Experimental and theoretical analysis of annular two-phase flow regimen in direct steam generation for a low-power system

Solar Energy ◽  
2007 ◽  
Vol 81 (2) ◽  
pp. 216-226 ◽  
Author(s):  
Iván Martínez ◽  
Rafael Almanza
Keyword(s):  
Theoretical Analysis ◽  
Power System ◽  
Low Power ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Steam Generation ◽  
Two Phase ◽  
Low Power System ◽  
Direct Steam

Comparison of Two-Phase Flow Correlations for Thermo-Hydraulic Modeling of Direct Steam Generation in a Solar Parabolic Trough Collector System

2018 ◽  
Vol 10 (4) ◽  
Author(s):  
Bohra Nitin Kumar ◽  
K. S. Reddy
Keyword(s):  
Heat Transfer ◽  
Pressure Drop ◽  
Two Phase Flow ◽  
Hydraulic Modeling ◽  
Test Facility ◽  
Phase Flow ◽  
Steam Generation ◽  
Two Phase ◽  
Direct Steam ◽  
Flow Map

Direct steam generation (DSG) in parabolic trough collector (PTC) is an efficient and feasible option for solar thermal power generation as well as for industrial process heat supply. The two-phase flow inside the absorber tube complicates the thermo-hydraulic modeling of the DSG process. In the present work, a thermo-hydraulic model is developed for the DSG process in the receiver of a solar PTC. The two-phase flow in the evaporating section is analyzed using two empirical correlations of heat transfer and pressure drop, and a flow map integrated heat transfer and pressure drop model. The results of the thermo-hydraulic simulation using different two-phase heat transfer and pressure drop correlations were compared with experimental data from the direct solar steam (DISS) test facility at Plataforma Solar de Almeria (PSA), Spain. The test facility has collectors with aperture width of 5.76 m, focal length of 1.71 m, and absorber tube with inner and outer diameters of 50 mm and 70 mm, respectively. The simulation results using the aforementioned two-phase models were found to be satisfactory and consistent within the experimental uncertainty. The flow map based heat transfer model predicted the mean fluid temperature with root-mean-square error (RMSE) of 0.45% and 1.40%, for the cases considered in the present study. Whereas the flow pattern map based pressure drop model predicts the variation of pressure along the length of the collector with RMSE of 0.5% and 0.14%. Moreover, the flow pattern map based model predicts the different flow regimes paving a better understanding of the two-phase flow and helps in identifying the critical sections along the collector length.

scholarly journals Numerical simulation of evaporating two-phase flow: application to concentrated solar plants with direct steam generation

2014 ◽  
Vol 18 ◽  
pp. 03003
Author(s):  
Rémi Dinsenmeyer ◽  
Jean-François Fourmigué ◽  
Nadia Caney ◽  
Philippe Marty
Keyword(s):  
Numerical Simulation ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Steam Generation ◽  
Two Phase ◽  
Direct Steam

Efficiency of a Combined Desalination and Power System Utilizing a Two-Phase Flow Multistream Heat Exchanger

2016 ◽  
Vol 38 (11-12) ◽  
pp. 1000-1007 ◽  
Author(s):  
Alireza Hosseini Araghi ◽  
Mehdi Khiadani ◽  
Kamel Hooman ◽  
Gordon Lucas
Keyword(s):  
Heat Exchanger ◽  
Power System ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Two Phase

Direct Steam Generation in Parabolic Troughs: First Results of the DISS Project

2002 ◽  
Vol 124 (2) ◽  
pp. 134-139 ◽  
Author(s):  
M. Eck ◽  
W.-D. Steinmann
Keyword(s):  
Steady State ◽  
Controller Design ◽  
Experimental Results ◽  
Phase Flow ◽  
Simulation Studies ◽  
Steam Generation ◽  
Two Phase ◽  
State Tests ◽  
Direct Steam ◽  
First Results

This article presents the latest experimental results of the European DISS (DIrect Solar Steam) project. The experiments are subdivided into steady state and transient tests. The goal of the steady state tests is the investigation of the thermohydraulic phenomena of the occurring two phase flow, whereas the transient tests are needed for the controller design. The experimental results are compared to simulation studies. Implications for the plant operation will be discussed.

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