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η=(150-t)/(150-25)=0.96,

t=30��;

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Q=4000x1.2x0.24x(150-30)=138240kcal/h;

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138240x0.85=117504 kcal/h;

�ύ�Q��ˮ�Ĝ��飺

��t=117504/24x1000x1=4.89;

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