发布求助
文献互助 智能选刊 最新文献

Heat Recovery Systems and CHP最新文献

筛选
英文 中文
Exergy analysis of radial inflow expansion turbines for power recovery 功率回收用径向入流膨胀轮机的火用分析
Heat Recovery Systems and CHP Pub Date : 1995-11-01 DOI: 10.1016/0890-4332(95)00005-J
Yousef M. Abdel-Rahim
{"title":"Exergy analysis of radial inflow expansion turbines for power recovery","authors":"Yousef M. Abdel-Rahim","doi":"10.1016/0890-4332(95)00005-J","DOIUrl":"10.1016/0890-4332(95)00005-J","url":null,"abstract":"<div><p>The paper presents an exergy analysis of the performance of a single-stage, radial-inflow expansion turbine. The analysis considers the effect of the design controlling parameters on the power output, and the first law and second law efficiencies of the turbine. The design parameters include: inlet temperature, wheel tip speed, exhaust Mach number and expansion pressure ratio. Limitations imposed by the second law of thermodynamics are presented and discussed, and the admissible ranges of variation of the controlling parameters are outlined and discussed. The analysis enables the process designer to quickly and realistically estimate the amount of power available from the exhaust gases of a process stream, the maximum effective pressure ratio and the temperature drop across the turbine and the exit Mach number.</p></div>","PeriodicalId":100603,"journal":{"name":"Heat Recovery Systems and CHP","volume":"15 8","pages":"Pages 775-785"},"PeriodicalIF":0.0,"publicationDate":"1995-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0890-4332(95)00005-J","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73322760","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: 9
Optimal analysis of primary performance parameters for an endoreversible absorption heat pump 内可逆吸收式热泵主要性能参数的优化分析
Heat Recovery Systems and CHP Pub Date : 1995-11-01 DOI: 10.1016/0890-4332(95)00004-I
Jincan Chen , Bjarne Andresen
{"title":"Optimal analysis of primary performance parameters for an endoreversible absorption heat pump","authors":"Jincan Chen ,&nbsp;Bjarne Andresen","doi":"10.1016/0890-4332(95)00004-I","DOIUrl":"10.1016/0890-4332(95)00004-I","url":null,"abstract":"<div><p>The cycle model of a heat-engine-driven heat pump is used to study the performance of an absorption heat pump affected by heat resistances. The coefficient of performance of the absorption heat pump is adopted to be the objective function for optimization. The optimal regions of the coefficient of performance and the specific heating load are determined. The optimal relations between the heat transfer areas of the four heat exchangers involved and the coefficient of performance, or the specific heating load of an absorption heat pump, are obtained. Problems concerning the optimal design of an absorption heat pump are also discussed.</p></div>","PeriodicalId":100603,"journal":{"name":"Heat Recovery Systems and CHP","volume":"15 8","pages":"Pages 723-731"},"PeriodicalIF":0.0,"publicationDate":"1995-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0890-4332(95)00004-I","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85467883","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: 34
A mixed cycle for converting heat to mechanical work 将热转化为机械功的混合循环
Heat Recovery Systems and CHP Pub Date : 1995-11-01 DOI: 10.1016/0890-4332(94)00083-W
V.E. Styliaras
{"title":"A mixed cycle for converting heat to mechanical work","authors":"V.E. Styliaras","doi":"10.1016/0890-4332(94)00083-W","DOIUrl":"10.1016/0890-4332(94)00083-W","url":null,"abstract":"<div><p>The subject of this study is to compare two different methods of converting heat to mechanical work. The first one is the well known Rankine cycle, which uses a pure substance as the working fluid. The second one is a power cycle which uses a mixture of substances with different boiling points as the working fluid. For convenience, this cycle will be called the mixed cycle hereafter.</p><p>Since the conventional Rankine cycle has been analyzed by many other authors, we will focus on the mixed cycle. The main difference between the two is that, in the mixed cycle, steam is released by heating a mixture. The initial working fluid is created as the expanded steam is absorbed by a mixture of lower concentration at lower temperature and pressure.</p><p>The main disadvantages of the mixed cycle are the upper temperature limit and the larger mass circulation.</p><p>In order to illustrate the “efficiency limits” of the mixed cycle, a theoretical analysis is presented, in which all processes are considered to be ideal.</p></div>","PeriodicalId":100603,"journal":{"name":"Heat Recovery Systems and CHP","volume":"15 8","pages":"Pages 749-753"},"PeriodicalIF":0.0,"publicationDate":"1995-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0890-4332(94)00083-W","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75643283","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: 2
Performance and cost analysis of two-pass solar air heaters 双通道太阳能空气加热器的性能与成本分析
Heat Recovery Systems and CHP Pub Date : 1995-11-01 DOI: 10.1016/0890-4332(95)00003-H
C. Choudhury, P.M. Chauhan, H.P. Garg
{"title":"Performance and cost analysis of two-pass solar air heaters","authors":"C. Choudhury,&nbsp;P.M. Chauhan,&nbsp;H.P. Garg","doi":"10.1016/0890-4332(95)00003-H","DOIUrl":"10.1016/0890-4332(95)00003-H","url":null,"abstract":"<div><p>In this study the ratio of the annual cost and the annual energy gain has been calculated for two-pass solar air heaters with single and double covers above the absorber. The cost-benefit ratios of the collectors are examined over a wide range of design and operational parameter (ṁ, <em>L</em>, <em>D</em>1 and <em>D</em>2) and compared with those of single-pass collectors with no cover, a single cover and a double cover, as studied by the authors previously. For shorter duct lengths and lower air mass flow rates, the performance of the two-pass air heater with a single cover is found to be most cost-effective, as compared to the other designs.</p></div>","PeriodicalId":100603,"journal":{"name":"Heat Recovery Systems and CHP","volume":"15 8","pages":"Pages 755-773"},"PeriodicalIF":0.0,"publicationDate":"1995-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0890-4332(95)00003-H","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84190813","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: 57
A new instrument for radiation heat flux measurement—analysis and parameter selection 一种新型辐射热通量测量仪器——分析与参数选择
Heat Recovery Systems and CHP Pub Date : 1995-11-01 DOI: 10.1016/0890-4332(94)00082-V
N. Martins , M.G. Carvalho , N.H. Afgan, A.I. Leontiev
{"title":"A new instrument for radiation heat flux measurement—analysis and parameter selection","authors":"N. Martins ,&nbsp;M.G. Carvalho ,&nbsp;N.H. Afgan,&nbsp;A.I. Leontiev","doi":"10.1016/0890-4332(94)00082-V","DOIUrl":"10.1016/0890-4332(94)00082-V","url":null,"abstract":"<div><p>In a number of combustion chambers, differentiation between radiation and convective heat transfer on the surface is a problem of substantial interest. The hemispherical radiation heat flux meter proposed by Afgan and Leontiev [I] and patented by Afgan, Carvalho, Martins and Leontiev [2] has potential to be used as an instrument with sufficient accuracy to measure the difference between hemispherical radiation heat flux and convective heat flux in the respective environments.</p><p>The hemispherical radiation flux meter is numerically analyzed with the aim of defining the optimal design parameters to be used for experimental verification. With a proper selection of the design parameters corresponding to the conditions encountered in the boiler furnace, it will be possible to measure with the same instrument the radiation heat flux and convective heat flux.</p><p>Particular attention was focused on the discussion of the respective parameters of the flux meter in order to meet corresponding requirements in different environments. Attention was focused on the effects of differences in main mass flow rate and blow-off gas mass flow rate, heat conductivity of the holder and porous filament and the difference in temperature between solid structure and fluid flow in the filament.</p><p>For the selected parameters of the main flow and radiation heat flux range, the radiation heat flux meter was designed.</p></div>","PeriodicalId":100603,"journal":{"name":"Heat Recovery Systems and CHP","volume":"15 8","pages":"Pages 787-796"},"PeriodicalIF":0.0,"publicationDate":"1995-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0890-4332(94)00082-V","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87541492","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: 16
An analytical superposition approach to wall heat conduction under arbitrary temperature perturbations for air-conditioning applications 空调应用中任意温度扰动下墙体热传导的解析叠加法
Heat Recovery Systems and CHP Pub Date : 1995-11-01 DOI: 10.1016/0890-4332(94)00087-2
K.A. Antonopoulos, F. Democritou
{"title":"An analytical superposition approach to wall heat conduction under arbitrary temperature perturbations for air-conditioning applications","authors":"K.A. Antonopoulos,&nbsp;F. Democritou","doi":"10.1016/0890-4332(94)00087-2","DOIUrl":"10.1016/0890-4332(94)00087-2","url":null,"abstract":"<div><p>An analytical solution is derived for the transient wall heat conduction problem under arbitrary outdoor air temperature perturbations. This is obtained by expanding the arbitrary perturbation in a Fourier series, consisting of a step function and an infinite sum of cosine and sine functions. The analytical solutions in the cases of step, cosine and sine temperature perturbations are derived separately from each other and are then superimposed to produce the resultant solution. Simple linear expressions are derived, which express the maximum indoor heat flow provoked by the arbitrary temperature perturbation in terms of parameters characterizing the perturbation. Such simple expressions are very useful in air-conditioning calculations for predicting peak loads and sizing heating or cooling equipment.</p></div>","PeriodicalId":100603,"journal":{"name":"Heat Recovery Systems and CHP","volume":"15 8","pages":"Pages 733-747"},"PeriodicalIF":0.0,"publicationDate":"1995-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0890-4332(94)00087-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82902536","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: 5
The exergy carry-over index for a utility system 公用事业系统的能量结转指数
Heat Recovery Systems and CHP Pub Date : 1995-11-01 DOI: 10.1016/0890-4332(94)00086-Z
M. Fehr
{"title":"The exergy carry-over index for a utility system","authors":"M. Fehr","doi":"10.1016/0890-4332(94)00086-Z","DOIUrl":"10.1016/0890-4332(94)00086-Z","url":null,"abstract":"<div><p>An exergy analysis has been conducted for the utility system of an integrated sugar cane processing plant. A 22 MW boiler supplies steam to five turbines. The availability or exergy analysis establishes the amount of chemical and thermal energy that can possibly be transformed into work. Of the 100 units of available energy from the fuel, only 62.2 units are exergy. The steam cycle absorbs 60.3 energy units, of which 21.0 are exergy. The exergy carry-over index for the boiler is 0.56. The steam transfers to the turbines 2.2 energy units, all of which are exergy. The index is 2.86 for the steam cycle and 1.61 for the combined installation.</p></div>","PeriodicalId":100603,"journal":{"name":"Heat Recovery Systems and CHP","volume":"15 8","pages":"Pages 797-801"},"PeriodicalIF":0.0,"publicationDate":"1995-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0890-4332(94)00086-Z","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81119345","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: 2
The jet-pump cycle—A low cost refrigerator option powered by waste heat 喷射泵循环-一种低成本的冰箱选择，由废热提供动力
Heat Recovery Systems and CHP Pub Date : 1995-11-01 DOI: 10.1016/0890-4332(95)00006-K
I.W. Eames, S. Aphornratana, Da-Wen Sun
{"title":"The jet-pump cycle—A low cost refrigerator option powered by waste heat","authors":"I.W. Eames,&nbsp;S. Aphornratana,&nbsp;Da-Wen Sun","doi":"10.1016/0890-4332(95)00006-K","DOIUrl":"10.1016/0890-4332(95)00006-K","url":null,"abstract":"<div><p>A perennial problem with waste heat is the capital cost of plant required to make its utilisation justifiable. A good example of this is the use of waste heat to power absorption refrigerators. The capital cost of absorption refrigerators rises sharply as the temperature of the heat source falls, making waste heat recovery and use uneconomic. This paper describes and evaluates the potential of the jet-pump cycle as a low capital cost option for providing refrigeration utilising low grade waste heat. A brief literature review is provided. An experimental jet-pump refrigerator is described, experimental results are presented and evaluated and the cost benefits of jet-pump refrigerators compared with vapour compression systems are discussed.</p></div>","PeriodicalId":100603,"journal":{"name":"Heat Recovery Systems and CHP","volume":"15 8","pages":"Pages 711-721"},"PeriodicalIF":0.0,"publicationDate":"1995-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0890-4332(95)00006-K","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83256663","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: 44
Feasibility and design studies for heat recovery from a refrigeration system with a canopus heat exchanger 带顶盖换热器制冷系统热回收的可行性与设计研究
Heat Recovery Systems and CHP Pub Date : 1995-10-01 DOI: 10.1016/0890-4332(95)90046-2
S.C. Kaushik, M. Singh
{"title":"Feasibility and design studies for heat recovery from a refrigeration system with a canopus heat exchanger","authors":"S.C. Kaushik,&nbsp;M. Singh","doi":"10.1016/0890-4332(95)90046-2","DOIUrl":"10.1016/0890-4332(95)90046-2","url":null,"abstract":"<div><p>This paper presents an investigation of the feasibility of heat recovery from the condenser of a vapour compression refrigeration (VCR) system through a Canopus heat exchanger (CHE) between the compressor and condenser components. The presence of the CHE makes it possible to recover the superheat of the discharged vapour and utilize it for increasing the temperature of the external fluid (water) removing heat from the condenser. The effects of the operating temperatures in the condenser and evaporator for different inlet water temperatures and mass flow rates on the heat recovery output and its distribution over the condenser and CHE (the fraction of the condenser heat available through the CHE), available outlet water temperature and heat recovery factor have all been studied and optimum operating parameters for feasible heat recovery have been ascertained. The parametric results obtained for different working fluids, such as R-22, R-12, R-717 and R-500, have been presented. It is found that, in general, a heat recovery factor of the order of 2.0 and 40% of condenser heat can be recovered through the Canopus heat exchanger for a typical set of operating conditions.</p></div>","PeriodicalId":100603,"journal":{"name":"Heat Recovery Systems and CHP","volume":"15 7","pages":"Pages 665-673"},"PeriodicalIF":0.0,"publicationDate":"1995-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0890-4332(95)90046-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76940140","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: 30
Computer simulation of a combined cycle power plant 联合循环电厂的计算机模拟
Heat Recovery Systems and CHP Pub Date : 1995-10-01 DOI: 10.1016/0890-4332(95)90042-X
B. Seyedan , P.L. Dhar , R.R. Gaur , G.S. Bindra
{"title":"Computer simulation of a combined cycle power plant","authors":"B. Seyedan ,&nbsp;P.L. Dhar ,&nbsp;R.R. Gaur ,&nbsp;G.S. Bindra","doi":"10.1016/0890-4332(95)90042-X","DOIUrl":"10.1016/0890-4332(95)90042-X","url":null,"abstract":"<div><p>This paper presents the simulation procedure developed to predict the performance of a combined cycle power plant from given performance characteristics of its main components. In order that the procedure could be validated, the simulation technique has been applied to a typical combined cycle power plant (having a dual pressure bottoming cycle) manufactured by a prominent company. The characteristics of the standard equipment like the air compressor, steam and gas turbines, various pumps, etc. have been taken from the manufacturer's catalogues and converted into appropriate equations based on theoretical understanding. The performance of various heat exchangers (like economizers, superheaters, evaporators, etc.) has been determined by using the effectiveness concept after evaluating the overall heat transfer coefficient by using appropriate correlations from literature. The strategy of system simulation is obtained by judiciously interlinking the information flow diagrams of various components and thus the task is finally reduced to that of solving nine non-linear equations for nine variables. The predicted performance of the system is seen to be in good agreement with in good agreement with its rated performance.</p></div>","PeriodicalId":100603,"journal":{"name":"Heat Recovery Systems and CHP","volume":"15 7","pages":"Pages 619-630"},"PeriodicalIF":0.0,"publicationDate":"1995-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0890-4332(95)90042-X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75558328","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: 11
下一页 尾页
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整，为了账户安全，请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
请完成安全验证×
相关产品
×
本文献相关产品
联系我们：info@booksci.cn Book学术提供免费学术资源搜索服务，方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号：481959085
Book学术官方微信