N-FWH

Feed Water Heaters improve boiler and power cycle efficiency by preheating feedwater using extracted or waste steam — a well-established, high-value efficiency measure in any steam cycle, but one that depends entirely on correct sizing to deliver its promised gain.

N-FWH software calculates thermal performance, tube bundle sizing, and drain cooling zone design specific to feedwater heating service — including the condensing and subcooling zones that distinguish a proper feedwater heater from a generic shell-and-tube exchanger pressed into the same role.

The edge: feedwater heaters have design considerations most generic heat exchanger tools don't account for — deaerating requirements, drain cooling zone sizing, and integration constraints with the broader steam cycle. Our tool is built around feedwater heating specifically, not adapted from a general-purpose exchanger calculation.

The tool models the full three-zone design where applicable — desuperheating, condensing, and drain cooling — since treating a feedwater heater as a single-zone exchanger is a common simplification that produces an optimistic and ultimately inaccurate performance estimate.