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Articles 121 - 129 of 129
Full-Text Articles in Engineering
A Novel 3d Simulation Model For Investigating Liquid Desiccant Dehumidification Performance Based On Cfd Technology., Tao Wen, Yimo Luo, Lu Lin
A Novel 3d Simulation Model For Investigating Liquid Desiccant Dehumidification Performance Based On Cfd Technology., Tao Wen, Yimo Luo, Lu Lin
Faculty of Science & Technology (THEi)
Previous 2D CFD simulation models fail to elaborate the actual simultaneous flow and dehumidification process in liquid desiccant cooling system. Accordingly, the present study successfully developed a novel 3D simulation model for investigating the liquid desiccant dehumidification performance of a falling film dehumidifier. The penetration mass transfer model was implemented in the simulation to account for the interfacial dehumidification process. Experimental system was built for the model validation and the results indicated that the newly developed 3D CFD model could predict the absolute moisture removal accurately with an average deviation of 7%. Parametric study revealed that the dehumidification performance was …
Flexible Integration Of Liquid Air Energy Storage With Liquefied Natural Gas Regasification For Power Generation Enhancement, Xiaohui She, Tongtong Zhang, Lin Cong, Xiaodong Peng, Chuan Li, Yimo Luo, Yulong Ding
Flexible Integration Of Liquid Air Energy Storage With Liquefied Natural Gas Regasification For Power Generation Enhancement, Xiaohui She, Tongtong Zhang, Lin Cong, Xiaodong Peng, Chuan Li, Yimo Luo, Yulong Ding
Faculty of Science & Technology (THEi)
Liquid Air Energy Storage (LAES) is one of the most promising energy storage technologies for achieving low carbon emissions. Our research shows that the LAES produces a considerable amount of excess heat that cannot be cost-effectively utilised in a standalone LAES system. On the other hand, the regasification of liquefied natural gas (LNG) often leads to waste of a large amount of high-grade cold energy. Therefore, this paper proposes the integration of the LAES with the LNG regasification process via a Brayton cycle (denoted as LAES-Brayton-LNG), where pressurized propane is used as both the heat transfer fluid and storage material …
A Review Of Renewable Energy Assessment Methods In Green Building And Green Neighborhood Rating Systems, Chong Zhang, Chengliao Cui, Ying Zhang, Jiaqi Yuan, Yimo Luo, Wenjie Gang
A Review Of Renewable Energy Assessment Methods In Green Building And Green Neighborhood Rating Systems, Chong Zhang, Chengliao Cui, Ying Zhang, Jiaqi Yuan, Yimo Luo, Wenjie Gang
Faculty of Science & Technology (THEi)
Green buildings and neighborhoods can help mitigate impacts of buildings on the environment, society and economy. Many rating systems or tools have been developed worldwide to assess and certificate green buildings or green neighborhoods. Renewable energy plays an important role in achieving green buildings/neighborhoods or zero energy buildings/neighborhoods by reducing fuel consumption and pollution emissions. However, substantial differences exist in assessing or quantifying the renewable energy in green building/neighborhood rating systems. This paper therefore provides a comprehensive review on renewable energy assessment methods adopted in green building/neighborhood rating systems, which would be very helpful to understand and then improve the …
Study On The Performance Of Distributed Energy Systems Based On Historical Loads Considering Parameter Uncertainties For Decision Making., Chong Zhang, Xue Xue, Qianzhou Du, Yimo Luo, Wenjie Gang
Study On The Performance Of Distributed Energy Systems Based On Historical Loads Considering Parameter Uncertainties For Decision Making., Chong Zhang, Xue Xue, Qianzhou Du, Yimo Luo, Wenjie Gang
Faculty of Science & Technology (THEi)
Distributed energy systems (DESs) are becoming increasingly popular because of their high-energy efficiency and low pollution emissions. Accurate performance evaluation of such systems is critical for processes at the early design stages. However, there are considerable uncertainties in terms of the parameters used for performance evaluation and design optimization, including component efficiencies, customer demands, and energy markets. These uncertainties can significantly influence the performance of DESs. Without consideration of these uncertainties, the performance of DESs can be overestimated or underestimated, which leads to inaccurate decision-making. Therefore, this paper presents a comprehensive evaluation of the performance of DESs by considering uncertainties …
Impact Of Potential Engine Malfunctions On Fuel Consumption And Gaseous Emissions Of A Euro Vi Diesel Truck., Yuhan Huang, Elvin C.Y. Ng, Yat-Shing Yam, Casey K.C. Lee, Surawski C. Nic, Wai-Chuen Mok, Organ Bruce, John L. Zhou, Edward F.C. Chan
Impact Of Potential Engine Malfunctions On Fuel Consumption And Gaseous Emissions Of A Euro Vi Diesel Truck., Yuhan Huang, Elvin C.Y. Ng, Yat-Shing Yam, Casey K.C. Lee, Surawski C. Nic, Wai-Chuen Mok, Organ Bruce, John L. Zhou, Edward F.C. Chan
Faculty of Science & Technology (THEi)
Although new vehicles are designed to comply with specific emission regulations, their in-service performance would not necessarily achieve them due to wear-and-tear and improper maintenance, as well as tampering or failure of engine control and exhaust after-treatment systems. In addition, there is a lack of knowledge on how significantly these potential malfunctions affect vehicle performance. This study was therefore conducted to simulate the effect of various engine malfunctions on the fuel consumption and gaseous emissions of a 16-tonne Euro VI diesel truck using transient chassis dynamometer testing. The simulated malfunctions included those that would commonly occur in the intake, fuel …
Nimoal Catalysts Derived From Heptamolybdate-Intercalated Layered Double Hydroxides For Hydrodeoxygenation Of Anisole, Chuang Li, Xingzhao Zhang, Xiao Chen, Zhijian Peng, Chi-Wing Tsang, Changhai Liang
Nimoal Catalysts Derived From Heptamolybdate-Intercalated Layered Double Hydroxides For Hydrodeoxygenation Of Anisole, Chuang Li, Xingzhao Zhang, Xiao Chen, Zhijian Peng, Chi-Wing Tsang, Changhai Liang
Faculty of Science & Technology (THEi)
The catalytic performance of NiMoAl catalysts derived from layered double hydroxide (LDH) precursors with molybdenum species incorporated into the interlayers was investigated for the hydrodeoxygenation (HDO) of anisole as a model compound of the lignin. The results showed that high dispersion of small Ni nanoparticles with 2–5 nm due to the pinning effect of Mo from Mo7O246− intercalated the LDHs. Due to presence of the oxygen vacancy sites on the molybdenum oxide, the NiMoAl catalysts exhibit higher conversion of anisole than the corresponding NiAl catalyst. The activity for hydrodeoxygenation was enhanced with the increased content of molybdenum species, which can …
Nb(Ta)-Based Solid Acid Modified Pt/Cnts Catalysts For Hydrodeoxygenation Of Lignin-Derived Compounds, Weixiang Guan, Xiao Chen, Chuang Li, Jie Zhang, Chi-Wing Tsang, Haoquan Hu, Shaojie Li, Changhai Liang
Nb(Ta)-Based Solid Acid Modified Pt/Cnts Catalysts For Hydrodeoxygenation Of Lignin-Derived Compounds, Weixiang Guan, Xiao Chen, Chuang Li, Jie Zhang, Chi-Wing Tsang, Haoquan Hu, Shaojie Li, Changhai Liang
Faculty of Science & Technology (THEi)
Efficient upgrading of lignin bio-oils into oxygen-free liquid alkane fuels is a challenging task owing to the incompatibility of the phenolic feedstock with conventional fuels and the availability of effective hydrotreating catalysts based on the current refinery infrastructure. In this work, a series of solid acid nanosheets (HNbWO6, HNbMoO6, HTaWO6) modified Pt/CNTs bifunctional catalysts were evaluated in hydrodeoxygenation (HDO) of lignin-derived compounds. The effects of types of nanosheets and the synergistic effect between metal sites and acid sites were discussed via HDO of diphenyl ether. Pt/HNbWO6/CNTs catalyst exhibited the most efficient performance for the HDO of diphenyl ether to cyclohexane …
Thermal Properties Study And Performance Investigation Of Potassium Formate Solution In A Falling Film Dehumidifier/Regenerator., Tao Wen, Meng Wang, Yi Chen, Weifeng He, Yimo Luo
Thermal Properties Study And Performance Investigation Of Potassium Formate Solution In A Falling Film Dehumidifier/Regenerator., Tao Wen, Meng Wang, Yi Chen, Weifeng He, Yimo Luo
Faculty of Science & Technology (THEi)
Compared with the extensive attention drawn by salt solutions, the promising potassium formate (KCOOH) solution which has smaller causticity and lower price receives little attention in the field of liquid desiccant cooling system (LDCS). Consequently, the present paper studied both the thermal properties and mass transfer performance of KCOOH solution for its practical engineering application. The vapor pressure and density of KCOOH solution under different concentrations and temperatures were measured and then fitted in the form of polynomials with the mean absolute relative deviation (MARD) of 0.06% and 0.551% respectively. Referring to the data in the existing literature, the heat …
Effect Of Limited Tension Stiffening In Rc Elements Under Cyclic Loads., Xueying Wang, Jun Shang Kuang
Effect Of Limited Tension Stiffening In Rc Elements Under Cyclic Loads., Xueying Wang, Jun Shang Kuang
Faculty of Science & Technology (THEi)
The tension capacity in cracked concrete is not well defined in existing shear models for reinforced concrete (RC) membrane elements under cyclic reversed loading, and the shear strength of RC elements is consequently overestimated due to the deviated decreasing branch of envelope of cyclic tensile stress-strain relationship. In this paper, the cyclic effect of limited tension stiffening of cracked RC elements is evaluated by proposing an analytical model named as the cyclic tension-stiffening fixed-angle truss model (CTFTM). The proposed model, based on fixed-angle theory, integrates unloading and reloading rules and accumulated damage into the limited tension-stiffening effect under cyclic loading …