scholarly journals Investigation of the throughput of nonlinear surge arresters using the MatLab software environment

2021 ◽  
Vol 1155 (1) ◽  
pp. 012078
Author(s):  
N M Kuznetsov ◽  
I N Morozov ◽  
S A Smirnov
Keyword(s):  
Software Environment ◽  
Matlab Software ◽  
Surge Arresters

The design of a seasonal heat storage system with a geothermal heat pump for a residential building in Tehran

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Akbar Alidadi Shamsabadi ◽  
Mehdi Jahangiri ◽  
Tayebeh Rezaei ◽  
Rouhollah Yadollahi Farsani ◽  
Ali Seryani ◽  
...  
Keyword(s):  
Heat Pump ◽  
Heating System ◽  
Coefficient Of Performance ◽  
Maximum Temperature ◽  
Software Environment ◽  
Geothermal Heat ◽  
Pump System ◽  
Matlab Software ◽  
Content Type ◽  
Heat Pump System

Purpose In this study, a solar water heating system along with a seasonal thermal energy storage and a heat pump is designed for a villa with an area of 192 m2 in Tehran, the capital of Iran. Design/methodology/approach According to the material and the area of the residential space, the required heating of the building was calculated manually and then the thermodynamic analysis of the system and simulation was done in MATLAB software. Finally, regarding the waste of system, an efficient solar heating system, providing all the required energy to heat the building, was obtained. Findings The surface area of the solar collector is equal to 46 m2, the capacity of the tank is about 2,850 m3, insulation thickness stands at 55 cm and the coefficient of performance in required heat pump is accounted to about 9.02. Also, according to the assessments, the maximum level of received energy by the collector in this system occurs at a maximum temperature of 68ºC. Originality/value To the best of the authors’ knowledge, in the present work, for the first time, using mathematical modeling and analyzing of the first and second laws of thermodynamics, as well as using of computational code in MATLAB software environment, the solar-assisted ground source heat pump system is simulated in a residential unit located in Tehran.

scholarly journals Investigation of the launch time of NH3-H2O absorption chiller under different working condition

2019 ◽  
Vol 234 (1) ◽  
pp. 15-28 ◽  
Author(s):  
A Ebrahimnataj Tiji ◽  
A Ramiar ◽  
MR Ebrahimnataj
Keyword(s):  
Working Condition ◽  
Coefficient Of Performance ◽  
Working Fluid ◽  
Liquid Temperature ◽  
Absorption Chiller ◽  
Software Environment ◽  
Matlab Software ◽  
Subcooled Liquid ◽  
Lumped Parameter ◽  
Ammonia Absorption

This study deals with the launch time of main characteristic of NH3-H 2O absorption chiller under different working condition. The aim of this work was about to scrutinize a lumped-parameter dynamic simulation of aqua-ammonia absorption chiller in addition to investigating the effect of subcooled liquid at condenser/absorber outlet on absorption chiller’s key parameters launch time. Also, the effect of ambient temperature on absorption chiller’s key parameters’ launch time is studied. In order to determine the thermodynamic properties of the working fluid, the Engineering Equation Solver software is applied. By making a link between Engineering Equation Solver and MATLAB software, the differential equations are solved in the MATLAB software environment by fourth-order Rung–Kutta method. According to the result, increase of the sub-cool liquid temperature at condenser outlet has no effect on absorption chiller’s key parameters’ launch time. Besides, 10 ℃-increase in subcooled liquid temperature at the absorber outlet leads to decreasing the launch time of the coefficient of performance to 19.35%. The result shows that if cooling tower temperature goes from 22 ℃ to 30 ℃, launch time of the coefficient of performance rises by 10.43%, while evaporator heat transfer rate falls by 30%. To validate the dynamic model, the results deduced from numerical simulation are compared with peer steady–state results.

scholarly journals Multi-Factor Analysis of External Effects Influencing the Operational Reliability of Asynchronous Electric Motors

2020 ◽  
Vol 216 ◽  
pp. 01084
Author(s):  
Victoria Romanova ◽  
Sergey Khromov ◽  
Konstantin Suslov
Keyword(s):  
Factor Analysis ◽  
Low Voltage ◽  
Operational Reliability ◽  
Electric Motors ◽  
Software Environment ◽  
External Effects ◽  
Matlab Software ◽  
Research Results ◽  
Operational Factors ◽  
Asynchronous Electric Motors

The paper considers the main issues of increasing the operational reliability of low-voltage asynchronous electric motors based on a set of studies performed using simulations in the Simulink Matlab software environment. The study defines the allowable operation of asynchronous electric motors under the influence of operational factors. We have conducted the analysis and discussion of the research results and suggested measures aiming to increase the operational reliability of asynchronous electric motors.

scholarly journals Determination of the state and functioning of the equipment of rod well pumping units in the operation process by the parameters of the wattmetrogram

2021 ◽  
Vol 23 (3) ◽  
pp. 142-154
Author(s):  
V. A. Manakhov ◽  
A. N. Tsvetkov
Keyword(s):  
Control Method ◽  
Technical Condition ◽  
Software Environment ◽  
Matlab Software ◽  
Operation Process ◽  
Amplitude Spectra ◽  
Sucker Rod ◽  
Pumping Unit ◽  
Pumping Units

TARGET. The purpose of this work is to develop a method for diagnostics of equipment of sucker rod pumping units (SRPU) during operation according to the parameters of the wattmetrogram. A wattmetering module is used as a measuring element, the developed software in the MatLab software package serves as a tool for processing vibration signals. The technical condition of the sucker rod pumping unit is analyzed by the parameters of the wattmetrogram and the amplitude spectra of the object under study, formed using the fast Fourier transform procedure in the MatLab software environment.METHODS. The wattmetering method allows you to control the sucker rod-pumping unit during its operation under voltage. This control method is highly accurate, sensitive to developing defects, and allows the use of computer technologies for signal processing and analysis.RESULTS. The wattmetering method is fully disclosed. The construction of the spectrum is considered. The relationship between the wattmetrogram and the dynamogram has been established. The removal and evaluation of experimental data from the operating sucker-rod pumping unit during its operation was carried out. A wattmetrogram and a dynamogram were built, a spectrum was also built, which showed the presence of defects in this installation.CONCLUSION. This method of wattmetering with the MatLab software allows you to monitor the technical condition of the sucker rod pumping unit according to the amplitude-frequency characteristics of the wattmetrogram parameters.

A MATLAB Software Environment for System Identification

2009 ◽  
Vol 42 (10) ◽  
pp. 741-746 ◽  
Author(s):  
Adrian Wills ◽  
Adam Mills ◽  
Brett Ninness
Keyword(s):  
System Identification ◽  
Software Environment ◽  
Matlab Software

Investigation of the Influence of Hydroimpulsive Mechanism Design Parameters on the Formed Impulse

2014 ◽  
Vol 1040 ◽  
pp. 682-685 ◽  
Author(s):  
M.V. Tsygankova
Keyword(s):  
Power Systems ◽  
Mechanism Design ◽  
Design Parameters ◽  
Software Environment ◽  
Rock Drilling ◽  
Matlab Software ◽  
Basic Diagram ◽  
Mathematic Modeling

The following article considers mathematic modeling of hydroimpulsive power systems. Using the MATLab software environment the author studies the influence of design parameters on the formed impulse. Consequently a new headless hydroimpulsive power mechanism is offered and described in detail and a basic diagram is given. This system can be used for designing new hydroimpulsive rock-drilling machines to intensify the process of drilling.

Mathematical modeling of three-phase circuits in the MatLab software environment

2019 ◽  
pp. 37-45
Author(s):  
A.V. Kupova ◽  
◽  
E.V. Lanovenko ◽  
E.B. Solovyeva ◽  
◽  
...  
Keyword(s):  
Mathematical Modeling ◽  
Software Environment ◽  
Matlab Software ◽  
Three Phase

scholarly journals Technology of Acoustic Monitoring, Detection and Localization of Objects in the Controlled Area

2020 ◽  
pp. 35-43
Author(s):  
Oleksandr Ye. Volkov ◽  
◽  
Volodimir Yu. Taranuha ◽  
Yaroslav M. Linder ◽  
Dmytro O. Volosheniuk ◽  
...  
Keyword(s):  
Sound Source ◽  
Acoustic Monitoring ◽  
Frequency Characteristics ◽  
Software Environment ◽  
Matlab Software ◽  
Detection And Localization

An algorithm for determining the distance to the sound source based on amplitude and frequency characteristics was developed. The algorithm is implemented in the Matlab software environment.

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