The use of a parabolic collector trough (PTC) array to supply the heat requirement of a phosphate flash dryer is investigated. To evaluate the thermal performances of a PTC array operating between 200 and 550 degrees C, new heat transfer models were developed. These models, considering either a uniform or a non-uniform distribution of the solar flux, were adapted from basic models by including more accurate correlations while considering longitudinal variations of the convective term. Simulations of the FTC array were conducted for various solar loops, using different heat transfer fluids (HTF). Simulated results from both models are in good agreement with experimental data, with the uniform model predicting HTF outlet temperature at a maximum uncertainty of 0.3 degrees C. This value jumps to 1.7 degrees C when gas is used as HTF or when the solar loop exceeds 700 m in length. From a Fisher test standpoint, these results can be considered as comparable to those obtained from more complicated models. Using these new models, the output of a PTC prototype was estimated and served as the basis to predict the yield of a coupled bench scale flash dryer unit. (C) 2018 Elsevier Ltd. All rights reserved.