การสอบเทียบและปรับปรุงความไวของเครื่องวัดรังสีอาทิตย์ภาคสนามของมหาวิทยาลัยเทคโนโลยีพระจอมเกล้าธนบุรี

Calibration and Sensitivity Improvement of KMUTT's Field Pyranometer

Name: กิตติ ผิวขาว

Organization : มหาวิทยาลัยเทคโนโลยีพระจอมเกล้าธนบุรี

keyword: Solar Radiation Measurement

; Calibration

; Solar Cell

; Pyranometer/Response

; Sensitivity

Abstract: The research is broken down into three parts. First part is studying of three calibration methods for filed pyranometers. They are ISO9847-1992 (or ASTM E824-94) method, Bruce W. Forgan’s method and Sandia National Laboratory’s method. The second part is testing and characterization of silicon photodiode pyranometer model PY03 which was manufactured by Pilot Plant Development and Training Institute (PDTI). Finally, suitable test condition for calibration factor is recommended for Bangkok atmosphere .The study results illustrate that calibration following procedure in ISO9847 has the difference with in 0 - 2 % depending on date and weather of calibration. Bruce W. Forgan’s method should get the calibration factor smaller range than ISO9847 method because the response of total irradiance , diffuse irradiance and directional response are weighed. Sandia National Laboratory’s approach can measure the major effects on responsivity of silicon photovotaic pyranometer and it is the most appropriate method for calibrating and characterizing the pyranometer.Test results of testing PY03’s parameters are as following- Resolution (Wm-2 ) less than 10- Stability (% full scale change per year)-1.3- Cosine response(%deviation from ideal) 0 - 50 degree+ 250 - 70 degree - 1580 degree - 30- Azimuth response +2%- Temperature response + 0.5%- Non-linearity + 1%- Spectral selectivity + 2%- Response time 0.5 ?sMost parameters satisfy the specification of WMO second class pyranometer, exceptfor the cosine response .After the improvement of diffuser, the simulation results of monthly responses varied by 0-2 %. In March PY03 had maximum response and the lowest response was in December. Seasonal response characteristics during 10:00 – 15:00 solar time deviated from mean value about + 1% . The highest response was in cool season. Rainy season has lowest response. In morning and late after noon (before 10:00 and after 15:00 solar time), responsivity deviated +4% of mean value . It was concluded that new sensitivity is better due to the good response of cosineThe appropriate condition of calibration factor of pyranometer in Bangkok should be at Air Mass 1.4, ambient temperature 31 degree Celsius and both direct and diffuse irradiane response have the same weight in the response.

มหาวิทยาลัยเทคโนโลยีพระจอมเกล้าธนบุรี

Address: กรุงเทพมหานคร

Email: info.lib@mail.kmutt.ac.th

Name: พิชัย นามประกาย

Role: อาจารย์ที่ปรึกษา

Created: 2546

Issued: 2005-09-19

Modified: 2554-03-06

วิทยานิพนธ์/Thesis

ISBN: 9741832222

CallNumber: ET578

tha

DegreeName: Master of Engineering

Level: Master's Degree

Descipline: Energy Technology

Grantor: King Mongkut's University of Technology Thonburi

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