The potential energy savings of heat reuse

Recovering wasted heat can cut fuel consumption, greenhouse gas emissions

By Alaa Kafafi

Energy-intensive industries, such as aluminum, iron and steel, cement, glass, ceramic, chemicals, pulp and paper, oil refining, and food and beverage, consume a great share of energy consumed in the economy. In doing so, their thermal processes reject big quantities of heat energy, and most of this wasted heat is dumped into the atmosphere without beneficial use. Though technologies of waste heat recovery have been in place for decades and are used in oil refining and gas processing applications, the heat reuse process now is being emphasized. The effort focuses on improving energy efficiency in all industries by reducing the consumption of prime energies, a main strategy to combat climate change.


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