http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
태양열 난방 시스템에 적용되는 축열조의 성층화에 관한 연구
홍희기,김효경,Hong, Hi-Ki,Kim, Hyo-Kyung 대한설비공학회 1986 설비저널 Vol.15 No.1
An experiment on the devices that enchance the stratification of storage tanks in a solar heat ins system has been carried out. The benefits of thermal stratification in sensible heat storage are to increase the system performance such as the collector efficiency or the fraction of the total load supplied by solar energy. Using the diffuser and the distributor as the stratification enchancement device, the expeliments were perfomed in the different condition of diameter and material of the distributor. As a result of experiments, there exists the diameter of distributor in which the stratification is made maximum under certain design and operation condition. Also it was identified that the kind of distributor material influenced the degree of stratification. Comparing the experimental result to the computational results calculated under the same conditions, the node number N(stratification index) was determined. The results of computer simulation that was performed about the actual solar heating system in Seoul for 24 hours show the relative advantage of stratified over well-mixed storage and the significant improvements in system performance.
홍희기 대한설비공학회 2014 설비저널 Vol.43 No.9
에너지 시스템 해석용 프로그램인 TRNSYS를 활용하여 태양열 온수급탕 및 냉·난방 시뮬레이션 방법과 관련되는 구성요소를 소개하고자 한다.
FREEZE PROTECTION METHOD USING HOT WATER FOR PASSIVE SOLAR WATER HEATING SYSTEM
홍희기,김종현,정재동,HIROYUKI KUMANO,Douglas Reindl 대한설비공학회 2012 International Journal Of Air-Conditioning and Refr Vol.20 No.4
In the present work, a new freeze protection method is introduced with intended applications for passive solar water heaters. Though electro-thermal wire heat tracing is popularly used to prevent freezing with subsequent risk of burst, this approach is problematic due to resistance heater failure and excessive electric power consumption. In the experimental device, hot water in thermal storage tank is used to heat the outlet pipe from the tank when the surface temperature of the pipe falls lower than a pre-determined set point. The cold water pipe to the thermal storage tank is installed in direct contact with the hot water pipe, controlling its temperature by conduction with the hot water pipe.