單項選擇題以R12為工質(zhì)的制冷循環(huán),工質(zhì)在壓縮機進口為飽和蒸氣狀態(tài)(h1=573.6kJ/kg),同壓力下飽和液體的焓值為h5=405.1kJ/kg。若工質(zhì)在壓縮機出口處h2=598kJ/kg,在絕熱節(jié)流閥進口處h3=443.8kJ/kg,則單位質(zhì)量工質(zhì)的制冷量為()kJ/kg。

A.24.4
B.129.8
C.154.2
D.168.5


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