Connecting countries to climate technology solutions
English Arabic Chinese (Simplified) French Russian Spanish Yoruba

CO2-Based Heat Pump for Water Purification


The technology is an energy efficient water purification method that can be used for large-scale commercial application. The process works by boiling the contaminated water to destroy the presence of bacterial or parasitic organisms and then instantaneously cooling it. It uses CO2 as the heating agent as well as the refrigerant. In a heat exchanger compressed CO2 is used to boil water to 116 ˇ C destroying any harmful bacteria. The water is then cooled in a radiator by using a fan. The liquid CO2 is throttled to reduce its pressure and subsequently cooled to around 5ˇ C. This cooled CO2 is used as a refrigerant to rapidly reduce the temperature of the water in a second heat exchanger. At the end of the process high purity cold drinking water is obtained which is ready forimmediate consumption. The CO2 is re-heated and compressed to convert it into heating vapor which can be used for a new cycle of water purification.


The process has a number of benefits over existing water purification methods: • Cost-effective in comparison to other methods as the device consumes less power comparable to other household appliances. • Increased efficiency in terms of volume of purified water produced as compared to other domestic water purifying systems. • Eliminates the requirement of a separate refrigerator or cooling process making the output water ready for immediate consumption. • Enhanced mobility of the system is facilitated by its small size and portable nature to be used in areas struck by natural disasters where drinking water is unavailable. • Flexibility to be used areas lacking electricity by the use of alternative fuels like natural gas and biomass by configuring compressors to be connected directly to external heating sources.

Date of release: