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< Page ,Total 19 >
Investigation of characteristics of discharge pressure pulsation in a twin-screw refrigeration compressor EI Scopus SCIE
期刊论文 | 2019 , 233 (6) , 2206-2224 | Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science
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Abstract :

In this paper, characteristics of discharge pressure pulsation in a twin-screw refrigeration compressor are investigated. A thermodynamic model is developed and validated using data from a comprehensive experimental study. This validated model is then applied to investigate effects of key parameters including condensing temperature, compressor rotational speed, super-feed pressure, part-load operation, and design parameters on the discharge pressure pulsation. The results showed that the discharge pressure pulsation was mainly due to periodic variations of mass and energy flow from the working volumes to the discharge chamber. As the condensing temperature increased or decreased from the design condition, the compressor was in either over- or undercompression leading to an increase in the amplitude of the pressure pulsation. The gas super-feed pressure could increase the pressure pulsation at condensing temperatures below the design value and reduce the pressure pulsation at condensing temperatures above the design value. The analysis also demonstrated that the pressure pulsation was lower at part-load conditions. However, the compressor rotational speed increased both the amplitude and frequency of the pressure pulsation. Theoretical analysis of design parameters indicated that a large discharge volume with a high number of lobes could lower the pressure pulsation. These analyses provide useful information for the compressor design and optimization. © 2018, IMechE 2018.

Keyword :

Condensing temperature Discharge pressures Part load conditions Part load operation Pressure pulsation Refrigeration compressors Thermodynamic model Twin screw

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GB/T 7714 Chen, Wenqing , Wu, Xiaokun , Xing, Ziwen et al. Investigation of characteristics of discharge pressure pulsation in a twin-screw refrigeration compressor [J]. | Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science , 2019 , 233 (6) : 2206-2224 .
MLA Chen, Wenqing et al. "Investigation of characteristics of discharge pressure pulsation in a twin-screw refrigeration compressor" . | Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 233 . 6 (2019) : 2206-2224 .
APA Chen, Wenqing , Wu, Xiaokun , Xing, Ziwen , Wang, Xiaolin . Investigation of characteristics of discharge pressure pulsation in a twin-screw refrigeration compressor . | Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science , 2019 , 233 (6) , 2206-2224 .
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A method for COP prediction of an on-site screw chiller applied in cinema EI SCIE
期刊论文 | 2019 , 98 , 459-467 | International Journal of Refrigeration
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Abstract :

An artificial neural (ANN) model is developed under on-site operating conditions, and it is different within a laboratory. On-site testing carried out to gather amount of data is for the purpose of training and prediction. Back propagation algorithm (BP) is applied to establish the transient coefficient of performance (COP) prediction model. The most suitable network structure is selected by comparison and cross-validation method, and the selected model is trained through setting the suitable network parameters. The error between the predicted results and the experimental data is almost within ±5.0% and the maximum error is 5.8%. Additionally, the validated model is used to evaluate the performance of a water-cooled variable frequency screw water chiller under various operating conditions and different openness of electronic expansion valve (EXV). It is valuable to apply neutral network on water-cooled screw chillers with maximum efficiency when satisfying a building cooling load instantly under necessary conditions. © 2018

Keyword :

Artificial neutral network Building cooling load Cross-validation methods Electronic expansion valves Network parameters Operating condition Transient coefficients Variable frequencies

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GB/T 7714 Tian, Chengcheng , Xing, Ziwen , Pan, Xi et al. A method for COP prediction of an on-site screw chiller applied in cinema [J]. | International Journal of Refrigeration , 2019 , 98 : 459-467 .
MLA Tian, Chengcheng et al. "A method for COP prediction of an on-site screw chiller applied in cinema" . | International Journal of Refrigeration 98 (2019) : 459-467 .
APA Tian, Chengcheng , Xing, Ziwen , Pan, Xi , Tian, Yafen . A method for COP prediction of an on-site screw chiller applied in cinema . | International Journal of Refrigeration , 2019 , 98 , 459-467 .
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Theoretical study and experimental verification of the leakage losses of R410A in the swing compressor with no valves SCIE
期刊论文 | 2019 , 99 , 327-336 | INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID
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Abstract :

This paper presents a detailed analysis on the leakage characteristics of R410A in the swing compressor with no valves. Leakage losses through all clearances have been studied by using the present method. Simulation results show that the leakage loss through the clearances between rotor faces and the head walls of the cylinder becomes the most important one and the second one is the leakage loss through the radial clearance. Additionally, refrigerant mass flow rate is used as an important parameter to verify the accuracy of the theoretical formulas. Calculation results of the theoretical refrigerant mass flow rate are compared with the experimental results and the results are satisfactory. Furthermore, an optimization measure has been provided for the design of the swing compressor with no valves. (C) 2019 Elsevier Ltd and IIR. All rights reserved.

Keyword :

Leakage loss No valves Swing compressor Experimental verification Simulation

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GB/T 7714 Pan, Xi , Sun, Shizhong , Xing, Ziwen et al. Theoretical study and experimental verification of the leakage losses of R410A in the swing compressor with no valves [J]. | INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID , 2019 , 99 : 327-336 .
MLA Pan, Xi et al. "Theoretical study and experimental verification of the leakage losses of R410A in the swing compressor with no valves" . | INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID 99 (2019) : 327-336 .
APA Pan, Xi , Sun, Shizhong , Xing, Ziwen , Pan, Shulin . Theoretical study and experimental verification of the leakage losses of R410A in the swing compressor with no valves . | INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID , 2019 , 99 , 327-336 .
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Modeling analysis on solar steam generator employed in multi-effect distillation (MED) system SCIE
期刊论文 | 2019 , 13 (1) , 193-203 | FRONTIERS IN ENERGY
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Abstract :

Recently the porous bilayer wood solar collectors have drawn increasing attention because of their potential application in solar desalination. In this paper, a thermodynamic model has been developed to analyze the performance of the wood solar collector. A modeling analysis has also been conducted to assess the performance and operating conditions of the multiple effect desalination (MED) system integrated with the porous wood solar collector. Specifically, the effects of operating parameters, such as the motive steam temperature, seawater flow rate, input solar energy and number of effects on the energy consumption for each ton of distilled water produced have been investigated in the MED desalination system combined with the bilayer wood solar steam generator. It is found that, under a given operating condition, there exists an optimum steam generation temperature of around 145 degrees C in the wood solar collector, so that the specific power consumption in the MED system reaches a minimum value of 24.88 kWh/t. The average temperature difference is significantly affected by the solar heating capacity. With the solar capacity increasing from 50 kW to 230 kW, the average temperature difference increases from 1.88 degrees C to 6.27 degrees C. This parametric simulation study will help the design of efficient bilayer wood solar steam generator as well as the MED desalination system.

Keyword :

steam generating solar energy multi-effect desalination

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GB/T 7714 Zhao, Zhaorui , Yang, Bao , Xing, Ziwen . Modeling analysis on solar steam generator employed in multi-effect distillation (MED) system [J]. | FRONTIERS IN ENERGY , 2019 , 13 (1) : 193-203 .
MLA Zhao, Zhaorui et al. "Modeling analysis on solar steam generator employed in multi-effect distillation (MED) system" . | FRONTIERS IN ENERGY 13 . 1 (2019) : 193-203 .
APA Zhao, Zhaorui , Yang, Bao , Xing, Ziwen . Modeling analysis on solar steam generator employed in multi-effect distillation (MED) system . | FRONTIERS IN ENERGY , 2019 , 13 (1) , 193-203 .
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Theoretical study of two-stage water vapor compression systems EI Scopus SCIE
期刊论文 | 2019 , 147 , 972-982 | Applied Thermal Engineering
WoS CC Cited Count: 1 SCOPUS Cited Count: 1
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Abstract :

© 2018 Elsevier Ltd Water vapor compression is a key technology that greatly affects system performance in heat pump and mechanical vapor compression/recompression applications. In this paper, two-stage water vapor compression methods (cascaded centrifugal compressors and combined centrifugal and twin-screw compressors) were proposed and studied to deal with the water compression process with large suction volume flow rates and high compression pressure ratios. A mathematical model was developed, and the thermal characteristics, achievable volume flow rate and saturation temperature rise of the two water compression systems were presented. The two-stage compression process using cascaded centrifugal compressors was found to be better for applications with total saturation temperature rise lower than 40 °C. The two-stage compression process using combined centrifugal and twin-screw compressors was found to satisfy applications with a saturation temperature rise as high as 80 °C. Further investigation showed that the second method could deliver a suction volume flow rate of 1418 m3/min with a suction vapor temperature of 50 °C using a current market-available twin-screw compressor with a capacity of 600 m3/min. The performance of the combined systems was largely affected by the pressure ratio and the compressor efficiency, system suction vapor temperature, and total vapor saturation temperature rise. The analyses showed that the combined system had high energy efficiency above 3.4 under all studied working conditions.

Keyword :

Centrifugal compressor Compressor efficiency Energy efficient Twin-screw compressor Vapor compression

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GB/T 7714 Shen, Jiubing , Feng, Guozeng , Xing, Ziwen et al. Theoretical study of two-stage water vapor compression systems [J]. | Applied Thermal Engineering , 2019 , 147 : 972-982 .
MLA Shen, Jiubing et al. "Theoretical study of two-stage water vapor compression systems" . | Applied Thermal Engineering 147 (2019) : 972-982 .
APA Shen, Jiubing , Feng, Guozeng , Xing, Ziwen , Wang, Xiaolin . Theoretical study of two-stage water vapor compression systems . | Applied Thermal Engineering , 2019 , 147 , 972-982 .
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Structural study on a swing compressor with no valves for air compression EI Scopus SCIE
期刊论文 | 2018 , 232 (23) , 4390-4398 | Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science
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Abstract :

This paper presents a novel swing compressor with no valves employed in air compression. The design and work principle of this swing compressor are introduced. And the effects of discharge port, exhaust cavity, and crank speed on the performances of this compressor are analyzed. Under the same operating conditions and dimensions, the size of exhaust cavity mainly depends on the discharge port width. Additionally, the exhaust cavity angle has a direct impact on the compression process, whether it is over-compression or under-compression. And the over-compression loss can be designed below 2%. Overall, the assessment of the structure shows that this novel swing compressor with no valves has the advantages of simple component geometries, light weight, and high efficiency, which makes it well suited to the requirements of air compression. © 2017, IMechE 2017.

Keyword :

Component geometries Compression process Discharge port exhaust cavity High-efficiency Operating condition Over-compression Structural studies

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GB/T 7714 Pan, Xi , Wang, Man , Xing, Zi-Wen et al. Structural study on a swing compressor with no valves for air compression [J]. | Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science , 2018 , 232 (23) : 4390-4398 .
MLA Pan, Xi et al. "Structural study on a swing compressor with no valves for air compression" . | Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 232 . 23 (2018) : 4390-4398 .
APA Pan, Xi , Wang, Man , Xing, Zi-Wen , Pan, Shu-Lin . Structural study on a swing compressor with no valves for air compression . | Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science , 2018 , 232 (23) , 4390-4398 .
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Simulation of the characteristics of the water-lubricated journal bearing in twin-screw air compressor EI Scopus SCIE
期刊论文 | 2018 , 70 (8) , 1476-1486 | Industrial Lubrication and Tribology
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Abstract :

Purpose: The well-operating condition of journal bearing is the assurance to keep superior performance of water-lubricated twin-screw compressor. To design the journal bearing more reasonably for this type of compressor, this paper aims to study the effects of rotating speed and design parameters on bearing characteristics, considering surface roughness and bending deformation of the shaft at the same time. Design/methodology/approach: The average Reynolds equation considering the effect of surface roughness is adopted and solved by finite difference method and successive over-relaxation method to calculate pressure distribution with real bearing shapes and boundary conditions. The bending deformation of the shaft is calculated using simply supported beam model of variable cross-section. Findings: The dynamic lubrication characteristics of four water-lubricated journal bearings in twin-screw air compressor are calculated and analyzed. In addition, the static characteristics of journal bearing including friction coefficient, film thickness ratio distribution and water film pressure distribution are calculated numerically with different rotating speed and design parameters. Moreover, some design principles of water-lubricated bearing for twin-screw compressor are put forward. Originality/value: The lubrication characteristics of the water-lubricated journal bearing in twin-screw air compressor are calculated considering surface roughness and bending deformation of the shaft at the same time. The paper’s results may provide design guidelines for journal bearing in this kind of twin-screw compressor. © 2018, Emerald Publishing Limited.

Keyword :

Design/methodology/approach Lubrication characteristics Simply supported beam model Successive over relaxation methods Twin screw Water lubricated Water lubricated bearings Water-lubricated journal bearing

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GB/T 7714 Wang, Chuang , Xing, Ziwen , Pan, Xi et al. Simulation of the characteristics of the water-lubricated journal bearing in twin-screw air compressor [J]. | Industrial Lubrication and Tribology , 2018 , 70 (8) : 1476-1486 .
MLA Wang, Chuang et al. "Simulation of the characteristics of the water-lubricated journal bearing in twin-screw air compressor" . | Industrial Lubrication and Tribology 70 . 8 (2018) : 1476-1486 .
APA Wang, Chuang , Xing, Ziwen , Pan, Xi , He, Zhilong . Simulation of the characteristics of the water-lubricated journal bearing in twin-screw air compressor . | Industrial Lubrication and Tribology , 2018 , 70 (8) , 1476-1486 .
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Optimization on shaft seals for a twin-screw steam compressor based on a novel uniform property region (UPR) model on discharge end-face EI SCIE
期刊论文 | 2018 , 91 , 167-176 | INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID
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Abstract :

Different from other types of compressor, pressure distribution on twin-screw compressor discharge end-face is related to both operating pressure and the lobe number, instead of being regarded as discharge pressure. In this paper, a mathematical model is developed based on a novel uniform property region (UPR) model to predict leakage through shaft seals, which was validated with experimental data. Simulation results show the leakage flow rate of shaft seals decreases dramatically and then reduces slightly with carbon rings number increases. The flow diameter of balance pipe determines the balance between internal and external leakage. Based on the analysis, several suggestions were given on optimizing shaft seals. For the discussed steam compressor, the number of carbon rings can be reduced from 4 to 1 and the flow diameter of balance pipe should be adjusted from 10 mm to 5 mm with a regulating throttling valve. (C) 2018 Elsevier Ltd and IIR. All rights reserved.

Keyword :

Heat pump Twin-screw steam compressor Leakage prediction Optimization UPR model Shaft seals

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GB/T 7714 Tian, Yafen , Lu, Jialun , Shen, Jiubing et al. Optimization on shaft seals for a twin-screw steam compressor based on a novel uniform property region (UPR) model on discharge end-face [J]. | INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID , 2018 , 91 : 167-176 .
MLA Tian, Yafen et al. "Optimization on shaft seals for a twin-screw steam compressor based on a novel uniform property region (UPR) model on discharge end-face" . | INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID 91 (2018) : 167-176 .
APA Tian, Yafen , Lu, Jialun , Shen, Jiubing , Wu, Huagen , Xing, Ziwen . Optimization on shaft seals for a twin-screw steam compressor based on a novel uniform property region (UPR) model on discharge end-face . | INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID , 2018 , 91 , 167-176 .
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Experimental Investigation into the Effect of Oil Injection on the Performance of a Variable Speed Twin-Screw Compressor EI SCIE Scopus
期刊论文 | 2018 , 11 (6) | ENERGIES
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Abstract :

In this paper, the effect of oil injection flow rate on the performance of a variable speed twin-screw compressor was investigated experimentally. Comprehensive experiments were conducted at different compressor rotational speeds and oil injection flow rates. As the rotational speed increased from 1000 to 3000 rpm, the compressor volumetric and adiabatic efficiencies increased while the specific power consumption decreased. However, the oil injection flow rate showed different influences on the compressor performance. As the oil injection flow rate increased from 27 to 50 L/min, the adiabatic and volumetric efficiencies increased while the compressor discharge temperature and specific power decreased. Further increases in the oil injection flow rate had little effect on compressor performance at flow rates above 50 L/min. The analysis indicated that the oil injection flow rate was limited by the discharge temperature at low compressor rotational speeds and was a trade-off among two efficiencies and specific power consumption at high rotational speeds.

Keyword :

twin-screw compressor thermal performance oil injection

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GB/T 7714 He, Zhilong , Wang, Tao , Wang, Xiaolin et al. Experimental Investigation into the Effect of Oil Injection on the Performance of a Variable Speed Twin-Screw Compressor [J]. | ENERGIES , 2018 , 11 (6) .
MLA He, Zhilong et al. "Experimental Investigation into the Effect of Oil Injection on the Performance of a Variable Speed Twin-Screw Compressor" . | ENERGIES 11 . 6 (2018) .
APA He, Zhilong , Wang, Tao , Wang, Xiaolin , Peng, Xueyuan , Xing, Ziwen . Experimental Investigation into the Effect of Oil Injection on the Performance of a Variable Speed Twin-Screw Compressor . | ENERGIES , 2018 , 11 (6) .
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Research on axis orbit of the journal bearing lubricated with oil and refrigerant mixtures in a twin-screw refrigeration compressor EI SCIE
期刊论文 | 2018 , 90 , 1-11 | INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID
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In twin-screw refrigeration compressor for high pressure applications, journal bearing has been a preferred option to bear larger and larger radial force. Hence, the stability of rotor-journal bearing system is worth investigating to ensure the reliability of a twin-screw refrigeration compressor, which can be reflected on axis orbit. This paper presents a homogeneous two-phase flow model to calculate the axis orbit of journal bearing used in a twin-screw compressor, considering gas-induced force, unbalanced force and gravitational force. In order to compute gas-induced force acting on bearings by FEM, the p-V indicator diagram is measured experimentally. In addition, axial orbit under different evaporating temperature and different built-in volume ratio was investigated experimentally. Meanwhile it verifies that the proposed two-phase flow model has a good agreement in terms of orbit shape with the experimental result. Moreover, the effects of refrigerant mass fraction at supply groove and structural parameters are analyzed theoretically. (C) 2018 Elsevier Ltd and IIR. All rights reserved.

Keyword :

Twin-screw refrigeration compressor Rotor-bearing system Oil refrigerant mixtures Axis orbit

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GB/T 7714 Wang, Chuang , Xing, Ziwen , Hou, Feng et al. Research on axis orbit of the journal bearing lubricated with oil and refrigerant mixtures in a twin-screw refrigeration compressor [J]. | INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID , 2018 , 90 : 1-11 .
MLA Wang, Chuang et al. "Research on axis orbit of the journal bearing lubricated with oil and refrigerant mixtures in a twin-screw refrigeration compressor" . | INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID 90 (2018) : 1-11 .
APA Wang, Chuang , Xing, Ziwen , Hou, Feng , Wu, Huagen , Yu, Zhiqiang . Research on axis orbit of the journal bearing lubricated with oil and refrigerant mixtures in a twin-screw refrigeration compressor . | INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID , 2018 , 90 , 1-11 .
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