Refrigerant design

It is desired to design a refrigerant that can absorb heat at temperatures as low as 30°F (- l.rC) and reject heat at temperatures as high as 110°F (43.3 C). For the design, consider 13 molecular groups CH3, CH2, CH, C, OH, O, NH2, NH, N, SH, S, F, and Cl. When combining these groups, compounds with double or triple bonds, which tend to polymerize, should be avoided. Also, compounds 

Normal boiling point and critical properties (Joback and Reid, 1987). 

Vapor pressure—Riedel-Plank-Miller method (Reid et al., 1977). 

At normal boding point— Vetere modification of Kistiakowsky eqn. (Duvedi and Achenie, 19%)  

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Baggio, J. L., Optimize Refrigeration Design, Hydrocarbon Processing Gulf Publishing Company, Houston, Texas, V. 63, No. 1, p. 97 (1984). A1 rights reserved. 

Because these molecules form bubbles on their own, because the association of molecules is indiscriminate, and because a particular individual molecule is not necessary to form a membrane, it is difficult to infer intelligent design from cell membranes. Like the stones in a stone wall, each of the components is easily replaced by a different component. Like the mold on my refrigerator, design is not detectable. 

Food should be stored in cabinets or refrigerators designated for such use only. 

Lood should be stored in cabinets or refrigerators designated for such use only. Mechanical pipetting devices should be used and mouth pipetting prohibited. All hazardous chemicals should be used in a chemical fume hood. 

Compounds are listed by their ASHRAE standard refrigerant designations (Reference 1), which appear in the first column. These codes are often prefixed by symbols such as CFC- (for chlorofluorocarbon), HCFC- (for hydrochlorofluorocarbon), or simply R- (for refrigerant). The molecular formula and CAS Registry Number are also given. The properties tabulated are ... 

CRISPER - Drawer or compartment in refrigerator designed to provide high humidity aiong with low temperature to keep vegetables, especially leafy vegetables - cold and crisp. 

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