CO2OLHEAT, a waste heat-to-power initiative funded by EU Horizon 2020, has released further details of the project’s roadmap.

The project aims to recover waste heat which is then converted into electricity via supercritical carbon dioxide (sCO2) power cycles and then fed into a cement plant that delivers 2 MW (megawatts) electrical power. 

The sCO2 power cycle uses CO2 as the working fluid in the turbomachinery. Operated above the critical point of CO2, the process undergoes drastic density changes over small ranges of temperature and pressure. The nature of these power cycles are ideally suited for increased heat-to-electricity conversion efficiencies.

With the project having officially begun last June (2021), the CO2OLHEAT team has concentrated on several areas including its ‘Work Package 1’ (WP2), an assessment of the preliminary cycle for the sCO2 demonstration plant. 

WP2 was led by US energy company Baker Hughes and aimed to address elements of the sCO2 turboexpander, such as its mechanical architecture, the train control philosophy, the dry gas seal configuration and leakages, the preliminary performance curves and the preliminary rotordynamic behaviour of the shaft-line. 


WP3 focused on the sCO2 turbine and was led by Siemens Energy, which submitted its first deliverable. The WP also looked at turbine feasibility design and proper material definition. 

The CO2OLHEAT cycle heat exchangers were the primary focus of WP4. The package elaborated upon deliverable 4.1 – HEXs (heat exchangers) for sCO2 WH2P (Waste heat to power) Plant pre-design. 

A gathering of company partners took place for CO2OLHEAT’s 6-monthly General Assembly on 23rd and 24th November 2021. 

Taking place at the project demonstration site of a CEMEX cement plan in Prachovice, Czech Republic, participants were shown the cement production process. 

The next general assembly is scheduled for May 2022.