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A New Variable Refrigerant Flow System Simulation Approach in EnergyPlus
Xiaojie Lin,Hoseong Lee,Yunho Hwang,REINHARD RADERMACHER,Byung-Soon Kim 대한설비공학회 2016 International Journal of Air-Conditioning and Refr Vol.24 No.1
A variable refrigerant °ow (VRF) system is widely applied to build air conditioning systems. Literature review of previous VRF modeling studies was conducted, and it was found that the current calculation approach in EnergyPlus can result in more than 20% deviation in both heat transfer capacity and power consumption. Therefore, a new VRF model is proposed in this study, which includes an improved thermal zone distribution concept, new indoor unit types, and a new thermodynamic model. The developed model is validated with experimental data within 10% in heat transfer capacity and 5% in power consumption. Based on the proposed model, the operation control strategy is also discussed. The results show that the proposed model could also simulate the current control strategy in the VRF system.
Jingjing Lin,Song Yan,Xiaojie Zhang,Yueran Liu,Jun Lian,Hualin Lin,Wei Wei,Deli Lu,Sheng Han 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2019 NANO Vol.14 No.4
Holey Fe-Anderson-type polyoxometalate/polyaniline/graphene (PPG) hybrid materials were first prepared by anchoring Anderson-type polyoxometalates [FeMo6O24H6]3- (FeMo6) onto graphene modified with polyaniline via a facile hydrothermal treatment. The as-prepared materials exhibited an excellent electrochemical performance with a high specific capacitance of 1366 F g -1 at 1 A g -1 and outstanding cycling stability (97.6% capacitance retention after 5000 cycle times). The uptake of polyaniline/FeMo6 nanoparticles on graphene not only provided the pseudocapacitance but also weakened the aggregation between the graphene layers, resulting in a higher surface area compared with pure graphene. In addition, the AC//PPG-15 asymmetric supercapacitor device showed a high energy density of 24.65 W h kg -1 at a low power density of 326.25 W kg -1 and good cycling stability (94.82% capacitance retention after 5000 cycles). Hence, the as-prepared PPG hybrid materials in this work possess tremendous potential as electrodes for high-performance supercapacitors.
An Electro Optical Honeycomb Networks-on-Chip based on a New Nonblocking Switch
Xiaojie Yin,Huaxi Gu,Honghao Ju,Lin Jia 대한전자공학회 2008 ITC-CSCC :International Technical Conference on Ci Vol.2008 No.7
Network-on-Chip (NoC) is an emerging paradigm for communications within large VLSI systems implemented on a single silicon chip. However, the electronic network on chip design faces many problems like energy consumption, bandwidth and QoS. Compared with traditional electronic NoC, optical Network on Chip exhibits advantages of high-bandwidth, low latency and power dissipation. In this paper, a new 4×4 optical non-blocking switch is introduced on the basis of the latest development of nanophotonic technologies and of the prompt progress of optical integration technologies. The new approach can solve the problem of internal blocking with a fine symmetrical feature, while it needs the minimal number of resonators. Optical-loss budget under this architecture is also evaluated, calculated and compared with currently existing optical switches in this paper. An electro optical honeycomb network-on-chip is constructed based on the new switch architecture. It functions with low power dissipation and high bandwidth for the future network on chip.
Performance investigation on solid desiccant assisted mobile air conditioning system
Lee, Hoseong,Lin, Xiaojie,Hwang, Yunho,Radermacher, Reinhard Elsevier 2016 Applied thermal engineering Vol.103 No.-
<P><B>Abstract</B></P> <P>In the conventional mobile air conditioning system, the temperature and humidity control is achieved by a vapor compression system. This system cools the air down to lower than the dew point temperate of the cabin to control the humidity. Thus, reheating of the air is necessary. These two factors could increase the fuel consumption of the system. To overcome these issues, a solid desiccant assisted mobile air conditioning system is proposed and investigated. The desiccant assisted technology can separate the latent heat load from the sensible heat load, which will effectively increase the evaporating temperature and reduce the power consumption of the compressor. It is proposed to apply the solid desiccant to the mobile air conditioning system to handle most of latent load, while the vapor compression cycle handles the remaining latent load and sensible load. The model of the proposed concept is developed and validated with experimental data. Lastly, the possible configurations of the solid desiccant assisted mobile air conditioning system are discussed.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A solid desiccant assisted MAC system is proposed and investigated. </LI> <LI> The developed model is validated with experimental data. </LI> <LI> The proposed system reduced the power consumption by 26.3%. </LI> <LI> Possible system configurations of the solid desiccant assisted MAC are discussed. </LI> </UL> </P>
Ultrafast epitaxial growth of metre-sized single-crystal graphene on industrial Cu foil
Xu, Xiaozhi,Zhang, Zhihong,Dong, Jichen,Yi, Ding,Niu, Jingjing,Wu, Muhong,Lin, Li,Yin, Rongkang,Li, Mingqiang,Zhou, Jingyuan,Wang, Shaoxin,Sun, Junliang,Duan, Xiaojie,Gao, Peng,Jiang, Ying,Wu, Xiaoson Elsevier 2017 Science bulletin Vol.62 No.15