http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
윤영중(Young Jung Yun),이재헌(Jae Heon Lee),김용모(Yong mo Kim),홍기상(Gi Sang Hong) 대한설비공학회 2016 대한설비공학회 학술발표대회논문집 Vol.2016 No.11
Geothermal air conditioning system is a combination of equipment that supplies cooling using Ground Source Heat Pump Equipment Features of geothermal cooling system supplies the cooling for the building by using a constant temperature throughout the year of the earth. This study estimates the cooling energy consumption by using the data collected using flow rate, supply temperature, return temperature, outdoor temperature and the accumulated amount of power from January 2013 December 2015. Geothermal cooling system is consistent with the expected maximum demand of air conditioning and installation of a geothermal cooling system for the resort season in the resort.
물-공기 횡류시 U 자형 튜브 다발에서의 유체탄성불안정
주인철(In-Cheol Chu),정흥준(Heung June Chung),이창희(Chang Hee Lee),윤영중(Young Jung Yun),정한섭(Han-Sub Chung),변형현(Hyung Hyun Byun),김무용(Moo Yong Kim),문효익(Hyo Ik Moon),이희남(Hui Nam Rhee) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
In the present study, a series of experiments have been performed to investigate a fluid-elastic instability of an U-tube bundle in air-water two-phase cross-flow. A total of 39 prototypic U-bend tubes are arranged in a rotated square array with a p/d of 1.633, which is identical to U-bend tube bundle of OPR1000 steam generators. The present experimental facility has 2-span U-tubes in contrast to 9-span U-tubes of OPR1000 steam generators. However, modal analysis shows that the major vibration mode and corresponding natural frequencies are almost same to the full 9-span U-tubes. A total of 12 3-axis acceleromters are installed inside U-tubes to monitor a precise vibration motions. The following parameters were obtained throughout a series of experiments: tube vibration responses and critical velocity for fluid-elastic instability, two-phase damping ratio, hydrodynamic mass. Finally, the instability factor (K) of Connors’ relation was evaluated based on the above measured parameters.