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Stack temperature is measured alongside the flue gas composition because the loss depends on

  • A.the composition alone
  • B.the ambient temperature rather than the stack temperature
  • C.both the excess air and the temperature at which it leaves
  • D.the temperature alone

Answer: C

The heat carried away is the mass of gas multiplied by its specific heat and by the rise above ambient, so both the quantity and the temperature enter. A high stack temperature with correct excess air points at fouled heat transfer surfaces instead.

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