Thermal efficiency of furnaces can be improved by
(A) Waste heat recovery from flue gas
(B) Minimising heat losses from furnace walls
(C) Maintaining proper draught
(D) All (A), (B) and (C
(A) Waste heat recovery from flue gas
(B) Minimising heat losses from furnace walls
(C) Maintaining proper draught
(D) All (A), (B) and (C