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Article

Prediction of the Impact of Air Speed Produced by a Mechanical Fan and Operative Temperature on the Thermal Sensation

1
Faculdade de Arquitetura e Urbanismo, Universidade de São Paulo, São Paulo 05508-080, Brazil
2
Faculdade de Arquitetura e Urbanismo, Centro Universitário Belas Artes, São Paulo 04011-062, Brazil
3
Escuela Técnica Superior de Edificación, Universidad Politécnica de Madrid, 28040 Madrid, Spain
*
Author to whom correspondence should be addressed.
Academic Editors: Francesco Leccese and Giacomo Salvadori
Buildings 2022, 12(2), 101; https://doi.org/10.3390/buildings12020101
Received: 4 December 2021 / Revised: 13 January 2022 / Accepted: 17 January 2022 / Published: 21 January 2022
Natural ventilation associated with a mechanical fan is a feasible strategy to enhance thermal acceptability in warm weather. The ASHRAE-55 provides the increase for operative temperature proportional to the increase in air speed while maintaining thermal comfort. Conversely, the range of informed values is limited and little guidance for mechanical fans is provided. This work explores the relationship between operative temperature and air speed produced by ceiling fans, and the effectiveness to deliver thermal comfort for a wider range of values. The research method comprises transient computer fluid dynamics simulations coupled with a thermal sensation model and is divided into two stages: a calibration exercise and a parametrical investigation. Three matrices are presented for a range of operative temperatures (21.0–36.0 °C) and air speeds (0–2.5 m/s) for: Dynamic Thermal Sensation (DTS) (a computer-based seven-point index), Predicted Percentage of Dissatisfied, and potential Cooling Effect. When compared to the Predicted Mean Vote, the DTS overestimates thermal comfort for temperatures under 28.0 °C with increased air speed and overestimates discomfort for temperatures above 31.0 °C, even with increased air speed. Agreement is found between both scales for 28.0–31.0 °C, defining a range for the effective use of ceiling fans to provide thermal comfort under warm weather conditions. View Full-Text
Keywords: thermal sensation; operative temperature; air speed; ceiling fan; CFD thermal sensation; operative temperature; air speed; ceiling fan; CFD
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MDPI and ACS Style

Faria, L.C.d.; Romero, M.d.A.; Porras-Amores, C.; Pirró, L.F.d.S.; Saez, P.V. Prediction of the Impact of Air Speed Produced by a Mechanical Fan and Operative Temperature on the Thermal Sensation. Buildings 2022, 12, 101. https://doi.org/10.3390/buildings12020101

AMA Style

Faria LCd, Romero MdA, Porras-Amores C, Pirró LFdS, Saez PV. Prediction of the Impact of Air Speed Produced by a Mechanical Fan and Operative Temperature on the Thermal Sensation. Buildings. 2022; 12(2):101. https://doi.org/10.3390/buildings12020101

Chicago/Turabian Style

Faria, Luciano C.d., Marcelo d.A. Romero, César Porras-Amores, Lucia F.d.S. Pirró, and Paola V. Saez. 2022. "Prediction of the Impact of Air Speed Produced by a Mechanical Fan and Operative Temperature on the Thermal Sensation" Buildings 12, no. 2: 101. https://doi.org/10.3390/buildings12020101

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