I am a gas turbine designer who is new to these forums and I need some help on a strange concept. I've recently run into a situation where increasing HSRG air side pressure loss would be a GOOD thing, if that increased pressure loss allowed for just a little more heat extraction out of the air stream by the HRSG. Currently I believe a high end HRSG for a large gas turbine typically has 3-4% air side total pressure loss - would it be possible to increase the output of the steam turbine by ~0.1% if pressure loss was increased by 1% (i.e. to 4-5% range)? Alternately, could we cut the cost of the HRSG a significant amount if pressure loss was not a concern? Since I know nothing about the details of HRSG design, any insights would be appreciated.
Thanks, Kent L.
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