Performance Comparison of Different Models of Direct Steam Solar Plants Based on Parabolic Trough Technology by Simulink MATLABSanan T. Mohammad, Hussain H. Al-Kayiem, Syed I.U. Gilani and Ayad K. KhliefMATEC Web Conf., 225 (2018) 02007DOI: https://doi.org/10.1051/matecconf/201822502007