Plant and process for recovering waste heat

The combination comprising

• an open gas turbine plant having an exhaust duct for exhausting hot combustion gases;
• a vapor circuit system including a condenser for condensing a flow of working medium, at least one pump for pumping the flow of working medium in said circuit system, a heater for heating the flow of working medium in said circuit system, and an expansion machine for expanding the heated flow of working medium;
• and
• a forced-flow intermediate circuit having a liquid heat vehicle flowing therethrough, said intermediate circuit having a tube with a multiplicity of consecutive passes serially disposed in alternating relation in said exhaust gas duct and said heater to transfer heat from the hot combustion gases to the liquid heat vehicle in said exhaust gas duct and to transfer heat from the liquid heat vehicle to the working medium of said vapor circuit system in said heater, each respective pass extending from one end to an opposite end of said exhaust duct and said heater relative to the flow of hot combustion gases and working medium, each pass being disposed with a net flow direction countercurrent to the respective flows of hot combustion gases and working medium.