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

Seo-Hoon Kim,Jong-Hun Kim,Jung-Hun Lee,Seung-Hwan Yoo,Hak-Geun Jeong

doi:10.3390/en11071885

Seo-Hoon Kim, Jong-Hun Kim + Show 3 more

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https://doi.org/10.3390/en11071885

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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.

Highlights

Korea has taken measures to reduce energy consumption and greenhouse gas emissions from buildings
The heat flow meter (HFM) and air-surface temperature ratio (ASTR) methods were applied to analyze the thermal performance of the walls and roofs of residential buildings
The accuracy and relative error rate of the in situ measurement method were verified by comparing the results to those of the HFM and

Summary

Introduction

Korea has taken measures to reduce energy consumption and greenhouse gas emissions from buildings. The Korean government has announced amendments including those related to greenhouse gas reduction and strengthening of the insulation of building envelope, to the Energy Saving Design. These amendments are limited to new buildings; the range of energy savings is limited. According to the European Union directive 2012/27/EU [2], existing buildings have the greatest potential for saving energy [3]. It is more necessary to reduce CO2 emissions from existing buildings than from new buildings [4,5]. There is, in particular, a need for measures to improve the energy efficiency of deteriorated houses with high energy losses [6]

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