InzonexHRSG methodology
Detailed HRSG model

HRSG heat-loss and plant-impact method

The method calculates the selected component first, then converts retained heat into one plant operating pathway. The support flange and corrugated metal bellows keep their own geometry.

1. Bare metal

Bare heat loss combines outdoor forced convection and thermal radiation. The current planning basis uses 27.7 °C ambient and 3.1 m/s wind.

Q_bare = A_projected × geometry factor × [h_wind(T_s − T_a) + εσ(T_s⁴ − T_a⁴)]

Corrugated metal uses developed area, pitch and depth. The support flange uses a separate flat-area calculation.

2. With insulation

Outside-surface temperature is solved from conduction through insulation to ambient convection and radiation.

(T_s − T_o) / R_ins = h_wind(T_o − T_a) + ε_oσ(T_o⁴ − T_a⁴)

The public result is capped at up to 96% heat-loss reduction. Above 45 °C outside surface, thickness review is required.

3. Plant conversion

η_bottom = (η_CCGT − η_GT) / (1 − η_GT)

For the same-output case, retained heat becomes fuel avoided. For the more-output case, it becomes additional steam-cycle electricity. They are not added together.

4. Money and carbon

Energy rate and installed cost are blank by default. Payback appears only after both required values are entered. Carbon remains a planning comparison.