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Indoor climate and energy performance in nearly zero energy day care centers and school buildings

Abstract

This study presents the assessment of actual indoor climate condition and energy performance in eight NZEB school and daycare centers of NERO H2020 project. Physical parameters such as indoor temperature, relative humidity, CO2, airflow rate and temperature were measured during heating and cooling seasons, in parallel with an occupants’ questionnaires survey. Besides, calculated and measured energy data was collected from energy performance certificates and energy bills. Thermal comfort and IAQ were assessed based on categories in EN15251 standard with color footprints. Results showed that all the buildings had good or excellent indoor climate during the heating season. However, a large percentage of occupied hours were categorized as category IV during the cooling season, which mainly occurred due to too low indoor temperature caused by the low outdoor temperature during the measurement period. Also, all buildings achieved low CO2 levels. Moreover, the conducted questionaries’ survey showed good correlation with measured results for all buildings except in one building, which had odor and noise problems. In contrast, the measured energy use in 5 buildings out of 7 was increased by factor 2.1-3.0 compared to calculated annual energy use due to a full-time operation of the ventilation system and presence of hot kitchens.
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Category

Academic article

Language

English

Author(s)

  • Kaiser Ahmed
  • Kalle Kuusk
  • Henrik Heininen
  • Endrik Arumägi
  • Targo Kalamees
  • Tero Hasu
  • Nicola Lolli
  • Jarek Kurnitski

Affiliation

  • SINTEF Community / Architecture, Materials and Structures
  • Finland
  • Aalto University
  • Tallinn University of Technology (TalTech University)

Year

2019

Published in

E3S Web of Conferences

Volume

111

View this publication at Norwegian Research Information Repository