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My Favorite Sayings: Fired HRSGs are generally more efficient than unfired units Fuel utilization is better in a fired HRSG than in a conventional fired boiler Higher the fin density/surface,lower the heat transfer coefficient Lower the tube side heat transfer coefficient,smaller should be the external fin surface area Specifiy gas flow in waste heat boilers in mass units rather than in volumetric units Gas analysis affects gas properties and hence heat transfer coefficient Boiler fan performance should be checked at the lowest air density condition HRSG temperature profiles can be optimized using HRSG simulation methods Water temperature affects economizer tube wall temperature much more than the gas temperature and hence for corrosion prevention consider raising water temperature Fouling inside tubes is more serious in finned tube surfaces than in bare tube surfaces