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    • Indirect dry cooling (Heller System)
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Indirect Dry Cooling (Heller System®)

The cold end of the steam cycle is air-cooled. Intermediate heat transfer circuit filled with condensate quality water and circulated by pumps is applied. Water films formed by the fill of this circuit condenses the exhaust steam in the Direct Contact Jet Condenser attached to the steam turbine. A fraction of the warm circuit water (equal to the condensate stream) is pumped forward to the thermal cycle while most of the warm circuit water is pumped via pipeline to a natural draft cooling tower where it cools down in Forgo-type water-to-air heat exchangers arranged vertically around the towers circumference. Excess pressure head of water leaving the water-to-air heat exchangers is recovered by hydro-turbine installed in common shaft with the pump.

The natural draft-based Heller® System offers a number of inherent advantages, such as lower condenser pressure in winter, flexibility in siting, low noise, low parasitic power consumption and no hot air recirculation. A large tower is able to serve more units, and its enormous lift elevated flue gases (or FGD exhaust) lessening the environmental impact of the plant, if a short chimney (or even the whole scrubber) is placed in the middle.

The system is also available with surface condenser and with mechanical draft tower. The system is environment friendly, saves water equivalent to the consumption of a town of 50,000 inhabitants for each 100 MWe facilitating the licensing of power projects.