It is seen that in a given powerplant and at constant turbine inlet temperature, represented, for
example, by line 1, the steam-to-air ratio cannot be raised much before critical operating conditions
are reached. When the turbine inlet temperature is reduced and the compressor is to
operate, say, in its design point (PCd ¼ 15), a corresponding additional steam flow must be
admitted. But this does not seem to raise the normalized powerplant output appreciably. As the
turbine inlet temperature continues to be reduced, the normalized powerplant output is reduced as
well. The desired increase in normalized powerplant output is achieved, however, when a compressor
of lower flow capacity is used in combination with the original turbine. The reverse, i.e.,
the original compressor and a larger turbine, applies as well.