naa a22 4500 510822134 CHVBK 20180411083538.0 cr unu---uuuuu 180411e20130601xx s 000 0 eng 10.1007/s12541-013-0117-8 doi (NATIONALLICENCE)springer-10.1007/s12541-013-0117-8 A numerical approach to energy savings in heat drying process of drilled and water-cleaned PCB [Elektronische Daten] [Gyu-Bong Lee, Tae-Jun Ku, Young-Shin Kim, Seungwook Kim, Seong-Wook Cho] The post-drill cleaning process, one of processes to manufacture Printed Circuit Boards (PCBs), can be divided into water cleaning and heat drying processes. The various contaminants occurred during the drilling process are removed in the water cleaning process. The remaining moisture after this process is thoroughly removed by vaporization during the heat drying process. In this paper, the heat drying process of PCBs that have been drilled and water-cleaned prior to drying, is modeled and investigated for a Computational Fluid Dynamics (CFD) analysis. The Human-Machine Interface (HMI) system configured by using the Ubiquitous Sensor Node (USN) and the Machine-to-Machine (M2M) device is proposed in order to measure interior temperatures of the drying system and to define boundary conditions for the CFD analysis. Currently, six heaters are in operation by workers for the heat drying process as customary. However, it was shown through the experimental measurement and numerical analysis that the heat drying process is possible with operating only 4 heaters. The electrical power consumption of the case where 4 heaters are operated shows 33% of decrease from that of the case where 6 heaters are operated. For a near future study, a structural improvement of the drying system will be proposed with research on parameters that are influential on the performance of the system as one of the measures for a further reduction of electrical power consumption. Korean Society for Precision Engineering and Springer-Verlag Berlin Heidelberg, 2013 Post-drill cleaning nationallicence Heat drying process nationallicence CFD analysis nationallicence M2M device nationallicence HMI system nationallicence Electrical power consumption nationallicence A : area of dryer wall nationallicence C p : specific heat of fluid nationallicence e sta : internal energy of a fluid nationallicence h : convective heat transfer coefficient nationallicence h sta : static enthalpy nationallicence h tot : total enthalpy nationallicence m : mass flow of hot air flown in through air knives nationallicence m out : mass flow of hot air going out the exhaust nationallicence N : points where temperature is measured or interpolated nationallicence p : pressure of fluid nationallicence Q in : heat flown in through air knives nationallicence Q late : latent heat nationallicence Q out : heat going out the exhaust nationallicence Q wall : heat going out through the outer wall nationallicence T : temperature of fluid nationallicence S M : momentum source term nationallicence S E : energy source term nationallicence U : velocity of fluid nationallicence λ : thermal conductivity nationallicence ρ : density of fluid nationallicence τ : shear stress by fluid nationallicence [ K ] : coefficient matrix nationallicence [ R ] : vector of the right hand side of discretized equations nationallicence [ X ] : solution vector nationallicence ∇ : gradient operator nationallicence ⋇ : tensor product of two vectors nationallicence Lee Gyu-Bong Korea Engineering Plant Technology Center, KITECH, 55 Hanyangdaehak-ro, Sangrok-gu, Ansan-si, 426-791, Gyeonggi-do, Korea aut Ku Tae-Jun Korea Engineering Plant Technology Center, KITECH, 55 Hanyangdaehak-ro, Sangrok-gu, Ansan-si, 426-791, Gyeonggi-do, Korea aut Kim Young-Shin CEO, Songwol Circuit Co., Ltd., 34 Neungan-ro, Danwon-gu, Ansan-si, 425-100, Gyeonggi-do, Korea aut Kim Seungwook School of Mechanical Engineering, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, 156-756, Seoul, Korea aut Cho Seong-Wook School of Mechanical Engineering, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, 156-756, Seoul, Korea aut International Journal of Precision Engineering and Manufacturing Korean Society for Precision Engineering 14/6(2013-06-01), 891-895 2234-7593 14:6<891 2013 14 12541 https://doi.org/10.1007/s12541-013-0117-8 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s12541-013-0117-8 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Lee Gyu-Bong Korea Engineering Plant Technology Center, KITECH, 55 Hanyangdaehak-ro, Sangrok-gu, Ansan-si, 426-791, Gyeonggi-do, Korea aut NATIONALLICENCE 700 1- Ku Tae-Jun Korea Engineering Plant Technology Center, KITECH, 55 Hanyangdaehak-ro, Sangrok-gu, Ansan-si, 426-791, Gyeonggi-do, Korea aut NATIONALLICENCE 700 1- Kim Young-Shin CEO, Songwol Circuit Co., Ltd., 34 Neungan-ro, Danwon-gu, Ansan-si, 425-100, Gyeonggi-do, Korea aut NATIONALLICENCE 700 1- Kim Seungwook School of Mechanical Engineering, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, 156-756, Seoul, Korea aut NATIONALLICENCE 700 1- Cho Seong-Wook School of Mechanical Engineering, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, 156-756, Seoul, Korea aut NATIONALLICENCE 773 0- International Journal of Precision Engineering and Manufacturing Korean Society for Precision Engineering 14/6(2013-06-01), 891-895 2234-7593 14:6<891 2013 14 12541 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer