Abstract
The temperature field in the absorber tube of a direct steam generating parabolic trough collector is calculated. Steady-state and transient operating conditions are considered. A universal program was developed for solving the two-dimensional transient temperature field using a modular nodal point library. The temperature field is extremely asymmetric due to the variation of the heat transfer coefficient at the inner surface and the solar irradiation at the outer surface of the absorber tube. High temperature peaks are found, especially in stratified flow at higher void fractions. The transient behaviour of the absorber tube has been analysed by stepwise increasing or decreasing the solar irradiation. The response time of the absorber tube is between 70 and 140 s for different void fractions inside.
Published Version
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