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에너지비용변화에 따른 경제적 단위마찰저항 값에 대한 고찰A Study of the Friction Factor Unit Considering the Cost of Energy
- Other Titles
- A Study of the Friction Factor Unit Considering the Cost of Energy
- Issue Date
- 2016
- Publisher
- 대한설비공학회
- Keywords
- Pipe(배관); Frictional resistance(마찰저항); Energy cost(에너지비용); Office building(사무용 건물); Hazen-Williams equation(하겐-윌리엄즈 방정식)
- Citation
- 설비공학 논문집, v.28, no.1, pp.29 - 34
- Journal Title
- 설비공학 논문집
- Volume
- 28
- Number
- 1
- Start Page
- 29
- End Page
- 34
- ISSN
- 1229-6422
- 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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