Abstract
This study proposes the air–surface temperature ratio (ASTR) method as an in situ measurement method to rapidly and accurately measure wall U-values in existing houses. Herein, the wall U-values were measured in situ applying the heat flow meter (HFM) method of ISO 9869-1 and the ASTR method. The results obtained using the HFM and ASTR methods were compared, and the relative error rate and accuracy of the measurements were analyzed. The aging rates of the wall U-values were compared and analyzed by comparing them with the wall U-values before and after the installation of retrofit insulation. Subsequently, the ASTR method was used to analyze the U-value measurement error rates according to the number of measurement days (one day to seven days). In addition, this method calculated the appropriate measurement period required to satisfy the measurement conditions. As a result, the mean relative measurement errors rates of the HFM and ASTR methods were ±3.21%. The short-term (one day) and long-term (seven days or longer) measurement results indicated the average error rates as approximately ±2.63%. These results were included in the tolerance range. Therefore, it was determined that the ASTR method can rapidly and accurately measure wall U-values.
Highlights
The building energy sector in South Korea accounts for 25% of the total energy consumption.Within the building energy sector, housing consumes approximately 18% of the total energy [1].The Korean government is currently implementing various policies for energy conservation and greenhouse gas reduction in the housing sector [2].In the case of existing houses, approximately 50% of the current housing has been in existence for more than 20 years, and energy efficiency has declined
The wall U-values of the existing houses were analyzed using the heat flow meter (HFM) and air–surface temperature ratio (ASTR) methods, and the aging rates of walls exceeding 25 years of age were quantitatively analyzed
The ASTR method was used to analyze the error rates of the wall U-value measurements according to the measurement period
Summary
The building energy sector in South Korea accounts for 25% of the total energy consumption.Within the building energy sector, housing consumes approximately 18% of the total energy [1].The Korean government is currently implementing various policies for energy conservation and greenhouse gas reduction in the housing sector [2].In the case of existing houses, approximately 50% of the current housing has been in existence for more than 20 years, and energy efficiency has declined. The building energy sector in South Korea accounts for 25% of the total energy consumption. Within the building energy sector, housing consumes approximately 18% of the total energy [1]. In the case of existing houses, approximately 50% of the current housing has been in existence for more than 20 years, and energy efficiency has declined. These houses require a means of reducing energy consumption and improving energy efficiency [3]. There are not sufficient in situ diagnosis methods to accurately analyze the energy status of existing houses. The energy efficiency improvements made to the houses decrease; there is a need to further increase the energy efficiency of existing houses
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