Sunday, March 9, 2025

Thermovoltaic systems


Lafarge Exshaw - the largest cement plant in Canada
watercolour and coloured pencil
©2025 Charlene Brown

Thermovoltaics is a technology that converts heat into electricity. Waste heat is everywhere. Globally, of the energy used to power the industries that the world needs such as cement and steel, approximately 60% is simply lost as waste heat. 

Industrial activities account for about one third of total energy consumption and urgently need to cut CO2 emissions.

In 2022, the energy intensity of the cement sector reached 100 kWh per tonne, with fossil fuels as the primary source of thermal energy. Globally, iron and steel manufacturing consumes 8% of total energy demand, contributing to 2.6 billion tonnes (gigatonnes) of CO2 emissions annually. 

Addressing the emissions from these industries and finding ways to capture and productively use the vast amounts of industrial waste heat are critical steps in the fight against climate change.