Dry ice (solid carbon dioxide. It can be pressed in various sizes and shapes, blocks or slabs. As it absorbs heat, it changes directly from solid pair. He didn't come in a liquid state. This transition from a solid pair is called sublimation. At atmospheric pressure, solid carbonic acid evaporates in -109'F (-78C).
Figure 3-18A shows a General method with the use of dry ice in the form of frozen products, the refrigerating device. Drv ice (aqua), as a rule, are Packed next to or on top of the food packages. Carbon dioxide, as it changes to vapor, keep food frozen. Dry steam, as a rule, to replace the air in a container or in a Cabinet. This helps to preserve food. This device was developed that uses dry ice for cooling of materials to be transported on the aircraft. Fig. 3-18B. Closed the refrigerant circuit is connected to the evaporator in the space of the store in the refrigerator.. He is also connected to the capacitor is located in the isolated bin. Bin-contains dry ice pellets. The circuit contains a General refrigerant.
Condenser operating at very low temperature ( 109F or 78C)It causes the refrigerant vapor entering the condenser condense quickly fluid.
The liquid refrigerant flows by gravity into the evaporator. No, it absorbs heat, as it evaporates and flows upwards to the condenser. Hence the cycle repeats. The thermostatic control valve to control the flow of refrigerant Hito evaporator. It is located in the liquid line. This arrangement is shown in Fig. 3-18B. Dry ice is typically stored in a largely isolated cases. Never treat him with his bare hands. This will cause instant freeze burns. Always wear heavy gloves.
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