Indirect Dry Cooling Tower

The worlds largest indirect dry cooling system powering a 4.1 GW power plant in South Africa, is an SPG Dry Cooling system.

Indirect Dry Cooling Tower


About Indirect
Dry Cooling Tower

The indirect dry condensing system couples an indirect dry cooling tower (IDCT) with a steam surface or jet condenser, and is suited for large capacity condensing units. Its tall concrete or steel shell eliminates hot air recirculation. Thanks to the natural draft of cooling air, auxiliary is power minimized, as is the number of mechanical components. This translates into reduced maintenance and high availability.

The mechanical Indirect Dry Cooling Tower is particular type of IDCT where the cooling air flow is not driven by the natural draft from a tall concrete or steel tower , but is induced or forced by fans driven by electrical motors. M-IDCTs are particularly suitable for the Wet to Dry conversion or cooling capacity extension of existing IDCT.

Features of
Indirect Dry
Cooling Tower

An indirect dry condensing system connects a dry cooling tower with a steam condenser. The steam that flows from the turbine is condensed by cold water in a surface condenser or a jet condenser. The heated water is pumped to vertically arranged heat exchangers that are located around the concrete tower. The natural draft cooling tower generates the airflow across the heat exchangers.

IDCT steam cycle
Indirect dry cooling tower SPG DC
Indirect dry cooling tower SPG Dry Cooling
IDCT SPG Dry Cooling



An indirect dry cooling solution reduces auxiliary power and eliminates additional water usage from the condensing power cycle. The large concrete shell prevents hot air recirculation.



Indirect dry cooling systems offer flexibility in power plant site selection. A flue gas desulfurization unit (FGD) can be installed inside the tower.



There is no visible plume or high operational noise coming from the indirect dry cooling tower. It has a stable steam turbine back pressure.


Low maintenance

Indirect dry cooling systems have few rotating parts, which results in a low maintenance.

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Case studies
of Indirect
Dry Cooling

Get to know our clients that have indirect dry cooling systems

Case study: Qinling
Highlighted case
Case study: Qinling
SPG Dry Cooling IDCT Air Cooled Condenser designed and manufactured for QINLING project.
View case

Service & Support


Minimize the risk of downtime and expand asset`s lifespan. Tailored to your needs, SPG Dry Cooling offers a variety of maintenance services. Keeping your dry cooling system performing at optimal levels. Our programs allow you to conduct best practices, maintenance and repairs in an efficient way.

Start your journey with
SPG Dry Cooling

All projects require a different and unique approach. Your first
point of contact with SPG Dry Cooling will be our dedicated and
experienced sales team. You will have a committed team
(project manager, engineering team, quality control officer,
logistics officer) at your disposal through the whole process.
Our team members offer a high quality of customer care and
strive for excellence in service delivery. Please reach out for
more information or a personalized quote.

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Contract Signature

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Kick-off Meeting

With our Project Manager, Engineering team, Quality Control Officer, Logistics officer, as well as with equivalent representatives from the client-side.


Engineering phase

In the first phase, we will hand the client a basic design of the requested product. In the second phase, we will start with a more detailed design.


Procurement phase

With our Project Manager, Engineering team, Quality Control Officer, Logistics officer, as well as with equivalent representatives from the client side. Our Sales Manager will also be there, and often the client’s procurement manager too.

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Fabrication phase


Delivery to client

We can make the equipment and materials available for client pick-up. Or we can deliver goods to the project site.


Erection on site

Erection services can be provided as an option.



Commissioning supervision is provided by one of our experienced technicians.


Warranty period

Discover other products

Looking for a product that offers optimum energy savings and maximal comfort? Select your product and discover a wide range of benefits.

A-frame Air-cooled condensers immediately condense the steam turbine exhaust flow and return condensate to the boiler without water loss. They are frequently used in electrical power plants and waste to energy plants of all sizes.
ModuleAir® is an innovative modular air-cooled condenser (ACC) that directly condenses steam turbine exhaust flow and return condensate to the boiler without any water loss. With construction savings of up to 25%, compared to a standard A-frame, construction time can be reduced by several months for large power plants.
W-Style ACC® is an innovative Induced Draft Air-Cooled Condenser (ACC) directly condensing the steam turbine exhaust flow. The condensate returns to the boiler without any water loss. With its unique “W” heat exchanger structure, the amount of steel and overall height of the ACC are dramatically reduced. This is useful for all power plant applications.
BoxAir ACC® is an innovative Induced Draft Air-Cooled Condenser (ACC), suitable for all power plants ranging from 1 to 30 MWe. This ACC type consists of standard boxes that are easy to assemble and that offer a short delivery schedule and high reliability level. BoxAir ACC® is used in waste incineration plants, biomass, solar and geothermal power plants and is suited as a capacity increase of an existing power plant.
Hexacool® is a standardised, modular air-cooled condenser (ACC) which is easy to build and robust in performance. It is used in waste-to-energy, biomass, small size electrical power plants and industrial co-generation. Hexacool® induced draft configuration saves up to 15% fan power consumption.
Air-Cooled Heat Exchangers (ACHE) are custom designed heavy-duty fin tube heat exchangers. They allow the direct cooling by air of various process mediums. ACHEs are used in applications in many industries, such as power, chemical, ORC plant, Oil & Gas, steel and several other industries.

Get in touch

Questions about
indirect dry cooling

Interested in learning more about indirect dry cooling systems? Share your project request, and we'll get in touch with you very soon!