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

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

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

2 Citations (Scopus)
123 Downloads (Pure)


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.
Original languageEnglish
Title of host publicationClima 2019
PublisherEDP Sciences
Number of pages9
Publication statusPublished - 13 Aug 2019
MoE publication typeA4 Conference publication
EventREHVA World Congress - Bucharest, Romania
Duration: 26 May 201929 May 2019
Conference number: 13

Publication series

NameE3S web of conferences
PublisherEDP Sciences
ISSN (Print)2555-0403
ISSN (Electronic)2267-1242


ConferenceREHVA World Congress
Abbreviated titleCLIMA


  • Thermal comfort
  • Indoor air quality
  • Questionaries' survey
  • Energy consumption


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