The wonders of modern mechanismA résumé of recent progress in mechanical, physical, and engineering science . equired only because ammonia is expensive andmust be used over and over. To utilize the cold producedby this form of apparatus either of two methods is em-ployed—the brine system or the direct-expansion the brine system the congealer contains numerousammonia-evaporating coils, that are surrounded by a strongbrine made with common salt, which does not freeze evaporation or expansion of the ammonia in thesecoils robs the brine of heat, the process of thus storingcol
The wonders of modern mechanismA résumé of recent progress in mechanical, physical, and engineering science . equired only because ammonia is expensive andmust be used over and over. To utilize the cold producedby this form of apparatus either of two methods is em-ployed—the brine system or the direct-expansion the brine system the congealer contains numerousammonia-evaporating coils, that are surrounded by a strongbrine made with common salt, which does not freeze evaporation or expansion of the ammonia in thesecoils robs the brine of heat, the process of thus storingcold in the brine going on continuously, and being regula-table by a gas-expansion valve. This brine may then becirculated by means of a pump throughout the rooms orapartments which it is desired to cool, much after the man-ner in which we circulate heat in steam-pipes. In thedirect-expansion system there is no brine used, but the ICE-MAKING AND REFRIGERATING. 321 expansion- or evaporating-coils are placed directly in therooms which it is desired to cool, so that the air is reducedin temperature. Fig. SECTIONAL \^EW OF THE FRICK COMPANYS ICE-JIAKING MACHIKE. The brine system is considered preferable to the direct-expansion system for several reasons. It requires the useof less ammonia, a saving in first cost. The danger of 322 WONDERS OF MODERN MECHANISM. leakage of the ammonia is much less, since it is all containedin one room, or two at most, and not distributed all overthe premises. Leaking ammonia is deleterious to goods aswell as to human beings. The pumping machinery can bestopped at night, with very little increase of temperature,whereas in the direct-expansion system the frost on thepipes is depended upon to maintain the cold at uight, andtends to melt and fill the rooms with moisture that is aptto be damaging to goods. The machines used for refrigerating by the above-described process are a compressor-pump and steam-enginecombined, the one shown in the illustrati
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Keywords: ., bookcentury1800, booksubjectmachinery, booksubjectmechanicalengi
