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Thermodynamics filled in class notes_Part_31

# Thermodynamics filled in class notes_Part_31 - 69 2.10...

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2.10. REFRIGERATION 69 The compressor work is ˙ W c = ˙ m ( h 2 h 1 ) , (2.464) = parenleftbigg 0 . 008 kg s parenrightbiggparenleftbiggparenleftbigg 205 . 1 kJ kg parenrightbigg parenleftbigg 195 . 78 kJ kg parenrightbiggparenrightbigg , (2.465) = 0 . 075 kW. (2.466) Now one desires the heat which leaves the cold region to be high for a good refrigerator. This is the heat transfer at the low temperature part of the T s diagram, which here gives ˙ Q L = ˙ m ( h 1 h 4 ) , (2.467) = parenleftbigg 0 . 008 kg s parenrightbiggparenleftbiggparenleftbigg 195 . 78 kJ kg parenrightbigg parenleftbigg 74 . 59 kJ kg parenrightbiggparenrightbigg , (2.468) = 0 . 9695 kW, (2.469) = parenleftbigg 0 . 9695 kJ s parenrightbiggparenleftbigg 60 s min parenrightbigg parenleftBigg 1 ton 211 kJ min parenrightBigg , (2.470) = 0 . 276 ton. (2.471) The units ton is used for power and is common in the refrigeration industry. It is the power required to freeze one “short ton” of water at 0 C in 24 hours. It is 12000 Btu/hr , 3 . 516853 kW , or 4 . 7162 hp .

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