Assessment of Parameter Adequacy Based on Multi-Day Indoor Temperature Data

Bo-Kyoung Kang; Na-Kyeong Ha; Jung-Hoon Wee; Young-Tae Chae

doi:10.21086/ksles.2026.4.33.2.167

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2026 Vol.33, Issue 2 Preview Page Next Page

Research Article

Assessment of Parameter Adequacy Based on Multi-Day Indoor Temperature Data 다중일자 기반 실내온도 보정에 따른 매개변수 적합성 검토

30 April 2026. pp. 167-175

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Abstract

Building energy consumption continues to rise, increasing interest in digital twin–based calibration for improving operational efficiency. The Nelder–Mead algorithm has been widely applied to building energy models, yet prior studies have focused more on prediction accuracy and computational efficiency than on the physical reliability of calibrated parameters. This study compares multi-day indoor temperature calibration with the conventional single-day approach. A floor of an office building was examined under non-HVAC operating conditions using indoor temperatures measured from 11 sensors. After preprocessing, sensors with high correlation (Pearson > 0.8) were averaged to obtain a representative indoor temperature. Six parameters—U-value, SHGC, infiltration, ventilation, and two cross-mixing rates—were calibrated within extended but plausible boundaries. Single-day calibration yielded the lowest mean CV(RMSE) of 2.42 ± 1.16%, while same-season and cross-season multi-day calibration showed 4.30% ± 2.60% and 3.70% ± 0.60%, respectively. Although multi-day calibration showed slightly higher errors, all cases satisfied the ASHRAE Guideline 14 criterion. Single-day calibration also showed more frequent convergence to boundary values, whereas this tendency was reduced under multi-day calibration, especially in cross-season cases. These results suggest that multi-day calibration can alleviate boundary convergence while keeping calibration errors within the ASHRAE Guideline 14 threshold, although envelope-related parameters still converged to boundary values in some cases.

Keywords

Digital twin

Building energy simulation

Multi-day calibration

Nelder-Mead

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Information

Publisher :The Korean Society of Living Environmental System
Publisher(Ko) :한국생활환경학회
Journal Title :Journal of The Korean Society of Living Environmental System
Journal Title(Ko) :한국생활환경학회
Volume : 33
No :2
Pages :167-175
Received Date : 2026-03-16
Revised Date : 2026-03-31
Accepted Date : 2026-04-08
DOI :https://doi.org/10.21086/ksles.2026.4.33.2.167

Journal of The Korean Society of Living Environmental System ISSN:1226-1289(Print) 한국생활환경학회

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