scholarly journals Evaluation of the energy efficiency of an industrial consumer in trigeneration mode

2019 ◽  
Vol 85 ◽  
pp. 01005
Author(s):  
Constantin Ionescu ◽  
Diana Tuţică ◽  
Roxana Pătraşcu ◽  
Cristian Dincă ◽  
Nela Slavu
Keyword(s):  
Energy Efficiency ◽  
Energy Supply ◽  
Multicriteria Analysis ◽  
High Energy ◽  
Management Program ◽  
Hot Water ◽  
Industrial Society ◽  
Technological Solution ◽  
Efficiency Performance ◽  
A Company

The optimization of the energy supply solution of an industrial facility is a main objective of any management program within a company, having as desideratum: quality, safety and flexibility in energy supply. The electricity and heat supply (heat and cold) using a trigeneration plant is a modern technological solution, with high energy efficiency performance and low impact on the environment. Also, this technology is economically efficient, assuring the reduction of the global energy consumption of the industrial society, and implicitly the increasing of the profit. The input data considered in this paper are the values and the characteristics of the demands of the three energy forms belonging to the analysed industrial consumer. The structure of the thermal energy both as heat (technological steam, heating, domestic hot water) and cold (air conditioning) is considered. The consumption of the electricity covers the need of both the technological process and of the buildings (power supply and lighting). In a first stage, the most suitable technological solution for the specific conditions and characteristics of the needs is chosen. The multicriteria analysis of the proposed technological solution is performed during the next stage.

scholarly journals Overall Efficiency of On-Site Production and Storage of Solar Thermal Energy

2021 ◽  
Vol 13 (3) ◽  
pp. 1360
Author(s):  
Teodora M. Șoimoșan ◽  
Ligia M. Moga ◽  
Livia Anastasiu ◽  
Daniela L. Manea ◽  
Aurica Căzilă ◽  
...  
Keyword(s):  
Energy Efficiency ◽  
Thermal Energy ◽  
Urban Areas ◽  
Renewable Energy Sources ◽  
Multicriteria Analysis ◽  
High Energy ◽  
Solar Thermal ◽  
Solar Thermal Energy ◽  
The Impact ◽  
And Storage

Harnessing renewable energy sources (RES) using hybrid systems for buildings is almost a deontological obligation for engineers and researchers in the energy field, and increasing the percentage of renewables within the energy mix represents an important target. In crowded urban areas, on-site energy production and storage from renewables can be a real challenge from a technical point of view. The main objectives of this paper are quantification of the impact of the consumer’s profile on overall energy efficiency for on-site storage and final use of solar thermal energy, as well as developing a multicriteria assessment in order to provide a methodology for selection in prioritizing investments. Buildings with various consumption profiles lead to achieving different values of performance indicators in similar configurations of storage and energy supply. In this regard, an analysis of the consumption profile’s impact on overall energy efficiency, achieved in the case of on-site generation and storage of solar thermal energy, was performed. The obtained results validate the following conclusion: On-site integration of solar systems allowed the consumers to use RES at the desired coverage rates, while restricted by on-site available mounting areas for solar fields and thermal storage, under conditions of high energy efficiencies. In order to segregate the results and support optimal selection, a multicriteria analysis was carried out, having as the main criteria the energy efficiency indicators achieved by hybrid heating systems.

scholarly journals High Energy Efficient Heterogeneous Networks: Cooperative and Cognitive Techniques

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Heng Wang ◽  
Jiamo Jiang ◽  
Jian Li ◽  
Manzoor Ahmed ◽  
Mugen Peng
Keyword(s):  
Energy Efficiency ◽  
Cognitive Radio ◽  
Cooperative Communication ◽  
High Energy ◽  
Performance Comparison ◽  
System Capacity ◽  
Small Cells ◽  
Communication Techniques ◽  
High Spectral Efficiency ◽  
Efficiency Performance

Heterogeneous network (HetNet) is considered as the main and eminent future communication technology, since it achieves high spectral efficiency per unit area and saves energy due to low transmission power. Mass deployment of small cells in cochannel mode increases overall system capacity, but it is also coupled with greater risk of cochannel interference. This paper overviews the interference model based on the Poisson point process (PPP) and analyzes the performance in terms of energy efficiency in multitier HetNet. As the promising solution for improving the performance of HetNet, both the cooperative communication and cognitive radio techniques to mitigate the interference in HetNet are surveyed. As one example of cooperative communication techniques, a hierarchical cooperation scheme on the spectrum allocation is presented and its energy efficiency performance is analyzed and evaluated. Meanwhile, the energy efficiency increases from the cognitive radio technique are demonstrated as well. The energy efficiency performance comparison between the presented cooperative communication and cognitive radio techniques is emphasized, which suggests that the cooperation communication technique is preferred to suppress the interference and increase the energy efficiency in HetNets.

Energy efficiency implementation and Greenhouse gas (GHG) reduction by replacing air conditioners by hot water absorption chiller

2021 ◽  
pp. 104-110
Author(s):  
Md. Reswat Azim ◽  
Nadim Khandaker ◽  
Mohammad Moshiur Rahman
Keyword(s):  
Energy Efficiency ◽  
Natural Gas ◽  
Energy Demand ◽  
Energy Production ◽  
Ghg Emissions ◽  
High Energy ◽  
Hot Water ◽  
Air Cooling ◽  
Air Conditioners ◽  
Ghg Reduction

Climate change impacts are burning issues now-a-days all over the world. GHG emissions are mostly due to fossil fuel burning and inefficient energy use. Energy inefficiencies occurred by use of conventional energy technologies. The textile industries are one of the major manufacturing sectors in Bangladesh and energy consumption is quite high for energy production in this sector. Due to high energy demand, most of the textile industries use non-renewable energy source like natural gas, diesel and furnace oil for energy production. This high energy demand increases high consumption of fossil fuels & accelerating emission of GHGs. So, for future sustainability, energy efficiency is must to reduce GHGs and lowering the quantity of natural gas use for energy production. Moreover, purchased electricity consumption from national grid is also increasing every year. This report shows energy efficiency incorporation by using low energy consuming technologies for HVAC systems where co-generation is used i.e. using generator exhausts or hot cooling water (as a source of heat) for making cool water and use it for air cooling which will reduce dependency on air conditioners enhancing GHGs emission reduction. This will reduce the quantity of high Global warming potential refrigerants (R-22, R-134a and R407c) used in air conditioners. No extra heat source will be required in my process design & reuse the hot water as heat source for air cooling cycle. Financial feasibility also has done which will ensure economic profitability in parallel to Energy savings & GHG reduction. This study reveals that it is possible to reduce natural gas & refrigerant’s consumption which is responsible for GHG emissions.

scholarly journals Automatic testing system to evaluate the energy efficiency of electric storage water heaters

2018 ◽  
Vol 51 (7-8) ◽  
pp. 223-234 ◽  
Author(s):  
Jianfeng Yu ◽  
Jian Fu ◽  
Feng Guo ◽  
Yaocong Xie
Keyword(s):  
Energy Efficiency ◽  
Hot Water ◽  
Automatic Testing ◽  
Sensor Data ◽  
Water Withdrawal ◽  
Testing System ◽  
Water Heaters ◽  
Logical Control ◽  
Efficiency Performance ◽  
Automatic Testing System

Background: The energy efficiency of electric storage water heaters is a concern for enterprises and customers because it is beneficial for energy saving. To decrease the workload of testing personnel and improve the testing efficiency, an automatic testing system for evaluating the energy efficiency performance of electric storage water heaters has been designed. Methods: The complete testing system includes a water supply subsystem, hot water outlet subsystem, hardware subsystem, and software subsystem. An application program was developed using Visual Basic to acquire the sensor data and transmit it in real time to a database server. The energy efficiency evaluating process was controlled by the application software,by combining the data acquisition technology, communication technology, and program logical control technology. Results: The designed system can run automatically and achieve reliable tests, two important parameters including the standing loss per 24 h and the hot water withdrawal rate were obtained. Conclusion: This system can be applied to evaluate the energy efficiency grades of electric storage water heaters.

Theory and practice of implementation of high energy efficient technologies in construction based on Thermaron heat generators

2020 ◽  
Author(s):  
Valeriy Kazeykin ◽  
Vladimir Tolstolugov
Keyword(s):  
Energy Efficiency ◽  
Energy Efficient ◽  
High Efficiency ◽  
Electric Energy ◽  
High Energy ◽  
Commercial Real Estate ◽  
Theory And Practice ◽  
Hot Water ◽  
Efficient Technology ◽  
Energy Efficient Technology

The monograph summarizes the legislative and regulatory framework, as well as shows the theory and practice of energy saving and energy efficiency development in Russia and in the world with the actualization of the use of a breakthrough domestic high-energy-efficient technology based on molecular heat generators Termaron. These devices use the principles of hydrolysis, cavitation, magnetism, resonance and synergy of these processes. The results of research conducted with the participation of specialists from Dubna state University, as well as the practice of using the Termaron ATP, showed that its operation provides a high efficiency in the use of electric energy, equal to 0.98, and the coefficient of conversion of electric energy to heat is from 2.3 to 4.6 (on average, 3.45). At the same time, the cost of heat energy and hot water supply is two to three times lower compared to traditional types of heat generating devices. It is intended for representatives of government authorities, University teachers, scientific and practical specialists in the field of design, construction and operation of energy-efficient residential and commercial real estate, state and municipal employees, managers and employees of development companies, students, masters, postgraduates and other specialists interested in improving their competencies in the field of energy efficiency based on domestic innovative breakthrough technologies in Russia and abroad.

Autonomous energy supply based on the wind-energy complex and hydrogen energy storage

2019 ◽  
pp. 12-26
Author(s):  
S. I. Nefedkin ◽  
A. O. Barsukov ◽  
M. I. Mozgova ◽  
M. S. Shichkov ◽  
M. A. Klimova
Keyword(s):  
Wind Speed ◽  
Wind Energy ◽  
Power Supply ◽  
Energy Supply ◽  
Heat Supply ◽  
Hot Water ◽  
Successful Implementation ◽  
High Wind ◽  
Wind Generators ◽  
Weak Wind

The paper proposes an alternative scheme of guaranteed electricity and heat supply of an energy-insulated facility with a high potential of wind energy without the use of imported or local fuel. The scheme represents a wind power complex containing the park of wind generators located at the points with high wind potential. The wind generators provide guaranteed power supply even in periods of weak wind. For heat supply of the consumer, all surplus of the electric power goes on thermoelectric heating of water in tanks of accumulators, and also on receiving hydrogen by a method of electrolysis of water. The current heat supply is carried out with the use of hot water storage tanks, and the heat supply during the heat shortage is carried out by burning the stored hydrogen in condensing hydrogen boilers. We have developed the algorithm of calculation and the program "Wind in energy" which allows calculating annual balance of energy and picking up necessary quantity of the equipment for implementation of the scheme proceeding from the annual schedule of thermal and electric loading, and also potential of wind energy in the chosen region. The calculation-substantiation of the scheme proposed in relation to the real energy-insulated object Ust-Kamchatsk (Kamchatka) is carried out. The equipment for the implementation of an alternative energy supply scheme without the use of imported fuel is selected and compared with the traditional energy supply scheme based on a diesel power plant and a boiler house operating on imported fuel. With the introduction of an alternative power supply scheme, the equipment of the traditional scheme that has exhausted its resource can be used for backup power supply. Using climate databases, a number of energy-insulated facilities in the North and East of Russia with high wind energy potential are considered and the conditions for the successful implementation of the energy supply scheme are analyzed. This requires not only a high average annual wind speed, but also a minimum number of days of weak wind. In addition, it is necessary that the profile of the wind speed distribution in the annual section coincides with the profile of the heat load consumption.

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