84 
BULLETIN 98, U. S. DEPARTMENT OF AGRICULTURE. 
night. The heat that will come through the walls, floor, and ceiling 
during the shutdown period is 
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38,400 B. T. U. and the 
temperature of the brine will rise ' =4.4°. 
The curves in figure 36 show the approximate size and cost of belt- 
driven refrigerating plants for various sized creameries. The curves 
are estimates under average conditions of operation and were checked 
by a large number of such plants now in operation. 
In the construction of the cold-storage room great care should be 
exercised in selecting and installing the insulation. It has been 
shown under the section on insulation that three-fourths of the work 
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Fig. 36. — Curves showing the approximate size and cost of belt-driven compressors for various 
size creameries. 
of refrigeration required for cold storage is utilized in "pumping 
out," so to speak, the heat that comes through the walls, floor, and 
ceiling of the room. In addition to the insulating value of modern 
insulation, it serves as a protection to the goods in storage in case of 
fire, due to its slow burning qualities. 
It is often advantageous 'in creamery cold storage to provide extra 
rooms for the purpose of storing eggs and poultry. They should 
never, however, be stored in the same compartment with the dairy 
products, as they will impart a taint to these goods. 
CENTRALIZED CREAMERIES. 
Centralized creameries, as the name implies, are established for the 
purpose of handling and manufacturing into butter the cream received 
from many outlying stations, or from direct shippers. The outlying 
stations are usually termed "cream-buying stations" and often 
located at a distance of 100 miles or more from the main creamery. 
