scholarly journals Numerical Optimization of Drying Energy Consumption from Multiple Jets Impinging on a Moving Curved Surface

2021 ◽  
Vol 39 (3) ◽  
pp. 755-762
Author(s):  
Ali Chitsazan ◽  
Georg Klepp ◽  
Birgit Glasmacher ◽  
Kamyar Mohammad Pour
Keyword(s):  
Energy Consumption ◽  
Turbulence Model ◽  
Search Algorithm ◽  
Specific Energy Consumption ◽  
Surface Velocity ◽  
Design Parameters ◽  
Optimal Point ◽  
Inlet Velocity ◽  
Surface Distance ◽  
Data Points

Due to the increasing energy cost, the efficiency of the industrial dryer as the energy-intensive processes should be improved. The designer should optimize the design parameters of industrial drying equipment to achieve the minimum drying energy consumption. SST k-ω turbulence model is used to simulate a real geometry for industrial drying applications. For the optimization of the impinging round jet, the specific drying energy consumption is set as the objective function to be minimized. The jet to surface distance, jet to jet spacing, jet inlet velocity, jet angle, and surface velocity are chosen as the design parameters. The SHERPA search algorithm is used to search for the optimal point from the weighted sum of all objectives method. One correlation is developed and validated for the specific drying energy consumption. It is found that the SST k-ω turbulence model succeeded with reasonable accuracy in reproducing the experimental results. The minimum specific energy consumption correlates with high values of the jet to jet spacing, jet angle, and surface velocity and low values of the nozzle to surface distance and jet inlet velocity. The agreement in the prediction of the specific drying energy consumption between the numerical simulation and correlation is found to be reasonable and all the data points deviate from the correlation by less than 7%.

scholarly journals Numerical Optimization of Heat Transfer from Multiple Jets Impinging on a Moving Curved Surface for Industrial Drying Machines

2021 ◽  
Vol 39 (1) ◽  
pp. 32-40
Author(s):  
Ali Chitsazan ◽  
Georg Klepp ◽  
Birgit Glasmacher
Keyword(s):  
Heat Transfer ◽  
Turbulence Model ◽  
Transfer Rate ◽  
Curved Surface ◽  
Surface Velocity ◽  
Design Parameters ◽  
Maximum Heat ◽  
Inlet Velocity ◽  
Surface Distance ◽  
Multiple Jets

Jet impingements enhance the heat and mass transfer rate in industrial drying machines. The designer should optimize the design parameters of industrial drying equipment to achieve maximum heat transfer rate. The heat transfer between multiple jets and a moving curved surface is more difficult to study due to the changing boundaries and the effect of surface curvature but is also very relevant in industrial drying applications. SST k-ω turbulence model is used to simulate a real geometry for industrial drying applications. The SST k-ω turbulence model succeeded with reasonable accuracy in reproducing the experimental results. The jet to surface distance, jet to jet spacing, jet inlet velocity, jet angle, and surface velocity are chosen as the design parameters. For the optimization of the impinging round jet, the average Nu number on the moving curved surface is set as the objective functions to be maximized. The SHERPA search algorithm is used to search for the optimal point from the weighted sum of all objectives method. One correlation is developed and validated for the average Nu number. It is found that the maximum average Nu number correlates with high values of jet inlet velocity (Vj), jet angle (θ) and jet to jet spacing (S/d) and low values of the jet to surface distance (H/d) and relative surface velocity (VR). The agreement in the prediction of the average Nu number between the numerical simulation and correlation is found to be reasonable and all the data points deviate from the correlation by less than 4%.

scholarly journals Specific Energy Consumption of a Belt Conveyor System in a Continuous Surface Mine

Energies ◽  
2020 ◽  
Vol 13 (19) ◽  
pp. 5214 ◽  
Author(s):  
Witold Kawalec ◽  
Natalia Suchorab ◽  
Martyna Konieczna-Fuławka ◽  
Robert Król
Keyword(s):  
Energy Consumption ◽  
Specific Energy ◽  
Specific Energy Consumption ◽  
Electric Energy ◽  
Transportation System ◽  
Transportation Systems ◽  
Open Pit ◽  
Design Parameters ◽  
Belt Conveyor ◽  
Electric Energy Consumption

Belt conveyor (BC) transportation systems are considered to be the most effective for handling large volumes of bulk material. With regards to the rules of sustainable development, the improvement of belt conveyor technology is, in many cases, focused on environmental issues, which include the idea of energy usage optimization. The key issue in an energy-efficient transportation system is reducing the value of specific energy consumption (SEC) by increasing conveyor capacity whilst decreasing belt conveyor motion resistance. The main idea of this paper is to conduct an analysis of the modernization of existing belt conveyor transportation systems operated in open-pit lignite mines, in order to achieve relatively small electric energy consumption for a considered transportation task. The first part of the paper investigates the relationship between a conveyor’s SEC and material flow rate for various conveyor design parameters. Then, based on multi-parameter simulations, an analysis of electric energy consumption for a belt conveyor transportation system is carried out. Finally, an energy-saving, environmentally friendly solution is presented.

scholarly journals Model Based Simulation and Genetic Algorithm Based Optimisation of Spiral Wound Membrane RO Process for Improved Dimethylphenol Rejection from Wastewater

Membranes ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 595
Author(s):  
Mudhar A. Al-Obaidi ◽  
Alejandro Ruiz-García ◽  
Ghanim Hassan ◽  
Jian-Ping Li ◽  
Chakib Kara-Zaïtri ◽  
...  
Keyword(s):  
Genetic Algorithm ◽  
Energy Consumption ◽  
Specific Energy ◽  
Specific Energy Consumption ◽  
Operating Conditions ◽  
Design Parameters ◽  
Channel Height ◽  
Model Based ◽  
Feed Channel ◽  
Membrane Design

Reverse Osmosis (RO) has already proved its worth as an efficient treatment method in chemical and environmental engineering applications. Various successful RO attempts for the rejection of organic and highly toxic pollutants from wastewater can be found in the literature over the last decade. Dimethylphenol is classified as a high-toxic organic compound found ubiquitously in wastewater. It poses a real threat to humans and the environment even at low concentration. In this paper, a model based framework was developed for the simulation and optimisation of RO process for the removal of dimethylphenol from wastewater. We incorporated our earlier developed and validated process model into the Species Conserving Genetic Algorithm (SCGA) based optimisation framework to optimise the design and operational parameters of the process. To provide a deeper insight of the process to the readers, the influences of membrane design parameters on dimethylphenol rejection, water recovery rate and the level of specific energy consumption of the process for two different sets of operating conditions are presented first which were achieved via simulation. The membrane parameters taken into consideration include membrane length, width and feed channel height. Finally, a multi-objective function is presented to optimise the membrane design parameters, dimethylphenol rejection and required energy consumption. Simulation results affirmed insignificant and significant impacts of membrane length and width on dimethylphenol rejection and specific energy consumption, respectively. However, these performance indicators are negatively influenced due to increasing the feed channel height. On the other hand, optimisation results generated an optimum removal of dimethylphenol at reduced specific energy consumption for a wide sets of inlet conditions. More importantly, the dimethylphenol rejection increased by around 2.51% to 98.72% compared to ordinary RO module measurements with a saving of around 20.6% of specific energy consumption.

scholarly journals Improving the quality of milk dispersion in a counter-jet homogenizer

10.5219/1407 ◽  
2020 ◽  
Vol 14 ◽  
pp. 633-640
Author(s):  
Kyrylo Samoichuk ◽  
Dmytro Zhuravel ◽  
Nadiya Palyanichka ◽  
Vadim Oleksiienko ◽  
Serhii Petrychenko ◽  
...  
Keyword(s):  
Energy Consumption ◽  
Specific Energy ◽  
Milk Fat ◽  
Specific Energy Consumption ◽  
Experimental Studies ◽  
Average Diameter ◽  
Optical Microscope ◽  
Design Parameters ◽  
Fat Globules

Homogenization is a necessary process in the production of drinking milk and most dairy products. The specific energy consumption of the most common valve homogenizers reaches 8 kW h.t-1. A promising way to reduce it is the introduction of more effective counter-jet homogenizers. The purpose of these studies is to increase the efficiency of machines of this type through fuller use of their kinetic energy. To achieve this, the design of a ring reflector was developed and experimental studies were carried out to determine its influence on the efficiency of milk fat dispersion in a counter-jet homogenizer. Calculations were made to determine the reflector’s design parameters. An installation for experimental research has been developed, in which the required milk pressure is created with the help of compressed carbon dioxide. The dispersive indices of the milk emulsion were determined by computer analysis of milk sample micrographs obtained with an optical microscope and a digital camera using Microsoft Office Excel and Microsoft Visual Studio C# software using the OpenCV Sharp library. As a result of research, the formula for defining the angle of the reflector top has been determined analytically. Experimental studies proved its validity and allowed determination of the optimal diameter. A comparison of the dependence of the degree of homogenization on the excess pressure in a counter-jet homogenizer proves a 15 – 20% increase in the degree of dispersion when using a reflector. At the same time, specific energy consumption does not increase. Comparison of the distribution curves of milk fat globules by size after counter-jet homogenization and homogenization with a reflector suggests that the average diameter of fat globules for the experimental method decreases from 0.99 to 0.83 μm. This indicates the high quality of the dispersal characteristics of the milk emulsion after processing in a counter-jet homogenizer with a reflector.

scholarly journals Analysis of Energy Consumption during Plowing Using a Motor-Block with Moldboard Plow

2019 ◽  
Vol 29 (3) ◽  
pp. 414-427
Author(s):  
Vladimir F. Kupryashkin ◽  
Aleksandr S. Ulanov ◽  
Nikolay I. Naumkin ◽  
Anatoliy V. Bezrukov ◽  
Michail G. Shlyapnikov
Keyword(s):  
Energy Consumption ◽  
Power Consumption ◽  
Specific Energy ◽  
Crop Production ◽  
Motor Block ◽  
Specific Energy Consumption ◽  
Traction Force ◽  
Design Parameters ◽  
Resistance Force ◽  
Moldboard Plow

Introduction. Plowing the soil is a major operation in the cultivation of crops. It is one of the most labor-intensive operations in crop production, accounting for about 40 % of all energy costs. Most of these costs fall on consumed power, ensuring the effective functioning of the motor-block unit with a moldboard plow. Therefore, estimation of power consumed by motor-blocks is the urgent task. Materials and Methods. To solve the problem of determining the energy characteristics of the motor-block unit during plowing, a theoretical analysis was carried out, including values of torque, traction force on running wheels, resistance during their rolling and resistance force at the jointers-depleted plow, with the account for the geometry of the plowing unit based on the motor-block. Dependences of power consumption and specific energy consumption were obtained using the method described below. Results.As a result of our analysis of the power balance, we obtained dependences to find power consumption, as well as the specific energy intensity of plowing the soil with a motor-moldboard plow, which allowed for energy assessment of the functioning of the agricultural unit. Discussion and Conclusion. On the basis of these dependences of the required power and specific energy consumption, taking into account experimental data on interaction of the plow with the soil, design parameters and technological modes of operation of the agricultural unit consisting of motor unit Neva MB-2S-7,5 Pro and plow P1-20/3, were obtained to facilitate the choice of optimal modes of their functioning.

scholarly journals MODEL OF THE TECHNOLOGICAL PROCESS FUNCTIONING OF POST-TREATMENT PROCESSING OF GRAIN IN THE RECEPTION AND PRELIMINARY CLEANING DEPARTMENT OF GRAIN PORES

2018 ◽  
Vol 13 (4) ◽  
pp. 114-118 ◽  
Author(s):  
Николай Кузнецов ◽  
Nikolay Kuznecov ◽  
Николай Пушкаренко ◽  
Nikolay Pushkarenko ◽  
Владимир Медведев ◽  
...  
Keyword(s):  
Energy Consumption ◽  
Technological Process ◽  
Specific Energy Consumption ◽  
Weather Conditions ◽  
Design Parameters ◽  
Significant Heterogeneity ◽  
Post Harvest ◽  
Operating Modes ◽  
Temporary Storage ◽  
Grain Contamination

At present, in many regions of the Russian Federation, post-harvest processing of grain is carried out directly on the farms themselves. Produced grain is mainly used for fodder and seed purposes. This is predetermined by difficult weather conditions, and freshly harvested grain is fed to the post-harvest treatment unevenly, it has high humidity and debris, a significant heterogeneity of seeds by ripeness. Machines and equipment of grain cleaning and drying stations and complexes do not fully comply with the properties of the grain pile, which leads to a decrease in their throughput, disruption of processing, the accumulation of large masses of raw grain heap, lengthening the time of harvest, increased losses and reduced quality seeds. Reception and temporary storage of a pile of grain in aerated receiving bunkers with forced ventilation of the pile causes an improvement in the technological properties of the seeds, a decrease in humidity and grain contamination. The use of aerated bunkers for receiving and temporary storage of a grain heap, increase the energy consumption for grain cleaning and heating of the heap. The reduction of specific energy consumption for the operation “Reception of a grain heap” is possible by optimizing both the design parameters and the operating modes of aerated bunkers. The research of the authors showed that the preliminary drying of the grain heap can improve the productivity of the heap cleaner, improve the flowability of the grain pile, the working conditions of the gravity flow devices and the quality of the preliminary cleaning of the grain. The inclusion of the heat generator in the technology of post-harvest processing of grain and the use of heated air in the operations of receiving and pre-cleaning the grain leads to a decrease in the moisture content and grain contamination, an increase in the supply of heap of grain, as well as to the intensification of subsequent technological operations. The paper presents a model of the functioning of the technological process of post-harvest grain processing in the receiving and pre-cleaning unit of the grain pile.

scholarly journals A Theoretical Method for Efficient Design of Power Tiller Rotavator Satisfying Multiple Objectives

2020 ◽  
pp. 107-115
Author(s):  
Jyotirmay Mahapatra ◽  
Vinita Kashyap ◽  
Ajay Kumar Sharma
Keyword(s):  
Energy Consumption ◽  
Specific Energy ◽  
Velocity Ratio ◽  
Specific Energy Consumption ◽  
Design Parameters ◽  
Soil Conditions ◽  
Specific Work ◽  
Kinematic Parameters ◽  
Efficient Operation ◽  
Power Tiller

Several advantages of rotavator including negative draft generation make it the most suitable attachment to power tiller. Many factors affect the economy and performance of power tiller which includes specific energy consumption, resourceful use of available power, produced soil conditions and blade durability. Hence a systematic design method was developed for power tiller rotavator while considering all these factors simultaneously. Specific work done by rotavator was equalized with performable work of power tiller for different combination of design and kinematics parameter. The value of design and kinematic parameters included in the previous step were limited by the extremities. These limitations were imposed so as to get desired soil conditions and blade durability. The best combination of parameters that produces the desired soil condition with minimum specific energy consumption while utilizing the available power resourcefully was selected. Other design parameters were calculated using parameters from the selected combination. Rotavator design and kinematic parameters satisfying the above objectives were calculated and found to be velocity ratio of 5.12, forward velocity of 0.41 m/s, rpm of 80.19, operating width of 7.5dm and 30 number of blades mounted in 5 number of flanges. This method of optimisation can be adopted for improved power tiller rotavator design and efficient operation. But as this method is purely theoretical; practical verification of the design is essential before adopting for large scale industrial production.

scholarly journals Parametric Optimization of Belt Conveyors by Energy Efficiency Criterion

2021 ◽  
pp. 50-58
Author(s):  
O. S Kuropiatnyk
Keyword(s):  
Energy Consumption ◽  
Specific Energy ◽  
Specific Energy Consumption ◽  
Design Parameters ◽  
Belt Conveyor ◽  
Belt Speed ◽  
Optimal Value ◽  
Optimal Values ◽  
Belt Conveyors ◽  
Belt Width

Purpose. The purpose of this work is to substantiate the optimal values of the belt conveyor parameters, at which the specific energy consumption for the cargo transportation takes on the lowest value. Methodology. The substantiation of the optimal values of the belt conveyor parameters was carried out by minimizing the function of specific energy consumption, which represents the energy consumption for the transportation of a cargo weighing 1 kg at a distance of 1 m. In the course of research, the drive force was determined using the contour bypass meth-od. In this case, the specific loads from the transported cargo, belt and roller supports were presented as functions of the belt width. To establish the optimal values of the conveyor productivity and belt speed, the belt width was presented as a function of these values, taking into account the physical and mechanical properties of the transported cargo, the design features of the roller supports and the belt angle. Findings. I obtained the dependences of specific energy consumption on the design parameters of the conveyor. Their analysis made it possible to identify the opti-mal values of the belt width, conveyor productivity, belt speed, and the optimal ratio of the last two values for dif-ferent types of transported cargo. It is noted that the results obtained can be supplemented by carrying out calcula-tions according to the formula given in this work. It has been established that the optimal value of the belt width depends only on the belt angle and on the coefficients that determine the energy losses, in particular the movement resistance coefficient of the belt; the influence of the specified coefficient increases with an increase in the belt angle. In addition, the optimal value of the belt width does not depend on the conveyor length, its productivity and belt speed. Originality. The dependences of the specific energy consumption on the design parameters of the belt conveyor were obtained, which made it possible to establish the optimal values of the belt width and the ratio of the conveyor productivity to the belt speed. Practical value. The results of this work can be used in the design of energy-efficient belt conveyors, which are characterized by the lowest specific energy consumption for cargo transportation.

Sign in / Sign up

Export Citation Format

Share Document