Effect of short cloud shading on the performance of parabolic trough solar power plants: motorized vs manual valves
Authored by Jesus M Garcia, Ricardo Vasquez Padilla, Mohammad Abutayeh, Maree Lake, Yee Yan Lim, Mohammadreza Sedighi, Yen Chean Soo Too, Kwangkook Jeong
Date Published: 2019
DOI: 10.1016/j.renene.2019.04.094
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Abstract
This paper uses a dynamic bio-inspired model to simulate cloud movement
over a parabolic trough collector solar field. Time-stamped spatially
varying solar radiation records resulting from that dynamic model are
successively fed into an instantaneous flow distribution model of the
same solar field. Two different flow control strategies are simulated to
evaluate and compare their impact on plant performance. One strategy
employs manual balancing valves resulting in an uneven exit temperature
from each loop during cloud cover periods. The other strategy employs
motorized balancing valves that constantly adjust to achieve a common
desired exit temperature from each loop during cloud cover periods.
Model output of both strategies under four different cloud shading
conditions are compared. Simulation results showed that employing
motorized balancing valves will result in a more efficient operation
involving less pressure drop, higher outlet temperature and less pumping
load; however, the rate of power generation was almost the same in both
strategies. (C) 2019 Elsevier Ltd. All rights reserved.
Tags
Agent-based model
Cloud shading
Concentrating solar power
Parabolic trough
collectors
Heat transfer fluid
Flow balance