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学者姓名：邢子文
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Abstract ：
An organic Rankine cycle (ORC) system is an efficient technology for generating power from low-grade thermal sources. Twin screw expanders are widely used in ORC systems. Pressure loss caused by a suction port influences the suction process and the system performance. In this paper, the effects of suction ports on twin screw expander performance are experimentally investigated. The pressure loss value of R245fa is measured under different working conditions, and its effects on the suction coefficient are discussed. Results show that a lower rotation speed results in a lower pressure loss value and a higher suction coefficient under certain working conditions. Increasing the suction pressure leads to a higher pressure loss value but a lower pressure loss ratio. Discharge pressure has little effect on the suction process.
Keyword ：
organic Rankine cycle (ORC) performance suction port twin screw expander
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| GB/T 7714 | He, Yongning , Wu, Huihong , Zhang, Yeqiang et al. Experimental Research on the Effects of Suction Ports on Twin Screw Expander Performance [J]. | APPLIED SCIENCES-BASEL , 2022 , 12 (8) . |
| MLA | He, Yongning et al. "Experimental Research on the Effects of Suction Ports on Twin Screw Expander Performance" . | APPLIED SCIENCES-BASEL 12 . 8 (2022) . |
| APA | He, Yongning , Wu, Huihong , Zhang, Yeqiang , Jin, Tingxiang , Xing, Ziwen . Experimental Research on the Effects of Suction Ports on Twin Screw Expander Performance . | APPLIED SCIENCES-BASEL , 2022 , 12 (8) . |
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Abstract ：
As the main noise source in the hydrogen fuel cell system, the noise level of the centrifugal air compressor greatly affects the comfort of the hydrogen fuel cell vehicle. For reducing the noise level of centrifugal air compressors, the noise characteristics and control of a high-speed two-stage compressor prototype are studied in this paper. Firstly, the near-field noise measurement, along with the independent component analysis, is carried out to identify the noise source of the developed compressor. Results showed that the "buzz-saw" noise at the rotating fundamental frequency and its low order harmonic frequency in the aerodynamic noise is prominent in the noise spectrum. Thus, the aerodynamic noise characteristics are predicted and analyzed using the CFD-BEM coupling aeroacoustic calculation model. Based on the analysis results, a noise control method coupling the structure optimization and perforated muffler is proposed. The results show that the sound pressure level of the air compressor at 1 m away from the surface is reduced by 4.1 dBA after the structural optimization. A perforated muffler applied in the pipe system of the air compressor can accomplish a reduction of 5.8 dBA in the sound pressure level of the air compressor by impeding the noise transmission on the path. With the coupled noise control methods above, the sound pressure level of the air compressor is reduced from 78.8 dBA to 68.9 dBA under the rated condition.
Keyword ：
aerodynamic noise CFD-BEM coupling analysis fuel cell independent component analysis perforated muffler two-stage centrifugal air compressor
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| GB/T 7714 | Sun, Shizhong , Xing, Ziwen , Chen, Wenqing et al. Study on Characteristics and Control of Aerodynamic Noise of a High-Speed Centrifugal Air Compressor for Vehicle Fuel Cells [J]. | APPLIED SCIENCES-BASEL , 2022 , 12 (19) . |
| MLA | Sun, Shizhong et al. "Study on Characteristics and Control of Aerodynamic Noise of a High-Speed Centrifugal Air Compressor for Vehicle Fuel Cells" . | APPLIED SCIENCES-BASEL 12 . 19 (2022) . |
| APA | Sun, Shizhong , Xing, Ziwen , Chen, Wenqing , Zhou, Minglong , Wang, Chuang , Cui, Hanyang . Study on Characteristics and Control of Aerodynamic Noise of a High-Speed Centrifugal Air Compressor for Vehicle Fuel Cells . | APPLIED SCIENCES-BASEL , 2022 , 12 (19) . |
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Abstract ：
Screw machines, mainly including single-screw type and twin-screw type, have gone through significant development and improvement during the past decade. This paper reviews the relevant studies available in the open literature for acquiring insight into and to establish the state of the art of the research and application status of screw machines. The related research on different aspects, which would affect the performance and reliability of screw machines includes rotor profile and geometric characteristics, thermodynamic modelling, vibration and noise, lubrication and wear, control of capacity and built-in volume ratio, and liquid injection technology. In the aspect of thermodynamic modelling, the available methods, i.e., empirical or semi-empirical model, lump model, and 3D CFD model, adopted for the performance prediction and optimal design of screw machines are summarized. Then, the review covers the application status of screw machines in the fields of air compression and expansion, refrigeration and heat pump, organic Rankine cycle (ORC), and other popular applications, with an emphasis on the reported performance and progress in technologies of screw machines. Finally, conclusions and perspectives for future research in the area of screw machines are presented. The review provides readers with a good understanding of the research focus and progress in the field of screw machines.
Keyword ：
application progress research aspects single screw twin screw
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| GB/T 7714 | Wang, Chuang , Wang, Bingqi , Liu, Mingkun et al. A Review of Recent Research and Application Progress in Screw Machines [J]. | MACHINES , 2022 , 10 (1) . |
| MLA | Wang, Chuang et al. "A Review of Recent Research and Application Progress in Screw Machines" . | MACHINES 10 . 1 (2022) . |
| APA | Wang, Chuang , Wang, Bingqi , Liu, Mingkun , Xing, Ziwen . A Review of Recent Research and Application Progress in Screw Machines . | MACHINES , 2022 , 10 (1) . |
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Abstract ：
In response to the unreasonable utilization of energy in food processing and livestock slaughtering industries, a novel heating and cooling integrated system with twin screw compressor and intercooler is exhibited in this paper which conducts based on the conventional cascade refrigeration apparatus. The original condensation heat of refrigeration system is completely or partially recovered and the utilization of cooling and heating is achieved simultaneously. A thermodynamic model is established to determine the optimal design and operating parameters such as condensation temperatures of cycle 1 and cycle 2 (T1cond and T2cond) and compressor load rates to maximize the coefficient of performance (COP). The system performance is expected to be identified when the heating capacity and operating conditions change. The results show that T1cond, T2cond and compressor 3 load rate have a significant impact on the system COP with the variation of heating capacity. Finally, the system performance can be significantly improved by introducing an intercooler.
Keyword ：
Compressor Load Rate Condensation Heat Recovery Intercooler Operation Optimization Thermodynamic Analysis
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| GB/T 7714 | Wu, Huagen , Liang, Mengtao , Liu, Jiankang et al. Thermodynamic analysis and operation optimization on a novel heating and cooling integrated system with twin screw compressor and intercooler [J]. | INTERNATIONAL JOURNAL OF REFRIGERATION , 2021 , 131 : 359-367 . |
| MLA | Wu, Huagen et al. "Thermodynamic analysis and operation optimization on a novel heating and cooling integrated system with twin screw compressor and intercooler" . | INTERNATIONAL JOURNAL OF REFRIGERATION 131 (2021) : 359-367 . |
| APA | Wu, Huagen , Liang, Mengtao , Liu, Jiankang , Shen, Yuqi , Zhang, Huimin , Xing, Ziwen . Thermodynamic analysis and operation optimization on a novel heating and cooling integrated system with twin screw compressor and intercooler . | INTERNATIONAL JOURNAL OF REFRIGERATION , 2021 , 131 , 359-367 . |
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Abstract ：
Thanks to the development and application of coating technology and polymer rotor material, it is an inevitable trend to eliminate synchronous gear for water-injected and dry twin-screw compressors, especially running at a high speed, due to much power consumed by synchronous gears. However, it is not economical and reliable to rely only on coating or rotor material to enhance the wear resistance of rotor. This paper attempts to lighten the rotor wear in twin-screw compressors from the angle of setting driving belt. To achieve this goal, the contact analysis is carried out in this paper, taking the rotor profile of a developed water-lubricated twin-screw air compressor as an example. By the contact analysis, equivalent curvature radius, Hertz contact stress, sliding distance, the value of PHS, and the minimum film thickness of each mesh point on different tooth curve are calculated and discussed. The product of the Hertz contact stress and total sliding distance, PHS, and minimum film thickness are chosen as the evaluation indexes to estimate the wear resistance of all tooth curves. By comparing these indexes of each tooth curve, some suggestions about setting the driving belt are proposed.
Keyword ：
contact analysis driving belt rotor profile rotor wear Twin-screw compressor
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| GB/T 7714 | Wang, Chuang , Xing, Ziwen , Sun, Shizhong et al. Theoretical research on the wear characteristics of rotors in a twin-screw compressor [J]. | PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART E-JOURNAL OF PROCESS MECHANICAL ENGINEERING , 2021 , 236 (2) : 404-413 . |
| MLA | Wang, Chuang et al. "Theoretical research on the wear characteristics of rotors in a twin-screw compressor" . | PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART E-JOURNAL OF PROCESS MECHANICAL ENGINEERING 236 . 2 (2021) : 404-413 . |
| APA | Wang, Chuang , Xing, Ziwen , Sun, Shizhong , Chen, Wenqing , He, Zhilong . Theoretical research on the wear characteristics of rotors in a twin-screw compressor . | PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART E-JOURNAL OF PROCESS MECHANICAL ENGINEERING , 2021 , 236 (2) , 404-413 . |
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Abstract ：
The organic Rankine cycle (ORC) has been proven as one of the most effective technologies for low-grade heat recovery. However, its efficiency is limited due to exergy losses caused by the large temperature difference between the heat source and working fluid in the evaporator. To enhance the ORC system efficiency, in this paper, a novel partial evaporating dual-pressure ORC (PEDORC) system is proposed. A mathematical model is developed to evaluate the system thermal characteristics and investigate the effects of key parameters (e.g. evaporating temperature, quality, superheat temperature, energy distribution) on the system performance. Results show that an optimal evaporating temperature in the evaporators exists to achieve the maximum net power output and exergy efficiency. However, the system thermal efficiency increases as the evaporating temperature increases. Furthermore, the best thermal performance occurs when the thermal energy is properly distributed in the evaporators I and II. The performance of the proposed PEDORC system is further compared with the simple ORC (SORC) and basic dual-pressure ORC (BDORC) systems. The results show that the net power output and exergy efficiency of the proposed PEDORC system are increased by up to 27% and 4.6%, respectively, in comparison to the SORC system. By comparing with the BDORC system, the net power output and exergy efficiency of the proposed system are increased by up to 9.2% and 4%, respectively, and the Levelized Cost of Electricity is reduced by up to 4%. These analyses demonstrate that the proposed PEDORC system is an effective means to recover low-grade thermal energy. © 2020 Elsevier Ltd
Keyword ：
Evaporators Exergy Quality control Rankine cycle Temperature Thermal energy Thermoanalysis Thermoelectric power Waste heat
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| GB/T 7714 | Li, Dantong , He, Zhilong , Wang, Qi et al. Thermodynamic analysis and optimization of a partial evaporating dual-pressure organic rankine cycle system for low-grade heat recovery [J]. | Applied Thermal Engineering , 2021 , 185 . |
| MLA | Li, Dantong et al. "Thermodynamic analysis and optimization of a partial evaporating dual-pressure organic rankine cycle system for low-grade heat recovery" . | Applied Thermal Engineering 185 (2021) . |
| APA | Li, Dantong , He, Zhilong , Wang, Qi , Wang, Xiaolin , Wu, Weifeng , Xing, Ziwen . Thermodynamic analysis and optimization of a partial evaporating dual-pressure organic rankine cycle system for low-grade heat recovery . | Applied Thermal Engineering , 2021 , 185 . |
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Abstract ：
During the operating of twin-screw refrigeration compressors, the leakage has a significant influence on the performance of compressors. In this paper, a novel minimum clearance technology that applies the abradable coating to the rotor surface is proposed to lessen the leakage. In order to adapt to the application of the abradable coating, the deformation of rotors during operation is analyzed and a suitable clearance is designed based on the fluid-solid coupling analysis. Then, a suitable coating pre-treated by sandblasting is obtained according to the results of friction coefficient and abradability test. Finally, a prototype is tested and the total efficiency, volumetric efficiency, refrigerating capacity, and COP of the prototype are compared before and after spraying the coating. Test results show that the volumetric efficiency and refrigerating capacity increase significantly after spraying the abradable coating, and the input power decreases slightly. As a result, the COP increases by 6.71% and 7.89% at two nominal operating conditions.
Keyword ：
Abradable coating clearance deformation fluid-solid coupled analysis twin-screw refrigeration compressor
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| GB/T 7714 | Sun, Shizhong , Li, Yanpeng , Chen, Wenqing et al. Minimum clearance technology to improve performance of twin-screw refrigeration compressors by spraying coating on rotors [J]. | PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART E-JOURNAL OF PROCESS MECHANICAL ENGINEERING , 2021 , 235 (4) : 1082-1091 . |
| MLA | Sun, Shizhong et al. "Minimum clearance technology to improve performance of twin-screw refrigeration compressors by spraying coating on rotors" . | PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART E-JOURNAL OF PROCESS MECHANICAL ENGINEERING 235 . 4 (2021) : 1082-1091 . |
| APA | Sun, Shizhong , Li, Yanpeng , Chen, Wenqing , Xing, Ziwen , Liu, Hua . Minimum clearance technology to improve performance of twin-screw refrigeration compressors by spraying coating on rotors . | PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART E-JOURNAL OF PROCESS MECHANICAL ENGINEERING , 2021 , 235 (4) , 1082-1091 . |
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Abstract ：
Performance of varying speed screw chiller is affected by many uncertainties. High precision prediction of its characteristics can guide the chiller to reach a better performance. This study presents an artificial intelligence model named least square support vector machine (LSSVM) with genetic algorithm (GA). Five parameters are predicted with the model, including COP, discharge pressure, suction temperature, suction pressure and cooling capacity. By comparing the simulation results with the test results, this model shows a high precision ability to predict the performance of the on-site chiller. Additionally, a newly control strategy is introduced to help the chiller with optimizing performance. Cooling capacity and superheat degree are separately used as input to train the model to control openness of EXV. The prediction of this control strategy process shows enough ability to predict openness of EXV. The results can be used to guide the chiller to reach better performances by adjusting the corresponding parameters.
Keyword ：
control strategy cooling capacity LSSVM screw chiller
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| GB/T 7714 | Tian, Chengcheng , Xing, Ziwen , Pan, Xi et al. A GA-LSSVM approach for predicting and controlling in screw chiller [J]. | PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART A-JOURNAL OF POWER AND ENERGY , 2021 , 235 (7) : 1649-1660 . |
| MLA | Tian, Chengcheng et al. "A GA-LSSVM approach for predicting and controlling in screw chiller" . | PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART A-JOURNAL OF POWER AND ENERGY 235 . 7 (2021) : 1649-1660 . |
| APA | Tian, Chengcheng , Xing, Ziwen , Pan, Xi , Wang, Haojie . A GA-LSSVM approach for predicting and controlling in screw chiller . | PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART A-JOURNAL OF POWER AND ENERGY , 2021 , 235 (7) , 1649-1660 . |
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Abstract ：
This paper suggests a novel six-lobe Roots profile to improve the performance of Roots blowers in hydrogen fuel cell vehicles. Mathematical models for rotor profile generation and geometric characteristics are established. A working process simulation model for Roots blowers is developed based on the lumped parameter method and is verified by experimental results. The key profile parameters are discussed and optimized in views of geometric and thermodynamic performance. Case studies are conducted to reveal the detailed performance map difference between several design cases. Results show that a trade-off exists between the rotor cavity volume and adiabatic indicated efficiency for Roots blowers. The proposed profile broadens the design space of rotors in tooth height and achieves a flexible adjustment for the leakage through the blow-hole and contact line. As a consequence, compared to conventional Roots profiles, the proposed rotor profile achieves higher adiabatic indicated efficiency under the same rotor cavity volume. (c) 2021 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
Keyword ：
Air supply system Design analysis Hydrogen fuel cell Roots blower Rotor profile
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| GB/T 7714 | Li, Dantong , He, Zhilong , Sun, Shizhong et al. Development and analysis of novel six-lobe helical rotors for hydrogen fuel cell vehicle roots blowers [J]. | INTERNATIONAL JOURNAL OF HYDROGEN ENERGY , 2021 , 46 (59) : 30479-30493 . |
| MLA | Li, Dantong et al. "Development and analysis of novel six-lobe helical rotors for hydrogen fuel cell vehicle roots blowers" . | INTERNATIONAL JOURNAL OF HYDROGEN ENERGY 46 . 59 (2021) : 30479-30493 . |
| APA | Li, Dantong , He, Zhilong , Sun, Shizhong , Wang, Chuang , Chen, Wenqing , Xing, Ziwen . Development and analysis of novel six-lobe helical rotors for hydrogen fuel cell vehicle roots blowers . | INTERNATIONAL JOURNAL OF HYDROGEN ENERGY , 2021 , 46 (59) , 30479-30493 . |
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Abstract ：
In this paper, a method based on least square support vector machine (LSSVM) and genetic algorithm (GA) is applied for the coefficient of performance (COP) prediction and the load regulation of each chiller in the water chiller system. In order to show the generalizability of this method, two twin-screw water chiller systems with different nominal cooling capacities applied in different situations are studied. The proposed model uses two compressors’ load rate, inlet temperature of cooling water, outlet temperature of cooling water, inlet temperature of condensing water and outlet temperature of condensing water as input parameters. COP is used as the output parameter. To increase the accuracy of the model, more than 10,000 on-site testing data points are randomly divided into the training set and the testing set for each case. The results show that this GA-LSSVM-based model is accurate enough for COP prediction. For the first case, 98.05% of total points locate within the ± 5% lines and determination coefficient is 0.9835. For the second case, 99.66% of total points locate within the ± 5% lines and determination coefficient is 0.9907. Based on the proposed model with high precision, two different typical working conditions are used for two cases to develop the control strategy of each chiller's load regulation, which is significantly helpful to improve the performance of the water chiller system. © 2020 Elsevier B.V.
Keyword ：
Cooling Cooling water Forecasting Genetic algorithms Least squares approximations Support vector machines Water cooling systems
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| GB/T 7714 | Pan, Xi , Xing, Ziwen , Tian, Chengcheng et al. A method based on GA-LSSVM for COP prediction and load regulation in the water chiller system [J]. | Energy and Buildings , 2021 , 230 . |
| MLA | Pan, Xi et al. "A method based on GA-LSSVM for COP prediction and load regulation in the water chiller system" . | Energy and Buildings 230 (2021) . |
| APA | Pan, Xi , Xing, Ziwen , Tian, Chengcheng , Wang, Haojie , Liu, Huaican . A method based on GA-LSSVM for COP prediction and load regulation in the water chiller system . | Energy and Buildings , 2021 , 230 . |
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