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Evaluation of a new photodiode sensor for measuring global and diffuse irradiance, and sunshine duration.

Wood, John, Muneer, Tariq and Kubie, Jorge (2007) Evaluation of a new photodiode sensor for measuring global and diffuse irradiance, and sunshine duration. ASME Journal of Solar Energy Engineering, 125 (1). pp. 1-6. ISSN 0199 6231

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Abstract/Description

A new integrated device (called the BF3) has been developed, which enables the simultaneous measurement of horizontal global and diffuse irradiance as well as sunshine presence at any time. The sensor needs no specific polar alignment or routine adjustment, and works at any latitude. To evaluate the performance of this new device, a BF3 sensor was installed on the roof of a six-story building in the Merchiston Campus of Napier University, Edinburgh from February 22–July 3, 2001. Horizontal global and diffuse irradiance data were collected from the BF3. To enable a cross check, two Kipp and Zonen CM11 sensors, one with a shade ring, have also been installed beside the BF3 sensor on the same roof. These were used to give a reference measure of the horizontal global and diffuse irradiance. To evaluate the BF3 sunshine duration performance, the direct beam normal irradiance was calculated from the CM11 global and diffuse readings, and compared with a threshold of 120 W.m–2 to give sunshine presence according to the WMO definition. This was compared against the BF3 output, and also with data from two Campbell-Stokes sunshine recorders on the same site. The results show a stable performance on the part of the BF3 sensor for the measurement of horizontal global and diffuse irradiance. The global irradiance measured by the BF3 showed values 4.7% high, with a standard error of 16.5 W.m–2 compared to the Kipp and Zonen sensors. Diffuse values were 1.4% high with a standard error of 13.4 W.m–2. The BF3 sunshine duration was within 2% of that calculated from the WMO definition over the study period, with a typical daily error of less than 20 min. This is well within the WMO requirements for a sunshine recorder. In comparison, the Campbell-Stokes recorders gave readings up to 7% different from the WMO values, with a typical daily error of almost an hour.

Item Type: Article
Print ISSN: 0199 6231
Electronic ISSN: 1528 8986
Uncontrolled Keywords: Solar energy; Measurement; Photodiode sensor; Horizontal global irradiance; Diffuse irradiance; Sunshine time; Evaluation; Comparison; Standard instruments; Performance;
University Divisions/Research Centres: Faculty of Engineering, Computing and Creative Industries > School of Engineering and the Built Environment
Dewey Decimal Subjects: 600 Technology > 620 Engineering > 621 Electronic & mechanical engineering
500 Science > 510 Mathematics > 510 Mathematics
Library of Congress Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering
Q Science > QA Mathematics
Item ID: 1873
Depositing User: RAE Import
Date Deposited: 27 May 2008 16:56
Last Modified: 18 Feb 2013 16:13
URI: http://researchrepository.napier.ac.uk/id/eprint/1873

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