{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,27]],"date-time":"2026-01-27T11:29:52Z","timestamp":1769513392361,"version":"3.49.0"},"reference-count":77,"publisher":"MDPI AG","issue":"4","license":[{"start":{"date-parts":[[2021,2,7]],"date-time":"2021-02-07T00:00:00Z","timestamp":1612656000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Energies"],"abstract":"<jats:p>In this study, a grey box (GB) model for simulating internal air temperatures in a naturally ventilated nearly zero energy building (nZEB) was developed and calibrated, using multiple data configurations for model parameter selection and an automatic calibration algorithm. The GB model was compared to a white box (WB) model for the same application using identical calibration and validation datasets. Calibrating the GB model using only one week of data produced very accurate results for the calibration periods but led to inconsistent and typically inaccurate results for the validation periods (root mean squared error (RMSE) in validation periods was 229% larger than the RMSE in calibration periods). Using three weeks of data from varying seasons for calibration reduced the model accuracy in the calibration period but substantially increased the model accuracy and generalisation abilities for the validation period, reducing the mean RMSE by over 160%. The use of one week of data increased the standard deviation in parameter selections by over 40% when compared with the three-week calibration datasets. Utilising data from multiple seasons for calibration purposes was found to substantially improve generalisation abilities. When compared to the WB model, the GB model produced slightly less accurate results (mean RMSE of the GB model was 1.5% higher). However, the authors found that employing GB modelling with an automatic model calibration technique reduced the human labour input for simulating internal air temperature of a naturally ventilated nZEB by approximately 90%, relative to WB modelling using a manually calibrated approach.<\/jats:p>","DOI":"10.3390\/en14040871","type":"journal-article","created":{"date-parts":[[2021,2,8]],"date-time":"2021-02-08T20:51:51Z","timestamp":1612817511000},"page":"871","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":23,"title":["Development, Calibration and Validation of an Internal Air Temperature Model for a Naturally Ventilated Nearly Zero Energy Building: Comparison of Model Types and Calibration Methods"],"prefix":"10.3390","volume":"14","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-4269-2581","authenticated-orcid":false,"given":"Michael D.","family":"Murphy","sequence":"first","affiliation":[{"name":"Department of Process, Energy and Transport Engineering, Munster Technological University, Rossa Avenue, Bishopstown, T12 P928 Cork, Ireland"}]},{"given":"Paul D.","family":"O\u2019Sullivan","sequence":"additional","affiliation":[{"name":"Department of Process, Energy and Transport Engineering, Munster Technological University, Rossa Avenue, Bishopstown, T12 P928 Cork, Ireland"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8643-1180","authenticated-orcid":false,"given":"Guilherme","family":"Carrilho da Gra\u00e7a","sequence":"additional","affiliation":[{"name":"Dom Luiz Institute, Faculty of Sciences, University of Lisbon, Campo Grande, 1749-016 Lisbon, Portugal"}]},{"given":"Adam","family":"O\u2019Donovan","sequence":"additional","affiliation":[{"name":"Department of Process, Energy and Transport Engineering, Munster Technological University, Rossa Avenue, Bishopstown, T12 P928 Cork, Ireland"}]}],"member":"1968","published-online":{"date-parts":[[2021,2,7]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"309","DOI":"10.1016\/j.apenergy.2016.02.036","article-title":"Estimating hourly cooling load in commercial buildings using a thermal network model and electricity submetering data","volume":"169","author":"Ji","year":"2016","journal-title":"Appl. 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