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가정용 냉동사이클 성능향상을 위한 two-phase ejector의 최적 적용 방안 연구
전용석(Yongseok Jeon) 대한설비공학회 2019 대한설비공학회 학술발표대회논문집 Vol.2019 No.11
An ejector, which is a possible replacement for conventional expansion devices, such as capillary tubes, orifice and thermostatic expansion valves, has been proposed to save energy during the expansion process in the refrigeration cycle. Conventional ejectors were mainly studied high capacity or high operating pressure resulted in high expansion loss. However, ejectors can considerably decrease power consumption in households if they are applied to small capacity refrigeration cycles, such as refrigerators or residential air conditioners. The objective of this study is to investigate the performance characteristics of the ejector cycle, especially focusing on a household refrigeration cycle. To achieve the objective of this study, refrigerator-freezer (RF) test-bench, condenser outlet split (COS) ejector RF prototype, and ejector air-conditioning system were designed and tested with various operating and geometrical conditions.
응축기 출구 스플릿 이젝터 적용 R600a 가정용 냉장고에 관한 실험적 연구
전용석(Yongseok Jeon),김용찬(Yongchan Kim) 대한설비공학회 2019 대한설비공학회 학술발표대회논문집 Vol.2019 No.4
The objective of this study is to investigate the performance characteristics of an R600a domestic refrigerator-freezer adopting a condenser outlet split (COS) ejector cycle. Experiments are conducted to measure the performances of conventional and COS ejector-based domestic RFs using R600a. A test bench is used to analyze the pressure lifting effect, mass flow rate variation, and coefficient of performance (COP) improvement with respect to the entrainment ratio (ER). The COP improvement of the COS ejector cycle over that of the baseline cycle increased with the decrease in ER, owing to the reduction in expansion loss.
순간냉각식 정수기 냉수조의 설계변수에 따른 성능 특성에 관한 해석적 연구
전용석(Yongseok Jeon),박홍희(Honghee Park),이주성(Jooseoung Lee),김용찬(Yongchan Kim) 대한설비공학회 2012 설비공학 논문집 Vol.24 No.7
The objective of this study is to analyze the effect on the energy consumption of an instant cooling type water purifier by the design parameters of the cooling tank. Initially, the simulation program was developed and verified. The simulation results showed that the energy consumption was reduced by replacing the shape of the cooling tank from a rectangular to a cube, increasing the evaporator length, decreasing the volume of the cooling tank, and increasing the performance of the insulator. The order of the effect magnitude on the energy consumption was as follows; volume of the cooling tank, conductivity and thickness of the insulator, shape of the cooling tank, length of the evaporator, and length of the water tube.
액인젝션을 적용한 열펌프의 운전변수에 따른 성능 특성에 관한 해석적 연구
전용석(Yongseok Jeon),이상헌(Sanghun Lee),강훈(Hoon Kang),김용찬(Yongchan Kim) 대한설비공학회 2013 대한설비공학회 학술발표대회논문집 Vol.2013 No.6
Air-source heat pump shows the performance degradation at severe ambient temperatures. Many researches on injection technique have been conducted in recent years. In this study, a simulation program for a heat pump cycle with liquid injection technique was developed. The simulation model was developed based on the mass and energy balances, and verified by the experiments at various operating conditions. This study discussed cycle performance characteristics with the operating parameters by the simulation program.