Thermal comfort study of plastics manufacturing industry in converting process
Treść / Zawartość
Thermal comfort study of plastics manufacturing industry in converting process. Thermal comfort is one of ergonomics factors that can create a significant impact to workers performance. For a better thermal comfort, several environment factors (air temperature, wind speed and relative humidity) should be considered in this research. The object of the study is a building for converting process of plastics manufacturing industry located in Malang, Indonesia. The maximum air temperature inside the building can reach as high as 36°C. The result of this study shows that heat stress is dominantly caused by heat source from machine and wall building. The computational fluid dynamics (CFD) simulation is used to show the air characteristic through inside the building. By using the CFD simulation, some scenarios of solution are successfully presented. Employees thermal comfort was investigated based on predicted mean vote model (PMV) and predicted percentage of dissatisfied model (PPD). Existing condition gives PMV in range from 1.83 to 2.82 and PPD in range from 68.9 to 98%. Meanwhile, modification of ventilation and replacing ceiling material from clear glass into reflective clear glass gave significant impact to reduce PMV into range from 1.63 to 2.18 and PPD into range from 58.2 to 84.2%. In sort, new design converting building process has more comfortable for workers.
- ASHRAE (2004). ASHRAE Standard 55-2004, Thermal Environmental Conditions for Human Occupancy. Atlanta: ASHRAE.
- Chaiyapinunt, S., Phueakphongsuriya, B., Mongkornsaksit, K. & Khomporn, N. (2004). Performance Rating of Glass Windows and Glass Windows with Films in Aspect of Thermal Comfort and Heat Transmission. Elsevier B.V.
- Chung, T.J. 2002. Computational Fluid Dynamics. Cambridge: Cambridge University Press.
- Koch-Neilsen, H. (2002). Stay Cool: A Design Guide for the Built Environment in Hot Climates. Earthscan Publications.
- OSHA (2012). Heat Stress. Minnesota: Department of Labor and Industry.
- OSHS (1997). Extremes of Temperature. Wellington, New Zealan SDd.: The Occupational Safety and Health Sevice.
- ISO (1994). ISO 7730: Moderate Thermal Environments – Determination of the PMV and PPD Indices and Specifi cation of the Conditions for Thermal Comfort. Switzerland: ISO.
- Stanton, N., Hedge, A., Brookhuis, K., Salas, E. & Hendrick, H. (2005). Handbook of Human Factors and Ergonomics Methods. United State of America: CRC Press.
- Yayi, A. (2012). Comfort Temperature or the Low-Income Group in a Hot-Humid Climate. Proceeding of 7th Windsor Conference, London UK.