Panyaden International School has recently innovated a cool and purified air system through sustainable environmental engineering, the first of its kind in Asia and Thailand. 

The Panyaden Fresh Air System was successfully installed and tested in the school’s secondary campus buildings to purify the indoor air quality, bringing the value below AQI 10 even outside AQI is above 190. The results also showed that the Fresh Air System provided a constant supply of fresh air, as the CO2 index inside the rooms remained much lower compared to standard air conditioned rooms.

The Panyaden Fresh Air System was initiated to tackle the pollution and health risks arising from the smoke season in Northern Thailand and provide a zero haze and PM2.5 (polluting particles in the atmosphere) free indoor environment to its students. This innovative air system aims to supply cool, fresh and clean air inside the rooms while reducing overall energy consumption. It is a more sustainable and environmentally friendly energy alternative to standard air conditioners and air purifiers. Panyaden would be the first school in Asia to use this innovative Fresh Air System.

How the Panyaden Fresh Air System works

The Panyaden Fresh Air System saves energy by using a thermal exchange process, which utilizes the cooler temperature of air underground. In simple terms, it works as follows:

  1. Outside air with ambient temperature is pumped into an underground pipe system using a powerful fan.
  2. The air then is cleaned through an active charcoal hepa filter which removes germs, smell and PM2.5 from the air.
  3. The air is pre-cooled using an earth cooling system consisting of 10 fifteen meter long pipes underground, then filtered again before supplying to the classroom. The volume of the air required to provide enough cool, fresh and clean air inside the classroom is calculated based on the thermal difference between the classroom and the earth cooling system, and the total number of people in the building.   
  4. The fresh-air-supply creates a positive pressure (5 pascal) in the rooms, reducing CO2 and PM2.5 levels, and thus increasing oxygen supply in the rooms.
  5. The classroom buildings use a VRF (Variable Refrigerant Flow) to maintain a good cold air distribution in the rooms, which is the best air conditioning system available in the current market.

The benefits of the Panyaden Fresh Air System

The are several benefits to using the Panyaden Fresh Air System instead of the standard air conditioners and air purifiers:

  • Cooler air inside the classroom during hot seasons. The indoor temperature remains at a comfortable level of 27-28 degree celsius.
  • Cleaner air inside the classroom, with a much lower rate in CO2 and PM2.5. This means there is more oxygen supply and less polluting particles in the atmosphere, which can boost the performance of the students. 1 2
  • 30% less energy consumption compared to standard air conditioners, thus providing a more environmentally friendly solution. 
  • The Panyaden Fresh Air System will be a Learning Center, the first of its kind in Asia, for Panyaden students and the public to learn how to use environmental science to innovate sustainable engineering systems.  

Panyaden International schools aims to install this innovative system in all classrooms in the whole campus in the next two academic years. We would like to acknowledge the contribution of Chiangmai Life Construction team, Mr. Markus Roselieb, Mr. Markus Giefing , CATEC (Chiangmai Airtech Engineering), Mr Somsak Auttapracha and his team for their tireless efforts in innovating the Panyaden Fresh Air System. We would also like to express our special gratitude and appreciation to Erber Family Foundation (Thailand) for sponsoring this scientific innovation. 


1 Orlando, A. (2020, January 14). Putting Air Filters in Classrooms Could Give Student Performance a Serious Boost. Discover Magazine. https://www.discovermagazine.com/environment/putting-air-filters-in-classrooms-could-give-student-performance-a-serious

2 White Paper: Fraunhofer-Institut für Bauphysik IBP. (2015). Impact of the indoor environment on learning in schools in Europe. https://velcdn.azureedge.net/~/media/com/articles/pdf/fraunhoffer%20infographics.pdf