Abstract
In the present paper a three-dimensional model of the receiver of a THEK-type parabolic dish is proposed. This model is validated by step change experiments, using infrared thermography. Experimental results and numerical calculations show a good agreement. The three-dimensional model provides calculations of the temperature gradients in the receiver; examples are given for a solar flux step change and a flow rate step change. Such calculations of the thermal operating conditions of the receiver can be very useful for aging studies of the working fluid or of the absorbing coatings and also for mechanical resistance studies of the tubes.
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