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Which is the correct formula of total draught loss?

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Which is the correct formula of total draught loss?

(a) Ht = Hv + Hb + Hc + Hcd

(b) Ht = Hv + Hb – Hc + Hcd

(c) Ht = Hv – Hb + Hc + Hcd

(d) Ht = Hv – Hb – Hc – Hcd

The question was asked during an online exam.

This interesting question is from Draught System in division Steam Generators & Accessories of Energy Engineering

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The correct option is (a) Ht = Hv + Hb + Hc + Hcd

Easy explanation: The total draught required to produce the current of the air and to expel the flue gases is given as follows.

Total draught loss = Velocity head loss at the chimney exit + fuel bed resistance + head loss in

Equipment’s like economizer, air heater etc. + head loss in chimney and ducts

                            i.e.,     Ht = Hv + Hb + Hc + Hcd

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