Prediction of the Impact of Air Speed Produced by a Mechanical Fan and Operative Temperature on the Thermal Sensation
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 v...
| Autores: | , , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2022 |
| País: | España |
| Institución: | Consejo General de la Arquitectura Técnica de España (CGATE) |
| Repositorio: | RIARTE |
| OAI Identifier: | oai:www.riarte.es:20.500.12251/2835 |
| Acceso en línea: | http://hdl.handle.net/20.500.12251/2835 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85123245156&doi=10.3390%2fbuildings12020101&partnerID=40&md5=296813915a4ba8d4380ce3985bec6a94 |
| Access Level: | acceso abierto |
| Palabra clave: | Ventilación natural Confort térmico Ventilación mecánica Simulación energética - herramientas Sensorización Climas extremos Ensayos (propiedades o materiales) Edificación residencial 3305.14 Viviendas 3313.01 Ventiladores 6310.09 Calidad de Vida 3311.02 Ingeniería de Control 3311.16 Instrumentos de Medida de la Temperatura |
| Sumario: | 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 effective-ness 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. © 2022 by the authors. Licensee MDPI, Basel, Switzerland. |
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