Transient characteristics of a parabolic trough direct-steam-generation process

Lu Li, Jie Sun, Yinshi Li, Ya-Ling He and Haojie Xu

Renewable Energy, 2019, vol. 135, issue C, 800-810

Abstract: Solar-powered direct steam generation (DSG) is attractive for power generation and industrial utilization due to the combination of renewable-energy source and clean energy carrier. An improved SIMPLE algorithm ensuring the dual roles of pressure acting on velocity and density fields is developed to realize thermo-hydraulic completely-coupled modeling of a typical DSG loop with transient phase-change and multiple flow-patterns. The excitation-response characteristics of the loop were investigated under various step-variations of direct normal irradiance (DNI), inlet mass flowrate (min) and inlet temperature (tin). Increasing DNI (decreasing min) is found to narrow the preheating-evaporation regions and expand the superheating region, and vice versa. While under step-variations of tin, the evaporation region almost remains unchanged (about 403 m). The water slides to a lower temperature faster than climbs to a higher one under variations of DNI (up to 670s vs. 2960s) and min (up to 1184s vs. 4420s), simultaneously the outlet temperature (tout) staying a monotonical response-trend. However, under tin variations, tout holds a higher-order trait. The responses of both pressure and velocity are tightly coupled and always hold higher-order trait. The response time of the total mass in the loop is almost 2.5 to 5.5 times as fast as tout.

Keywords: Solar energy; Concentrating solar power (CSP); Direct steam generation (DSG); Transient characteristics; SIMPLE algorithm (search for similar items in EconPapers)
Date: 2019
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Citations: View citations in EconPapers (9)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:135:y:2019:i:c:p:800-810

DOI: 10.1016/j.renene.2018.12.058

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