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学者姓名:邢子文

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< Page ,Total 19 >
Theoretical study of two-stage water vapor compression systems EI Scopus SCIE
期刊论文 | 2019 , 147 , 972-982 | Applied Thermal Engineering
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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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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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Performance investigation of a pressure pulsation dampener applied in the discharge chamber of a twin screw refrigeration compressor EI SCIE
期刊论文 | 2018 , 85 , 70-84 | INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID
WoS CC Cited Count: 2
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Abstract :

Intermittent gas flow generates pressure oscillations in the twin-screw refrigeration compressor that cause serious problems such as structural vibration and noise. In order to reduce the amplitude of this pressure pulsation, a pressure pulsation dampener (PPD) applied in the discharge chamber of a twin screw refrigeration compressor was proposed based on the theory of Helmholtz resonator. A mathematical model was developed to design an optimal PPD by incorporating the R134-oil mixture sound speed model and the pressure pulsation simulation model. A comprehensive experimental study was then performed to validate the model and evaluate the effect of key parameters such as oil flow rate and cavity volume on attenuation performance of the PPD. Vibrational characteristics of the compressor equipped with and without the PPD were also measured and compared. Under the design frequency of 250 Hz, the vibrational acceleration of compressor under-chassis reduced by 36.2% to 41.1% when the compressor was fitted with the proposed PPD. (C) 2017 Published by Elsevier Ltd.

Keyword :

Twin-screw compressor Refrigeration Pressure pulsation dampener Discharge chamber

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GB/T 7714 Wu, Xiaokun , Xing, Ziwen , Chen, Wenqing et al. Performance investigation of a pressure pulsation dampener applied in the discharge chamber of a twin screw refrigeration compressor [J]. | INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID , 2018 , 85 : 70-84 .
MLA Wu, Xiaokun et al. "Performance investigation of a pressure pulsation dampener applied in the discharge chamber of a twin screw refrigeration compressor" . | INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID 85 (2018) : 70-84 .
APA Wu, Xiaokun , Xing, Ziwen , Chen, Wenqing , Wang, Xiaolin . Performance investigation of a pressure pulsation dampener applied in the discharge chamber of a twin screw refrigeration compressor . | INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID , 2018 , 85 , 70-84 .
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Real-time minimization of power consumption for air-source transcritical CO2 heat pump water heater system EI SCIE
期刊论文 | 2018 , 85 , 395-408 | INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID
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Abstract :

Based on Extremum Seeking Control, a real-time optimization strategy is proposed for minimizing the power consumption of a transcritical CO2 heat pump system. An analytical framework is established to justify the equivalence between power minimization and the maximization of coefficient of performance. As compared to the COP feedback, power feedback based control avoids the need for several sensors beyond the simple and reliable power measurement. The proposed ESC scheme is based on three measurements of power consumption, high-pressure and gas cooler outlet water temperature. Simulations are conducted for several scenarios: a fixed operation condition, change of ambient condition and realistic ambient temperature condition. For all simulation cases, the water inlet temperature is fixed at 12 degrees C, while the water outlet temperature is set as 60 degrees C. Simulation results show that ESC is able to search and even track both fixed and slowly varying optimum discharge pressure without need for system model. (C) 2017 Elsevier Ltd and IIR. All rights reserved.

Keyword :

Transcritical Extremum seeking control Power consumption CO2 heat pump Real-time optimization

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GB/T 7714 Hu, Bin , Li, Yaoyu , Wang, R. Z. et al. Real-time minimization of power consumption for air-source transcritical CO2 heat pump water heater system [J]. | INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID , 2018 , 85 : 395-408 .
MLA Hu, Bin et al. "Real-time minimization of power consumption for air-source transcritical CO2 heat pump water heater system" . | INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID 85 (2018) : 395-408 .
APA Hu, Bin , Li, Yaoyu , Wang, R. Z. , Cao, Feng , Xing, Ziwen . Real-time minimization of power consumption for air-source transcritical CO2 heat pump water heater system . | INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID , 2018 , 85 , 395-408 .
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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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Structural study on a swing compressor with no valves for air conditioning systems EI SCIE
期刊论文 | 2018 , 88 , 300-306 | INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID
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Abstract :

This paper presents a swing compressor with no valves employed in air conditioning systems. The design and work principle of this swing compressor are introduced. Compared with the conventional swing compressor, this novel swing compressor has no discharge closed volume in structure and the adiabatic indicated efficiency is 98.5%. In addition, it is a new method to use centrifugal force to separate oil and refrigerant in the exhaust cavity and the reasonable design of the oil supply system allows this novel swing compressor with no valves to be employed in air conditioning system. Overall, this swing compressors with no valves has the advantages of light weight, simpler component geometries and more suitable for application in air conditioning. (c) 2018 Elsevier Ltd and IIR. All rights reserved.

Keyword :

Oil supply system No valves Oil-refrigerant separation Swing compressor Centrifugal force

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GB/T 7714 Pan, Xi , Wang, Man , Li, Wei et al. Structural study on a swing compressor with no valves for air conditioning systems [J]. | INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID , 2018 , 88 : 300-306 .
MLA Pan, Xi et al. "Structural study on a swing compressor with no valves for air conditioning systems" . | INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID 88 (2018) : 300-306 .
APA Pan, Xi , Wang, Man , Li, Wei , Xing, Ziwen , Pan, Shulin . Structural study on a swing compressor with no valves for air conditioning systems . | INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID , 2018 , 88 , 300-306 .
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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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Abstract :

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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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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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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Investigation of characteristics of discharge pressure pulsation in a twin-screw refrigeration compressor EI Scopus
期刊论文 | 2018 | 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 , 2018 .
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 (2018) .
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 , 2018 .
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