Post-evaluation of the energy retrofit process in three public schools in Denmark

Muhyiddine Jradi*

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

Abstract

Considering that over 80% of buildings in Denmark were built before the 1980's, a holistic energy retrofitting of the existing building stock is a major milestone to attain the energy and environmental targets of the country. In this work, a case study of three public schools is considered for post-retrofit process evaluation. The three schools were heavily retrofitted by September 2018 with energy conservation and improvement measures implemented targeting both, the building envelope and various energy systems. A technical evaluation of the energy retrofit process in the schools was carried out, considering one year of operation after the completion of the retrofitting work. Actual data from the heating and electricity meters in the schools was collected and compared with the pre-retrofit design numbers which rely majorly on static tabulated numbers for savings evaluation. It was shown that the retrofit design numbers largely overestimate the attained savings, where the average performance gap between the expected and the real numbers for the three schools is around 61% and 136% for annual heating and electricity savings respectively. On the other hand, an alternative approach was proposed where calibrated dynamic energy performance models, developed for the three schools in EnergyPlus, were used to simulate the impact of implementing the retrofit measures. It was shown that implementing this approach could predict much better the impacts of the retrofit process with an average gap of around 17% for heating savings and 21% for electricity savings. Based on the post-retrofit process evaluation in the three schools, it was concluded that using dynamic model simulations has the potential of lowering the performance gap between the promised and the real savings compared to static tabulated approaches, although the savings are still generally over-estimated in both approaches.

Original languageEnglish
Title of host publication33rd International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems (ECOS 2020)
EditorsRyohei Yokoyama, Yoshiharu Amano
PublisherECOS
Publication date2020
Pages2036-2047
ISBN (Print)9781713814061
Publication statusPublished - 2020
Event33rd International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems, ECOS 2020 - Osaka, Japan
Duration: 29. Jun 20203. Jul 2020

Conference

Conference33rd International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems, ECOS 2020
Country/TerritoryJapan
CityOsaka
Period29/06/202003/07/2020
SponsorAzbil Corporation, Kansai Electric Power Co., Inc., Mitsubishi Heavy Industries Thermal Systems, Ltd., Yanmar Holdings Co., Ltd.

Keywords

  • Dynamic post-evaluation
  • Energy retrofit
  • EnergyPlus
  • Performance gap
  • Public schools

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