Industrial Consultancy & Sponsored Research (IC&SR) , IIT Madras

A Modified Surface for Condensation

Technology Category/Market

Category – Surface Modification & Condensation

Applications Improves heat transfer efficiency of heat exchanger coils for heating, air conditioning and used for condensation and water collection for atmospheric water generators.

Industry HVAC (Heating, Ventilation, and Air Conditioning), Renewable Energy, Dehumidifiers, Desalination and Water Treatment

Market – The global surface treatment chemicals market size is valued at 6.5 billion in 2022 and is predicted to reach 12.98 billion in the year 2031 at an 8.9% CAGR during 2023 – 2031.


Problem Statement

  • Heat transfer plays a crucial role in heating and air conditioning industries. Phase change significantly enhances heat transfer due to the large latent heat involved.
  • Researchers have demonstrated that surface engineering at micro- and nano-scales can improve phase change heat transfer across surfaces.
  • The present invention aims to develop a method for creating a modified surface to achieve energy-efficient condensation.
  • The method also seeks to improve sensible heat transfer.
  • The problem is to find an effective and practical approach to enhance heat transfer during condensation processes, benefiting energy applications in heating and cooling systems.


  • The present invention relates to a method of creating a modified surface for condensation by enhancing heat transfer of metallic surfaces by
  • (1) fabricating hierarchical micro-nanostructured surfaces using etching processes, and
  • (2) fabricating hydrophobic and hydrophilic regions, using a printing or a coating technique, followed by etching. (Fig.3 &4)
  • The hierarchical structures comprise of micron-cones of height ranging from 10-20 μm, covered with nanoscale bumps of nearly 500 nm height. (Fig.1)
  • Creating such patterns localizes micro-nanostructures to specific regions enhancing the departure rate of condensed droplets from the surface and improving overall water collection rate.
  • The test setup design was same as the atmospheric water generator design, shown in Fig. 2.

Key Features/Value Proposition

  1. Enhanced Condensation Efficiency
  2. Tailored Hydrophobic-Hydrophilic Patterns
  3. Improved Heat Transfer
  4. Scalability and Cost-Effectiveness
  5. Water Sustainability and Resourcefulness
  6. Energy Efficiency
  7. Environmentally Friendly
Questions about this Technology?

Contact for Licensing

Research Lab

Prof. Pradeep .T

Department of Chemistry

Intellectual Property

  • IITM IDF Ref. 1610
  • IN 201741039127
  • PCT/IN2019/050078 – Published
  • US11536520 – Patent Granted

Technology Readiness Level

TRL – 4

Technology validated in lab.

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