Modelling and performance evaluation of a novel disk-type liquid desiccant air dehumidifier with no film flow

2020 ◽  
Vol 29 (9) ◽  
pp. 1289-1299
Author(s):  
Yuan Wang ◽  
Yonggao Yin ◽  
Fan Zhang ◽  
Yue Lyu
Keyword(s):  
High Efficiency ◽  
Film Flow ◽  
Rotation Speed ◽  
Solution Concentration ◽  
Immersion Depth ◽  
Solution Temperature ◽  
Liquid Desiccant ◽  
Humidity Ratio ◽  
Stage Number ◽  
And Performance

A liquid desiccant air dehumidifier (LDAD) with both high efficiency and low desiccant carryover is of vital significance to indoor environment. However, the instability introduced by desiccant film flow tends to deteriorate the droplets entrainment in product air and remains to be solved. In this study, a novel disk-type liquid desiccant air dehumidifier with no film flow (DLDAD) was developed to radically eliminate the apparent desiccant film flow. The distribution and refreshing of liquid desiccant on wetted surface is realized by the rotation of the disks rather than the film flow of liquid desiccant. The performance of DLDAD was numerically evaluated under varied dehumidifier parameters, including stage number, immersion depth, rotation speed and air and solution parameters. The results show that an increase in the stage number can increase dehumidification performance, ensuring the air outlet humidity ratio below 10 g/kg. The dimensionless immersion depth of 0.4 and the rotation speed of 3 r/min are suggested for better dehumidification performance in this case. Increasing solution concentration or decreasing solution temperature can effectively reduce the air outlet humidity ratio. All these results can support the structural design and practical application for LDADs with higher efficiency and lower desiccant carryover in the future.

Experimental Analysis of Effects of Non-Structural Factors on Performance of Liquid-Gas Ejector Driven by Aqueous LiBr Solution

2013 ◽  
Vol 732-733 ◽  
pp. 472-475
Author(s):  
Rui Wang ◽  
Hong Tao Gao
Keyword(s):  
Experimental Analysis ◽  
High Efficiency ◽  
Optimal Solution ◽  
Solution Concentration ◽  
Back Pressure ◽  
Solution Temperature ◽  
Structural Factors ◽  
Evaporator Temperature ◽  
Libr Solution ◽  
Aqueous Lithium Bromide

Miniaturization and high-efficiency plays an important role in the further development of absorption refrigeration. In order to improve the mass transfer efficiency, liquid-gas ejector is intended to be used in refrigeration system. Experimental analysis of effects of non-structural factors on Liquid-Gas Ejector driven by aqueous LiBr solution is presented. Solution concentration, solution temperature, evaporator temperature and back pressure are varied to analyze the ejector performance. The results show that the large difference between refrigerant vapor pressure and partial pressure of solution enhances absorption of water into aqueous lithium bromide solution. The optimal solution concentration range is 56.61wt%~57.61wt% when the throat diameter of convergent-divergent nozzle is 1.5mm. Cooling capacity increases with the decreasing of back pressure.

scholarly journals On Performance of Sparse Fast Fourier Transform Algorithms Using the Aliasing Filter

Electronics ◽  
2021 ◽  
Vol 10 (9) ◽  
pp. 1117
Author(s):  
Bin Li ◽  
Zhikang Jiang ◽  
Jie Chen
Keyword(s):  
Fourier Transform ◽  
Fast Fourier Transform ◽  
High Efficiency ◽  
Theory And Practice ◽  
Long Time ◽  
And Performance ◽  
Binary Tree Search ◽  
The One ◽  
Sparse Fast Fourier Transform ◽  
L1 And L2

Computing the sparse fast Fourier transform (sFFT) has emerged as a critical topic for a long time because of its high efficiency and wide practicability. More than twenty different sFFT algorithms compute discrete Fourier transform (DFT) by their unique methods so far. In order to use them properly, the urgent topic of great concern is how to analyze and evaluate the performance of these algorithms in theory and practice. This paper mainly discusses the technology and performance of sFFT algorithms using the aliasing filter. In the first part, the paper introduces the three frameworks: the one-shot framework based on the compressed sensing (CS) solver, the peeling framework based on the bipartite graph and the iterative framework based on the binary tree search. Then, we obtain the conclusion of the performance of six corresponding algorithms: the sFFT-DT1.0, sFFT-DT2.0, sFFT-DT3.0, FFAST, R-FFAST, and DSFFT algorithms in theory. In the second part, we make two categories of experiments for computing the signals of different SNRs, different lengths, and different sparsities by a standard testing platform and record the run time, the percentage of the signal sampled, and the L0, L1, and L2 errors both in the exactly sparse case and the general sparse case. The results of these performance analyses are our guide to optimize these algorithms and use them selectively.

Advances in coupled axial turbine and nonaxisymmetric exhaust volute aerodynamics for turbomachinery

2020 ◽  
pp. 095441002096645
Author(s):  
Jie Gao ◽  
Chunde Tao ◽  
Dongchen Huo ◽  
Guojie Wang
Keyword(s):  
Performance Improvement ◽  
High Efficiency ◽  
Three Dimensional ◽  
Great Influence ◽  
Aerodynamic Characteristics ◽  
Turbine Engines ◽  
Gas Turbine Engines ◽  
Axial Turbine ◽  
Flow Interactions ◽  
And Performance

Marine, industrial, turboprop and turboshaft gas turbine engines use nonaxisymmetric exhaust volutes for flow diffusion and pressure recovery. These processes result in a three-dimensional complex turbulent flow in the exhaust volute. The flows in the axial turbine and nonaxisymmetric exhaust volute are closely coupled and inherently unsteady, and they have a great influence on the turbine and exhaust aerodynamic characteristics. Therefore, it is very necessary to carry out research on coupled axial turbine and nonaxisymmetric exhaust volute aerodynamics, so as to provide reference for the high-efficiency turbine-volute designs. This paper summarizes and analyzes the recent advances in the field of coupled axial turbine and nonaxisymmetric exhaust volute aerodynamics for turbomachinery. This review covers the following topics that are important for turbine and volute coupled designs: (1) flow and loss characteristics of nonaxisymmetric exhaust volutes, (2) flow interactions between axial turbine and nonaxisymmetric exhaust volute, (3) improvement of turbine and volute performance within spatial limitations and (4) research methods of coupled turbine and exhaust volute aerodynamics. The emphasis is placed on the turbine-volute interactions and performance improvement. We also present our own insights regarding the current research trends and the prospects for future developments.

scholarly journals Numerical modeling and performance analysis of a membrane-based air dehumidifier using ionic liquid desiccant

2020 ◽  
Vol 175 ◽  
pp. 115395 ◽  
Author(s):  
Xiaoli Liu ◽  
Ming Qu ◽  
Xiaobing Liu ◽  
Lingshi Wang ◽  
Joseph Warner
Keyword(s):  
Numerical Modeling ◽  
Ionic Liquid ◽  
Performance Analysis ◽  
Liquid Desiccant ◽  
And Performance

Fabrication, characterizations and performance of a high-efficiency micro-electrolysis filler for isobutyl xanthate (IBX) degradation

2021 ◽  
Vol 403 ◽  
pp. 123640
Author(s):  
Shuzhen Yang ◽  
Huina Sun ◽  
Shengpeng Su ◽  
Guihong Han ◽  
Yanfang Huang
Keyword(s):  
High Efficiency ◽  
And Performance

scholarly journals Pipeline Compressor Redesign With the Consideration of Both Noise and Performance

2000 ◽  
Author(s):  
Yuri I. Biba ◽  
Zheji Liu ◽  
D. Lee Hill
Keyword(s):  
High Efficiency ◽  
Aerodynamic Characteristics ◽  
The Body ◽  
Design Parameters ◽  
Original Design ◽  
Tonal Noise ◽  
Experimental Performance ◽  
Expected Performance ◽  
Computational Fluid Dynamics Cfd ◽  
And Performance

A complete effort to redesign the aerodynamic characteristics of a single-stage pipeline compressor is presented. The components addressed are the impeller, diffuser region, and the volute. The innovation of this effort stems from the simultaneous inclusion of both the noise and aerodynamic performance as primary design parameters. The final detailed flange-to-flange analysis of the new components clearly shows that the operating range is extended and the tonal noise driven by the impeller is reduced. This is accomplished without sacrificing the existing high efficiency of the baseline machine. The body of the design effort uses both Computational Fluid Dynamics (CFD) and vibro-acoustics technology. The predictions are anchored by using the flange-to-flange analysis of the original design and its experimental performance data. By calculating delta corrections and assuming that these deltas are approximately the same for the new design, the expected performance is extrapolated.

scholarly journals INFLUENCE EXTERNAL INFLUENCES ON THE ACCURACY OF TEMPERATURE CONCRETE FEATURES AND PERFORMANCE MEASUREMENT WITH INFRARED TECHNOLOGY IN THE AGING MONOLITHIC STRUCTURES

2017 ◽  
Vol 2 (3) ◽  
pp. 57-65
Author(s):  
Антохин ◽  
Pavel Antokhin ◽  
Дьяконов ◽  
Igor Dyakonov
Keyword(s):  
Measurement Errors ◽  
High Efficiency ◽  
Technological Development ◽  
Infrared Technology ◽  
Concrete Temperature ◽  
Allowable Range ◽  
Processing Information ◽  
And Performance ◽  
Definition Of ◽  
Monolithic Structures

At the present stage of technological development, where low labor intensity are highly valued, high efficiency and representativeness of measurements, a convenient means of storing and processing information, the infrared (IR) thermometry recaptures more and more space. The exact definition of the concrete temperature (with an error of 1 °C or less, usually defined by the sensor) is extremely complicated: Instrumental errors superimposed on the error measurement method used, on the errors associated with the arrangement of the measurement sites, etc. In relative terms, the rates of heating-cooling, in the absolute, the range of allowed temperatures when exposed concrete such accuracy looks obviously excessive and unjustified technically and economically. Considering the IR technique as a means postroechnyh control the concrete temperature, and when performing measurements using its implementation should be tailored to suit the IR measurements and factors that can lead to significant measurement errors. Since these factors can greatly affect the measurement result. Reliability indirect MOTB (method of determining the temperature of the concrete) with pyrometers is achieved by using the calculated accurate according to a certain type of decks and compliance with the measurement rules to ensure the work of this relationship within the allowable range of accuracy.

scholarly journals Performance Analysis of Brushless DC Motor Using Modified Queen Bee Evolution Based Genetic Algorithm Tuned PI Controller under Different Speed Conditions

2020 ◽  
pp. 1-10
Author(s):  
Ankit Rawat ◽  
Mohd Fazle Azeem
Keyword(s):  
Performance Analysis ◽  
High Efficiency ◽  
Mechanical Load ◽  
Model Performance ◽  
Bldc Motor ◽  
Brushless Dc ◽  
Compact Size ◽  
And Performance ◽  
Domestic Appliance ◽  
Motor Drive System

The modeling of BLDC motor and performance analysis under diverse operating speed settings has been presented in this paper. BLDC motors gaining more & more attention from different Industrial and domestic appliance manufacturers due to its compact size, high efficiency and robust structure. Voluminous research and developments in the domains of material science and power electronics led to substantial increase in applications of BLDC motor to electric drives. This paper deals with the modeling of BLDC motor drive system along with a comparative study of modified queens bee evolution based GA tuned & manually tuned control schemes using MATLAB /SIMULINK. In order to evaluate the performance of proposed drive, simulation is carried out at different Mechanical load & speed conditions. Test outcomes thus achieved show that the model performance is satisfactory.

scholarly journals EVALUATION OF THE PROFITABILITY AND PERFORMANCE OF YOUTH PARTICIPATION IN CASHEW NUT (ANACARDIUM OCCIDENTALE) MARKETING IN ANKPA LOCAL GOVERNMENT AREA OF KOGI STATE, NIGERIA

2018 ◽  
Vol 2 (1) ◽  
pp. 49
Author(s):  
Adeio P.E ◽  
Adejo E.G ◽  
Zakari J
Keyword(s):  
Local Government ◽  
Market Integration ◽  
High Efficiency ◽  
Local Government Area ◽  
Youth Participation ◽  
Primary Data ◽  
Gross Margin ◽  
Cashew Nut ◽  
Marketing Efficiency ◽  
And Performance

This study assessed youth participation in cashew nut marketing in Ankpa Local Government Area of Kogi State, Nigeria. It specifically described the socioeconomic characteristics of the youths, examined the profitability of youth involvement in cashew nut marketing, assessed the efficiency and performance of youth in cashew nut marketing, and determined the level of market integration in cashew nut marketing. A three staged random sampling method was used to select 120 youth involved in cashew nut marketing for the study. Relevant primary data obtained through structured questionnaire were analysed using descriptive statistics, gross margin model, marketing efficiency, and Pearson price correlation. Findings of the study showed a mean age and marketing experience of 37 years and 10 years respectively. Gross margin obtained was N 445, 563.90 per annum, N14, 811.11 per bag and N185.11per kg with a high efficiency level of 654%. The level of integration (0.415) between Awo and Enjema markets was significant 5%. Youth are encouraged to consider cashew nut marketing as an option to reduce unemployment and improve their welfare. 

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