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임효준(Hyo Joon Lim),이주경(Ju Kyoung Lee),황준현(Jun Hyeon Hwang),이경창(Kyung Chang Lee),이석(Suk Lee) Korean Society for Precision Engineering 2016 한국정밀공학회지 Vol.33 No.6
Unlike household refrigerators, commercial refrigerators are composed of separate indoor and outdoor units. The outdoor unit of most commercial refrigerators is designed to run at a fixed speed, which results in low energy efficiency and loud fan noise. Moreover, it cannot respond flexibly to changing thermal load in the indoor unit. Inverter type outdoor units can address such problems through speed changes based on information obtained from the indoor unit. However, using two units from different manufacturers is often not a viable solution. If condition changes in the indoor unit can be detected without communication between the two units, it is possible to adjust the speed of the outdoor unit. This paper attempts to analyze the signal from the outdoor unit when the condition of the indoor unit changes by varying the thermal load.
니켈촉매를 이용한 온도 및 공간속도 변화에 따른 메탄화 반응 특성
김수현(Kim, Sy-Hyun),유영돈(Yoo, Young-Don),류재홍(Ryu, Jae-Hong),변창대(Byun, Chang-Dae),임효준(Lim, Hyo-Jun),김형택(Kim, Hyung-Taek) 한국신재생에너지학회 2010 신재생에너지 Vol.6 No.4
Syngas from gasification of coal can be converted to SNG(Synthesis Natural Gas) through gas cleaning, water gas shift, CO₂ removal, and methanation. One of the key technologies involved in the production of SNG is the methanation process. In the methanation process, carbon oxide is converted into methane by reaction with hydrogen. Major factors of methanation are hydrogen-carbon oxide ratio, reaction temperature and space velocity. In order to understand the catalytic behavior, temperature programmed surface reaction (TPSR) experiments and reaction in a fixed bed reactor of carbon monoxide have been performed using two commercial catalyst with different Ni contents (Catalyst A, B). In case of catalyst A, CO conversion was over 99% at the temperature range of 350{sim}420?C and CO conversions and CH₄ selectivity were lower at the space condition over 3000 1/h. In case of catalyst B, CO conversion was 100% at the temperature over 370?C and CO conversions and CH₄ selectivity were lower at the space condition over 4700 1/h. Also, conditions to satisfy CH₄ productivity over 500 ml/h.g-cat were over 2000 1/h of space velocity in case of catalyst A and over 2300 1/h of space velocity in case of catalyst B.