![]() ![]() This paper deals with the 2018 experimental campaign of the ALSOLEN 450 prototype. The question, which has to be answered in order to estimate the future perspectives of these two line-focus CST technologies, becomes which of these characteristics carries more weight or how to reach an optimal trade-off between them. For LFR, the development is still in rapid progress to commercial maturity, yet indicating very promising potentials with high flexibility in novel designs and remarkable reduction in capital and operational costs. For PTC, the development is commercially mature with steady and reliable performance therefore, extension of application is the main future demand. It is found that although PTC and LFR are both classified as mainstream line-focus concentrating solar thermal (CST) technologies, they are now standing at different stages of development and facing their individual opportunities and challenges. In the present review, parabolic trough collector (PTC) and linear Fresnel reflector (LFR) are comprehensively and comparatively reviewed in terms of historical background, technological features, recent advancement, economic analysis and application areas. All the works here gathered may serve as a basis for these new studies. However, further studies on this subject must be performed. Even though direct steam generation in solar concentrators is a relatively new concept, it has been properly studied and proved to be a viable operational strategy for both new solar power plants and to generate steam for industrial heating. ![]() The type of work performed by the authors is divided into sections: experimental, one-dimensional models, light water reactor evaluation software, among others. It presents the main considerations and conclusions of each model. This review shows an overview of the main experimental studies performed in the area, alongside models found in the literature. It discuss the direct steam generation operational strategy and advantages, and presents a brief introduction to the two-phase flow phenomena. The present work gathers the main studies in the field of linear solar concentration operating at direct steam generation and gives a comprehensive state of the art.
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