Thermal comfort guidelines for production spaces within multi-storey garment factories located in Bangladesh

Hossain, M.M., Wilson, R., Lau, B. and Ford, B. 2019. Thermal comfort guidelines for production spaces within multi-storey garment factories located in Bangladesh. Building and Environment. 157, pp. 319-345. doi:10.1016/j.buildenv.2019.04.048

TitleThermal comfort guidelines for production spaces within multi-storey garment factories located in Bangladesh
TypeJournal article
AuthorsHossain, M.M., Wilson, R., Lau, B. and Ford, B.
Abstract

This research presents extensive field data on indoor thermal conditions along with workers' comfort votes taken at their workstations within three existing multi-storied garment factories during the three seasons (cool-dry, hot-dry and warm-humid) of Bangladesh. The main objective of the study was to observe the impact of thermal conditions on workers’ indoor thermal perception during each season of a year and from this identify thermal comfort guidelines (e.g. neutral temperatures, comfort ranges, preferred airspeeds and directions) to execute their production work comfortably. Subjective votes were collected from a total of 908 workers with the thermal data, physiological data and adaptive measures recorded simultaneously. Statistical analyses revealed that workers can accept a wider and relatively higher comfort range than the predicted band during cool-dry and hot-dry seasons, for instance, 22.7–29.1 °C and 22.3–30.4 °C respectively. A narrower comfort band (e.g. 28.7–30.9 °C), close to the predicted range, was found during the warm-humid season, which can be maintained by reducing radiant temperature and elevating airspeed. Further analyses indicated that workers prefer a mean airspeed of 0.3  m/s and comfort range of 0–3.0  m/s specific to their activities preferably from inlets located on south, north and east facades while upward and downward air movement, from for example ceiling fans, causes a rise of air temperature in the occupational zone and thermal discomfort. This research also suggested that the maximum distances of workstations from the ventilation inlets (windows) should be maintained at 12–18 meters for sufficient cross ventilation, personal controls and adaptive opportunities to help maintain preferred thermal condition.

KeywordsThermal comfort
Comfort range
Preferred air
Production spaces
Tropical climate
JournalBuilding and Environment
Journal citation157, pp. 319-345
ISSN0360-1323
Year2019
PublisherElsevier
Accepted author manuscript
Digital Object Identifier (DOI)doi:10.1016/j.buildenv.2019.04.048
Web address (URL)https://doi.org/10.1016/j.buildenv.2019.04.048
Publication dates
Published online02 May 2019
Published in print15 Jun 2019
LicenseCC BY-NC-ND 4.0

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