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Archives of Thermodynamics

Archives of Thermodynamics

Opis

The aim of the quarterly journal Archives of Thermodynamics is to disseminate knowledge between scientists and engineers worldwide and to provide a forum for original research conducted in the field of thermodynamics, heat transfer, fluid flow, combustion and energy conversion in various aspects of thermal sciences, mechanical and power engineering. Besides original research papers, review articles are also welcome.

The journal scope of interest encompasses in particular, but is not limited to:

  • Classical and extended non-equilibrium thermodynamics,
  • Thermodynamic analysis including exergy,
  • Thermodynamics of heating and cooling,
  • Thermodynamics of nuclear power generation,
  • Thermodynamics in defense engineering,
  • Advances in thermodynamics,
  • Experimental, theoretical and numerical heat transfer,
  • Heat and momentum transfer in multiphase flows and nanofluids,
  • Renewable energy sources including solar energy,
  • Hydrogen Energy,
  • Thermal Energy Conversion,
  • Energy Transition,
  • Advanced Energy Carriers,
  • Energy storage and efficiency,
  • Energy in buildings,
  • Secondary fuels and fuel conversion,
  • Combustion and emissions,
  • Thermal incineration of wastes and waste heat recovery,
  • Thermal and energy system analysis,
  • Combined and integrated energy systems,
  • Distributed energy generation,
  • Turbomachinery.


Appears since 1980, four issues per year.

Publication funding of this journal is provided by resources of the Polish Academy of Sciences and The Szewalski Institute of the Fluid-Flow Machinery of the Polish Academy of Sciences.

Scoring assigned by the Polish Ministry of Science and Higher Education: 140 points

IMPACT FACTOR 2022: 0.9

CiteScore metrics from Scopus, CiteScore 2022: 1.5

SCImago Journal Rank (SJR) 2022: 0.258

Source Normalized Impact per Paper (SNIP) 2022: 0.512

H-index: 17

Overall Rank/Ranking: 17629



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ISSN
ISSN 1231-0956, eISSN 2083-6023
Wydawcy
The Committee of Thermodynamics and Combustion of the Polish Academy of Sciences and The Institute of Fluid-Flow Machinery Polish Academy of Sciences
International Advisory Board

J. Bataille, Ecole Central de Lyon, Ecully, France

A. Bejan, Duke University, Durham, USA

W. Blasiak, Royal Institute of Technology, Stockholm, Sweden

G. P. Celata, ENEA, Rome, Italy

L.M. Cheng, Zhejiang University, Hangzhou, China

M. Colaco, Federal University of Rio de Janeiro, Brazil

J. M. Delhaye, CEA, Grenoble, France

M. Giot, Université Catholique de Louvain, Belgium

K. Hooman, University of Queensland, Australia

D. Jackson, University of Manchester, UK

D.F. Li, Kunming University of Science and Technology, Kunming, China

K. Kuwagi, Okayama University of Science, Japan

J. P. Meyer, University of Pretoria, South Africa

S. Michaelides, Texas Christian University, Fort Worth Texas, USA

M. Moran, Ohio State University, Columbus, USA

W. Muschik, Technische Universität Berlin, Germany

I. Müller, Technische Universität Berlin, Germany

H. Nakayama, Japanese Atomic Energy Agency, Japan

S. Nizetic, University of Split, Croatia

H. Orlande, Federal University of Rio de Janeiro, Brazil

M. Podowski, Rensselaer Polytechnic Institute, Troy, USA

A. Rusanov, Institute for Mechanical Engineering Problems NAS, Kharkiv, Ukraine

M. R. von Spakovsky, Virginia Polytechnic Institute and State University, Blacksburg, USA

A. Vallati, Sapienza University of Rome, Italy

H.R. Yang, Tsinghua University, Beijing, China



Supervisory Editors

• T. Bohdal, Koszalin University of Technology, Poland

• M. Lackowski, Institute of Fluid Flow Machinery, Gdańsk, Poland

Honorary Editor

• J. Mikielewicz, Institute of Fluid Flow Machinery, Gdańsk, Poland

Editor-in-Chief

• P. Ocłoń, Cracow University of Technology, Cracow, Poland

Section Editors

• P. Lampart, Institute of Fluid Flow Machinery, Gdańsk, Poland

• S. Polesek-Karczewska, Institute of Fluid Flow Machinery, Gdańsk, Poland

• I. Szczygieł, Silesian University of Technology, Gliwice, Poland

• A. Szlęk, Silesian University of Technology, Gliwice, Poland

Technical Editors

• J. Frączak, Institute of Fluid Flow Machinery, Gdańsk, Poland

• S. Łopata, Institute of Fluid Flow Machinery, Gdańsk, Poland

Members of Programme Committee

• P. Furmański, Warsaw Univ. Tech., Poland

• J. Badur, Inst. Fluid Flow Mach., Gdańsk, Poland

• T. Chmielniak, Silesian Univ. Tech., Gliwice, Poland

• S. Pietrowicz, Wrocław Univ. Sci. Tech., Poland

• R. Kobyłecki, Częstochowa Univ. Tech., Poland

• J. Wajs, Gdańsk Univ. Tech., Poland

• D. Kardaś: Inst. Fluid Flow Mach., Gdańsk, Poland

Wydawnictwo IMP

The Szewalski Institute of Fluid Flow Machinery PAS

Fiszera 14, 80-952 Gdańsk, Poland

telephone: +48 58 5225 141, fax: +48 58 3416 144

e-mail: jfrk@imp.gda.pl; redakcja@imp.gda.pl

http://www.imp.gda.pl/archives-of-thermodynamics/

https://www.journals.pan.pl/ather

 

 

For articles published in Archives of Thermodynamics, the authors transfer copyright to publisher.

The Archives of Thermodynamics is published in formula: Open Access Gratis.
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Zawartość

Archives of Thermodynamics | 2022 | vol. 43 | No 1

1 Location-optimized aerodynamic rotor design studies and development of small wind turbines
Daniel Lehser-Pfeffermann , Alexander Hamman , Frank Ulrich Rückert
Archives of Thermodynamics | 2022 | vol. 43 | No 1 | 3-19 | DOI: 10.24425/ather.2022.140922
Słowa kluczowe: small wind turbine Fluid energy machines Vertical axis wind turbine Additive manufacturing (AM) Fibre-reinforced composites Computational Fluid Dynamics Large Eddy Simulation Turbulence simulation
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Abstrakt

Local wind conditions can vary strongly depending on the landmark and vegetation, as well as on the skyline of the buildings in an urban surrounding. Weather, season and time of day influence the yield of electric power. In order to promote the use of small wind turbines as an alternative to photovoltaic power generation, design optimization for locationoptimized small wind turbines was carried out. In this work, we want to concentrate on vertical axis wind turbines. Experimental studies, as well as numerical simulations, have been conducted. On the one hand, bionically optimized core structures will be integrated and implemented in the hybrid material of the turbine blades. Several optimization attempts have been examined for single blades. Detailed simulative investigations with large eddy simulations improve the aerodynamic behaviour of the new rotor design. Finally, based on the results of the studies and investigations, a new rotor will be manufactured and tested experimentally in the wind tunnel. A comparison with the reference system from the first part of the paper shows the improvements and effectiveness of the measures and processes investigated.
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Bibliografia

[1] Lehser-Pfeffermann D., Häfele T., Rückert F., Griebsch J., Müller T., Joos F.: Location-optimized aerodynamic design of small wind turbines and lightweight implementation using additive hybrid material. Mech. Mech. Eng. 22(2018), 2437–445.
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[7] Lehser-Pfeffermann D., Theis D., Hamman A., Rückert F.: Investigation and evaluation of aerodynamic efficiency improvement measures for vertical axis small wind turbines. In: Proc. 6th Int. Conf. on Renewable and Non-Renewable Energy, Miami, May 20–21, 2019.
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Autorzy i Afiliacje

Daniel Lehser-Pfeffermann
1
Alexander Hamman
1
Frank Ulrich Rückert
1
  1. University of Applied Sciences Saarbrücken (htw saar), Faculty of Economic Sciences, Campus Rotenbühl, Waldhausweg 14, 66123 Saarbrücken, Germany
2 Implementation of turbulence damping in the OpenFOAM multiphase flow solver interFoam
Jiri Polansky , Sonja Schmelter
Archives of Thermodynamics | 2022 | vol. 43 | No 1 | 21-43 | DOI: 10.24425/ather.2022.140923
Słowa kluczowe: Multiphase flow Stratified flow Turbulence damping Computational fluid dynamics OpenFOAM Reynolds-averaged Navier–Stokes Detached eddy simulation Delayed detached eddy simulation
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Abstrakt

In the presented work Egorov’s approach (adding a source term to the ω-equation in the k-! model, which mimics the damping of turbulence close to a solid wall) was implemented in on the subclass of shear stress transport models. Hence, turbulence damping is available for all shear stress transport type models, including hybrid models that are based on the ω-equation. It is shown that turbulence damping improves the prediction of the axial velocity profile not only for Reynolds-averaged Navier–Stokes simulation but also for detached eddy simulation and delayed detached eddy simulation models. Furthermore, it leads to a more realistic estimation of the pressure drop and, hence, to a more correct prediction of the liquid level. In this paper, simulation results for four different turbulence models are presented and validated by comparison with experimental data. Furthermore, the influence of the magnitude of the damping factor on the pressure drop in the channel is investigated for a variety of different gas-to-liquid flow rate ratios. These investigations show that higher gas-to-liquid flow rate ratios require higher damping factors to correctly predict the pressure drop. In the end, advice is formulated on how an appropriate damping factor can be determined for a specific test case.
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Bibliografia

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Autorzy i Afiliacje

Jiri Polansky
1
Sonja Schmelter
2
  1. Czech Technical University in Prague, Jugoslávských partyzánu 1580/3, 160 00 Prague 6 – Dejvice, Czech Republic
  2. Physikalisch-Technische Bundesanstalt (PTB), Abbestraße 2-12, D-10587 Berlin-Charlottenburg, Germany
3 Development of last stage blade of 13K215 turbine intermediate pressure module
Radoslaw Bondyra , Jan Przytulski , Krzysztof Dominiczak
Archives of Thermodynamics | 2022 | vol. 43 | No 1 | 45-62 | DOI: 10.24425/ather.2022.140924
Słowa kluczowe: Efficiency Strength calculation Steam turbine Last stage blade Fluid flow calculation
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Abstrakt

Paper is considering the purpose and the process of development of last stage blade for intermediate pressure module of 13K215 steam turbine. In the last 20–30 years most of the steam turbine manufacturers were focused on improving such a turbine mainly by upgrading low pressure module. In a result of such a modernization technology were changed from impulse to reaction. The best results of upgrading were given by developing low pressure last stage blade. With some uncertainty and based on state of art knowledge, it can be stand that improving of this part of steam turbine is close to the end. These above indicators show an element on which future research should be focused on – in the next step it should be intermediate pressure module. In the primary design the height of intermediate pressure last stage blade was 500 mm but because of change of technology this value was decreased to 400 mm. When to focus on reaction technology, the height of the last stage blade is related to output power and efficiency. Considered here is the checking the possibility of implementing blades, in a reaction technology, higher than 400 mm and potentially highest. Article shows a whole chosen methodology of topic described above. It leads through the reasons of research, limitations of 13K215 steam turbine, creation of three-dimensional models, fluid flow calculations, mechanical integrity calculations and proposed solutions of design.
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Bibliografia

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Autorzy i Afiliacje

Radoslaw Bondyra
1
Jan Przytulski
1
Krzysztof Dominiczak
2
  1. GE Power Ltd, Stoczniowa 2, 82-300 Elblag, Poland
  2. Institute of Fluid Flow Machinery Polish Academy of Sciences, Fiszera 14, 80-231 Gdansk, Poland
4 Application of innovative solutions to improve the efficiency of the LPC flow part of the 220 MW NPP steam turbine
Andrii Rusanov , Viktor Subotin , Viktor Shvetsov , Roman Rusanov , Serhii Palkov , Ihor Palkov , Marina Chugay
Archives of Thermodynamics | 2022 | vol. 43 | No 1 | 63-87 | DOI: 10.24425/ather.2022.140925
Słowa kluczowe: Steam turbine Low-pressure cylinder Flow part Meridional contours Spatial flow Computational investigations
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Abstrakt

The results of the gas-dynamic calculation of the low-pressure cylinder flow part of the K-220-44 type steam turbine intended for operation at nuclear power plants are presented. The ways of the flow part improvement were determined. Some of those ways include the use of innovative approaches that were not previously used in steam turbines. The design of the new flow part was carried out on the basis of a comprehensive methodology implemented in the IPMFlow software package. The methodology includes gas-dynamic calculations of various levels of complexity, as well as methods for analytical construction of the spatial shape of the blade tracts based on a limited number of parameterized values. The real thermodynamic properties of water and steam were taken into account in 3D calculations of turbulent flows. At the final step, end-to-end 3D calculations of the lowpressure cylinder that consists of 5 stages were performed. The technology of parallel computing was applied in those calculations. It is shown that due to the application of innovative solutions, a significant increase in efficiency can be achieved in the developed low-pressure cylinder.
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Autorzy i Afiliacje

Andrii Rusanov
1
Viktor Subotin
2
Viktor Shvetsov
2
Roman Rusanov
1
Serhii Palkov
1 2
Ihor Palkov
1 2
Marina Chugay
1
  1. The A.N. Podgorny Institute for Mechanical Engineering Problems, National Academy of Sciences of Ukraine, Pozharsky 2/10, 61046 Kharkiv, Ukraine
  2. JSC “Ukrainian Energy Machines” Moskovsky 199, 61037 Kharkiv, Ukraine
5 Neural network approach to compressor modelling with surge margin consideration
Sergiusz Michał Loryś , Marek Orkisz
Archives of Thermodynamics | 2022 | vol. 43 | No 1 | 89-108 | DOI: 10.24425/ather.2022.140926
Słowa kluczowe: Modelling Compressor map Neural-network
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Abstrakt

Artificial neural networks are gaining popularity thank to their fast and accurate response paired with low computing power requirements. They have been proven as a method for compressor performance prediction with satisfactory results. In this paper a new approach of artificial neural networks modelling is evaluated. The auxiliary parameter of ‘relative stability margin Z’ was introduced and used in learning process. This approach connects two methods of compressor modelling such as neuralnetworks and auxiliary parameter utilization. Two models were created, one with utilization of the ‘relative stability margin Z’ as a direct indication of surge margin of any estimated condition, and other with standard compressor parameters. The results were compared by determination of fitting, interpolation and extrapolation capabilities of both approaches. The artificial neural networks used during the process was a two-layer feed-forward neural-network with Levenberg–Marquardt algorithm with Bayesian regularization. The experimental data was interpolated to increase the amount of learning data for the neural network. With the two models created, capabilities of this relatively simple type of neural-network to approximate compressor map was also assessed.
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Bibliografia

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Autorzy i Afiliacje

Sergiusz Michał Loryś
1
Marek Orkisz
2
  1. Hamilton Sundstrand Poland / Pratt & Whitney AeroPower Rzeszów, Hetmanska 120, 35-078 Rzeszów, Poland
  2. Rzeszow University of Technology, Department of Aerospace Engineering, Powstanców Warszawy 8, 35-959 Rzeszów, Poland
6 Design and development of smokeless stove for a sustainable growth
Ramesh Chandra Nayak , Manmatha K. Roul , Prateek Debadarsi Roul
Archives of Thermodynamics | 2022 | vol. 43 | No 1 | 109-125 | DOI: 10.24425/ather.2022.140927
Słowa kluczowe: combustion efficiency calorific value air pollution stove fuel superheater
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Abstrakt

Air pollution has a serious impact on the health of human beings and is a major cause of death worldwide every year. Out of the many sources of air pollution, the smoke generated from household combustion devices is very dangerous due to the incomplete combustion of fuel. Women from rural areas suffer a lot due to this harmful smoke. Diseases like cancer, throat, and lung infection occur in adults and children due to inhalation of this smoke. The traditional chulha used by rural women is operated by using cow dung, straw, and wood, and the air is blown manually by using small metallic pipes. This paper presents the design and development of an innovative stove to maximize flame temperature and minimize air pollution to overcome the health-related issues of rural women. A smokeless stove is presented, in which wood, straw, and cow dung are taken as primary fuel, and superheated steam as a secondary oxidizer for its operation. In this stove, a forced draft is created by the provision of a small fan, which is operated by solar power thus eliminating the need of creating a forced draft manually by the cook which makes this innovative stove superior to the traditional chulha. Owing to the provision of superheated steam, the flame temperature as well as the burning efficiency increases. The cooking time is reduced due to higher flame temperature as compared to the liquefied petroleum gas stove. The main objective of this work is to minimize air pollution and provide a smoke-free environment to the people using such devices as this innovative stove offers complete combustion of fuel. The flame temperature of the designed stove ranges from 595˚C to 700˚C and its thermal efficiency is 10–17% higher than that of the traditional chulha. The design of this stove is unique, and its maintenance cost is also much less.
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Bibliografia

[1] James B.S., Shetty R.S., Kamath A., Shetty A.: Household cooking fuel use and its health effects among rural women in southern India — A cross-sectional study. PLoS ONE 15(2020), 4, e0231757.
[2] Balakrishnan K.: Examining health effects of air pollution in India. ICMR Cent. Adv. Res. Environ. Health, New Delhi 2013.
[3] Onah I., Ayuba H.K., Idris N.M.: Estimation of fuelwood-induced carbon emission from the use of improved cook stoves by selected households in Kwara State, Nigeria. Clim. Change 160 (2020), 3, 463–477.
[4] Obi O.F., Ezema J.C., Okonkwo W.I.: Energy performance of biomass cookstoves using fuel briquettes. Biofuels 11 (2020), 4, 467–478.
[5] Woldesemayate A.T., Atnaw S.M.: A review on design and performance of improved biomass cooks stoves. L. N. Inst. Comp. Sci. Soc.-Inf. Telecomm. Eng. LNICST 308(2020), 557–565.
[6] Flores W.C., Bustamante B., Pino H.N., Al-Sumaiti A., Rivera S.: A national strategy proposal for improved cooking stove adoption in Honduras: Energy consumption and cost-benefit analysis. Energies 13(2020), 4, en13040921.
[7] Mekonnen B.Y., Hassen A.A.: Design, construction and testing of hybrid solarbiomass cook stove. L. N. Inst. Comp. Sci. Soc.-Inf. Telecomm. Eng. LNICST 274 (2019), 225–238.
[8] Jain T., Sheth P.N.: Design of energy utilization test for a biomass cook stove. Formulation of an optimum air flow recipe. Energy 166(2019), 1097–1105.
[9] Manyuchi M.M., Mbohwa C., Muzenda E., Mpeta, M.: Adoption of eco cook stoves as a way of improving energy efficiency. In: Proc. Int. Conf. on Industrial Engineering and Operations Management, Pilsen, July 23–26, 2019, 35–39.
[10] Prasannakumaran K.M., Karthikeyan M., Sanjay Kumar C., Premkumar, D., Kirubakaran V.: Integration of cooking trays for waste heat recovery in the energy efficient wood stove. Indian J. Environ. Prot. 39(2019), 1, 69–73.
[11] Emetere M.E., Okonkwo O.D., Jack-Quincy S.: Investigating heat sink properties for an efficient construction of energy generating cook stove for rural settler. Int. J. Manuf. Mater. Mech. Eng. 8(2018), 3, 12–22.
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[13] Roul M.K., Nayak, R.C.: Experimental investigation of natural convection heat transfer through heated vertical tubes. Int. J. Eng Res Appl. 2(2012), 6, 1088–1096.
[14] Nayak R.C., Roul M.K., Sarangi S.K.: Experimental investigation of natural convection heat transfer in heated vertical tubes with discrete rings. Exp. Tech. 41(2017), 585–603.
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[17] Sahoo L.K., Roul, M.K., Swain R.K.: CFD analysis of steady laminar natural convection heat transfer from a pin finned isothermal vertical plate. Heat Transf. – Asian Res. 46(2017), 840–862.
[18] Sahoo L.K., Roul M.K., Swain R.K.: Natural convection heat transfer augmentation factor with square conductive pin fin arrays. J. Appl. Mech. Tech. Phys. 58(2017), 1115–1122.
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[20] Baqir M., Bharti S.K., Kothari R., Singh, R.P.: Assessment of an energyefficient metal stove for solid biomass fuel and evaluation of its performance. Int. J. Environ. Sci. Technol. 16(2019), 11, 6773–6784.
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Autorzy i Afiliacje

Ramesh Chandra Nayak
1
Manmatha K. Roul
2
Prateek Debadarsi Roul
3
  1. Synergy Institute of Technology, Bhubaneswar – 752101, Odisha, India
  2. GITA Autonomous College, Bhubaneswar – 752054, Odisha, India
  3. Odisha University of Technology and Research, Bhubaneswar – 751003, Odisha, India
7 Calculation of the heat power of a tube heat exchanger
Kazimierz Rup
Archives of Thermodynamics | 2022 | vol. 43 | No 1 | 127-140 | DOI: 10.24425/ather.2022.140928
Słowa kluczowe: Heat power Tube-in-tube exchanger Analytical solutions Numerical calculations
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Abstrakt

In this paper, the logarithmic mean temperature difference method is used to determine the heat power of a tube-in-tube exchanger. Analytical solutions of the heat balance equations for the exchanger are presented. The considerations are illustrated by an example solution of the problem. In particular, the heat power of the tube-in-tube heat exchanger is determined taking into account the variants of work in the co-current and counter-current mode. Apart from the analytical solutions, appropriate numerical calculations in Matlab environment have been carried out.
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Bibliografia

[1] Andrzejczyk R., Muszynski T.: Thermal and economic investigation of straight and U-bend double tube heat exchanger with coiled wire turbulator. Arch. Thermodyn. 40(2019), 2, 17–33.
[2] Bury T., Składzien J., Widziewicz K.: Experimental and numerical analyses of finned cross flow heat exchangers efficiency under non-uniform gas inlet flow conditions. Arch. Thermodyn. 31(2010), 4, 133–144.
[3] Hobler T.: Heat Transfer and Exchangers. Warszawa 1971 (in Polish).
[4] Kuppan T.: Heat Exchanger Design Handbook (2nd Edn.). CRC Press Taylor & Francis Group, Boca Raton 2013.
[5] Nitsche M., Gbadamosi R.O.: Heat Exchanger Design Guide. Elsevier, New York 2016.
[6] Pakowski Z., Adamski R.: Fundamentals of MATLAB in Process Engineering. Lodz Univ. Technol. Press, Łódz 2014 (in Polish).
[7] Roetzel W., Luo X.: Thermal analysis of heat exchanger networks. Arch. Thermodyn. 26(2005), 1, 5–16.
[8] Shah R.K., Sekulic D.P.: Fundamentals of Heat Exchanger Ddesign. Wiley, Hoboken 2003.
[9] Smith E.M.: Thermal Design of Heat Exchangers. A Numerical Approach: Direct- Sizing and Step-Wise Rating. Wiley, Chichester 1997.
[10] Taler D.: Numerical Modeling and Experimental Testing of Heat Exchangers. Springer, Berlin 2018.
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Autorzy i Afiliacje

Kazimierz Rup
1
  1. Cracow University of Technology, al. Jana Pawła II 37, Cracow, Poland
8 Cooling water flow influence on power plant unit performance for various condenser configurations setup
Ewa Dobkiewicz-Wieczorek
Archives of Thermodynamics | 2022 | vol. 43 | No 1 | 141-167 | DOI: 10.24425/ather.2022.140929
Słowa kluczowe: Cooling water Power plant efficiency Cooling water flow control CHP plant efficiency
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Abstrakt

This paper presents the influence of cooling water regulation on power plant net efficiency. It was examined whether, for the non-nominal low-pressure turbine load, it is justified to reduce the cooling water pump load, and how it would affect the unit net efficiency. Calculations for two types of power units were carried out: with condensing and extractioncondensing turbine. The tested condensing power plant consists of three surface condensers. The calculation included four condensers’ connections set up on the cooling water side to check how the cooling water system pressure drop affects the net unit performance. The result has confirmed that implementing serial connection decreases net efficiency when cooling water flow regulation is used, but the mixed connection should be applied when pump load is not controlled. It was proved that the cooling water flow control gives a profit for both units. Net efficiency for combined heat and power plant can be improved by 0.1–0.5 pp, the gain is remarkable below 60% of the low-pressure turbine part load. Flow control implementation in the unit with condensing turbine water control gives a similar profit just below 80% of the turbine load. Next, an influence of the additional limitations of a cooling water system (minimal total pump head, cooling tower) affecting the feasibility of implementing the water control has been considered. Applying a multi-cell forced draft cooling tower does not have a significant impact on results, but when a natural draft cooling tower is used, the flow control range is strongly reduced.
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Bibliografia

[1] Chmielniak T., Łukowicz H.: Modeling and optimization of coal power units with CO2 capture. WPS, Gliwice 2015 (in Polish).
[2] Chmielniak T., Łukowicz H.: Condensing power plant cycle assessing possibilities of improving its e?ciency. Arch. Thermodyn. 31(2010), 3, 105–113.
[3] Grzesiczek E., Mendecki J., Komarnicki Z.: Optimization of cooling water flow in 225 MW turbine condenser. Energetyka (2007), 8, 574–575.
[4] Rusak J.: Reduction of auxiliary energy consumption in TAURON Wytwarzanie S.A. on the example of cooling water systems modernization. Energetyka (2013), 1, 43–47.
[5] Laskowski R.: Wybrane zagadnienia modelowania i optymalizacji skraplaczy energetycznych i wymienników regeneracyjnych. Warszawa: Oficyna Wydawnicza Politechniki Warszawskiej, 2018.
[6] Laskowski R., Smyk A., Rusowicz A., Grzebielec A.: Optimization of the cooling water mass flow rate under variable load of a power unit. Appl. Therm. Eng. 191(2021), 116874.
[7] Gardzilewicz A., Błaszczyk A., Głuch J.: Operating and economic conditions of cooling water control for marine steam turbine condensers. Pol. Marit. Res. 18(2011), 3(70), 48–54.
[8] Harish R., Subhramanyan E.E., Madhavan R., Vidyanand S.: Theoretical model for evaluation of variable frequency drive for cooling water pumps in sea water based once through condenser cooling water systems. Appl. Therm. Eng. 30(2010), 2051–2057.
[9] Xia L., Liu D., Zhou L., Wang P., Chen Y.: Optimization of a seawater oncethrough cooling system with variable speed pumps in fossil fuel power plants. Int. J. Therm. Sci., 91(2015), 105–112.
[10] Dobkiewicz-Wieczorek E.: Cooling water mass flow optimization for low load of condensing turbine including CHP turbine. Rynek Energii (2020), 6, 15–20.
[11] Dobkiewicz-Wieczorek E.: Influence of surface condensers connection configuration on power plant unit performance. Arch. Thermodyn. 41(2020), 4, 115–145.
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[13] Dobkiewicz-Wieczorek E.: Method for calculating the exhaust steam pressure of a condensing turbine. Energetyka (2019), 11, 725–730.
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Autorzy i Afiliacje

Ewa Dobkiewicz-Wieczorek
1
  1. Silesian University of Technology Department of Power Engineering and Turbomachinery, Konarskiego 18, 44-100, Gliwice, Poland
9 Combustion of wood pellets in a low-power multi-fuel automatically stoked heating boiler
Wiesław Zima , Grzegorz Ojczyk
Archives of Thermodynamics | 2022 | vol. 43 | No 1 | 169-184 | DOI: 10.24425/ather.2022.140930
Słowa kluczowe: Multi-fuel heating boiler wood pellets Substitute fuel Thermal tests Boiler optimal operating points
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Abstrakt

This paper presents a test stand equipped, among others, with two boilers intended for the combustion of solid fuels. The first is a single-fuel boiler designed to burn wood pellets only. The second is a multi-fuel boiler intended for the combustion of mainly hard coal (basic fuel) with the grain size of 0.005–0.025 m. Wood pellets can also be fired in this boiler, which in such a case are treated as a substitute fuel. There is a developed and verified algorithm for the control of the multi-fuel boiler operation in a wide range of loads for the basic fuel. However, for the substitute fuel (wood pellets) there are no documented and confirmed results of such testing. The paper presents selected results of testing performed during the combustion of wood pellets in a multi-fuel automatically stoked boiler. Several measuring series were carried out, for which optimal operating conditions were indicated. These conditions may serve as the basis for the development of the boiler operation control algorithm. A detailed analysis was carried out of the flue gas temperatures obtained at the outlet of the boiler combustion chamber and of the contents of carbon monoxide and oxygen in the boiler flue gases.
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Bibliografia

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Autorzy i Afiliacje

Wiesław Zima
1
Grzegorz Ojczyk
2
  1. Cracow University of Technology, Department of Energy, al. Jana Pawła II 37, 31-864 Kraków, Poland
  2. MTHE Modern Technologies in Heating Engineering, Młynska-Boczna 7/2, 31-470 Kraków, Poland
10 Thermal performance evaluation of an earth-to-air heat exchanger for the heating mode applications using an experimental test rig
Saif Nawaz Ahmad , Om Prakash
Archives of Thermodynamics | 2022 | vol. 43 | No 1 | 185-207 | DOI: 10.24425/ather.2022.140931
Słowa kluczowe: Heat transfer Earth-to-air heat exchanger Ground heat exchanger geothermal energy renewable energy Passive heating/cooling effectiveness
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Abstrakt

This paper presents the experimental investigation of an earthto- air heat exchanger for heating purposes in the Patna region of India, using an experimental test rig. In the view of the author, real field experiments have several limitations such as lack of repeatability and uncontrolled conditions. It also takes more time for the response of parameters that depends on nature and climate. Moreover, earth-to-air heat exchangers may be expensive to fabricate and require more land area. Thus, in this work authors executed their experimental work in indoor controllable environments to investigate the thermal performance of an earth-to-air heat exchanger. The actual soil conditions were created and maintained the temperature at 26˚C throughout the soil in the vicinity of pipes. Three horizontal PVC pipes of equal lengths and diameters of 0.0285 m, 0.038 m and 0.0485 m were installed in the test rig. The experiments were performed for different inlet air velocities at ambient air temperature. This study acknowledges that the maximum rise in outlet temperature occurs at a lower speed for smaller pipes. Also, the maximum effectiveness of 0.83 was observed at 2 m/s for the smallest diameter pipe.
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Autorzy i Afiliacje

Saif Nawaz Ahmad
1
Om Prakash
1
  1. National Institute of Technology Patna, Bihar 800005, India

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