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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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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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R245fa高温蒸气热泵理论与实验研究 CSCD PKU
期刊论文 | 2018 , (1) , 28-33 | 制冷学报
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Abstract :

工业领域中高温蒸气的需求较大,由于小型锅炉的禁用、电锅炉的低能效及余热资源的浪费,因此高温热泵作为制取水蒸气的装置,有广阔的发展前景.本文设计了一种采用R245fa为工质的高温热泵系统与水蒸气制备装置,建立数学模型对系统及各部件进行模拟和性能预测,并搭建实验台研究其性能和运行参数随工况等的变化规律.结果表明:随着蒸发温度的上升,系统COP快速上升,相对值为0.55 ~1.3,上升速度逐渐减缓,制热量近似线性升高,排气过热度下降,换热温差显著上升;换热系数随着水流率的增加而增加,变化范围为1.7 ~2.8 kW/(m2·K).

Keyword :

蒸发温度 水蒸气 热泵 实验研究

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GB/T 7714 赵兆瑞 , 吴华根 , 邢子文 et al. R245fa高温蒸气热泵理论与实验研究 [J]. | 制冷学报 , 2018 , (1) : 28-33 .
MLA 赵兆瑞 et al. "R245fa高温蒸气热泵理论与实验研究" . | 制冷学报 1 (2018) : 28-33 .
APA 赵兆瑞 , 吴华根 , 邢子文 , 于志强 . R245fa高温蒸气热泵理论与实验研究 . | 制冷学报 , 2018 , (1) , 28-33 .
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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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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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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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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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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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