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每小时将200kg过热氨气(压强为1200kPa)从95℃冷却、冷凝为饱和液氨。已知冷凝温度为30℃。采用冷冻盐水为冷凝、冷却剂,盐水于2℃下进入冷凝、冷却器,离开时为10℃。求每小时盐水的用量。 热损失可以忽略不计 数据: 95℃过热氨气的焓,kJ/kg 17 30℃饱和液氨的焓,kJ/kg 323 2℃盐水的焓,kJ/kg 6.8 10℃盐水的焓,kJ/kg 34
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