Korean Journal of Air-Conditioning and Refrigeration Engineering (설비공학논문집)

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
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A Study of the Friction Factor Unit Considering the Cost of Energy

에너지비용변화에 따른 경제적 단위마찰저항 값에 대한 고찰

  • Shin, Dong-Shin (Department of Mechanical System Design Engineering, Hongik University) ;
  • Kim, A-In (Department of Mechanical System Design Engineering, Hongik University) ;
  • Lee, Byung-Hyun (Department of Mechanical System Design Engineering, Hongik University) ;
  • Jung, Hyueong-Mok (Department of Mechanical System Design Engineering, Hongik University) ;
  • Lee, Sung-Goo (HIMEC Co., Ltd.)
  • 신동신 (홍익대학교 기계시스템디자인공학과) ;
  • 김아인 (홍익대학교 기계시스템디자인공학과) ;
  • 이병현 (홍익대학교 기계시스템디자인공학과) ;
  • 정형목 (홍익대학교 기계시스템디자인공학과) ;
  • 이성구 (한일엠이씨)
  • Received : 2015.11.02
  • Accepted : 2015.12.24
  • Published : 2016.01.10
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Abstract

The friction factor unit was studied to find a more economic alternative compared to the conventional 30 mmAq/m. The pipe and pump for cooling water piping used in a failing were selected, and the friction factor unit was changed to calculate the pipe diameter and the brake shaft power. Based on current electric charges, After the brake shaft power was converted into operational costs based on current electric charges, then an economic analysis was conducted considering that incorporated the initial installation costs and operational costs for the pump. We found that the friction factor unit when using 20 mmAq/m is more economical than that with 30 mmAq/m, if the piping is used for more than 4 years. The small friction factor unit is desirable when the piping is used for quite a long period of time, and the selection of a more economic friction factor unit should considering the period of usage will be important.

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References

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