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One of the main problems of the molten-salt solar power tower plants is the reliability and lifetime estimation of central-receivers. The receiver must withstand high working temperatures, molten salt corrosion and important solar-flux transient thermal processes that lead to thermal stresses and fatigue. A thermal, mechanical and hydrodynamic analysis of the receiver has been carried out assuming constant temperature at each cell used in the simulations, but assuming axial and circumferential variation temperature in the whole perimeter of the receiver. The optimal design of this kind of receivers has been found varying the number of panels and the external diameter of the tubes. It has been obtained that the maximum film temperature and thermal stress follows a different evolution than the pressure drop, therefore it is necessary to make a compromise between them. The optimal receiver design must reduce the wall and film temperatures and the thermal stresses, assure the correct operation and prolong the lifetime of the receivers. In addition, the chosen design must have the highest thermal efficiency, reducing the number of heliostat and therefore the initial capital investment cost of the solar plant will be lower.

Thermal, mechanical and hydrodynamic analysis to optimize the design of molten salt central receivers of solar tower power plants