In your question you name the research topic. But the title should also represent the work that is done (experimental, numerical, theoretical...). Does it concentrate on the thermodynamic groundwork or on the technical implementation?
Just use a working title, write the thesis and you will know the best title once the work is finished.
The Solar-Powered Net Water Harvester works by using crystalline materials that can harvest water vapor from the air. The harvester uses fine nets to wick water from fog banks, which is then collected and stored for use. It is an example of atmospheric water harvesting, which is becoming increasingly important as freshwater resources become scarcer and more expensive. Other methods of atmospheric water harvesting include the use of desiccants, such as MOF systems, and pressure-retarded membrane distillation. These methods can convert low-grade heat to useful work by harvesting the pressure energy of the water. Overall, atmospheric water harvesting has the potential to provide a sustainable source of drinking water, especially for communities in arid and semi-arid regions.
Atmospheric Water Harvesting: A Review of Material and Structural Designs | ACS Materials Letters
State of the art of rainwater harvesting systems towards promoting green built environments: a review: Desalination and Water Treatment: Vol 57, No 1 (tandfonline.com) Mohammad Ali Allahrabbi Shirazi