Cost-based design optimization of the heat exchangers in a parabolic trough power plant

The economic analysis reveals a global optimum with an outlet temperature of the heat transfer fluid of 293 °C and an evaporator pinch point of 4.85 °C. The best design of the steam generator consists of a TEMA-H shell superheater and preheater and a TEMA-F shell reheater. The best design of the oil-to-salt heat exchangers includes six TEMA-F shell heat exchangers in series, with a log mean temperature difference of 7 °C and the molten salt on the shell-side. Lastly, a TEMA-X recirculation evaporator is proposed with a considerably reduced wall thickness when compared to a kettle evaporator.