Paper Information

Title: 

PERFORMANCE STUDY OF HELIOSTAT FIELD IN A CENTRAL RECEIVER SOLAR POWER PLANT

Type: PAPER
Author(s): MEHRABIAN M.A.,DADKHAH R.
 
 
 
Name of Seminar: INTERNATIONAL POWER SYSTEM CONFRENCE
Type of Seminar:  CONFERENCE
Sponsor:  SHERKATE TAVANIR
Date:  2004Volume 19
 
 
Abstract: 

CENTRAL RECEIVER SOLAR POWER PLANTS ARE OF THE MOST IMPORTANT THERMAL SOLAR POWER PLANTS. THEY HAVE BEEN THE FOCUS OF INTEREST BECAUSE OF HIGH TEMPERATURES AND REASONABLE THERMAL EFFICIENCIES. IN THIS POWER PLANT A LARGE NUMBER OF INDIVIDUALLY STIRRED MIRRORS (HELIOSTATS), FOCUS THE SOLAR RADIATION ONTO A TOWER-MOUNTED RECEIVER. IN ORDER TO CONTROL THE HELIOSTATS IT IS REQUIRED TO CALCULATE THE VARIATIONS OF CHARACTERISTIC ANGLES OF EACH HELIOSTAT DURING THE YEAR AND DAY. KNOWING THE CHARACTERISTIC ANGLES, IT IS ALSO POSSIBLE TO STUDY THE EFFECT OF IMPORTANT PARAMETERS ON THE OPTICAL PERFORMANCE OF THE FIELD. THE HELIOSTAT FIELD IS THE MOST EXPENSIVE PART OF THE POWER PLANT AND THEREFORE ITS OPTIMUM DESIGN CAN REDUCE THE CAPITAL COST OF THE POWER PLANT. IN THIS PAPER AN ALGORITHM IS DEVELOPED BASED ON VECTOR GEOMETRY TO CALCULATE THE CHARACTERISTIC ANGLES OF HELIOSTATS AS A FUNCTION OF TIME AND POSITION (WITH RESPECT TO RECEIVER). THIS PROCEDURE BEING RELATIVELY SAMPLE, IS QUITE SUITABLE FOR COMPUTER PROGRAMMING. THE EFFECT OF MAJOR PARAMETERS SUCH AS SHADING AND BLOCKING ON THE PERFORMANCE OF THE HELIOSTAT FIELD CAN ALSO BE STUDIED USING THE ALGORITHM. THE RESULTS OF COMPUTER SIMULATION ARE PRESENTED AS DIAGRAMS. AS AN EXAMPLE THE RESULTS SHOW THAT THE EFFECT OF BLOCKING IS MUCH MORE IMPORTANT THAN SHADING FOR THE LARGE FIELD. THE MAIN RESULT ACHIEVED IN THIS RESEARCH IS A PROGRAM FOR OPEN LOOP CONTROL OF THE INDIVIDUAL HELIOSTATS.

 
Keyword(s): CENTRAL RECEIVER SOLAR POWER PLANT, HELIOSTAT-INCIDENCE ANGLE, SHADING, BLOCKING
 
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