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Unformatted text preview: 2.10. REFRIGERATION 69 The compressor work is W c = m ( h 2 h 1 ) , (2.464) = parenleftbigg . 008 kg s parenrightbiggparenleftbiggparenleftbigg 205 . 1 kJ kg parenrightbigg parenleftbigg 195 . 78 kJ kg parenrightbiggparenrightbigg , (2.465) = . 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 . 008 kg s parenrightbiggparenleftbiggparenleftbigg 195 . 78 kJ kg parenrightbigg parenleftbigg 74 . 59 kJ kg parenrightbiggparenrightbigg , (2.468) = . 9695 kW, (2.469) = parenleftbigg . 9695 kJ s parenrightbiggparenleftbigg 60 s min parenrightbigg parenleftBigg 1 ton 211 kJ min parenrightBigg , (2.470) = . 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 12000in 24 hours....
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