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Xu H.J.,China University of Petroleum - East China | Luo X.,China University of Petroleum - East China | Mao Q.J.,Green Energy Group | Gong L.,China University of Petroleum - East China | Huang S.B.,China University of Petroleum - East China
Applied Mechanics and Materials | Year: 2014

Considerable cold energy embodied in liquefied natural gas (LNG)can be recycled in LNG regasification, which can not only save energy but also avoid cold pollution within the low-temperature fluid emission. Review on both domestic and overseas is conducted on the recycling of LNG cold energy in different applications. Against the single purpose utilization of LNG cold energy with a large amount of energy loss, the cascade recycling strategy is proposed for highly-efficient utilization of LNG cold energy. Based on the defined cold exergy efficiency, the exergy analysis is performed for some different recycling applications of LNG cold energy. The system exergy rate method is used to compare the superiority of modes in which the LNG is converted into NG under normal temperature. The results show that the exergy efficiency of a LNG cold energy cascade recycling system is higher than that of asingle utilization system. Apart from the improved efficiency, the cascade recycling strategy can expand the applicable temperature range of LNG cold energy compared with the single utilization. Finally, the entropy and entransy for evaluating the LNG cold energy transport process are compared and discussed, from which it is indicated that entransy is more appropriate for the heat transfer process with low-temperature or large temperature difference, as is the case for LNG cold energy recycling. © (2014) Trans Tech Publications, Switzerland.

Choi M.,Myongji University | Cierpka C.,University of Federal Defense Munich | Kim Y.-H.,Green Energy Group
European Journal of Mechanics, B/Fluids | Year: 2014

Two dimensional unsteady numerical simulations were conducted using a commercial code with a userdefined- function to investigate the effect of the distance between two cantilevers vibrating in counterphase or in phase. The performance of the cantilevers with different distances was mainly evaluated by the time-averaged axial velocity and the mass flow rate. It is evident that there is no interaction between the vortices by two cantilevers if they are too far apart. However, if two cantilevers are too close, they hinder each other in vortex generation. In particular, the interaction between two inner vortices generates a reversed flow which has a negative effect on the performance. Unless the distance is too close, the performance of the cantilever pair vibrating in counter-phase is always superior to the cantilever pair vibrating in phase. The optimal distance between two cantilevers in counter-phase is approximately equal to twice the size of a fully-grown vortex generated by the single cantilever, while there is no distinct optimal distance for a cantilever pair vibrating in phase. In case the distance is larger than three times the vortex size, the flow field generated by each cantilever is similar to the flow field of a single cantilever, which implies that two cantilevers work independently of each other. © 2013 Elsevier Masson SAS. All rights reserved.

Bokhove J.,TU Eindhoven | Kerkhof P.J.A.M.,TU Eindhoven | Schuur B.,Green Energy Group | de Haan A.B.,Technical University of Delft
Chemical Engineering Science | Year: 2015

Solvent impregnated resins are promising for the removal of polar organic compounds from aqueous streams, but have low mass-transfer rates. A thorough understanding of the phenomena occurring inside the pores of the solvent impregnated resin is therefore required. In this study a mathematical model was developed to describe the simultaneous diffusion and reaction. The diffusion was described using the Maxwell-Stefan approach towards multi-component diffusion and included the volume-expansion of the organic phase. The model was validated using experimental data from the literature on the extraction of phenol by Cyanex923 impregnated in macro-porous polypropylene. The model described the experimental data as function of temperature and initial concentration accurately with an R2>0.96 and a regressed reaction rate constant with a confidence interval of ± 6%. Analysis of the model results revealed that multi-component effects as described by the Maxwell-Stefan model were of limited importance whereas the volume expansion was essential to accurately describe the experimental data. © 2015 Elsevier Ltd.

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