Journal of the Korean Society for Precision Engineering (한국정밀공학회지)

Korean Society for Precision Engineering (한국정밀공학회)
권호 표지
DOI QR코드

DOI QR Code

Energy Saving Algorithms for Cooling Systems in Machine Tools

공작기계 냉각시스템의 에너지 절감 알고리즘

  • Kim, Taejung (Department of Mechanical Engineering, Dankook University) ;
  • Kim, Taeho (Department of Mechanical Engineering, Dankook University) ;
  • Jee, Sungchul (Department of Mechanical Engineering, Dankook University)
  • Received : 2015.03.09
  • Accepted : 2015.03.19
  • Published : 2015.04.01
Download PDF
⟨ Previous Next ⟩

Abstract

Machine tools usually consume more energy in cooling systems than in spindle motors. This is largely because circulation pumps in the cooling systems are continuously powered to measure the temperature of spindle motors. In this paper, energy saving algorithms are proposed, which modify this behavior of the circulation pumps in such a way that the circulation pumps run only when it is likely that the information on the temperature is critical to bang-bang control of compressors in cooling systems. A mathematical model is established that explains heat transfer phenomena near the spindle motors. The power consumptions are measured for individual components in a machine tool, and the parameters that appear in the mathematical model are estimated. Computer simulations are performed with the estimated parameters, and the results are compared with the experimental ones. It turns out that a large amount of energy can be saved by using the proposed method.

Keywords

References

  1. Today Energy, "Advancement of Carbon Labelling in Korea," http://www.todayenergy.kr/news/articleView.html?idxno=99867 (Accessed 3 March 2015)
  2. Han, J., "Carbon Regulations in EU," Newspaper for Environmental Management, No. 146, 2012.
  3. Cha, J. H., "Statistics of Electric Power in Korea," KEPCO, Vol. 81, pp. 122-123, 2012.
  4. KEPCO, "Electric Rates Table," http://cyber.kepco.co.kr/ckepco/front/jsp/CY/E/E/CYEEHP00301.jsp (Accessed 3 March 2015)
  5. Oda, Y., Kawamura, Y., and Fujishima, M., "Energy Consumption Reduction by Machining Process Improvement," Procedia CIRP, Vol. 4, pp. 120-124, 2012. https://doi.org/10.1016/j.procir.2012.10.022
  6. Lee, S.-W., Yeom, H.-K., Lee, H. K., and Park, K.-J., "Design of an Energy Saving Oil Cooler System using Hot Gas," Int. J. Precis. Eng. Manuf., Vol. 11, No. 3, pp. 375-380, 2010. https://doi.org/10.1007/s12541-010-0043-y
  7. Siemens, "Energy-Efficient Machine Tools Are Economical and Productive with Sinumerik Ctrl-Energy from Siemens," http://www.siemens.com/press/pool/de/pressemitteilungen/2011/drive_technologies/IDT2011073038e.pdf (Accessed 3 March 2015)
  8. Schischke, K., Hohwieler, E., Feitscher, R., Konig, J., Nissen, N. F., et al., "Energy-Using Product Group Analysis-Lot 5: Machine Tools and Related Machinery," http://www.ecomachinetools.eu/typo/reports.html (Accessed 3 March 2015)
  9. Abele, E., Sielaff, T., Schiffler, A., and Rothenbucher, S., "Analyzing Energy Consumption of Machine Tool Spindle Units and Identification of Potential for Improvements of Efficiency," Globalized Solutions for Sustainability in Manufacturing, pp. 280-285, 2011.
  10. Kim, T., Kim, T., and Jee, S., "Standby Strategies for Energy Saving in Peripheral Equipment of Machine Tools," J. Korean Soc. Precis. Eng., Vol. 30, No. 5, pp. 486-492, 2013. https://doi.org/10.7736/KSPE.2013.30.5.486
  11. Kim, T., Kim, T., and Jee, S., "Autonomous Warm-Up Management Algorithm for Energy-Saving in Machine Tools," Proc. of KSPE Spring Conference, p. 1090, 2014.
  12. Kim, T., Kim, T., and Jee, S., "Prediction of Spindle Temperature Behavior for Energy-Saving in Machining Centers," Proc. of KSPE Autumn Conference, p. 5, 2014.