The social and political contest sensitize the entire community about the environmental pollution: the actual society lives the fight between advantages of progress and drawbacks due to exploitation of non-reusable resources. During last years lots of industries decide to develop and use different types of ‘emission free’ energy sources, to reduce as much as possible gas emission, especially CO2 ones. Over 65% of the world’s electrical energy is produced by fossil fuels, as gas turbines TG do; all these installations have the same aim: to produce electric power; and are commonly called “heavy-duty”. The aim of this thesis is to evaluate the turbogas cycle of the TG16 machine (an Ethos’ machine) and to design a compact heat exchanger to turn the cycle into a regenerative one.