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자료유형
학술대회자료
저자정보
저널정보
대한설비공학회 대한설비공학회 학술발표대회논문집 대한설비공학회 1998년도 하계학술발표회 논문집(Ⅱ)
발행연도
1998.6
수록면
682 - 688 (7page)

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The district heating and cooling offers a high efficiency of energy utilization and a merit in its maintenance by utilizing centralized heat management. Large pumping power, however, is required because the water has to travel long distance from it's heat source to users. In the present study, it is investigated that by adding a very small quantity of drag reduction additives to the District Cooling system it becomes possible to obtain a significant drag reduction and less pumping power for the district cooling system. Water-soluble polymers, surfactants, and environmentally-friendly degradable polymer are utilized as effective drag reducing additives. Experiments have been carried out for water velocities, and percent drag reductions are compared with various additive solutions as a function of circulation time at 100 wppm concentration. In case without SDS as an anionic surfatant, copolymer was most effective in percent drag reduction. In case of mixing copolymer with SDS, it is found that there exists an optimal conditions. It is found that environmentally-friendly degradable polymer, xanthan gum can be also considered as significant drag reduction additive. In ice slurry system, it is found that the system gives less pressure drops compared with chilled water system in a certain conditions. And drag reduction additive was also effective for the case of adding drag reduction additive to ice slurry system.

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2. 마찰저항

3. 실험

4. 실험결과 및 고찰

5. 결론

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