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Selected paper from 7th International Conference on Renewable Energy Sources (ICoRES 2021)- Energy, Enviroment and Economy in RES

A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "L: Energy Sources".

Deadline for manuscript submissions: closed (31 December 2022) | Viewed by 11668

Special Issue Editors

Department of Mechanical Engineering and Agrophysics, University of Agriculture in Krakow, 33-332 Krakow, Poland
Interests: biomass; torrefaction; pellets; agriculture biowaste
Special Issues, Collections and Topics in MDPI journals
Department of Mechanical Engineering and Agrophysics, University of Agriculture in Krakow, 30-149 Krakow, Poland
Interests: biomass; pellets; agriculture residues; agglomeration; RDF

Special Issue Information

Dear Colleagues,

The 7th edition of the Renewable Energy Sources International Conference (ICORES2021) will be one of the most recognizable scientific meetings connected to RES in Poland. It will be held from 9 to 11 June, 2021.From the very beginning, this conference has been a unique occasion for gathering Polish and international researchers’ perspectives on renewable energy sources and balancing them against governmental policy considerations. Accordingly, the conference has also offered panels to discuss best practices and solutions with local entrepreneurs and federal government bodies. The meeting attracts not only scientists but also industry representatives, as well as local and federal government personnel. We are open to new and fresh ideas concerning renewable energy, which is why so many scientists from Central and Eastern Europe visit Krynica to discuss the “Green Future” of this region.

In 2021, the conference will be organized by the University of Agriculture in Krakow, in cooperation with the AGH University of Science and Technology (Krakow), State Agrarian and Engineering University in Podilya, University of Žilina, International Commission of Agricultural and Biosystems Engineering (CIGR) and Polish Society of Agricultural Engineering.

Dr. Marcin Jewiarz
Prof. Dr. Krzysztof Mudryk
Guest Editors

Manuscript Submission Information

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Keywords

  • Solar energy
  • Geothermal energy
  • Biomass and biomass fuels
  • Combustion, co-combustion, and CHP in RES systems
  • Heat pumps
  • Wind energy
  • Fuel cell
  • Waste and heat
  • Modelling, simulation, and optimization of renewable energy systems
  • Advanced energy storage technologies
  • Politics and economics of renewable energy sources

Related Special Issue

Published Papers (4 papers)

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Research

16 pages, 1964 KiB  
Article
The Circular Economy in the Management of Waste from Leather Processing
Energies 2023, 16(1), 564; https://doi.org/10.3390/en16010564 - 03 Jan 2023
Cited by 6 | Viewed by 2904
Abstract
The tanning industry generates significant amounts of solid waste and post-production wastewater, which should be managed in accordance with the principles of the circular economy. Waste is generated at various technological stages of production. This comprises mainly solid waste and leachate. A comprehensive [...] Read more.
The tanning industry generates significant amounts of solid waste and post-production wastewater, which should be managed in accordance with the principles of the circular economy. Waste is generated at various technological stages of production. This comprises mainly solid waste and leachate. A comprehensive solution to the problem of disposal of this waste is very important from economic and environmental points of view. This work presents research for a technological production line designed for the comprehensive processing of post-production residues. In the present paper, the authors present an analysis related to the possibility of processing leather flesh side (mizdra) as a substrate for methane fermentation. The study showed an increased biogas production from solid waste after enzymatic hydrolysis up to 248 Nm3/Mg. Preliminary research on the system designed for pre-treatment of sewage from the technological line is also presented. The study showed a COD reduction of more than 30%. The possibility of energy management of the solid fraction directly from the processes carried out is demonstrated. Full article
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32 pages, 10569 KiB  
Article
Assessment of Ground Regeneration around Borehole Heat Exchangers between Heating Seasons in Cold Climates: A Case Study in Bialystok (NE, Poland)
Energies 2021, 14(16), 4793; https://doi.org/10.3390/en14164793 - 06 Aug 2021
Cited by 5 | Viewed by 1949
Abstract
Based on the experimental studies, the process of ground regeneration around the borehole loaded with brine-water heat pumps working exclusively for heating purposes in the period of four consecutive heating seasons in a cold climate was presented. The research was conducted in north-eastern [...] Read more.
Based on the experimental studies, the process of ground regeneration around the borehole loaded with brine-water heat pumps working exclusively for heating purposes in the period of four consecutive heating seasons in a cold climate was presented. The research was conducted in north-eastern Poland. The aim of the work is to verify the phenomenon of thermal ground regeneration in the period between heating seasons on the basis of the recorded data and to check whether the ground is able to regenerate itself and at what rate. It was noticed that the ground does not fully regenerate, especially during heating seasons with lower temperatures. In the analyzed period, from 22 September 2016 to 12 October 2020, the ground probably cooled irreversibly by 1.5 °C. In order to illustrate and evaluate the speed of changes in the ground, the one’s profile with an undisturbed temperature field was presented for each month of the year. The presented results can be a very important source of information for the analysis of geothermal conditions occurring in the ground. They can be used to verify mathematical models and conduct long-term simulations that allow us to see the complexity of the processes taking place in the ground. Full article
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15 pages, 5863 KiB  
Article
An Assessment of the Efficiency and Emissions of a Pellet Boiler Combusting Multiple Pellet Types
Energies 2021, 14(15), 4465; https://doi.org/10.3390/en14154465 - 23 Jul 2021
Cited by 21 | Viewed by 4076
Abstract
With sustainable energy being the key to reaching climate neutrality, the utilization of non-wooden biomass is a necessity. This article compares the emissions and efficiency of combusting a number of types of agrobiomass and wood pellets. A comparison was made on a moving [...] Read more.
With sustainable energy being the key to reaching climate neutrality, the utilization of non-wooden biomass is a necessity. This article compares the emissions and efficiency of combusting a number of types of agrobiomass and wood pellets. A comparison was made on a moving grate pellet burner mounted in a boiler, where flue gas had a vertical flow via two pass heat exchangers with turbulization elements. Tests were conducted on wood pellets (ENPlus), miscanthus straw pellets, sunflower husk pellets, and corn stover pellets. During combustion, both wood and miscanthus pellets met the PN-EN 303-5:2012 emission and efficiency requirements. Corn stover pellets met the requirement on the nominal capacity. Sunflower husk pellets are characterized by excessive CO and particulate matter emissions. Sunflower husk pellets were the most problematic fuel from the point of view of the results of this research. During combustion of the miscanthus straw pellets there was a need to decrease the nominal heating capacity due to ash sintering. Full article
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21 pages, 6850 KiB  
Article
Determination of the Selected Wells Operational Power with Borehole Heat Exchangers Operating in Real Conditions, Based on Experimental Tests
Energies 2021, 14(9), 2512; https://doi.org/10.3390/en14092512 - 27 Apr 2021
Cited by 7 | Viewed by 1492
Abstract
On the basis of experimental studies, the operational power of four borehole heat exchangers (BHE) under real conditions was determined. The research was carried out in 2018–2019. The theoretical power of the BHE was verified with its operating power. The amount of thermal [...] Read more.
On the basis of experimental studies, the operational power of four borehole heat exchangers (BHE) under real conditions was determined. The research was carried out in 2018–2019. The theoretical power of the BHE was verified with its operating power. The amount of thermal energy absorbed from the ground by individual BHEs, the operating temperatures obtained at the inlet and outlet of the exchanger, the annual brine flow rate, and the average operating power of the tested wells in two heating seasons were compared and analyzed. Both in 2018 and 2019, none of the examined exchangers achieved an average unit capacity of a well. The aim of the work is to verify the specific ground thermal efficiency indicators adopted for the design of the lower heat source, determined using the computational method and the TRT test with data obtained on the basis of experimental tests. The differences between the results of the tests of the operating parameters of the analyzed BHEs were shown. The data obtained in real conditions is valuable in the research and development of the BHE system. Full article
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