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Thermodynamic analysis and optimization of a partial evaporating dual-pressure organic rankine cycle system for low-grade heat recovery EI SCIE
期刊论文 | 2021 , 185 | Applied Thermal Engineering
WoS CC Cited Count: 1
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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 :

Exergy Evaporators Thermoelectric power Thermoanalysis Temperature Waste heat Quality control Rankine cycle Thermal energy

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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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Design methodology and performance analysis of conical rotors for dry screw vacuum pumps EI SCIE
期刊论文 | 2021 , 185 | Vacuum
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Abstract :

The conical rotor, as an alternative internal compression structure, has shown the potential to enhance the performance of screw vacuum pumps further. In view of no available literature examining the design of them, to fill this gap, mathematical models for the generation and analysis of conical rotors were established in this paper. The generation process was based on a design implementing a rotor profile cluster and a conical helix. The analysis model reflected the geometric characteristics and thermodynamic performance of conical rotors. The effect of key parameters in conical rotors was investigated, and the difference between conical rotors and variable-pitch rotors was revealed. Results showed that with the increase in the conical angle the internal volume index enlarged while both the specific power and pumping speed decreased. To achieve greater internal compression, more rotor stages were needed. The rotor performance could be improved by changing the distribution of the tooth width angle for the rotor profile cluster at a certain inlet pressure. In comparison with the variable-pitch rotor, the specific power was lower for the conical rotor at a close pumping speed. © 2020

Keyword :

Screws Vacuum pumps

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GB/T 7714 Li, Dantong , He, Zhilong , Wang, Chuang et al. Design methodology and performance analysis of conical rotors for dry screw vacuum pumps [J]. | Vacuum , 2021 , 185 .
MLA Li, Dantong et al. "Design methodology and performance analysis of conical rotors for dry screw vacuum pumps" . | Vacuum 185 (2021) .
APA Li, Dantong , He, Zhilong , Wang, Chuang , Guo, Yi , Wei, Wei , Lin, Dong et al. Design methodology and performance analysis of conical rotors for dry screw vacuum pumps . | Vacuum , 2021 , 185 .
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Noise control of a twin-screw refrigeration compressor EI SCIE
期刊论文 | 2021 , 124 , 30-42 | International Journal of Refrigeration
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Abstract :

Twin-screw compressors are widely used in refrigeration systems, but noise is a serious problem during operation. Gas pulsation is the main noise excitation source in twin-screw compressors, and the noise has significant fundamental harmonic characteristics. In this study, the noise characteristics of a screw compressor were experimentally investigated, which provides insight into the noise control technology of the compressor. The analysis incorporated the noise control theory and the structural characteristics of the experimental compressor. The noise reduction schemes including half-wavelength tube, Helmholtz resonator, and multi-cavity series muffler were proposed, and the noise attenuation performances of these methods were studied experimentally. The results showed that application of these noise reduction strategies significantly reduced the noise level by 10.7 dBA, 10.9 dBA, 7.2 dBA, and 10.2 dBA at the male rotor side, the female rotor side, the suction side, and the exhaust side, respectively. Comparative test results indicated that the use of the exhaust muffler and the attenuation scheme on the exhaust bearing block was most effective and it reduced the compressor noise level by 8.17 dBA. These results provided useful guidance for designing a quiet compressor. © 2020

Keyword :

Compressors Mufflers Refrigeration Acoustic resonators Noise abatement Acoustic variables control

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GB/T 7714 He, Zhilong , Li, Dantong , Han, Yaoxiang et al. Noise control of a twin-screw refrigeration compressor [J]. | International Journal of Refrigeration , 2021 , 124 : 30-42 .
MLA He, Zhilong et al. "Noise control of a twin-screw refrigeration compressor" . | International Journal of Refrigeration 124 (2021) : 30-42 .
APA He, Zhilong , Li, Dantong , Han, Yaoxiang , Zhou, Minglong , Xing, Ziwen , Wang, Xiaolin . Noise control of a twin-screw refrigeration compressor . | International Journal of Refrigeration , 2021 , 124 , 30-42 .
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Thermodynamic analysis and operation optimization on a novel heating and cooling integrated system with twin screw compressor and intercooler EI SCIE
期刊论文 | 2021 , 131 , 359-367 | INTERNATIONAL JOURNAL OF REFRIGERATION
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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 :

Operation Optimization Thermodynamic Analysis Condensation Heat Recovery Compressor Load Rate Intercooler

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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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Research on Heat and Mass Transfer Characteristics of Water Lubricated Twin-screw Air Compressor EI
期刊论文 | 2021 , 57 (8) , 247-254 | Journal of Mechanical Engineering
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Abstract :

The water-lubricated twin-screw air compressor has attracted wide attention because it can provide absolutely oil-free clean air. In order to study the heat and mass transfer characteristics of the water-lubricated twin-screw air compressor, a working process model considering the flow, heat and mass transfer of dry air, water vapor and liquid water is established, and the calculated results are verified by the experimental data from the perspective of p-V diagrams. By comparison, it can be found that the simulation results are in good agreement with the experimental results, and then the heat and mass transfer characteristics of three-phase fluids are studied. The results show that a large amount of water injected into the rotor cavity still does not achieve the full heat exchange with the wet air, so that the wet air still has a large temperature rise in the compression process. The maximum temperature rise of liquid water is less than 15 K, which proves that the evaporation of liquid water is caused by the convective mass transfer phenomenon driven by the density difference between liquid water surface and wet air. Moreover, the convective mass transfer phenomenon is that the water vapor in the wet air condensed into liquid water in most of the compression and exhaust process. Therefore, the wet air is far from saturated state in the compression process, and it is closer to the dry air as the compression process goes forward. © 2021 Journal of Mechanical Engineering.

Keyword :

Lubrication Heat transfer Mass transfer Water vapor Gas compressors Liquids

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GB/T 7714 Wang, Chuang , Zhang, Yiqin , Yuan, Hengchuan et al. Research on Heat and Mass Transfer Characteristics of Water Lubricated Twin-screw Air Compressor [J]. | Journal of Mechanical Engineering , 2021 , 57 (8) : 247-254 .
MLA Wang, Chuang et al. "Research on Heat and Mass Transfer Characteristics of Water Lubricated Twin-screw Air Compressor" . | Journal of Mechanical Engineering 57 . 8 (2021) : 247-254 .
APA Wang, Chuang , Zhang, Yiqin , Yuan, Hengchuan , Xing, Ziwen . Research on Heat and Mass Transfer Characteristics of Water Lubricated Twin-screw Air Compressor . | Journal of Mechanical Engineering , 2021 , 57 (8) , 247-254 .
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A GA-LSSVM approach for predicting and controlling in screw chiller SCIE
期刊论文 | 2021 , 235 (7) , 1649-1660 | PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART A-JOURNAL OF POWER AND ENERGY
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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 :

LSSVM cooling capacity control strategy 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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Experimental investigation on twin screw refrigeration compressor with different capacity control methods EI SCIE
期刊论文 | 2021 , 130 , 370-381 | INTERNATIONAL JOURNAL OF REFRIGERATION
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Abstract :

Slide valve and variable-speed control are commonly used in twin screw refrigeration compressors independently to regulate the refrigerating capacity of the compressor. In this paper, the pressure fluctuation characteristics, noise characteristics, and thermodynamic performance of a twin screw refrigeration compressor with slide valve and variable-speed control at the same volume flow rate are tested and compared. The relationship among pressure fluctuation, noise characteristics, and thermodynamic performance is investigated, when the evaporating temperature and the condensing temperature are set to 6 degrees C and 36 degrees C, respectively. Results show that the compressor with variable-speed control has better comprehensive characteristics than that with slide valve. The noise of the compressor with variable-speed control is lower than that of the compressor with the slide valve and the reduction of noise reaches 10.52 dB(A) at the volume flow rate of 381.07 m(3).h(-1). The thermodynamic performance under part-load conditions of the compressor with variable-speed control is better than that of the compressor with slide valve. The improvement of COP and total efficiency reaches 33.57% and 38.16% at the volume flow rate of 381.07 m(3).h(-1). (C) 2021 Elsevier Ltd and IIR. All rights reserved.

Keyword :

Twin screw refrigeration compressor Thermodynamic performance Noise characteristics Part-load condition Pressure fluctuation

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GB/T 7714 Sun, Shizhong , Xing, Ziwen , Li, Yanpeng et al. Experimental investigation on twin screw refrigeration compressor with different capacity control methods [J]. | INTERNATIONAL JOURNAL OF REFRIGERATION , 2021 , 130 : 370-381 .
MLA Sun, Shizhong et al. "Experimental investigation on twin screw refrigeration compressor with different capacity control methods" . | INTERNATIONAL JOURNAL OF REFRIGERATION 130 (2021) : 370-381 .
APA Sun, Shizhong , Xing, Ziwen , Li, Yanpeng , Su, Po Chia , Chen, Wenqing . Experimental investigation on twin screw refrigeration compressor with different capacity control methods . | INTERNATIONAL JOURNAL OF REFRIGERATION , 2021 , 130 , 370-381 .
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Minimum clearance technology to improve performance of twin-screw refrigeration compressors by spraying coating on rotors EI SCIE
期刊论文 | 2021 , 235 (4) , 1082-1091 | PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART E-JOURNAL OF PROCESS MECHANICAL ENGINEERING
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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 :

fluid-solid coupled analysis twin-screw refrigeration compressor clearance deformation Abradable coating

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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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Development and analysis of novel six-lobe helical rotors for hydrogen fuel cell vehicle roots blowers EI SCIE
期刊论文 | 2021 , 46 (59) , 30479-30493 | INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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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 Hydrogen fuel cell Roots blower Rotor profile Design analysis

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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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Theoretical research on the wear characteristics of rotors in a twin-screw compressor SCIE
期刊论文 | 2021 | PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART E-JOURNAL OF PROCESS MECHANICAL ENGINEERING
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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 Twin-screw compressor rotor profile rotor wear

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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 .
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 (2021) .
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 .
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