Author: National Dairy Union

Publisher: Rarebooksclub.com

Published: 2013-09

Total Pages: 106

ISBN-13: 9781230044330

This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1902 edition. Excerpt: ...a surface of 8,000 square inches and from ten to thirty degrees of heat removed in five seconds. An eight gallon can of milk will flow over the cooler in about twelve or fifteen minutes and lose from twenty to twenty-five degrees of heat by simply using the ordinary well water. The same can if set into a tub of water at the same temperature would require from one hour to one hour and a half to accomplish the same result. The efieict'iveness of a cooler depends upon the area of exposure and the degree of coldness that may be maintained within itself to abstract the heat. N 0 cooler will abstract more heat than it gives off. If one hundred pounds of freshly drawn milk passes over it and gives off twenty-five degrees of heat, it will necessitate that one hundred pounds of water be used at a temperature of fifty degrees. If it is desired to cool the milk more than twenty-five degrees it will require a greater proportion of water. To cool one hundred pounds of milk on a cooler will require as much water to cool it standing in a tub, less the amount of loss from radiation due to the longer exposure. The surface exposure of the ordinary shotgun can is 440 square inches. and eight gallon milk can is 872 inches, but the layer of milk in contact with the surface is not changed rapidly. A series of tests were made of the cooling of milk as set in the ordinary can and set in the tub, by suspending thermometers at distances of one inch from the surface to the center. The milk was not agitated and the cooling was more uniform than was anticipated. Milk seems to be a better conductor of heat than water, and while the difference in temperature of the water on the outside and the milk on the inside was quite marked, currents were set up that made the...