Workshop lighting and building retrofit for visual quality and usability efficiency: case study of welding and sheet metal workshop, Phrae Technical College
Good lighting is essential to perform activities successfully and safely. Inadequate artificial or natural lighting level may lead to errors or injuries. Lighting, therefore, plays an important part in the design of high risk areas such as metal workshops in technical colleges where vision is very demanding. At Phrae technical college, the workshops on floor 1 and 3, which are designed in accordance with the vocational education commission’s standard, were found to have problems with insufficient illuminance levels. The amount of natural light and artificial light in the workshops are far below the recommended levels in standards. This study aims to explore the natural lighting and artificial lighting strategies to increase the amount of light in the workshops to meet the standards. DiaLux Evo, a lighting simulation software, was used as a tool to simulate lighting in the workshops throughout the operation times on 4 key dates. The study found that the maximum amount of natural lighting is achieved by the combined design of the light shelf, the fiberglass shading, the change from aluminum to glass louvers and the flat ceiling. In the workshop on floor 1, the amount of light is increased by 172 Lux or 283%. In the workshops on floor 3, the amount of light is increased by 447 Lux or 103%. For artificial lighting, refitting the lighting with the arrays of 104 LED lamps results the amount of light is increased by 419 Lux or 157% increase in illuminance with only 13% increase of energy consumption on floor 1 and the amount of light is increased by 503 Lux or 190% increase in illuminance with only 19% increase of energy consumption on floor 3. But not enough for requirements lighting , floor 1 at 300 Lux and floor 3 at 500 Lux. In summary, despite the building retrofit, the quantify of natural lighting alone is not adequate to accommodate workshop activities, efficient artificial
lighting is needed. The best result of the improvement is the installation of fiberglass awning at a distance of 1.10 meters, 0.85 meters in size, changing the aluminum sheet to clear glass. Install an external light shelf size 1.10 meters. Install a flat type ceiling. And changing the artificial lighting system into a 27 27-watt LED lamp. This new artificial lighting system results in a slight increase in energy consumption but the quantity and quality of lighting is very much improved. The results from this study can be applied in other metal workshops to improve lighting conditions.
Angsananwattana, W. (2006). Karn oakbab hing sathon saeng lae fa phedan phuea karn chai prayot chak saeng thammachat yang mee prasitthiphap samrab arkhan samnakngan. (In Thai) [Light shelves and ceiling design for efficient daylighting in office buildings] (Master’s thesis). Bangkok: Thammasat University.
Illuminating Engineering Association of Thailand. (2016). Khumue neawtang karn oakbab karn song sawang phainai arkhan. (In Thai) [Guidelines for indoor lighting design]. Bangkok: Author.
Kuaprom, S. (2019). Karn sueksa phuea prayat kha phalangngan faifa khong Mahawitthayalai muban Chombueng. (In Thai) [Study of electrical energy saving for muban Chombueng Rajabhat University, Ratchaburi Province] (Master’s thesis). Bangkok: Siam University.
Lam, W. (1986). Sunlighting as formgiver for architecture. New York: Van Nostrand Reinhold.
Office of the National Economic and Social Development Council. (2017). The Twelfth National Economic and Social Development Plan (2017-2021). Retrieved March 9, 2019, from https://data.opendevelopmentmekong.net/library_record/12
Robbins, C.L. (1986). Daylighting: design and analysis. New York: Van Nostrand Reinhold.
Saihong, N. (2007). Neawtang karn oakbab saengsawang nai hong rian sue phasom. (In Thai) [Guidelines for lighting design in multimedia classroom] (Master’s thesis). Bangkok: Thammasat University.
Sirithatsanakun, P. (2001). Karn chat lae wangphaen rong fuek ngan. (In Thai) [Organization and planning of internships]. Encylopedia of Education, 23, 23-40.
Tangpoonsupsiri, T. (2001). Neawtang karn prubprung khunnaphab khong saeng phainai hong rian phuea kwam sabai ta lae pen neawtang karn oakbab hong rian nai chonnabot. (In Thai) [An approach to improve visual comfort in classroom for rural areas] (Master’s thesis). Bangkok: Chulalongkorn University.
Upapong, S. & Chaiyakul, Y. (2013). Karn chai saeng thammachat nai arkhan phan tho nam saeng neaw ding. (In Thai) [Daylighting in building through a vertical light pipe]. Built Environment Inquiry Journal Faculty of Architecture Khon Kaen University, 1 (1), 78-85.