feature, however, may not seem of very great value at first thought, but it has been proved in many instances to produce higher economy. That the cost of production can be determined accurately is due to the fact that the cost of power is given in each monthly bill or, for that matter, can be calculated each day from the meter readings. With exact figures at his command the operator is able to detect. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readabilit
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