On the suitability of test method of GB/T 18708 for water-in-glass evacuated tube solar water heaters

Runsheng Tang; Yuqin Yang; Yamei Yu

doi:10.1109/APPEEC.2012.6307038

On the suitability of test method of GB/T 18708 for water-in-glass evacuated tube solar water heaters

Runsheng Tang
, Yuqin Yang
, Yamei Yu

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

Abstract

The thermal performance of water-in-glass evacuated tube solar water heaters is evaluated based on the daily radiation on the collector surface instead of the daily radiation actually received by a solar tube array, as described by test method of GB/T 18708 (eqv. ISO 9459-2). However, the daily radiation actually received by a solar tube array is quite different from that on the collector surface and strongly dependent on its structural and installing parameters. To assess the suitablity of the said test standard, a sensitivity analysis on the ratio of daily beam radiation actually received by a south-north oriented solar tube array to that by the collector surface, R_b,t-s, was performed based on the radiation predicted under clear sky condition. Results show that R_b,t-s, is strongly dependent on the distance between two adjacent tubes, implying that the testing result of thermal performance based on the test standard of GB/T 18708 is not of comparability for water-in-glass evacuated tube solar water heaters with different tube distance, and a further modification is necessary to essure test results comparable. Results also indicate that R_b,t-s is less sensitive on the tilt and azimuth angles of the collector for the case of |β-λ|≤10° and |φ|≤20°.

Original language	English
Title of host publication	APPEEC 2012 - 2012 Asia-Pacific Power and Energy Engineering Conference, Proceedings
DOIs	https://doi.org/10.1109/APPEEC.2012.6307038
State	Published - 10 Dec 2012
Externally published	Yes
Event	2012 Asia-Pacific Power and Energy Engineering Conference, APPEEC 2012 - Shanghai, China Duration: 27 Mar 2012 → 29 Mar 2012

Publication series

Name	Asia-Pacific Power and Energy Engineering Conference, APPEEC
ISSN (Print)	2157-4839
ISSN (Electronic)	2157-4847

Conference

Conference	2012 Asia-Pacific Power and Energy Engineering Conference, APPEEC 2012
Country/Territory	China
City	Shanghai
Period	27/03/12 → 29/03/12

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

SDG 7 Affordable and Clean Energy
SDG 9 Industry, Innovation, and Infrastructure
SDG 12 Responsible Consumption and Production

Keywords

Daily collectible beam radiation
South-north oriented solar tube array
Test method of GB/T 18708
suitability assessment

ASJC Scopus subject areas

Energy Engineering and Power Technology

Access to Document

10.1109/APPEEC.2012.6307038

Cite this

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title = "On the suitability of test method of GB/T 18708 for water-in-glass evacuated tube solar water heaters",

abstract = "The thermal performance of water-in-glass evacuated tube solar water heaters is evaluated based on the daily radiation on the collector surface instead of the daily radiation actually received by a solar tube array, as described by test method of GB/T 18708 (eqv. ISO 9459-2). However, the daily radiation actually received by a solar tube array is quite different from that on the collector surface and strongly dependent on its structural and installing parameters. To assess the suitablity of the said test standard, a sensitivity analysis on the ratio of daily beam radiation actually received by a south-north oriented solar tube array to that by the collector surface, Rb,t-s, was performed based on the radiation predicted under clear sky condition. Results show that Rb,t-s, is strongly dependent on the distance between two adjacent tubes, implying that the testing result of thermal performance based on the test standard of GB/T 18708 is not of comparability for water-in-glass evacuated tube solar water heaters with different tube distance, and a further modification is necessary to essure test results comparable. Results also indicate that Rb,t-s is less sensitive on the tilt and azimuth angles of the collector for the case of |β-λ|≤10° and |φ|≤20°.",

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author = "Runsheng Tang and Yuqin Yang and Yamei Yu",

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language = "English",

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Tang, R, Yang, Y & Yu, Y 2012, On the suitability of test method of GB/T 18708 for water-in-glass evacuated tube solar water heaters. in APPEEC 2012 - 2012 Asia-Pacific Power and Energy Engineering Conference, Proceedings., 6307038, Asia-Pacific Power and Energy Engineering Conference, APPEEC, 2012 Asia-Pacific Power and Energy Engineering Conference, APPEEC 2012, Shanghai, China, 27/03/12. https://doi.org/10.1109/APPEEC.2012.6307038

On the suitability of test method of GB/T 18708 for water-in-glass evacuated tube solar water heaters. / Tang, Runsheng; Yang, Yuqin; Yu, Yamei.
APPEEC 2012 - 2012 Asia-Pacific Power and Energy Engineering Conference, Proceedings. 2012. 6307038 (Asia-Pacific Power and Energy Engineering Conference, APPEEC).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

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T1 - On the suitability of test method of GB/T 18708 for water-in-glass evacuated tube solar water heaters

AU - Tang, Runsheng

AU - Yang, Yuqin

AU - Yu, Yamei

PY - 2012/12/10

Y1 - 2012/12/10

N2 - The thermal performance of water-in-glass evacuated tube solar water heaters is evaluated based on the daily radiation on the collector surface instead of the daily radiation actually received by a solar tube array, as described by test method of GB/T 18708 (eqv. ISO 9459-2). However, the daily radiation actually received by a solar tube array is quite different from that on the collector surface and strongly dependent on its structural and installing parameters. To assess the suitablity of the said test standard, a sensitivity analysis on the ratio of daily beam radiation actually received by a south-north oriented solar tube array to that by the collector surface, Rb,t-s, was performed based on the radiation predicted under clear sky condition. Results show that Rb,t-s, is strongly dependent on the distance between two adjacent tubes, implying that the testing result of thermal performance based on the test standard of GB/T 18708 is not of comparability for water-in-glass evacuated tube solar water heaters with different tube distance, and a further modification is necessary to essure test results comparable. Results also indicate that Rb,t-s is less sensitive on the tilt and azimuth angles of the collector for the case of |β-λ|≤10° and |φ|≤20°.

AB - The thermal performance of water-in-glass evacuated tube solar water heaters is evaluated based on the daily radiation on the collector surface instead of the daily radiation actually received by a solar tube array, as described by test method of GB/T 18708 (eqv. ISO 9459-2). However, the daily radiation actually received by a solar tube array is quite different from that on the collector surface and strongly dependent on its structural and installing parameters. To assess the suitablity of the said test standard, a sensitivity analysis on the ratio of daily beam radiation actually received by a south-north oriented solar tube array to that by the collector surface, Rb,t-s, was performed based on the radiation predicted under clear sky condition. Results show that Rb,t-s, is strongly dependent on the distance between two adjacent tubes, implying that the testing result of thermal performance based on the test standard of GB/T 18708 is not of comparability for water-in-glass evacuated tube solar water heaters with different tube distance, and a further modification is necessary to essure test results comparable. Results also indicate that Rb,t-s is less sensitive on the tilt and azimuth angles of the collector for the case of |β-λ|≤10° and |φ|≤20°.

KW - Daily collectible beam radiation

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BT - APPEEC 2012 - 2012 Asia-Pacific Power and Energy Engineering Conference, Proceedings

T2 - 2012 Asia-Pacific Power and Energy Engineering Conference, APPEEC 2012

Y2 - 27 March 2012 through 29 March 2012

ER -

On the suitability of test method of GB/T 18708 for water-in-glass evacuated tube solar water heaters

Abstract

Publication series

Conference

UN SDGs

Keywords

ASJC Scopus subject areas

Access to Document

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