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【简答题】
Calculate the entropy changes for the heated water and the heating material, and the total entropy changes, when 10(kg) of water is heated from 15.6 to 65.6(°C): a. By saturated steam at 0.7 (MPa) b. By saturated steam at 0.35(MPa) c. By superheated steam at 0.35(MPa) and 176.7(°C) of superheat d. In a perfect countercurrent heat exchanger with 10 (kg) of water at 65.6 (°C) e. In a perfect parallel heat exchanger with the minimum amount of water at 93(°C). Arrange the total entropy changes in the order of increasing magnitude. Explain. In parts a to c, the steam condenses completely but does not subcool.
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