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Ji Hwan Jeong,Young Chel Kweon,Keun Sun Chang 대한설비공학회 2004 International Journal Of Air-Conditioning and Refr Vol.12 No.1
Experiments have been conducted in order to make comparisons of characteristics of a R410a cycle with a R22 cycle in terms of cooling capacity and coefficient of performance (COP). The parameters examined in the present work include air flow rate, indoor and outdoor air temperatures, and indoor relative humidity. These two refrigeration cycles constructed for this study share all components except compressor, accumulator, oil separator, and piping. The measurements were made using a psychrometric calorimeter. The experimental results show that the R410A cycle has several advantages for indoor units while the R22 cycle yields better performance for outdoor units.
Various Heat Exchangers Utilized in Gas-Turbines for Performance Enhancement
Ji Hwan Jeong,Lae Sung Kim,Man Young Ha,Kui Soon Kim,Jong Rae Cho 대한설비공학회 2008 International Journal Of Air-Conditioning and Refr Vol.16 No.1
Modem world takes advantages of gas-turbines for various purposes. Most of gas-turbines incorporate various heat exchangers in order to achieve specific functions and enhance thermal efficiency as well. This paper reviews heat exchangers that had been used, currently being used, and under development for the future application in various kinds of gas turbines. The heat exchanger matrix configurations and manufacturing methods depend on where they are applied. This review work shows that the recent advancement in heat exchanger technologies makes it possible to develop intercoolers and recuperators for large gas turbines as well as micro gas turbines.