The Wet-TSA DAC captures CO2 from the air using a rotor. When applied to air conditioning and ventilation, utilizing the exhaust air allows for effective CO2 capture, as the exhaust already contains approximately three times the CO2 concentration of the outside air due to human respiration. Furthermore, the air from which CO2 has been removed has a CO2 concentration similar to the outside air. Therefore, in areas with exceptionally high outside temperatures or poor air quality, removing and purifying CO2 from exhaust or outside air before reuse improves comfort and energy efficiency.

Outside CO2 concentrations are particularly high in large metropolitan areas. Data shows that the average CO2 concentrations in major Indian cities are:

* Delhi: 900-1200 ppm

* Mumbai: 800-1000 ppm

* Bangalore: 750-900 ppm

While global warming caused by CO2 emissions is a major concern, a shortage of liquefied CO2 (LCO2) is becoming increasingly apparent worldwide.

Demand for LCO2 is rapidly increasing not only for industrial applications but also due to the rise in carbonated beverages, food preservation, frozen food use, and medical applications.

LCO2 was previously recovered and utilized as a by-product from petroleum refining facilities. However, the widespread adoption of energy-saving measures such as solar panels and home battery storage systems, as well as the proliferation of hybrid and electric vehicles (EVs), has reduced petroleum demand. Furthermore, the decrease in production of petroleum-related products due to plastic recycling is also contributing to the LCO2 shortage.

From the perspective of combating global warming, the increased CO2 emissions from transporting LCO2 gas from industrial petroleum refining facilities to demand centers in heavy, high-pressure containers are also a problem.

In addition, even if CO2 derived from fossil fuels is recovered and utilized, it is ultimately released into the atmosphere, accelerating global warming.

This patented Wet-TSA airborne CO2 recovery and concentration system is an energy-saving liquefied CO2 production system that compresses, cools, and liquefies recovered high-concentration CO2 gas. By combining it with a dry ice production device, it can also produce dry ice.

Demand for dry ice is expected to increase in the future. It is necessary for the widespread use of frozen foods and the associated transportation. Dry ice will also be needed for small-lot deliveries of frozen and refrigerated goods by drones, which are expected to become more widespread in the future. Since green dry ice uses CO2 recovered from air conditioning exhaust in urban areas, it will not worsen the CO2 concentration in urban areas.

The dry ice production system, which uses air conditioning air as a CO2 source, can be installed even on remote islands. If locally produced and consumed dry ice can be produced, it may revolutionize the distribution of local products, such as those on remote islands where expanding sales has been difficult until now.

Since the dry ice production system generates and utilizes green liquefied CO2 recovered from the air, it is also possible to supply liquefied CO2. If technology is developed to convert CO2 into fuel or valuable materials, it will be possible for factories to introduce this system and procure CO2 within their own facilities. This would then make carbon credit certification a reality.

In addition to the Wet-TSA carbon dioxide capture and concentrator, dry ice production systems that use air as a carbon dioxide source have many features to further improve the energy efficiency and capture efficiency of the entire system.

1. Exhaust heat generated within the system and exhaust heat from district cooling are used as the heat source to drive the carbon dioxide capture and concentrator.

2. When the captured CO2 gas is liquefied, CO2 gas containing air mixed in as an impurity is produced, but this gas is reused to improve the performance and efficiency of the carbon dioxide concentration capture and concentrator.

By recovering and utilizing the waste heat and exhaust gas from the CO2 compression, cooling, and liquefaction equipment, the Wet-TSA DAC will also become more energy-efficient and higher performance.