21.The design of the waste-heat boiler heat transfer surface is largely a problem of convective heattransfer, and in principle is the same as for the oil-fired boiler designs, except that the intertuberadiative conductance will be so low that it can be neglected. Based on this description, whichstatement is false?
(A)The intertube radiative conductance in a waste-heat boiler is an important factor to beconsidered.
(B)The convective heat is a significant problem for evaluating the heat transfer surface in a boiler.
(C)The intertube radiative heat is negligible due to its relatively low value in a waste-heat boiler.
(D)The design of the waste-heat boiler heat transfer surface is the same as the design of oil-firedboiler in principle.