APPLICATION OF REFRIGERATION TO HANDLING OF MILK. 



57 



importance, their tightness and ability to be operated quickly is 

 vastly more so. A poor-fitting door that allows the outside air to 

 leak into the room is a source of endless expense ; consequently great 

 care should be exercised in fitting doors in place. Usually it is 

 economy to buy a good design of commercial door, as it will fit better 

 and not be so liable to warp as a door built by the local carpenter. 

 With slow and heavily moving doors which bind and work badly 

 there is a tendency on the part of the workmen to leave them open, 

 allowing the warm outside 



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 INSIDE. 



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air to rush in and replace 

 the cold air. Equal care 

 should be exercised in the 

 construction of windows 

 in the walls of cold-stor- 

 age rooms. They should 

 be constructed of three 

 plates of glass with two 

 half-inch air spaces. The 

 glass plates should be care- 

 fully set in felt and made 

 perfectly air-tight. The 

 drawings of typical con- 

 structions of cold-storage 

 insulations with their in- 

 sulating values are shown 

 in figs. 23, 24, 25, 26, and 

 27; they are taken from 

 tests made by different 

 authorities. 



ESTIMATING THE SIZE OF 

 REFRIGERATING PLANTS. 



In determining the size 

 of machinery for any class 

 of work it is necessary 

 to carefully consider the 

 maximum or peak load that it will be called upon to carry. This 

 often results in having to install a great deal larger machine than 

 would be required if the load were uniform. In no class of machinery 

 is this more apparent than in refrigerating apparatus when applied 

 to the dairy industry. 



In figure 28 (p. 61) are curves showing the relation between the milk 

 supply and the temperature of the air. These curves are plotted from 

 data obtained from the most important dairying States. The milk- 



Ada 



1.19 



ORY 



A3S 



MOIST 



> ISO 



PAMP 



2.10 



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 T^BOAKPS 

 W. P. PAPER. ' 



no 



Fig. 24. 



-B. T. U. transmitted per square foot per 24 hours 

 per degree difference in temperature. 



