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유성연(Seong-Yeon Yoo),권화길(Hwa-Kil Kwon),이상섭(Sang-Sub Lee),김병채(Byeong-Chae Kim),박동성(Dong-Seong Park) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.11
Fouling is very serious problem in heat exchanger because it rapidly deteriorates the performance of<br/> heat exchanger. Cross-flow heat exchanger with vortex generators is developed, which enhance heat<br/> transfer and reduce fouling. In the present heat exchanger, shell and baffle are removed from the<br/> conventional shell-and-tube heat exchanger. The naphthalene sublimation technique is employed to<br/> measure the local heat transfer coefficients. The experiments are performed for single circular tube,<br/> staggered array tube bank and in-line array tube bank with and without vortex generators. Local and<br/> average Nusselt numbers of single tube and tube bank with vortex generator are investigated and<br/> compared to those of without vortex generator.
유성연(Seong-Yeon Yoo),이제묘(Je-Myo Lee),김영진(Young-Jin Kim),한승호(Seung-Ho Han),한규현(Kyou-Hyun Han) 대한설비공학회 2006 대한설비공학회 학술발표대회논문집 Vol.2006 No.11
The objective of this study is to apply the estimation program of cooling load, which is made for electric power supply and demand control, on general ice thermal storage system. When applying the program, the amount of cooling thermal storage is 0 ㎾ and operating mode is not considerable. The program estimate cooling load using the input values that are only the lowest and highest temperature for the next day. Then the estimated data help an operator to be easily handling the cooling system by calculation data. The estimated values were compared with the real values and investigated. In this way, office working conditions were more pleasant and running cost of ice thermal storage system were reduced.
유성연(Seong-Yeon Yoo),한승호(Seung-Ho Han),이제묘(Je-Myo Lee),한규현(Kyou-Hyun Han),노관종(Kwan-Jong Noh) 대한설비공학회 2006 대한설비공학회 학술발표대회논문집 Vol.2006 No.6
The peak demand of electricity in summer season mainly comes from the day time cooling loads. Ice thermal Storage System (ITSS) uses off-peak electricity at night time to make ice for the day time cooling. In order to maximize the use of cold storage in ITSS, the estimation of day time cooling load for the building is necessary. In this study, we present a method of cooling load estimation using 5 years of normalized outdoor temperature, relative humidity, and the building construction data. We applied the hourly-based estimation to a general hospital building with relatively less sudden heat exchange and the results are compared with the measured cooling load of the building. The results show that the cooling loads estimation depends on the indoor cooling design temperature of the building.
유성연(Seong-Yeon Yoo),한규현(Kyu-Hyun Han) 대한설비공학회 2010 설비공학 논문집 Vol.22 No.11
New methodology is proposed to predict the hourly cooling load of the next day using maximum/minimum temperature and building area. The maximum and minimum temperature are obtained from forecasted weather data. The cooling load parameters related to building area are set through a database provided from reference buildings. To validate the performance of the proposed method, the predicted cooling loads in hourly bases are calculated and compared with the measured data. The predicted results show fairly good agreement with the measured data for benchmarking building.