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Energies 2018, 11(7), 1885; https://doi.org/10.3390/en11071885

The Feasibility of Improving the Accuracy of In Situ Measurements in the Air-Surface Temperature Ratio Method

1
Energy ICT∙ESS Laboratory, Korea Institute of Energy Research, Daejeon 34101, Korea
2
Department of Architectural Engineering, Hanyang University, Seoul 04763, Korea
3
Department of Architectural Engineering, Sungkyunkwan University, Suwon 16419, Korea
*
Author to whom correspondence should be addressed.
Received: 15 June 2018 / Revised: 10 July 2018 / Accepted: 16 July 2018 / Published: 19 July 2018
(This article belongs to the Special Issue Building Energy Use: Modeling and Analysis)
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Abstract

This paper reports on a feasibility study conducted to improve the in situ measurement accuracy of the air-surface temperature ratio (ASTR) method. The measured relative error rate was analyzed using the ISO 6946 [7.69 W/(m2·K)] and Korea Energy Saving Design Standard [9.09 W/(m2·K)] indoor total surface heat transfer coefficients. The relative error rate was analyzed according to fluctuations in outdoor temperature data. The relative error rate obtained using the ISO 6946 standard was analyzed about 6.3% and that obtained using the Korea Energy Saving Design Standard was about 9.5%. The relative error rate measured for outdoor temperature fluctuations of less than 1 K was about 4.62% and that for temperatures greater than 1 K was about 14.31%. The study results confirmed the cause of the error in the measurement of the ASTR. It was also found that the accuracy of the latter can be improved when the ISO 6946 indoor total surface heat transfer coefficient is applied and when outdoor temperature fluctuations less than 1 K are sampled and analyzed. View Full-Text
Keywords: air-surface temperature ratio; indoor total surface heat transfer coefficient; in situ measurement of U-value air-surface temperature ratio; indoor total surface heat transfer coefficient; in situ measurement of U-value
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Kim, S.-H.; Lee, J.-H.; Kim, J.-H.; Yoo, S.-H.; Jeong, H.-G. The Feasibility of Improving the Accuracy of In Situ Measurements in the Air-Surface Temperature Ratio Method. Energies 2018, 11, 1885.

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