Assessment of Thermal Comfort at Manual Car Body Assembly Workstation

Authors: A. R. Ismail, N. Jusoh, M. Z. Nuawi, B. M. Deros, N. K. Makhtar, M. N. A. Rahman

Abstract:

The objective of this study is to determine the thermal comfort among worker at Malaysian automotive industry. One critical manual assembly workstation had been chosen as a subject for the study. The human subjects for the study constitute operators at Body Assembly Station of the factory. The environment examined was the Relative Humidity (%), Airflow (m/s), Air Temperature (°C) and Radiant Temperature (°C) of the surrounding workstation area. The environmental factors were measured using Babuc apparatus, which is capable to measure simultaneously those mentioned environmental factors. The time series data of fluctuating level of factors were plotted to identify the significant changes of factors. Then thermal comfort of the workers were assessed by using ISO Standard 7730 Thermal sensation scale by using Predicted Mean Vote (PMV). Further Predicted percentage dissatisfied (PPD) is used to estimate the thermal comfort satisfaction of the occupant. Finally the PPD versus PMV were plotted to present the thermal comfort scenario of workers involved in related workstation. The result of PMV at the related industry is between 1.8 and 2.3, where PPD at that building is between 60% to 84%. The survey result indicated that the temperature more influenced comfort to the occupants

Keywords: Thermal, Comfort, Temperature, PPD, PMV

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1076766

References:

[1] ASHRAE Handbook - Fundamentals, American Society of Heating, Refrigeratingand Air-Conditioning Engineers, (2005) Inc., Atlanta.
[2] Chubaj, C. A (2002). School Indoor Air Quality. Journal of Instructional Psychology 29(4): 317-
[3] Fanger, P.O. (1970). Thermal Comfort. Danish Technical Press, Copenhagen.
[4] Fisk, W. J. (2000). Health and Productivity Gains From Better Indoor Environments and Their Relationship with Building Energy Efficiency. Annual Review of Energy & The Environment 25(2): 537-566.
[5] Ibrahim Atmaca, Omer Kaynakli, Abdulvahap Yigit. (2007). Effects of radiant temperature on thermal comfort. Building and Environment 42: 3210-3220.
[6] ISO 7730: 1994. Moderate thermal environments: determination of the PMV and PPD indices and specification of the conditions for thermal comfort.
[7] Ka Wing Shek, Wai Tin Chan. (2008). Combined comfort model of thermal comfort and air quality on buses in Hong Kong. Science of the Total Environment 389: 277-282.
[8] Keith J. Moss. (1998). Heat and Mass Transfer in Building Services Design. E & FN Spon. London & New York.
[9] K. C. Parsons. (2000). Environmental ergonomics: a review of principles, methods and models. Applied Ergonomic 581-594.
[10] Maher Hamdi, Gerard Lachiver, Francois Michand. (1999). A new predictive thermal sensation index of human response. Energy and Buildings 29: 167 - 178.
[11] Micheal J. Holmes, Jacob N. Hacker. (2007). Climate change, thermal comfort and energy: Meeting the design challenges of the 21st century. Energy and Building 39: 802-814.
[12] Nishi, Y., Gagge, A.P. (1977). Elective temperature scale useful for hypo- and hyper-baric environments. Aviat. Space Environ. Med. 48, 97, 107.
[13] Roberto Z. Freire, Gustavo H. C. Oliveira, Nathan Mendes. (2008). Predictive controllers for thermal comfort optimization and energy savings. Energy and Buildings 40: 1353-1365.
[14] Shiaw-Fen Ferng, L. W. L. (2002). Indoor Air Quality Assesment of Day-Care Facilities with Carbon Dioxide, Temperature, and Humidity as Indicator. Journal of Environmental Health 65(4): 14-18.
[15] Son H. Ho, Luis Rosario, Muhammad M. Rahman. (2008). Thermal comfort enhancement by using a ceiling fan. Applied Thermal Engineering. University of South Florida.
[16] Todoroviv B. (2004). Envelopes of building - the most influential factor of its energy efficiency. In: TTMD VI. International HVAC + R technology symposium, Istanbul, Turkey, p. 409-13.
[17] Thermal comfort in the workplace: Guidance for employers (1999). Health & Safety Executive (HSE).
[18] Wilson, S. (2001). Graduating to Better AQ. Consulting- Specifying Engineer 29(6): 24-28.
[19] Y. Guan, M. Hosni, B.W. Jones, T.P. Gielda. (2003). Literature review of the advances inthermal comfort modeling. ASHRAE Transactions 109 (2): 908-916.