This page has only limited features, please log in for full access.
The aim of this study is to clarify the effect of doped metal type on CO2 reduction characteristics of TiO2 with NH3 and H2O. Cu and Pd have been selected as dopants for TiO2. In addition, the impact of molar ratio of CO2 to reductants NH3 and H2O has been investigated. A TiO2 photocatalyst was prepared by a sol-gel and dip-coating process, and then doped with Cu or Pd fine particles by using the pulse arc plasma gun method. The prepared Cu/TiO2 film and Pd/TiO2 film were characterized by SEM, EPMA, TEM, STEM, EDX, EDS and EELS. This study also has investigated the performance of CO2 reduction under the illumination condition of Xe lamp with or without ultraviolet (UV) light. As a result, it is revealed that the CO2 reduction performance with Cu/TiO2 under the illumination condition of Xe lamp with UV light is the highest when the molar ratio of CO2/NH3/H2O = 1:1:1 while that without UV light is the highest when the molar ratio of CO2/NH3/H2O = 1:0.5:0.5. It is revealed that the CO2 reduction performance of Pd/TiO2 is the highest for the molar ratio of CO2/NH3/H2O = 1:1:1 no matter the used Xe lamp was with or without UV light. The molar quantity of CO per unit weight of photocatalyst for Cu/TiO2 produced under the illumination condition of Xe lamp with UV light was 10.2 μmol/g, while that for Pd/TiO2 was 5.5 μmol/g. Meanwhile, the molar quantity of CO per unit weight of photocatalyst for Cu/TiO2 produced under the illumination condition of Xe lamp without UV light was 2.5 μmol/g, while that for Pd/TiO2 was 3.5 μmol/g. This study has concluded that Cu/TiO2 is superior to Pd/TiO2 from the viewpoint of the molar quantity of CO per unit weight of photocatalyst as well as the quantum efficiency.
Akira Nishimura; Ryouga Shimada; Yoshito Sakakibara; Akira Koshio; Eric Hu. Comparison of CO2 Reduction Performance with NH3 and H2O between Cu/TiO2 and Pd/TiO2. Molecules 2021, 26, 2904 .
AMA StyleAkira Nishimura, Ryouga Shimada, Yoshito Sakakibara, Akira Koshio, Eric Hu. Comparison of CO2 Reduction Performance with NH3 and H2O between Cu/TiO2 and Pd/TiO2. Molecules. 2021; 26 (10):2904.
Chicago/Turabian StyleAkira Nishimura; Ryouga Shimada; Yoshito Sakakibara; Akira Koshio; Eric Hu. 2021. "Comparison of CO2 Reduction Performance with NH3 and H2O between Cu/TiO2 and Pd/TiO2." Molecules 26, no. 10: 2904.
This study has investigated the impact of molar ratio of CO2 to reductants NH3 and H2O as well as that of Cu loading on CO2 reduction characteristics over Cu/TiO2. No study to optimize the reductants’ combination and Cu loading weight in order to enhance CO2 reduction performance of TiO2 has been investigated yet. This study prepared Cu/TiO2 film by loading Cu particles during the pulse arc plasma gun process after coating TiO2 film by the sol-gel and dip-coating process. As to loading weight of Cu, it was regulated by change in the pulse number. This study characterized the prepared Cu/TiO2 film by SEM and EPMA. Additionally, the performance of CO2 reduction has been investigated under the illumination condition of Xe lamp with or without ultraviolet (UV) light. It is revealed that the molar ratio of CO2/NH3/H2O is optimized according to the pulse number. Since the amount of H+ which is the same as that of electron is needed to produce CO decided following the theoretical CO2 reduction reacting with H2O or NH3, larger H+ is needed with the increase in the pulse number. It is revealed that Cu of 4.57 wt% for the pulse number of 200 is the optimum condition, whereas the molar quantity of CO per unit weight of Cu/TiO2 with and without UV light illumination is 34.1 mol/g and 12.0 mol/g, respectively.
Akira Nishimura; Yoshito Sakakibara; Akira Koshio; Eric Hu. The Impact of Amount of Cu on CO2 Reduction Performance of Cu/TiO2 with NH3 and H2O. Catalysts 2021, 11, 610 .
AMA StyleAkira Nishimura, Yoshito Sakakibara, Akira Koshio, Eric Hu. The Impact of Amount of Cu on CO2 Reduction Performance of Cu/TiO2 with NH3 and H2O. Catalysts. 2021; 11 (5):610.
Chicago/Turabian StyleAkira Nishimura; Yoshito Sakakibara; Akira Koshio; Eric Hu. 2021. "The Impact of Amount of Cu on CO2 Reduction Performance of Cu/TiO2 with NH3 and H2O." Catalysts 11, no. 5: 610.
Performance and economics of a solar-assisted combined cooling, heating and power (SCCHP) system mainly depend on the system’s structure, operation strategy and choice of facility capacity. The SCCHP analyzed in this paper, contains a solid oxide fuel cell (SOFC) that is the power generation unit, a heat recovery system, a photovoltaic (PV) system, solar evacuated tube collectors (ETC), an absorption chiller, an electric chiller and a heat storage tank. An improved operation strategy, termed as best operation condition point (BOCP) strategy, is proposed and applied in this SCCHP system. With the proposed operation strategy, the capacities of the main equipment are optimized based on a particle swarm optimization (PSO) algorithm. In addition, a case study of an apartment building in Guangzhou is conducted to verify the feasibility of the proposed SCCHP system structure and optimal operation strategy. Compared with these separating supply system, the optimized CCHP system has an excellent performance in energy saving. It can save 15141.63 KWh electric energy and increase heat output by 170183.57 MJ per year. Accordingly, the return on investment is 2.55 and the payback period is 11.2 years.
Hongjuan Hou; Jiwen Wu; Zeyu Ding; Bo Yang; Eric Hu. Performance analysis of a solar-assisted combined cooling, heating and power system with an improved operation strategy. Energy 2021, 227, 120516 .
AMA StyleHongjuan Hou, Jiwen Wu, Zeyu Ding, Bo Yang, Eric Hu. Performance analysis of a solar-assisted combined cooling, heating and power system with an improved operation strategy. Energy. 2021; 227 ():120516.
Chicago/Turabian StyleHongjuan Hou; Jiwen Wu; Zeyu Ding; Bo Yang; Eric Hu. 2021. "Performance analysis of a solar-assisted combined cooling, heating and power system with an improved operation strategy." Energy 227, no. : 120516.
The oil shale in-situ recovery requires huge thermal energy, which has become one of the important factors restricting its further development. Using solar thermal energy for oil shale in-situ recovery is thought to be an environmental friendly way to solve the problem. In this paper, an in-situ solar thermal shale oil recovery system with rated output power of 100 MW is analyzed as a study case to understand its cost-effectiveness. The correlation between oil shale production cost (PC) and the solar multiple (SM), the thermal energy storage (TES) capacity and the distance between injection well and production well (Dw) is studied. The result shows that, when the SM is 2.5, TES capacity is 16 h, and Dw is 20 m, the PC of oil shale in-situ recovery with solar intermittent heating mode is the lowest, which is 306 $/t and is even lower than that with continuous heating mode by natural gas and natural gas-assisted solar energy. Besides, the sensitivity analysis shows that the cost of O&M has the biggest effect on the PC. However, due to the high initial cost of the solar field, when the discount rate is above 8.23%, oil shale in-situ recovery by solar energy intermittent heating is uneconomical.
Hongjuan Hou; Qiongjie Du; Chang Huang; Le Zhang; Eric Hu. An oil shale recovery system powered by solar thermal energy. Energy 2021, 225, 120096 .
AMA StyleHongjuan Hou, Qiongjie Du, Chang Huang, Le Zhang, Eric Hu. An oil shale recovery system powered by solar thermal energy. Energy. 2021; 225 ():120096.
Chicago/Turabian StyleHongjuan Hou; Qiongjie Du; Chang Huang; Le Zhang; Eric Hu. 2021. "An oil shale recovery system powered by solar thermal energy." Energy 225, no. : 120096.
Geothermal heat exchangers (GHEs) represent a buried pipe system, which can be utilised to harness renewable thermal energy stored in the ground to improve the efficiency of heating and cooling systems. Two basic arrangements of GHEs have been widely used: vertical and horizontal. Vertical GHEs generally have a better performance in comparison with the horizontal arrangement, and these systems are particularly suitable for confined spaces. Nevertheless, the main technical challenge associated with GHEs, for either the vertical or the horizontal arrangement, is the performance deterioration associated with an increase in the operation times during summer or winter seasons. In this paper, a combined horizontal-vertical GHE arrangement is proposed to address the current challenges. The combined GHE arrangement can be operated in five different modes, corresponding to different thermal loading conditions. These five operation modes of the combined GHE are analysed based on the transient finite difference models previously developed for the horizontal and vertical arrangements. The simulation results reveal that for the single operation mode (horizontal or vertical only), the vertical GHE performs better than the horizontal GHE due to relatively stable ground temperature deep down. While, for the combined operation mode, the series operations (horizontal to vertical or vertical to horizontal) of the GHE are superior to the split mode. It is found that the effect of the fluid mass flow rate ratio is trivial on the heat dissipation of the split mode GHE. The highest heat transfer rate in the split flow operational mode is rendered by the ratio of the mass flow rate of 40% horizontal and 60% vertical. In addition, the climate condition has more effect on GHE’s performance and the increase of the fluid flow rate it can enhance the amount of energy released by the GHE.
Sarwo Edhy Sofyan; Eric Hu; Andrei Kotousov; Teuku Meurah Indra Riayatsyah; Razali Thaib. Mathematical Modelling and Operational Analysis of Combined Vertical–Horizontal Heat Exchanger for Shallow Geothermal Energy Application in Cooling Mode. Energies 2020, 13, 6598 .
AMA StyleSarwo Edhy Sofyan, Eric Hu, Andrei Kotousov, Teuku Meurah Indra Riayatsyah, Razali Thaib. Mathematical Modelling and Operational Analysis of Combined Vertical–Horizontal Heat Exchanger for Shallow Geothermal Energy Application in Cooling Mode. Energies. 2020; 13 (24):6598.
Chicago/Turabian StyleSarwo Edhy Sofyan; Eric Hu; Andrei Kotousov; Teuku Meurah Indra Riayatsyah; Razali Thaib. 2020. "Mathematical Modelling and Operational Analysis of Combined Vertical–Horizontal Heat Exchanger for Shallow Geothermal Energy Application in Cooling Mode." Energies 13, no. 24: 6598.
The purpose of this paper is to present a technique for burst detection, localization, and cross-sectional area quantification based on the damping of fluid transients. The Fourier components of the transient signal are damped differently due to the presence of the burst and the unsteady friction it causes. An unsteady friction water hammer (UFWH) model has been developed and validated to determine the unsteady friction damping. The burst damping can then be calculated, and this both indicates the presence of the burst and contains information about the burst location and the associated cross-sectional area. The corresponding numerical studies and experimental results are presented in this paper. By applying the technique outlined in this paper, the errors of the resultant burst location from the numerical and experimental analyses are 1%–1.5% and 1.57%–4.05%, respectively.
Xiao-Xuan Du; Martin F. Lambert; Lei Chen; Eric Jing Hu; Wang Xi. Pipe Burst Detection, Localization, and Quantification Using the Transient Pressure Damping Method. Journal of Hydraulic Engineering 2020, 146, 04020077 .
AMA StyleXiao-Xuan Du, Martin F. Lambert, Lei Chen, Eric Jing Hu, Wang Xi. Pipe Burst Detection, Localization, and Quantification Using the Transient Pressure Damping Method. Journal of Hydraulic Engineering. 2020; 146 (11):04020077.
Chicago/Turabian StyleXiao-Xuan Du; Martin F. Lambert; Lei Chen; Eric Jing Hu; Wang Xi. 2020. "Pipe Burst Detection, Localization, and Quantification Using the Transient Pressure Damping Method." Journal of Hydraulic Engineering 146, no. 11: 04020077.
When simulating a daily performance of a solar thermal powered adsorption refrigeration system, daily weather data (i.e. daily maximum and minimum ambient temperatures and daily total solar radiation) are normally used to simulate a 24-h refrigeration cycle. However, the simulation obtained in this way is not that accurate, due to which could not reflect real hourly processes during the daytime. In present study, hourly weather data, especially during the isosteric and desorption processes in the sunshine duration, has been utilised to simulate hourly accumulated daily cycles. Seven possible cycles, depending on hourly weather change patterns, have been identified in this study. It has been found that the desorption process is not necessarily an isobar process as previous studies assumed, which depends on real hourly weather changes. Therefore, an improved mathematical model has been developed and validated. It has been found that the accuracy of the simulation with hourly weather data has been improved by up to 5%, compared to that of the model using daily weather data. The simulated error in one-day performance would be accumulated if a long-time performance of such a system was required to be simulated. Therefore, a case-study is conducted to demonstrate the difference between the two models when simulating a daily performance under three typical weather conditions.
Ji Wang; Eric Hu; Antoni Blazewicz; Akram W. Ezzat. Investigation on the long-term performance of solar thermal powered adsorption refrigeration system based on hourly accumulated daily cycles. Heat and Mass Transfer 2020, 57, 361 -375.
AMA StyleJi Wang, Eric Hu, Antoni Blazewicz, Akram W. Ezzat. Investigation on the long-term performance of solar thermal powered adsorption refrigeration system based on hourly accumulated daily cycles. Heat and Mass Transfer. 2020; 57 (2):361-375.
Chicago/Turabian StyleJi Wang; Eric Hu; Antoni Blazewicz; Akram W. Ezzat. 2020. "Investigation on the long-term performance of solar thermal powered adsorption refrigeration system based on hourly accumulated daily cycles." Heat and Mass Transfer 57, no. 2: 361-375.
The impact of micro porous layer (MPL) with various thicknesses of polymer electrolyte membrane (PEM) on heat and mass transfer characteristics, as well as power generation performance of Polymer Electrolyte Fuel Cell (PEFC), is investigated. The in-plane temperature distribution on cathode separator back is also measured by thermocamera. It has been found that the power generation performance is improved by the addition of MPL, especially at higher current density condition irrespective of initial temperature of cell (Tini) and relative humidity condition. However, the improvement is not obvious when the thin PEM (Nafion NRE-211; thickness of 25 μm) is used. The increase in temperature from inlet to outlet without MPL is large compared to that with MPL when using thick PEM, while the difference between without MPL and with MPL is small when using thin PEM. It has been confirmed that the addition of MPL is effective for the improvement of power generation performance of single PEFC operated at higher temperatures than normal. However, the in-plane temperature distribution with MPL is not even.
Akira Nishimura; Tatsuya Okado; Yuya Kojima; Masafumi Hirota; Eric Hu. Impact of MPL on Temperature Distribution in Single Polymer Electrolyte Fuel Cell with Various Thicknesses of Polymer Electrolyte Membrane. Energies 2020, 13, 2499 .
AMA StyleAkira Nishimura, Tatsuya Okado, Yuya Kojima, Masafumi Hirota, Eric Hu. Impact of MPL on Temperature Distribution in Single Polymer Electrolyte Fuel Cell with Various Thicknesses of Polymer Electrolyte Membrane. Energies. 2020; 13 (10):2499.
Chicago/Turabian StyleAkira Nishimura; Tatsuya Okado; Yuya Kojima; Masafumi Hirota; Eric Hu. 2020. "Impact of MPL on Temperature Distribution in Single Polymer Electrolyte Fuel Cell with Various Thicknesses of Polymer Electrolyte Membrane." Energies 13, no. 10: 2499.
Akira Nishimura; Satoshi Ohata; Kaito Okukura; Eric Hu. The Impact of Operating Conditions on the Performance of a CH4 Dry Reforming Membrane Reactor for H2 Production. Journal of Energy and Power Technology 2020, 2, 1 -19.
AMA StyleAkira Nishimura, Satoshi Ohata, Kaito Okukura, Eric Hu. The Impact of Operating Conditions on the Performance of a CH4 Dry Reforming Membrane Reactor for H2 Production. Journal of Energy and Power Technology. 2020; 2 (2):1-19.
Chicago/Turabian StyleAkira Nishimura; Satoshi Ohata; Kaito Okukura; Eric Hu. 2020. "The Impact of Operating Conditions on the Performance of a CH4 Dry Reforming Membrane Reactor for H2 Production." Journal of Energy and Power Technology 2, no. 2: 1-19.
This study investigated the impact of molar ratio of CO2 to reductants H2O and H2, as well as Pd loading weight on CO2 reduction performance with Pd/TiO2 as the photocatalyst. The Pd/TiO2 film photocatalyst is prepared by the sol-gel and dip-coating process to prepare TiO2 film and the pulse arc plasma method is used to dope Pd on TiO2 film. The prepared Pd/TiO2 film was characterized by SEM, EPMA, STEM, EDS, and EELS. This study also investigated the performance of CO2 reduction under the illumination condition of Xe lamp with or without ultraviolet (UV) light. As a result, it is revealed that when the molar ratio of CO2/H2/H2O is set at 1:0.5:0.5, the best CO2 reduction performance has been obtained under the illumination condition of Xe lamp with and without UV light. In addition, it is found that the optimum Pd loading weight is 3.90 wt%. The maximum molar quantities of CO and CH4 produced per unit weight of photocatalyst are 30.3 μmol/g and 22.1 μmol/g, respectively, for the molar ratio of CO2/H2/H2O = 1:0.5:0.5 under the condition of Xe lamp illumination with UV light. With UV light, C2H4 and C2H6, as well as CO and CH4 are also produced by the Pd/TiO2 film photocatalyst prepared in this study.
Akira Nishimura; Tadaaki Inoue; Yoshito Sakakibara; Masafumi Hirota; Akira Koshio; Eric Hu. Impact of Pd Loading on CO2 Reduction Performance over Pd/TiO2 with H2 and H2O. Molecules 2020, 25, 1468 .
AMA StyleAkira Nishimura, Tadaaki Inoue, Yoshito Sakakibara, Masafumi Hirota, Akira Koshio, Eric Hu. Impact of Pd Loading on CO2 Reduction Performance over Pd/TiO2 with H2 and H2O. Molecules. 2020; 25 (6):1468.
Chicago/Turabian StyleAkira Nishimura; Tadaaki Inoue; Yoshito Sakakibara; Masafumi Hirota; Akira Koshio; Eric Hu. 2020. "Impact of Pd Loading on CO2 Reduction Performance over Pd/TiO2 with H2 and H2O." Molecules 25, no. 6: 1468.
Only one analytical model was previously proposed for multi-stage M-cycle cooler which is based on Sprayed-Water Theory in which the temperature of the wet plate was assumed constant, equal to water inlet temperature, (as the water flow rate was assumed so high). Said preliminary model was only able to predict outlet characteristics of the cooler (not parameters distribution along the cooler). This paper presents a new model for multi-stage M-cycle cooler based on the novel Wet-Surface theory in which the temperature of the wet-plate varies along the cooler (real working condition) and the model is able to generate the temperature/humidity distribution in addition to the outlet characteristics. The concept of the novel Wet-Surface theory and its potentials are discussed in the paper. Maximum theoretic cooling capacity of a given M-cycle cooler is obtained when it works based on Wet-Surface Theory. The model is experimentally validated with a unique test-rig and then the impacts of key operation and design parameters of multi-stage M-cycle cooler (i.e. inlet temperature, humidity ratio, mass flow rate, mass flow ratio, channel gap, channel length, channel height and the location of perforation) on its cooling characteristics (including outlet temperatures, outlet humidity ratio, wet-bulb effectiveness and dew-point effectiveness) are studied by the validated model.
Hamed Sadighi Dizaji; Eric Jing Hu; Lei Chen; Samira Pourhedayat. Analytical/experimental sensitivity study of key design and operational parameters of perforated Maisotsenko cooler based on novel wet-surface theory. Applied Energy 2020, 262, 114557 .
AMA StyleHamed Sadighi Dizaji, Eric Jing Hu, Lei Chen, Samira Pourhedayat. Analytical/experimental sensitivity study of key design and operational parameters of perforated Maisotsenko cooler based on novel wet-surface theory. Applied Energy. 2020; 262 ():114557.
Chicago/Turabian StyleHamed Sadighi Dizaji; Eric Jing Hu; Lei Chen; Samira Pourhedayat. 2020. "Analytical/experimental sensitivity study of key design and operational parameters of perforated Maisotsenko cooler based on novel wet-surface theory." Applied Energy 262, no. : 114557.
In this research a two-degrees-of-freedom (2-DOF) virtual stiffness-damping system (VSDS) is developed to facilitate industrial and laboratory testing of airfoil aeroelasticity instability. Other existing test-beds in this field rely on elastic elements or structures to set airfoil elasticity in tests, which can be costly and inconvenient in cases of frequent stiffness adjustment across a wide range. A possible alternative is the VSDS that utilizes electric drives to simulate structural elasticity and damping, as seen in marine and bio-mechanical engineering, which however, cannot be directly applied to airfoil aeroelasticity testing (AAT) due to operation requirements and conditions being different. Therefore, in this study a new VSDS is developed specifically for AAT. Firstly, the concept of 1-DOF VSDS is extended to 2 DOFs, with the dynamics coupling between each DOF addressed at the stage of operation principle determination, by the proposed direct force/torque regulation with force/torque feedback. Secondly, resolution loss in position/velocity measurement is identified as a main problem associated with the non-reduction transmission required, and is solved by a modified extended-state observer (MESO) proposed for fast position/velocity estimation. Thirdly, system identification and calibration procedures involved in developing the new VSDS are reduced to minimum through a robust force/torque tracking controller design, with detailed numerical study on parametric analysis given. As validated in wind-tunnel experiments the new VSDS can closely track the desired force/torque and provide satisfactory virtual stiffness and damping in AAT.
Difan Tang; Lei Chen; Zhao Feng Tian; Eric Hu. Developing a virtual stiffness-damping system for airfoil aeroelasticity testing. Journal of Sound and Vibration 2019, 468, 115061 .
AMA StyleDifan Tang, Lei Chen, Zhao Feng Tian, Eric Hu. Developing a virtual stiffness-damping system for airfoil aeroelasticity testing. Journal of Sound and Vibration. 2019; 468 ():115061.
Chicago/Turabian StyleDifan Tang; Lei Chen; Zhao Feng Tian; Eric Hu. 2019. "Developing a virtual stiffness-damping system for airfoil aeroelasticity testing." Journal of Sound and Vibration 468, no. : 115061.
Solar Aided Power Generation (SAPG) is the most efficient and economic ways to hybridise solar thermal energy and a fossil fuel fired regenerative Rankine cycle (RRC) power plant for power generation purpose. In such an SAPG plant, the solar thermal energy is used to displace the extraction steam by preheating the feedwater to the boiler. The displaced/saved extraction steam can, therefore, expand further in the steam turbine to generate power. The research and development of the SAPG technology started in the 1990s. This paper is trying to reviews and summarises the progress of research and development of the SAPG plant technology in last almost 30 or so years, including the technical and economic advantages of SAPG over other solar thermal power generation technologies (e.g. solar alone power generation), various modelling techniques used to simulate SAPG perforamnce, impacts of SAPG plant's configuration, size of solar field and strategies to adjust mass flow rate of extraction steam on the plant perforamnce, exergy analysis of SAPG plant and operation strategies to maximise plant's economic returns etc. In addition, the directions for future R& D about SAPG technology have been pointed/proposed in this paper.
Jiyun Qin; Eric Hu; Xiaohua Li. Solar aided power generation: A review. Energy and Built Environment 2019, 1, 11 -26.
AMA StyleJiyun Qin, Eric Hu, Xiaohua Li. Solar aided power generation: A review. Energy and Built Environment. 2019; 1 (1):11-26.
Chicago/Turabian StyleJiyun Qin; Eric Hu; Xiaohua Li. 2019. "Solar aided power generation: A review." Energy and Built Environment 1, no. 1: 11-26.
Performance reduction of gas turbine power plants during the hot seasons has persuaded the specialists to propose different inlet air temperature reducer techniques. Accessible free heat at the exhaust of the turbine justifies the absorption chiller as a potential solution. However, based on the evaluations of present research, almost for all climate conditions a huge capacity/size/number of absorption chillers are required to reach the ISO condition (15 °C and RH 100% which is the design point of gas turbine) which means considerable amount of initial, operating and maintenance cost. As the M-cycle cooler (which has very simpler structure and lower costs) is able to reduce the air temperature toward the dew point temperature without adding any moisture, present research proposes an integrated cycle of M-cycle and absorption chiller (which notably reduces the whole cost of the cooling process) for said aim. In present novel cycle, the air is precooled by M-cycle toward its dew point temperature before entering to the absorption chiller which significantly reduces the required capacity of absorption chiller for the rest of the cooling process. The most amazing feature of the integrated cycle is that the condensed water from the air during the cooling process by absorption chiller can be employed as the M-cycle water consumption. For some climate conditions, M-cycle is able to provide ISO condition (or colder temperatures) without the requirement of absorption chiller. Many other outstanding results are obtained which can be used in real industrial applications.
Hamed Sadighi Dizaji; Eric Jing Hu; Lei Chen; Samira Pourhedayat. Using novel integrated Maisotsenko cooler and absorption chiller for cooling of gas turbine inlet air. Energy Conversion and Management 2019, 195, 1067 -1078.
AMA StyleHamed Sadighi Dizaji, Eric Jing Hu, Lei Chen, Samira Pourhedayat. Using novel integrated Maisotsenko cooler and absorption chiller for cooling of gas turbine inlet air. Energy Conversion and Management. 2019; 195 ():1067-1078.
Chicago/Turabian StyleHamed Sadighi Dizaji; Eric Jing Hu; Lei Chen; Samira Pourhedayat. 2019. "Using novel integrated Maisotsenko cooler and absorption chiller for cooling of gas turbine inlet air." Energy Conversion and Management 195, no. : 1067-1078.
Great achievements have been made in the researches of thermal characteristics of Maisotsenko air cooler. However, a clear gap is still in existence on exergetic behaviour of M-cycle coolers. The significance of exergy analysis of M-cycle air coolers is highlighted when they were employed as a temperature reducer of intake air of gas-turbines in power plants to improve the efficiency of the system. Obviously, economic analysis of any thermodynamic system underlines the exergetic evaluations of the whole parts of the system which has been resulted in the emergence of professional expressions such as “exergoeconomic” and “thermoeconomic”. This paper reports a comprehensive exergetic formulation and analysis of regenerative M-cycle air cooler which can be employed in air conditioning industry and other applications of M-cycle cooler for better decision making. Higher inlet air mass flow rate, inlet air temperature and air flow ratio between two channels caused further exergy destruction. Exergetic efficiency of humid air is found more than the exergetic efficiency of dry air in M-cycle coolers. In order to prevent the severe exergy destruction through the cooler, the air velocity along the channels should not have large value. It is noted that, in the same total inlet air flow rate, the air velocity along the channels can be controlled by the numbers of the employed parallel plates in the designing process of M-cycle based on the second law of thermodynamics.
Hamed Sadighi Dizaji; Eric Jing Hu; Lei Chen; Samira Pourhedayat. Comprehensive exergetic study of regenerative Maisotsenko air cooler; formulation and sensitivity analysis. Applied Thermal Engineering 2019, 152, 455 -467.
AMA StyleHamed Sadighi Dizaji, Eric Jing Hu, Lei Chen, Samira Pourhedayat. Comprehensive exergetic study of regenerative Maisotsenko air cooler; formulation and sensitivity analysis. Applied Thermal Engineering. 2019; 152 ():455-467.
Chicago/Turabian StyleHamed Sadighi Dizaji; Eric Jing Hu; Lei Chen; Samira Pourhedayat. 2019. "Comprehensive exergetic study of regenerative Maisotsenko air cooler; formulation and sensitivity analysis." Applied Thermal Engineering 152, no. : 455-467.
Accumulated performance of an activated carbon/methanol adsorption refrigeration system driven by solar thermal energy, has been studied under various climate conditions. The previous studies mainly focus on the individual daily cycle with the assumption that the system restores back to its original point every day, regardless of a real climate condition. In reality, for such a refrigeration system, its daily performance would depend not only on the current day’s weather conditions, but also on the previous day’s situation, i.e. the current day cycle starts from where the previous day cycle ends, which is not necessarily the starting point of the previous day. There might be some leftover liquid at the end of a particular day, depending on the weather conditions during the night. A new configuration, which can accumulate the cooling capacity without removing ice daily, has been established. Possible cycles of such a system have been identified with consideration of realistic daily climate conditions. A desktop case-study was conducted to demonstrate the difference in the simulation of accumulated performance by two models, with the ideal assumption and real daily weather data respectively. The ice-making performance and COPs simulated by two models have been compared and evaluated in this study.
Ji Wang; Eric Hu; Antoni Blazewicz; Akram W. Ezzat. Simulation of accumulated performance of a solar thermal powered adsorption refrigeration system with daily climate conditions. Energy 2018, 165, 487 -498.
AMA StyleJi Wang, Eric Hu, Antoni Blazewicz, Akram W. Ezzat. Simulation of accumulated performance of a solar thermal powered adsorption refrigeration system with daily climate conditions. Energy. 2018; 165 ():487-498.
Chicago/Turabian StyleJi Wang; Eric Hu; Antoni Blazewicz; Akram W. Ezzat. 2018. "Simulation of accumulated performance of a solar thermal powered adsorption refrigeration system with daily climate conditions." Energy 165, no. : 487-498.
Maisotsenko cycle based coolers are able to reduce the air temperature below the wet-bulb temperature of the inlet air without adding any moisture to the product air and without the use of any compressor or refrigerant (CFC). These positive features of M-cycle have encouraged the researchers to enthusiastically consider the thermal-fluid characteristics of M-cycle cooler via numerical, analytical and experimental techniques. In this paper attempts are made to present an analytical solution for thermal behavior of perforated (multi-stage) regenerative M-cycle exchanger which has not been carried out before. Indeed, all previous analytical solutions of M-cycle have been provided for the simplest structure of M-cycle exchanger (single-stage, without perforation) and the perforated M-cycle cooler (multi-stage) has been investigated only via experimental and numerical techniques (including finite difference method, numerical ε-NTU technique, statistical design tools all of which are sophisticated and require high computational time). However, the precision aspect and analysis speed of analytical approach is undeniable and it is considered as the priority in most engineering problems. Hence, in this study, an analytical model is developed for three-stage regenerative M-cycle exchanger which can be developed for any number of perforations. All modeling process is described in detail (step by step) to make it ease understanding for readers. Evaluation methods of all required parameters are described in detail as well. Finally, the model is verified with numerical results.
Hamed Sadighi Dizaji; Eric Jing Hu; Lei Chen; Samira Pourhedayat. Development and validation of an analytical model for perforated (multi-stage) regenerative M-cycle air cooler. Applied Energy 2018, 228, 2176 -2194.
AMA StyleHamed Sadighi Dizaji, Eric Jing Hu, Lei Chen, Samira Pourhedayat. Development and validation of an analytical model for perforated (multi-stage) regenerative M-cycle air cooler. Applied Energy. 2018; 228 ():2176-2194.
Chicago/Turabian StyleHamed Sadighi Dizaji; Eric Jing Hu; Lei Chen; Samira Pourhedayat. 2018. "Development and validation of an analytical model for perforated (multi-stage) regenerative M-cycle air cooler." Applied Energy 228, no. : 2176-2194.
Maisotsenko cycle (M-cycle) is a promising air cooling technique which can reduce the temperature of air flow until dew point which was not possible either in direct contact techniques or former indirect evaporative methods. M-cycle systems have been employed previously on gas turbines, air conditioning systems, cooling towers, electronic cooling etc. Simultaneous consideration of all of them prevents detailed presentation. For that reason and because of the wide application of air conditioning systems, this paper focuses only on the use of M-cycle on air conditioning systems. Moreover, former types of indirect evaporative air coolers which do not work based on Maisotsenko cycle are not considered in the present study. Researchers have evaluated the M-cycle characteristics via different methods including analytical solution, numerical simulation, statistical design methods and experimental-techniques all of which is divided into several categories as well. All said methods are organizedly discussed and compared in this paper. It has been tried to provide an evolutionary viewpoint for analytical solutions of M-cycle. Thus, analytical solutions were reorganized with unique abbreviations in order to become more understandable and comparable with each other. All M-cycle parameters (which have been analyzed via numerical or experimental ways) are coherently systematized and then a comprehensive-compact view of obtained results is presented. Finally, the current status of M-cycle industry is summarized and the future research direction on M-cycle is proposed.
Hamed Sadighi Dizaji; Eric Jing Hu; Lei Chen. A comprehensive review of the Maisotsenko-cycle based air conditioning systems. Energy 2018, 156, 725 -749.
AMA StyleHamed Sadighi Dizaji, Eric Jing Hu, Lei Chen. A comprehensive review of the Maisotsenko-cycle based air conditioning systems. Energy. 2018; 156 ():725-749.
Chicago/Turabian StyleHamed Sadighi Dizaji; Eric Jing Hu; Lei Chen. 2018. "A comprehensive review of the Maisotsenko-cycle based air conditioning systems." Energy 156, no. : 725-749.
This paper presents adsorption isotherms and isosteric heats of adsorption for methanol vapor adsorption for two commercially available activated carbon samples—207EA granules and WS-480 pellets (Calgon Carbon, U.S.A.)—which were also fully characterized using nitrogen sorption at 77 K. The heat of adsorption of methanol as a function of loading was determined using the Clausius–Clapeyron approach with isotherms obtained at 5 °C, 15 °C, and 25 °C. The isosteric heats of adsorption increased sharply at the small coverage due to increasing effect of condensation heat with coverage. The heat reached a maximum and then varies little with loading, with the average values at around 46.6 kJ/mol for 207EA and 45.1 kJ/mol for WS-480. The higher heats of adsorption for the former activated carbon reflect its more microporous nature (around 78 % compare to 62 % for WS-480 activated carbon). The heat of adsorption data is also comparable to that obtained elsewhere for other activated carbons.
Jun W. Wu; S. Hadi Madani; Mark J. Biggs; Pendleton Phillip; Chen Lei; Eric J. Hu. Characterizations of Activated Carbon–Methanol Adsorption Pair Including the Heat of Adsorptions. Journal of Chemical & Engineering Data 2015, 60, 1727 -1731.
AMA StyleJun W. Wu, S. Hadi Madani, Mark J. Biggs, Pendleton Phillip, Chen Lei, Eric J. Hu. Characterizations of Activated Carbon–Methanol Adsorption Pair Including the Heat of Adsorptions. Journal of Chemical & Engineering Data. 2015; 60 (6):1727-1731.
Chicago/Turabian StyleJun W. Wu; S. Hadi Madani; Mark J. Biggs; Pendleton Phillip; Chen Lei; Eric J. Hu. 2015. "Characterizations of Activated Carbon–Methanol Adsorption Pair Including the Heat of Adsorptions." Journal of Chemical & Engineering Data 60, no. 6: 1727-1731.
A solar-aided coal-fired power plant realizes the integration of a fossil fuel (coal or gas) and clean energy (solar). In this paper, a conventional 600 MW coal-fired power plant and a 600 MW solar-aided coal-fired power plant have been taken as the study case to understand the merits of solar-aided power generation (SAPG) technology. The plants in the case study have been analyzed by using the First and Second Laws of Thermodynamics principles. The solar irradiation and load ratio have been considered in the analysis. We conclude that if the solar irradiation was 925 W/m2 and load ratio of the SAPG plant was 100%, the exergy efficiency would be 44.54% and the energy efficiency of the plant (46.35%). It was found that in the SAPG plant the largest exergy loss was from the boiler, which accounted for about 76.74% of the total loss. When the load ratio of the unit remains at 100%, and the solar irradiation varies from 500 W/m2 to 1,100 W/m2, the coal savings would be in the range of 8.6 g/kWh to 15.8 g/kWh. If the solar irradiation were kept at 925 W/m2 while the load ratio of the plant changed from 30% to 100%, the coal savings could be in the range of 11.99 g/kWh to 13.75 g/kWh.
Rongrong Zhai; Yong Zhu; Yongping Yang; Kaiyu Tan; Eric Hu. Exergetic and Parametric Study of a Solar Aided Coal-Fired Power Plant. Entropy 2013, 15, 1014 -1034.
AMA StyleRongrong Zhai, Yong Zhu, Yongping Yang, Kaiyu Tan, Eric Hu. Exergetic and Parametric Study of a Solar Aided Coal-Fired Power Plant. Entropy. 2013; 15 (3):1014-1034.
Chicago/Turabian StyleRongrong Zhai; Yong Zhu; Yongping Yang; Kaiyu Tan; Eric Hu. 2013. "Exergetic and Parametric Study of a Solar Aided Coal-Fired Power Plant." Entropy 15, no. 3: 1014-1034.