Holtec’s Air-Cooled Solution

Holtec’s Air-Cooled Condenser systems (ACCs) feature transformative air-cooling technology that ends reliance on large quantities of cooling water by rejecting waste heat. Featuring space-saving modular components, these proven technologies reduce construction and maintenance costs, and root out operational problems typically present in cyclical, load-following power plants. 

Holtec’s engineers utilize Computational Fluid Dynamics to predict thermal-hydraulic performance, Finite Element Analysis to study fatigue effects, and Dynamic Structural Analysis to define the effects of wind loading and earthquakes on ACCs. These computer models predict the system’s performance under extremely hot and extremely cold ambient conditions with high reliability. 

Design Benefits

Higher steam side carrying capacity for improved performance

Smaller Air-Cooled Condenser plot area saves valuable space

Ability to use stainless or carbon steel tubes for added reliability


Holtec’s HI-MAX (Holtec International MAXimum reliability) features a stainless steel obround tube integrated into a fully modularized structure for ease of erection. Its strength-bonded aluminum fins achieve maximum service life and condensate purity. The thickness, height and spacing of the fins have been optimized using state-of-the art computational fluid dynamics codes to provide maximum fin efficiency for air flow parameters.


HI-KOOL incorporates HI-MAX technology, replacing the stainless steel tubes with carbon steel and self-supporting reproducible modules that can be erected either on or off-site. HI-KOOL incorporates numerous design enhancements that reduce manufacturing and assembly times. 

HI- KOOL Forced Flow: The fan is located below the tube bundle, forcing coolant air to flow through the bundle, which keeps the equipment from being overheated. 

HI-KOOL Induced Draft: The fan sits above the tube bundle, drawing air by induced draft. This is an ideal solution for plants located in low elevation areas.     

Parallel Condensing

Holtec is one of a few companies worldwide that design and supply water cooled and air cooled condensers.  We are in an ideal position to strategically combine both technologies into a single system. Holtec’s Parallel Condensing System is the optimum solution for sites that are challenged by a limited amount of cooling water. By operating the water cooled and air cooled technologies in parallel, Holtec designs a system that optimizes use of the little water available. The benefits of Holtec’s Parallel Condensing System include:

  • Maintaining performance at high ambient conditions.
  • Saving a significant amount of water over an all wet system.
  • Significantly reducing capital cost over an all dry system.
  • Eliminating cooling tower plume in cold weather.


TitleYearPatent No.Statustitle_hfilterdate_hfilterNumber_hfilterStatus_hfilter
A Device for Cooling Fan Motors Used in Induced Draft Air Cooler Condensers202062/986,401Pending
Brazing Compositions and Uses Thereof2019US 10,512,990 B2Granted
Air Induced-Draft Air-Cooled Condenser Amenable to Efficient On-Site Assembly2019Provisional
Structurally Efficient and Installation-Friendly Air-Cooled Condenser201762/564,000Provisional
Finned Tube Assemblies for Heat Exchangers2015US 2015/0027697 A1Published
Fin Tube Assembly for Heat Exchanger and Method2007US 7,293,602 B2Granted