scholarly journals ЕНЕРГОСПОЖИВАННЯ НАВЧАЛЬНИХ КОРПУСІВ УНІВЕРСИТЕТУ В УМОВАХ КАРАНТИННИХ ОБМЕЖЕНЬ УКРАЇНИ

2021 ◽  
pp. 9-19
Author(s):  
VALERII DESHKO ◽  
INNA BILOUS ◽  
IRYNA SUKHODUB ◽  
TETYANA BOIKO
Keyword(s):  
Energy Consumption ◽  
Energy Saving ◽  
Integrated Approach ◽  
Climatic Conditions ◽  
Operating Conditions ◽  
Normal Operation ◽  
Software Environment ◽  
Depth Analysis ◽  
Educational Buildings ◽  
Academic Building

Target. To analyze the features of energy consumption of the building of the educational building No. 17 of the National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute" in the conditions of quarantine restrictions in the implementation of energy-saving heating schemes.Methodology. Dynamic energetic modeling of a university academic building created in the DesignBuilder software environment under normal and quarantine modes.Results. Recommendations for the implementation of energy-saving modes of heating the building of the academic building of the university during the period of distance learning when introducing quarantine restrictions in Ukraine.Scientific novelty. An integrated approach has been developed to an in-depth analysis of energy consumption under conditions of partial use of the premises of educational buildings during the quarantine period. It is substantiated that the use of premises with partial operation of the building requires additional unit costs for heating needs.Practical significance. Simulation dynamic modeling of the building's energy consumption for heating for various modes of operation and employment / use of premises of educational buildings during the quarantine period in Ukraine, the results of the study will allow to obtain a set of energy characteristics of the building as a whole and its individual rooms / zones for hourly changes in internal operating conditions and external climatic conditions. The use of the proposed scheme of operation of the heating system of the building of the educational building allows to reduce energy consumption during the heating period by 8,5% compared to energy consumption during normal operation, which is economically feasible in conditions of partial occupancy of the building during quarantine restrictions (during lockdown) and an unpredictable macroeconomic situation on the energy market, causing a trend towards an increase in prices for basic energy resources.

scholarly journals Energy Saving Estimation of Athens Trolleybuses Considering Regenerative Braking and Improved Control Scheme

Resources ◽  
2018 ◽  
Vol 7 (3) ◽  
pp. 43 ◽  
Author(s):  
Nena Apostolidou ◽  
Nick Papanikolaou
Keyword(s):  
Energy Consumption ◽  
Energy Saving ◽  
Control Method ◽  
Direct Torque Control ◽  
Transportation Systems ◽  
Operating Conditions ◽  
Torque Control ◽  
Normal Operation ◽  
Regenerative Braking ◽  
Total Energy Consumption

In this work, the electromechanical system of the 8000-series of Athens trolleybuses, based on data provided by OSY S.A., is analyzed. Those data were used to develop a valid model in order to estimate the total energy consumption of the vehicle under any possible operating conditions. In addition, an effort is made to estimate the energy saving potential if the wasted energy—in the form of heat—during braking or downhill courses is recovered (regenerative braking) and retrofitted during normal operation. This process requires the installation of appropriate electrical apparatus to recover and temporarily store this energy amount. Moreover, due to the fact that the main engine of the system is an asynchronous electric machine, its driving scheme is also of interest. This study assumes the current driving scheme, that is the direct vector control (DVC), and proposes an alternative control method, the direct torque control (DTC). Energy consumption/saving calculations highlight the effectiveness of incorporating regenerative braking infrastructure in trolleybuses transportation systems. Finally, a sustainable hybrid energy storage unit that supports regenerative braking is proposed.

scholarly journals Retrofit Strategies for Energy Efficiency of Historic Urban Fabric in Mediterranean Climate

Atmosphere ◽  
2020 ◽  
Vol 11 (7) ◽  
pp. 742
Author(s):  
Meltem Ulu ◽  
Zeynep Durmuş Arsan
Keyword(s):  
Energy Consumption ◽  
Energy Saving ◽  
Energy Efficient ◽  
Mediterranean Climate ◽  
Residential Buildings ◽  
Integrated Approach ◽  
Design Parameters ◽  
Urban Fabric ◽  
Depth Analysis ◽  
Related Design

Energy-efficient retrofitting of historic housing stock requires methodical approach, in-depth analysis and case-specific regulatory system, yet only limited efforts have been realized. In large scale rehabilitation projects, it is essential to develop a retrofit strategy on how to decide energy-efficient solutions for buildings providing the most energy saving in a short time. This paper presents a pilot study conducted at a neighborhood scale, consisting of 22 pre-, early-republican and contemporary residential buildings in a historic urban fabric in the Mediterranean climate. This study aims to develop an integrated approach to describe case-specific solutions for larger scale historic urban fabric. It covers the building performance simulation (BPS) model and numerical analysis to determine the most related design parameters affecting annual energy consumption. All the case buildings were classified into three main groups to propose appropriate retrofit solutions in different impact categories. Retrofit solutions were gathered into two retrofit packages, Package 1 and 2, and separately, three individual operational solutions were determined, considering a five-levelled assessment criteria of EN 16883:2017 Standard. Energy classes of case buildings were calculated based on National Building Energy Regulations. Changes in building classes were evaluated considering pre- and post-retrofit status of the buildings. For the integrated approach, the most related design parameters on annual energy consumption were specified through Pearson correlation analysis. The approach indicated that three buildings, representing each building group, can initially be retrofitted. For all buildings, while maximum energy saving was provided by Package 2 with 48.57%, minimum energy saving was obtained from Package 1 with 19.8%.

ФОРМУВАННЯ МЕРЕЖІ ЦЕНТРІВ ЕНЕРГОХАБА ЗНАНЬ ДЛЯ ПРОГНОЗУВАННЯ ПРІОРИТЕТНОГО НАПРЯМУ РОЗВИТКУ ПРОГРАМ ЕНЕРГОЕФЕКТИВНОСТІ ТА ЕНЕРГОЗБЕРЕЖЕННЯ В ЗАКЛАДАХ ВИЩОЇ ОСВІТИ

2022 ◽  
pp. 35-44
Author(s):  
Ivan M. Gryshchenko ◽  
Mykhailo O. Verhun ◽  
Andrii S. Prokhorovskyi
Keyword(s):  
Higher Education ◽  
Energy Efficiency ◽  
Energy Consumption ◽  
Energy Saving ◽  
Higher Education Institutions ◽  
Action Plan ◽  
Energy Sources ◽  
Energy Supply System ◽  
Depth Analysis ◽  
The University

This article attempts to verify the relevance of building a network of energy knowledge hub centres to tackle the priority objective in enhancing energy efficiency and energy saving management in higher education institutions. It is emphasized that the issues of careful and wise use of fuels and energy resources challenge more government efforts, active use of advanced projects to manage energy saving and energy efficiency through the integrated use of different energy sources. The study argues that to identify the potential for energy saving, setting regulatory indicators of energy consumption, determining the key energy saving measures and target objects in the public sector where energy saving programs are planned to be implemented, there is a need to conduct energy surveys with further developing of energy passports for buildings. In the frameworks of this study, the following research methods were used: abstract and logical analysis – to interpret the essence of energy saving concepts for universities; systemic approach – to identify the specifics of energy saving projects implementation in universities; in-depth analysis and synthesis – to forecast the university development priority area of the "Energy efficiency and energy saving"; system, structural, comparative and statistical analyses – to assess the energy consumption in universities; economic and statistical methods – to evaluate the level and the dynamics of the energy sources use before and after the implementation of project activities; graph-based and analytical methods – to facilitate visual representation and schematic presentation of forecasts for further development of energy efficiency and energy saving systems. The study offers a mechanism to shape a network of energy knowledge hub centres to forecast a priority development area of energy efficiency and energy saving programs in higher education institutions along with providing an overview on the process of energy saving based on energy knowledge hub centres by carrying out the following tasks: project identification, scanning, energy audit, implementation of an action plan, and monitoring. It has been verified that to enhance the energy supply system in the university buildings, the following objectives should be attained: using the energy knowledge hub to forecast the university energy efficiency and energy saving programme, implementing an automated individual heating station with weather regulation and installing new radiator heaters.

Numerical simulation of ship propulsion transients and full-scale validation

2003 ◽  
Vol 217 (1) ◽  
pp. 41-52 ◽  
Author(s):  
U Campora ◽  
M Figari
Keyword(s):  
Full Scale ◽  
Operating Conditions ◽  
Dynamics Simulation ◽  
Normal Operation ◽  
System Response ◽  
Prime Mover ◽  
Software Environment ◽  
Simulation Code ◽  
Ship Propulsion ◽  
Wide Range

The paper describes a mathematical model for the dynamics simulation of ship propulsion systems. The model, developed in a MATLAB-SIMULINK software environment, is structured in modular form; the various elements of the system are described as individuals blocks (hull, prime mover, gear, waterjet, etc.) and linked together to take their interactions into account. In this way it is possible to characterize the dynamic behaviour of both the single component and the whole propulsion plant. The model may be used to analyse the system response at off-design and transient conditions. In particular, the developed computer simulation code may be considered as a useful tool to facilitate the correct matching of the prime mover (diesel or gas turbine) to the propulsor (waterjet or propeller) in a wide range of operating conditions. The paper shows the application of the methodology to a cruise ferry used to validate the model results through a full-scale test campaign conducted by the authors during normal operation of the ship.

Energy Saving in a Heat Pump Air-Conditioning System Using Liquid Desiccant and Membrane Contactors

2011 ◽  
Author(s):  
Stefano Bergero ◽  
Anna Chiari
Keyword(s):  
Energy Saving ◽  
Heat Pump ◽  
Hybrid System ◽  
Air Conditioning ◽  
Energy Savings ◽  
Climatic Conditions ◽  
Operating Conditions ◽  
Membrane Contactor ◽  
Traditional System ◽  
Vapour Compression

It has been demonstrated in the literature that significant energy savings can be achieved in air-conditioning through the use of so-called hybrid systems, in which a chemical dehumidification system is combined with a vapour-compression heat pump. The advantage of such systems lies in the fact that the heat pump can operate at a higher evaporation temperature than that of a traditional system in which dehumidification is achieved through condensation, thereby achieving higher coefficients of performance. The hybrid system described in the present paper operates as follows: the air supplied to the conditioned ambient is simultaneously cooled and dehumidified in an air-solution membrane contactor. The LiCl solution is cooled by means of a vapour-compression heat pump using the refrigerant KLEA 410A. The solution is regenerated in another membrane contactor by exploiting the exhaust air and the heat rejected by the condenser. A study of the steady-state behaviour of the system in summer climatic conditions was carried out, on varying some significant operating parameters, such as the thermal efficiency of the heat exchangers, the outdoor temperature and the sensible load of the conditioned room. The performances of the hybrid system were compared with those of a traditional direct-expansion air-conditioning plant; the results of the simulations reveal that, in particular operating conditions, energy saving can exceed 50%.

scholarly journals ANALYSIS OF RESULTS OF MEASURES PERFORMED TO INCREASE ENERGY EFFICIENCY IN VASIL KARAGIOZOV HIGH SCHOOL OF YAMBOL, BULGARIA

2018 ◽  
Vol 6 (4) ◽  
pp. 306-310 ◽  
Author(s):  
Ivan Binev
Keyword(s):  
High School ◽  
Energy Efficiency ◽  
Energy Consumption ◽  
Energy Saving ◽  
Energy Use ◽  
Energy Savings ◽  
Climatic Conditions ◽  
Improve Energy Efficiency ◽  
Before And After ◽  
The Impact

The report analyzes the results of the implemented measures to improve energy efficiency in Vasil Karagiozov High school of Yambol, Bulgaria. Energy savings are determined by measuring and/or calculating energy consumption with previously adopted baseline levels, implementing a measure or program to improve energy efficiency by providing normalized corrections corresponding to the impact of specific climatic conditions on energy use. A reference heating energy consumption of 38.62 kWh/m2 was determined after the renovation of the building. Comparing the reference energy costs for heating before and after the implementation of the energy saving measures show a real decrease of the energy consumption for heating by 53.44%. Compared to the reference energy consumption for heating before and after the energy saving measures show an actual reduction of energy consumption for heating by 47.86%.

Energy-Efficient Technologies in the Construction of School in Hot Climates

2014 ◽  
Vol 587-589 ◽  
pp. 287-293 ◽  
Author(s):  
Anastasiia Sergeevna Fidrikova ◽  
Olga Sergeevna Grishina ◽  
Alexey Pavlovich Marichev ◽  
Xeniya Mikhailovna Rakova
Keyword(s):  
Energy Efficiency ◽  
Energy Consumption ◽  
Energy Saving ◽  
Energy Efficient ◽  
Climatic Conditions ◽  
Energy Reduction ◽  
Insulating Materials ◽  
Space Planning ◽  
Class A ◽  
Reduce Energy Consumption

Reduction of the costs in the operation of the building, due to energy-saving technologies, is a priority in the construction today. This article discusses some ways to reduce energy consumption of schools in hot climates such as the installation of solar collectors, using of triple-glazed windows and modern insulating materials. These methods of energy reduction are determined by the selected space-planning solutions, constructive features of the structure, financial possibilities and climatic conditions. Considering these above listed characteristics, the school was designed for the class A of energy efficiency.[1-4]

Transient Energy Models of Housing Facilities Operation

2021 ◽  
Vol 23 ◽  
pp. 539-551
Author(s):  
Valeriі Deshko ◽  
Inna Bilous ◽  
Dmytro Biriukov ◽  
Olena Yatsenko
Keyword(s):  
Energy Consumption ◽  
Heating System ◽  
Operating Conditions ◽  
Energy Resources ◽  
Climate Data ◽  
Software Environment ◽  
Heating Systems ◽  
Energy Models ◽  
Total Energy Balance ◽  
The City

Buildings are the main consumer of energy resources in the total energy balance of the countries in Central and Eastern Europe, the main energy consumption is allocated for heating. Efficient use of energy resources for heating needs to a large extent depends on the efficiency of regulation of heating systems. In the article, dynamic mathematical models of a two-room typical apartment in Ukraine, built in 2016, were developed in Matlab and EnergyPlus software environment. The simulations were carried out using IWEC hourly climate data for the city of Kyiv. The results of simulations of thermal energy consumption in Matlab are characterized by a larger range of fluctuations of the heating system load, which is typical for the real operating conditions of the system with the controller of ON/OFF type. In EnergyPlus it is assumed that the gas boiler operates continuously in the ON mode. In the research, the change of load on the apartment heating system was studied at different numbers and locations of air temperature control sensors installation, according to which the controller of the autonomous gas boiler operates.

scholarly journals Justification of the possibility of constructing passive multi-story residential buildings in the climatic conditions of Central Russia

2021 ◽  
Vol 11 (3) ◽  
pp. 58-78
Author(s):  
Alexander I. Tsyganov ◽  
Keyword(s):  
Carbon Dioxide ◽  
Energy Consumption ◽  
Energy Saving ◽  
Thermal Insulation ◽  
Russian Federation ◽  
Energy Sector ◽  
Climatic Conditions ◽  
Central Russia ◽  
The Russian Federation ◽  
Negative Impacts

Introduction. We won’t be able to solve global ecological problems without solving the energy issue. It is necessary to expand the energy sector and switch to energy saving technologies. Power generation is among sources of negative impacts on the environment and man. The emission of carbon dioxide into the atmosphere, discharge of polluted liquid waste into rivers, creation of huge water reservoirs, warming of water bodies, depletion of fuel resources, deforestation, emission of toxic substances into the atmosphere and water, burial of radioactive waste — this list of negative impacts, produced by the energy sector on the environment, is not exhaustive. At the end of the 20th century, humanity finally rea­lized how serious the problem of carbon dioxide in the atmosphere was. The consolidation of these two issues, namely, environmental protection and conservation of natural resources, tightened the requirements for the construction of buil­dings in terms of thermal insulation, reduction of energy consumption for heating, and introduction of a closed power cycle at production facilities. The article deals with construction of passive multi-storey houses in different climatic conditions of the Russian Federation. The problem of energy saving and thermal insulation of buildings in construction is addressed. The analysis of energy consumption by passive buildings in the climatic conditions of Central Russia is made. Materials and methods. Currently, heating consumption by all types of buildings during the heating season in Russia is analyzed in accordance with Annex G of SNiP 23-02-2003. In addition, a national standard of the Russian Federation was developed, approved and put into effect by Decree of the Federal Agency for Technical Regulation and Metrology No. 1211-st dated October 25, 2013. This standard is amended in relation to ISO 13790:2008. This Russian standard is a regulatory document on annual heat and electricity costs of maintaining the microclimate on heated or cooled premises. Results. The technology has advanced, and now the construction market offers houses with seamless facades and improved sound and heat insulation. These are monolithic frame houses with good thermal insulation, since monolithic concrete is poured directly into the formwork on the construction site, lined with glass wool thermal insulation and clad with facade panels, which reduces heat loss from a building. Conclusions. The analysis of the energy consumption calculation method has proven an efficient tool to determine the heat demand of heating systems. The calculation allows to determine heat losses associated with the transfer of heat through an external envelope and the need for thermal energy. In other words, given that the data for each climatic zone is correct, including selected construction materials, thickness of enclosure structures with account for solar energy, and the proper use of modern intake-exhaust systems, the construction of buildings, featuring higher energy efficiency in the climatic conditions of Central Russia, is possible and absolutely realistic.

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