Archives of Thermodynamics最新文献_第5页

Economic effectiveness evaluation of the free piston Stirling engine-based micro-combined heat and power unit in relation to classical systems 基于自由活塞斯特林发动机的微型热电联产机组与经典系统的经济性评价

IF 0.9

Archives of Thermodynamics Pub Date : 2023-07-20 DOI: 10.24425/ather.2019.128290

W. Uchman, L. Remiorz, J. Kotowicz

{"title":"Economic effectiveness evaluation of the free piston Stirling engine-based micro-combined heat and power unit in relation to classical systems","authors":"W. Uchman, L. Remiorz, J. Kotowicz","doi":"10.24425/ather.2019.128290","DOIUrl":"https://doi.org/10.24425/ather.2019.128290","url":null,"abstract":"In this article, a comparison of economic effectiveness of various heating systems dedicated to residential applications is presented: a natural gas-fueled micro-cogeneration (micro-combined heat and power – μCHP) unit based on a free-piston Stirling engine that generates additional electric energy; and three so-called classical heating systems based on: gas boiler, coal boiler, and a heat pump. Calculation includes covering the demand for electricity, which is purchased from the grid or produced in residential system. The presented analyses are partially based on an experimental investigation. The measurements of the heat pump system as well as those of the energy (electricity and heat) demand profiles in the analyzed building were conducted for a single-family house. The measurements of the μCHP unit were made using a laboratory stand prepared for simulating a variable heat demand. The overall efficiency of the μCHP was in the range of 88.6– 92.4%. The amounts of the produced/consumed energy (electricity, heat, and chemical energy of fuel) were determined. The consumption and the generation of electricity were settled on a daily basis. Operational costs of the heat pump system or coal boiler based heating system are lower comparing to the micro-cogeneration, however no support system for natural gas-based μCHP system is included.","PeriodicalId":45257,"journal":{"name":"Archives of Thermodynamics","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44922308","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Quantity and quality of marine dual-fuel engine’s exhaust sensible waste heat considering different sulfur content in fuels 考虑不同燃料含硫量的船用双燃料发动机排气显余热的数量和质量

IF 0.9

Archives of Thermodynamics Pub Date : 2023-07-20 DOI: 10.24425/ather.2020.135857

M. Przybyła

{"title":"Quantity and quality of marine dual-fuel engine’s exhaust sensible waste heat considering different sulfur content in fuels","authors":"M. Przybyła","doi":"10.24425/ather.2020.135857","DOIUrl":"https://doi.org/10.24425/ather.2020.135857","url":null,"abstract":"Maritime transport is facing a set of technical challenges due to implementation of ecological criterions on 1st Jan. 2020 and 2021 by the International Maritime Organization. The advantageous properties of natural gas (NG) as fuel in conjunction with dual-fuel (DF) internal combustion engines (ICE) potentially enables the fulfilment of all criterions. Moreover the 2020 global sulfur cap in combination with its low content in NG potentially enables to recover higher rates of waste heat and exergy of exhaust gas without the risk of low temperature corrosion. In this study the influence of sulfur content in NG and pilot fuel oil (PFO) on the sulfuric acid condensation temperature was investigated in order to determine the rate of waste heat (quantity) and exergy (quality) of four-stroke DF IC engine’s exhaust for 50%, 85% and 100% of engine load. Determined parameters were compared with two sets of reference values calculated for the same engine: a) fueled with NG and PFO with fixed minimum exhaust temperature set as 423.15 K, b) fueled with 3.5% sulfur mass fraction fuel oil only with variable minimum exhaust gas temperature. The results show that the assumption of case a) can lead to significant reduction of recovered rates of exhaust waste heat and exergy in the ranges of 10% to 24% and 43% to 57%, respectively. Higher values were obtained for case b) where the ranges of unrecovered rate of heat and exergy achieved 20% to 38% and 60% to 70%.","PeriodicalId":45257,"journal":{"name":"Archives of Thermodynamics","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47004268","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Mathematical modeling of hydrogen production performance in thermocatalytic reactor based on the intermetallic phase of Ni3Al 基于Ni3Al金属间相的热催化反应器制氢性能数学建模

IF 0.9

Archives of Thermodynamics Pub Date : 2023-07-20 DOI: 10.24425/ATHER.2019.129547

J. Badur, M. Stajnke, P. Ziółkowski, P. Jóźwik, Z. Bojar, P. Ziółkowski

引用次数: 8

Application of innovative solutions to improve the efficiency of the LPC flow part of the 220 MW NPP steam turbine 应用创新解决方案提高220兆瓦核电厂汽轮机LPC流动部分的效率

IF 0.9

Archives of Thermodynamics Pub Date : 2023-07-20 DOI: 10.24425/ather.2022.140925

A. Rusanov, Viktor H. Subotin, V. Shvetsov, Roman RUSANOVa, Serhii A. Palkov, I. Palkov, M. Chugay

{"title":"Application of innovative solutions to improve the efficiency of the LPC flow part of the 220 MW NPP steam turbine","authors":"A. Rusanov, Viktor H. Subotin, V. Shvetsov, Roman RUSANOVa, Serhii A. Palkov, I. Palkov, M. Chugay","doi":"10.24425/ather.2022.140925","DOIUrl":"https://doi.org/10.24425/ather.2022.140925","url":null,"abstract":"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 low-pressure 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.","PeriodicalId":45257,"journal":{"name":"Archives of Thermodynamics","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47478978","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Application of computer image analyzes in the investigation of refrigerants condensation in minichannels 计算机图像分析在微通道制冷剂冷凝研究中的应用

IF 0.9

Archives of Thermodynamics Pub Date : 2023-07-20 DOI: 10.24425/ATHER.2019.128292

M. Sikora, T. Bohdal

引用次数: 3

Identification of unsteady effects in the flow through a centrifugal fan using CFD/CAA methods 利用CFD/CAA方法识别离心风机流动中的非定常效应

IF 0.9

Archives of Thermodynamics Pub Date : 2023-07-20 DOI: 10.24425/ather.2021.139657

引用次数: 1

The cooling rate of the heated vapor compression cycle in case of using refrigerants R134a, R22, and R600a 使用制冷剂R134a、R22、R600a时，加热蒸汽压缩循环的冷却速率

IF 0.9

Archives of Thermodynamics Pub Date : 2023-07-20 DOI: 10.24425/ather.2021.137550

Mohamed Salama ABD-ELHADYa, Emmanoueil Bishara Melad, Mohamed S. Abd-Elhalim, Seif A. Ahmed

{"title":"The cooling rate of the heated vapor compression cycle in case of using refrigerants R134a, R22, and R600a","authors":"Mohamed Salama ABD-ELHADYa, Emmanoueil Bishara Melad, Mohamed S. Abd-Elhalim, Seif A. Ahmed","doi":"10.24425/ather.2021.137550","DOIUrl":"https://doi.org/10.24425/ather.2021.137550","url":null,"abstract":"The most power consuming part in the vapor compression cycle (VCC) is the gas compressor. Heating the refrigerant under constant volume after the compressor increases the condenser pressure, which consequently increases the cooling rate of the VCC. This study examined the inﬂuence of heating diﬀerent refrigerants, i.e. R143a, R22, and R600a on the cooling rate of the VCC. Four experiments have been performed: the ﬁrst experiment is a normal VCC, i.e. without heating, while in the second, third, and fourth experiments were carried out to raise the temperature of the refrigerant to 50 ◦ C, 100 ◦ C, and 150 ◦ C. It has been found that heating raises the refrigerant pressure in VCC and thereby improves the refriger-ant’s mass ﬂow rate resulting in an improvement in the cooling power for the same compressor power. Heating the refrigerant after the mechanical compressor increases the temperature of the condenser as well as the temperature of the evaporator when using refrigerant R134a, which prevents the refrigeration cycle to be used in freezing applications, however using re-frigerant R22 or refrigerant R600a promotes the heated VCC to be used in","PeriodicalId":45257,"journal":{"name":"Archives of Thermodynamics","volume":"1 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68945481","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Transient heat transfer as a leading factor in fatigue of thick-walled elements at power plants 瞬态传热是电厂厚壁元件疲劳的主要因素

IF 0.9

Archives of Thermodynamics Pub Date : 2023-07-20 DOI: 10.24425/ATHER.2019.129549

K. Wacławiak, J. Okrajni

引用次数: 2

Performance analysis and PCM selection for adsorption chiller aided by energy storage supplied from the district heating system 区域供热系统储能辅助吸附式制冷机性能分析及PCM选择

IF 0.9

Archives of Thermodynamics Pub Date : 2023-07-20 DOI: 10.24425/ather.2022.144409

J. Karwacki

引用次数: 0

A comprehensive review on energy and exergy analysis of solar air heaters 太阳能空气加热器的能量与火用分析综述

IF 0.9

Archives of Thermodynamics Pub Date : 2023-07-20 DOI: 10.24425/ather.2020.134577

Harish Kumar Ghritlahre, P. Sahu

{"title":"A comprehensive review on energy and exergy analysis of solar air heaters","authors":"Harish Kumar Ghritlahre, P. Sahu","doi":"10.24425/ather.2020.134577","DOIUrl":"https://doi.org/10.24425/ather.2020.134577","url":null,"abstract":"For economic growth of nation, the energy plays an important role. The excessive use of fossil fuels results the increase in global warming and depleting the resources. Due to this reason, the renewable energy sources are creating more attraction for researchers. In renewable energy sector, solar energy is the most abundant and clean source of energy. In solar thermal systems, solar air heater (SAH) is the main system which is used for heating of air. As it is simple in construction and cheaper in cost, it is of main interest for the researchers. The concept of ﬁrst law and second law of thermodynamics is used for the study of the energy and exergy analysis respectively. The energy analysis is of great importance for the study of process eﬀectiveness while the exergetic analysis is another significant concept to examine the actual behavior of process involving various energy losses and internal irreversibility. For eﬃcient utilization of solar energy, the exergy analysis is very important tool for optimal design of solar air heaters. The aim of the present work is to review the works related to energy and exergy analysis of various types of solar air heaters and to ﬁnd out the research gap for future work.","PeriodicalId":45257,"journal":{"name":"Archives of Thermodynamics","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48367440","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 7