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Cork insulation; a complete illustrated textbook on cork insulation ...

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STRUCTURAL SUGGESTIONS 191<br />

freezing the moderately cooled air does not drop to the floor<br />

of the room as swiftly as if it were chilled to a lower tem-<br />

perature. That is, in rooms operating above freezing, the air<br />

circulati<strong>on</strong> is naturally sluggish, although the process of heat<br />

interchange, by means of the positive circulati<strong>on</strong> of the air,<br />

is essential. Room design must therefore promote air circu-<br />

lati<strong>on</strong> as much as possible, to keep it positive and active,<br />

especially in rooms used for products c<strong>on</strong>taining much moist-<br />

ure, such as butter, poultr}- and meats, particularly if such<br />

products are put in warm for quick chilling; because such<br />

moisture must be taken up by the circulating air and carried<br />

quickly to the coils and there deposited as frost. Otherwise,<br />

with poor circulati<strong>on</strong>, moisture will c<strong>on</strong>dense <strong>on</strong> the finish of<br />

the insulated surfaces, <strong>on</strong> the goods stored, or remain in the<br />

air of the room to make it damp and mouldy.<br />

94.—Types of Bunkers and Details of C<strong>on</strong>structi<strong>on</strong>.—The<br />

<strong>on</strong>e positi\e way to guarantee a definite circulati<strong>on</strong> of air<br />

throughout a cold storage room is to c<strong>on</strong>struct a separate<br />

cooling room, or coil bunker room, install air c<strong>on</strong>veying ducts<br />

from the coil room to and into the cold storage room, and by<br />

means of blower equipment circulate or pass the air of the<br />

cold storage room through the system and over the cooliiig<br />

coils at a predetermined rate. This method of positive circu-<br />

lati<strong>on</strong>, or cold air distributi<strong>on</strong>, is frequently employed in fur<br />

rooms, candy dipping rooms, freezing rooms, or wherever the<br />

demand justifies the initial expense for such extra equipment<br />

and the cost of its subsequent operati<strong>on</strong>.<br />

By far the most effective natural means of insuring active<br />

circulati<strong>on</strong> is the overhead bunker. Air, cooled over such<br />

bunker by c<strong>on</strong>tact with the cooling coils or ice, falls over the<br />

low side of the bunker and to the floor, due to the fact that<br />

cold air is heavier than the warmer air it displaces ; and as this<br />

cold air absorbs the heat of the goods stored as well as the<br />

heat that leaks into the room through the <str<strong>on</strong>g>insulati<strong>on</strong></str<strong>on</strong>g>, doors,<br />

etc., such air rises over the high side of the bunker, circulates<br />

through the coils or over the ice, gives up its excess of heat<br />

to the refrigerant, and begins the cycle over again. Thus the<br />

circulati<strong>on</strong> follows its natural course, and as the bunker ex-<br />

tends the length of the room, the air circulati<strong>on</strong> reaches every

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