scholarly journals The influence of climatic conditions on the efficiency of the solar system

2020 ◽  
Vol 167 ◽  
pp. 05002
Author(s):  
Viacheslav Shemelin ◽  
Tomas Matuska
Keyword(s):  
Solar System ◽  
Solar Collector ◽  
Simulation Analysis ◽  
Climatic Conditions ◽  
Simulation Software ◽  
Hot Water ◽  
Apartment Building ◽  
Time Step ◽  
Simulation Results ◽  
One Year

The simulation analysis of the solar hot water preparation system for an apartment building is presented. The analyses investigated the effect of climatic conditions on the efficiency of the solar system. To demonstrate the influence of climatic conditions, four building locations (Stockholm, Prague, Milan, and Barcelona), six different solar collectors, and six different design areas of solar collector field were used. The aim was to verify how the efficiency of the solar system varies depending on the climatic and design conditions. Moreover, the influence of year-to-year fluctuations of climatic conditions was also explored. The analysis has been provided by using TRNSYS simulation software over the period of one year using the time step of 2 minutes. The simulation results clearly showed that the efficiency of the SDHW system is dependent on the climatic conditions, especially on the air temperature. On the other hand, year-to-year weather fluctuations do not strongly affect the efficiency of the SDHW system.

scholarly journals A COMPARISON OF THE THERMODYNAMIC EFFICIENCY OF VACUUM TUBE AND FLAT PLATE SOLAR COLLECTOR SYSTEMS / VAKUUMINIŲ IR PLOKŠČIŲJŲ SAULĖS KOLEKTORIŲ SISTEMŲ EKSERGINIŲ EFEKTYVUMŲ PALYGINIMAS

2013 ◽  
Vol 5 (4) ◽  
pp. 404-409 ◽  
Author(s):  
Juozas Bielskus ◽  
Karolis Januševičius ◽  
Vytautas Martinaitis
Keyword(s):  
Solar Collector ◽  
Energy Demand ◽  
Hot Water ◽  
Thermodynamic Efficiency ◽  
Thermal Systems ◽  
Time Step ◽  
Vacuum Tube ◽  
Climate Conditions ◽  
One Year ◽  
Flat Plate Solar Collector

The article presents simulation based exergy analysis used for comparing solar thermal systems applied for preparing domestic hot water. The simulation of flat and vacuum tube solar collector systems was performed in TRNSYS simulation environment. A period of one year under Lithuanian climate conditions was chosen. Simulation was performed on 6 min time step resolution by calculating energy and exergy flows and creating balance calculation. Assessment results at system and element levels have been presented as monthly variation in efficiency. The conducted analysis has revealed that the systems designed to cover equal heat energy demand operates in different exergetic efficiencies. Article in Lithuanian. Santrauka Straipsnyje eksergijos požiūriu nagrinėjamos dvi saulės kolektorių sistemos, skirtos karštam vandeniui gaminti. Plokščiųjų ir vakuuminių saulės kolektorių modeliavimas atliktas TRNSYS programa. Modeliuota vienerių metų periodui Lietuvos klimatinėmis sąlygomis 6 minučių laiko žingsniu skaičiuojant energijos ir eksergijos srautus kiekvienam laiko žingsniui ir sudarant energinius ir ekserginius balansus. Sistemos ir posistemių efektyvumo rodiklių kitimo rezultatai pateikti grafiškai. Išanalizavus akivaizdu, kad pasirinktomis sąlygomis plokščiųjų ir vakuuminių saulės kolektorių sistemos, turinčios tą pačią funkcinę paskirtį, veikia skirtingu efektyvumu.

scholarly journals Impact of Modeling Simplifications on Lightning Strike Simulation for Aeroengine

2019 ◽  
Vol 2019 ◽  
pp. 1-11
Author(s):  
Yi-fan Qian ◽  
Zhi-feng Ye ◽  
Hai-bo Zhang
Keyword(s):  
Simulation Analysis ◽  
Simulation Software ◽  
Simplified Model ◽  
Lightning Strike ◽  
Electromagnetic Simulation ◽  
Experimental Conditions ◽  
Turbofan Engine ◽  
Engine Model ◽  
Simulation Results ◽  
The Difference

With the development of electromagnetic simulation software and affordable hardware, it is allowed for us to complete simulations for EMC purposes. However, simulation demands will be immense when simulations for models with complex structures, especially aircraft components, have to be solved. Hence, it is meaningful to investigate how to minimize the computational demands. One of the solutions to reduce the simulation expense is the simplification for the simulated model. But the simplified model should be guaranteed to provide credible simulation results which do not deviate from the original model apparently. Generally, the difference between the simulation results and experimental data is estimated, or if the experimental conditions are not achieved, the comparison between the simplified model and the original one has to be analyzed, at least. This paper explores the electromagnetic simulation of a turbofan engine encountering lightning strike. With the simplifications of different components on the turbofan engine, the influences on induced currents of engine controller cables are simulated and analyzed based on the transmission-line matrix method. A combining method of components removal and geometric structure simplification is proposed to simplify the whole engine model. Simplified components include compressor, combustion chamber, turbine, and nozzle. The effects of different simplification methods are quantified, and the rationality of the simplified model is verified by simulation analysis.

A Software Optimization of the Solar Energy System Performance

2014 ◽  
Vol 899 ◽  
pp. 199-204
Author(s):  
Lukáš Skalík ◽  
Otília Lulkovičová
Keyword(s):  
Solar System ◽  
Solar Energy ◽  
System Performance ◽  
Solar Collector ◽  
Energy Demand ◽  
Fossil Fuels ◽  
Thermal Protection ◽  
Energy Systems ◽  
Energy System ◽  
Hot Water

The energy demand of buildings represents in the balance of heat use and heat consumption of energy complex in the Slovak national economy second largest savings potential. Their complex energy demands is the sum of total investment input to ensure thermal protection and annual operational demands of particular energy systems during their lifetime in building. The application of energy systems based on thermal solar systems reduces energy consumption and operating costs of building for support heating and domestic hot water as well as savings of non-renewable fossil fuels. Correctly designed solar energy system depends on many characteristics, i. e. appropriate solar collector area and tank volume, collector tilt and orientation as well as quality of used components. The evaluation of thermal solar system components by calculation software shows how can be the original thermal solar system improved by means of performance. The system performance can be improved of more than 31 % than in given system by changing four thermal solar system parameters such as heat loss coefficient and aperture area of used solar collector, storage tank volume and its height and diameter ratio.

scholarly journals Analysis of the Solar Collectors Installation on a Roof of the Small Public Building in Poland, Lithuania and Spain—A Case Study

Proceedings ◽  
2018 ◽  
Vol 2 (20) ◽  
pp. 1272 ◽  
Author(s):  
Dorota Anna Krawczyk ◽  
Mirosław Żukowski ◽  
Antonio Rodero ◽  
Ruta Bilinskiene
Keyword(s):  
Solar Radiation ◽  
Tilt Angle ◽  
Solar Collector ◽  
Simulation Software ◽  
Hot Water ◽  
Government Support ◽  
Office Building ◽  
Radiation Balance ◽  
Solar Collectors

A solar collector market is most European countries is at the stage of continuous development, however its expansion rate differs. It shows that much more factors than only the local solar radiation is important, including a technology progress, costs, local manufactures’ engagement, an economic government support or an environmentally consciousness raising relevant to a mitigating climate change. We conducted the analysis for a public office building, with a few toilets and a social room, used by 54 people. As a primary heat source for HVAC and DHW systems an oil boiler was used, whereas solar collectors were considered as an energy source for hot water preparation. The analysis was conducted for three locations of the building: Bialystok (Poland), Cordoba (Spain) and Kaunas (Lithuania), using a simulation software delivered within the framework of VIPSKILLS project. Theoretical hot water consumption was considered as 3–7 dm3/(day person) in compliance with national recommendations. It was found that beam solar radiation share in a total radiation balance was nearly twice higher in Cordoba than in Bialystok or Kaunas. The highest efficiency (44%) was estimated in Cordoba for solar collectors installed with the tilt angle between 45–50°. In case of Bialystok and Kaunas the efficiency was lower than in Cordoba and nearly equal 40–41% and the recommended tilt angle was in a range 30– 45°.

Pension reform with variable retirement age: a simulation analysis for Germany

2012 ◽  
Vol 11 (3) ◽  
pp. 389-417 ◽  
Author(s):  
HANS FEHR ◽  
MANUEL KALLWEIT ◽  
FABIAN KINDERMANN
Keyword(s):  
Demographic Transition ◽  
Simulation Analysis ◽  
Pension Reform ◽  
Retirement Age ◽  
Extensive Margin ◽  
Long Run ◽  
Old Age Poverty ◽  
Simulation Results ◽  
One Year ◽  
Model Features

AbstractThe paper analyzes the recent pension reform in Germany which increases the normal retirement age by two years. The applied simulation model features a realistic demographic transition, distinguishes three skill classes with different life expectancies and allows individuals to choose their labor supply at the intensive and the extensive margin.Our simulation results indicate that under the existing pension rules long-run contribution rates and old-age poverty rates will increase considerably. The proposed rise in the normal retirement age will postpone effective retirement by about one year and redistribute towards future cohorts. A stronger delay in effective retirement may be achieved by raising the actuarial adjustment of benefits.

scholarly journals Performance analysis of glazed PVT collectors for multifamily building

2020 ◽  
Vol 172 ◽  
pp. 12003
Author(s):  
Nikola Pokorny ◽  
Tomas Matuska
Keyword(s):  
Mathematical Model ◽  
Performance Analysis ◽  
Potential Application ◽  
Simulation Analysis ◽  
Climatic Conditions ◽  
Building Envelope ◽  
Hot Water ◽  
Photovoltaic Panels ◽  
Domestic Hot Water ◽  
Solar Thermal Collectors

The paper deals with performance analysis of potential application of glazed photovoltaic-thermal collector for domestic hot water preparation for multifamily building in European climatic conditions. Two different solutions are studied, glazed photovoltaic-thermal collectors integrated in the building envelope and glazed photovoltaic-thermal collectors fixed on the roof of the building. Moreover, the paper presents a comparison with conventional side by side installation of solar thermal collectors and photovoltaic panels to show the benefit of photovoltaic-thermal collectors. Simulation analysis has been done in TRNSYS with use of developed and validated mathematical model of glazed photovoltaic-thermal collector.

Micro-Defects Test Simulation Analysis and Experiment Research under Alternating Electromagnetic Excitation

2013 ◽  
Vol 798-799 ◽  
pp. 452-455
Author(s):  
Xia Yu ◽  
Wei Ming Zhang ◽  
Zhong Chao Qiu ◽  
Cheng Feng Chen
Keyword(s):  
Simulation Analysis ◽  
Crack Depth ◽  
Simulation Software ◽  
Good Effect ◽  
Electromagnetic Simulation ◽  
Test Results ◽  
Current Field ◽  
Electromagnetic Excitation ◽  
Simulation Results ◽  
Alternating Magnetic Fields

Alternating current field Measurement is one of the important progresses about electromagnetic nondestructive testing in recent years. Alternating magnetic fields excitation testing model is established by using electromagnetic simulation software ANSOFT, a flat plate crack defects are simulated. By analyzing its principle, crack depth and the width change influence on test results, finally the simulation results are verified by the method of experiment. The experimental results are consistent with the simulation results. The results show that this differential probe has good effect on crack defects test.

scholarly journals Simulation Analysis on Partial Discharge Signals Produced by Multiple Insulation Defects in GIS

2020 ◽  
Vol 165 ◽  
pp. 06040
Author(s):  
Yuxin Yun ◽  
Guangke Xu ◽  
Weiwei Zhang ◽  
Xing Li ◽  
Lingying Chen
Keyword(s):  
Electromagnetic Field ◽  
Simulation Analysis ◽  
Partial Discharge ◽  
Simulation Software ◽  
Impact Response ◽  
Current Signal ◽  
Linear Convolution ◽  
Simulation Results ◽  
Gas Insulated Substation ◽  
Linear Mixtures

In this paper, the simulation analysis on partial discharge (PD) signals produced by multiple insulation defects in gas insulated substation (GIS) has been researched by the simulation software of electromagnetic field (XFDTD). The theoretical analysis and simulation results show that the single partial discharge signal is the linear convolution of the partial discharge current signal and its corresponding impact response in GIS. The mixed partial discharge signals are the linear mixtures of every partial discharge signal.

Effect of Ambient Temperature Zinc Oxide Surge Arrester Condition Monitoring

2014 ◽  
Vol 554 ◽  
pp. 573-577 ◽  
Author(s):  
Zulkurnain Abdul-Maleka ◽  
Amir Hesam Khavari ◽  
Nabipour Afrouzi Hadi ◽  
Saeed Vahabi-Mashak
Keyword(s):  
Experimental Data ◽  
Zinc Oxide ◽  
Surface Temperature ◽  
Ambient Temperature ◽  
Simulation Analysis ◽  
Simulation Software ◽  
Surge Arresters ◽  
Simulation Results ◽  
Comsol Simulation ◽  
The Relationship

Various methods have been developed to monitor surge arrester condition and predict the probable interruption which can be caused by the failure of surge arresters. This paper aims to carry out experimental and simulation work to find the relationship between the aging level, arrester surface temperature and ambient temperature. COMSOL simulation software was used for the modeling of 120kV rated gapless ZnO surge arresters. It is observed from both the simulation analysis and experimental data that the leakage current and temperature increase as a consequence of an increase in the applied voltage across the arrester. The thermal profile of the ZnO surge arrester changes depending on the aging level and the ambient temperature. The surface temperature simulation results compare well with the experimental results, for the case of varying aging levels.

Simulation Analysis of Proportional Valve Controlled Cylinder Hydraulic System Based on AMESim

2013 ◽  
Vol 668 ◽  
pp. 420-425 ◽  
Author(s):  
Ning Xie ◽  
Xi Chen ◽  
Jin Jin Guo
Keyword(s):  
System Performance ◽  
Hydraulic System ◽  
Simulation Analysis ◽  
Dynamic Performance ◽  
Hydraulic Cylinder ◽  
Simulation Software ◽  
Proportional Valve ◽  
Position Accuracy ◽  
Simulation Results ◽  
Amesim Simulation

Focusing on the performance of proportional valve controlled cylinder, by using AMESim simulation software, dynamic performance of the system has been simulated. Starting by the control strategy, using Genetic Algorithm,the PID parameters which can affect the hydraulic cylinder position accuracy will be optimized. The simulation results show that the optimized parameters can improve system performance, and achieved excellent results.

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