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SIMULATION-BASED DESIGN METHOD FOR ROOM AIR CONDITIONER WITH SMALLER DIAMETER COPPER TUBES
Guoliang Ding,TAO REN,YONGXIN ZHENG,YIFENG GAO,JI SONG 대한설비공학회 2012 International Journal Of Air-Conditioning and Refr Vol.20 No.3
Promoting the use of smaller diameter tube in room air conditioner is bene¯cial to reduce copper consumption and refrigerant charge, but may cause reduction of air conditioner performance, so a design method is needed. This paper presents a simulation-based design method for air conditioner with smaller diameter tube. The new method combines heat exchanger simulator and knowledge-based evolution method optimizer for designing air conditioner heat exchanger with smaller diameter tube. The simulation-based design method is illustrated in detail by an air conditioner of replacing 7mm tube indoor unit heat exchanger and 9.52mm tube outdoor unit heat exchanger with 5mm tube. Case study shows that the cost of the designed air conditioner with 5mm copper tube is 17.3% lower than that of the original one while the performance deviation between these two air conditioners is less than 0.7%.
Composition modulation of Cu/Cu2O/CuO nanoparticles supported on carbon for p-nitrophenol reduction
Jia Li,Wei Liu,Yongxin Ding,Likui Liu,Fang Li,Qiming Li 한국화학공학회 2019 Korean Journal of Chemical Engineering Vol.36 No.6
Porous carbon supported Cu/Cu2O/CuO ternary catalysts were fabricated by pyrolysis, in which composition modulation of Cu/Cu2O/CuO was successfully realized by adjusting annealing atmosphere. The correlation between annealing atmosphere and composition of Cu/Cu2O/CuO ternary nanoparticles was deeply investigated. XRD and SEM measurement shows that the composition proportion of Cu/Cu2O/CuO can be effectively controlled by adjusting the annealing atmosphere. HR-TEM and EDS analysis showed that Cu/Cu2O/CuO ternary nanoparticles are highly dispersed into the carbon matrix and harvest more hetero-junction active sites. The effect of Cu/Cu2O/CuO composition on their catalytic activity was investigated in catalytic reduction from p-nitrophenol to p-aminophenol. The experimental result indicated that the catalytic activity of Cu/Cu2O/CuO ternary catalysts exhibits higher catalytic activity than Cu2O/CuO or CuO particles. This work provides a new strategy for synthesizing and modulating porous carbon-supported Cu/Cu2O/CuO ternary nanoparticles.