Chapter 11 - Refr iger at ion Cycles I deal Cycle I sent r...

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Refrigeration Cycles Page 1 Ideal Cycle Isentropic compression, P = constant q rejection, Isenthalpic expansion, P = constant q addition COP R = q NETL /w IN = (h 1 – h 4 )/(h 2 – h 1 ); COP HP = q NETH /w IN = (h 2 – h 3 )/(h 2 – h 1 ) 1 2 3 4 State 1 = sat. vapor, State 3 = sat. liquid, s 2 = s 1 , P 3 = P 2 , h 4 = h 3 , P 4 = P 1 superheat friction 1 entropic compression entropic compression with intercooling pressure loss subcooling 2 3 4 Real Process
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Refrigeration Cycles Page 1 Refrigerants should have the following characteristics: I.Thermodynamic: o High h fg o Low freezing temperature o High critical temperature o Positive evaporating pressure o Low condensing pressure II. High dielectric strength of vapor o Good heat transfer characteristics o Satisfactory oil solubility o Low water solubility o Inertness/stability III. Safety: o Nonflammability o Nontoxicity o Nonirritability I.Environmental o Ozone depletion o Global Warming Classifications: 1.1 st digit on the right is # of F atoms 2.2 nd digit from the right is # of H atoms + 1 3.3
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