Thermal Science and Engineering Progress最新文献

On the effect of a tangential intake on the performance of natural dry draft cooling towers in crosswind conditions 切向进气口对横风条件下自然干式通风冷却塔性能的影响

IF 5.1 3区工程技术

Thermal Science and Engineering Progress Pub Date : 2024-11-16 DOI: 10.1016/j.tsep.2024.103036

Behzad Zakeri , Morteza Khashehchi , Pooyan Rahmanivahid , Milad Heidari

{"title":"On the effect of a tangential intake on the performance of natural dry draft cooling towers in crosswind conditions","authors":"Behzad Zakeri , Morteza Khashehchi , Pooyan Rahmanivahid , Milad Heidari","doi":"10.1016/j.tsep.2024.103036","DOIUrl":"10.1016/j.tsep.2024.103036","url":null,"abstract":"<div><div>Crosswind has a negative effect on the performance of natural draft dry cooling towers, NDDCTs, serving thermal power plants. This, in turn, lowers the efficiency of the thermal power plant as less heat can be rejected to the ambient air through the tower. This occurs due to interaction of cross wind and cooling tower structure. This phenomenon leads to generation of primary and secondary vortices inside the tower which located in leeward side (downwind side) and windward side (upwind side) of the tower, respectively. In an innovative interpretation of the challenge, this paper aims at directing the crosswind flow through the tower shell above the heat exchangers to assist the buoyancy-induced plume. In particular, the intake of the crosswind through the tower is utilized as a tangentially-induced swirl source to help the upward draft, and its penetration in the ambient air, enhancing the tower performance which otherwise would have been significantly deteriorated. Two independent approaches are presented to assess the proposed design quantitatively. CFD simulation of a small scale tower model has revealed significant performance improvement (in terms of natural draft blockage and outlet flow velocity) when the crosswind is allowed to penetrate the tower shell, through an opening on the tower side-wall, above the heat exchangers. Results of the simulations have been validated against the experimental data collected using the tests ran on an identical model, with and without the side opening, in a wind tunnel.</div></div>","PeriodicalId":23062,"journal":{"name":"Thermal Science and Engineering Progress","volume":"56 ","pages":"Article 103036"},"PeriodicalIF":5.1,"publicationDate":"2024-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142654287","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

6E evaluation of an innovative humidification dehumidification solar distiller unit: An experimental investigation 6E 评估创新的加湿除湿太阳能蒸馏器装置：实验研究

IF 5.1 3区工程技术

Thermal Science and Engineering Progress Pub Date : 2024-11-14 DOI: 10.1016/j.tsep.2024.103052

A.S. Abdullah , Mamoun M. Elsayad , Sulaiman Almoatham , Swellam W. Sharshir

{"title":"6E evaluation of an innovative humidification dehumidification solar distiller unit: An experimental investigation","authors":"A.S. Abdullah , Mamoun M. Elsayad , Sulaiman Almoatham , Swellam W. Sharshir","doi":"10.1016/j.tsep.2024.103052","DOIUrl":"10.1016/j.tsep.2024.103052","url":null,"abstract":"<div><div>This work aims to enhance the productivity, efficiency, energy utilization, feasibility, and environmental outcomes of solar desalination systems via representing an innovative humidification dehumidification solar distillation unit coupled with a built-in air solar heater and photovoltaic thermal unit. The air solar heater was further improved by the incorporation of copper chips as thermal energy-storing materials for extending the desalination process during the sun’s hours. Three distinct humidifier beds, including plastic waste (case A), wick materials (case B), and cellulose paper (case C) were tested and compared regarding system temperatures and hourly and daily drinkable water yield. Additionally, a 6E analysis was assessed and evaluated in terms of energy, exergy, economic, exergoeconomic, exergoenvironmental, and exergoenviroeconomic analysis for all the cases. According to the outcomes, the humidification dehumidification solar distiller with cellulose paper yielded the highest productivity and 6E outcomes where the daily drinkable water, thermal efficiency, and exergy efficiency were estimated as 7.78 L/m<sup>2</sup>, 73.45 %, and 5.3 %, outperforming the CSD by nearly 142.59 %, 144.02 %, and 229.19 %, respectively. Moreover, the price of drinkable water and the payback time decreased to 0.0099 $/L and 0.12 years, which represents a reduction of 68.27 % and 69.23 %, respectively, at an exergoeconomic factor of 4.19 kWh/$. Furthermore, the amount of CO<sub>2</sub> reduced was increased to 3.92 tons, which is associated with earned credits of carbon of 56.78$. Finally, for this case, the HDH humidifier efficiency, dehumidifier effectiveness, and gain output ratio maximum and mean values were 96.66 and 84.5 %, 85.61 and 78.96 %, and 1.86 and 1.08, respectively.</div></div>","PeriodicalId":23062,"journal":{"name":"Thermal Science and Engineering Progress","volume":"56 ","pages":"Article 103052"},"PeriodicalIF":5.1,"publicationDate":"2024-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142654343","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Seasonal performance comparison of R-410A and R-454B in a variable-speed air-cooled scroll chiller 变速风冷涡旋式制冷机中 R-410A 和 R-454B 的季节性性能比较

IF 5.1 3区工程技术

Thermal Science and Engineering Progress Pub Date : 2024-11-12 DOI: 10.1016/j.tsep.2024.103050

Avinash Kumar , Nitin Karwa , Ankit Sethi , Nilesh Purohit

{"title":"Seasonal performance comparison of R-410A and R-454B in a variable-speed air-cooled scroll chiller","authors":"Avinash Kumar , Nitin Karwa , Ankit Sethi , Nilesh Purohit","doi":"10.1016/j.tsep.2024.103050","DOIUrl":"10.1016/j.tsep.2024.103050","url":null,"abstract":"<div><div>In recent years, there has been increasing concern about the impact of air conditioning and refrigeration on global warming. This is particularly related to the emissions of refrigerants with high global warming potentials (GWP), such as R-410A, which is used in air conditioning and chiller systems. There has been a concerted effort within the HVAC industry to find lower GWP refrigerants to replace R-410A in HVAC systems. In this paper, a 10.5 kW (3 TR) air-cooled variable-speed scroll chiller has been utilized to conduct an experimental comparison of R-410A (GWP of 2088) and its low GWP A2L alternative R-454B (GWP of 466) according to AHRI 551/591 testing condition at rating and part load condition with optimized charge. The compressor speed and suction superheat were matched for both refrigerants at all the test conditions. R-454B shows 98 % capacity and 102 % efficiency compared to R-410A at rating conditions of 35 °C outdoors and water return temperature of 12 °C. The IPLV of the R-454B chiller was just 1 % higher than R-410A. The discharge temperature of R-454B and compressor isentropic efficiency is 8 % higher and almost like R-410A, respectively. The optimized charge of R-454B was 5 % lower refrigerant charge compared to R-410A. The LCCP analysis for major Indian cities over a 15-year operational span demonstrates a notable reduction, ranging from 6.6 % to 7.3 %, in overall R-454B emissions compared to R-410A. The study demonstrates that R-454B is a drop-in replacement to R-410A designs and reduces the direct GHG emission from the chiller by 76 %.</div></div>","PeriodicalId":23062,"journal":{"name":"Thermal Science and Engineering Progress","volume":"56 ","pages":"Article 103050"},"PeriodicalIF":5.1,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142654347","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A thermo-economic comparison on new and conventional alternatives of pressurization of CO2 in CCS systems 二氧化碳捕获和封存系统中二氧化碳加压的新型和传统替代方法的热经济比较

IF 5.1 3区工程技术

Thermal Science and Engineering Progress Pub Date : 2024-11-10 DOI: 10.1016/j.tsep.2024.103046

S. Khalili, L.Garousi Frashi

{"title":"A thermo-economic comparison on new and conventional alternatives of pressurization of CO2 in CCS systems","authors":"S. Khalili, L.Garousi Frashi","doi":"10.1016/j.tsep.2024.103046","DOIUrl":"10.1016/j.tsep.2024.103046","url":null,"abstract":"<div><div>The final stage of carbon capture and storage processes involves the pressurization of CO<sub>2</sub> by a suitable method which is conventionally carried out through a series of compressors with intercoolers in between them. In the present study, the idea of liquefying the captured CO<sub>2</sub> is considered. Four different systems for the liquefaction process are evaluated and compared Thermo-economically with the benchmark system of direct carbon dioxide compression. The results indicate that the EPLS system outperforms the others, with a product cost 5.89% lower than the benchmark system. Evaluations show that most of the costs are imposed by the initial compression stage in each system. A detailed investigation of the sensitivity analysis shows that the benchmark and claude systems have the largest dependency on pressure ratio and intercooling temperature, respectively. Additionally, evaluation of the economic parameters indicates that the changes in unit cost of power have the most effect on the benchmark system while the interest rate affects the results of claude and DEBARS more than other options. Detailed evaluations reveal that the EPLS layout has the advantage of less dependency on the changes of operating parameters and on the other hand, the cost of input heat, the maintenance factor, and the generator and evaporator temperatures make a high difference in the final product cost of the DEBARS. Finally, the effect of pressure drops in heat exchangers is investigated and results reveal that the consideration of pressure drops leads to power penalties ranging from 0.97 to 8.52 $/hr in different systems.</div></div>","PeriodicalId":23062,"journal":{"name":"Thermal Science and Engineering Progress","volume":"56 ","pages":"Article 103046"},"PeriodicalIF":5.1,"publicationDate":"2024-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142654346","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Predictive modeling for dynamic heat load in frigid railway roadbeds: An energy-efficient approach 寒冷铁路路基动态热负荷预测模型：节能方法

IF 5.1 3区工程技术

Thermal Science and Engineering Progress Pub Date : 2024-11-10 DOI: 10.1016/j.tsep.2024.103049

Tianfei Hu , Liqi Zhao , Tengfei Wang , Zurun Yue , Yifei Yuan

{"title":"Predictive modeling for dynamic heat load in frigid railway roadbeds: An energy-efficient approach","authors":"Tianfei Hu , Liqi Zhao , Tengfei Wang , Zurun Yue , Yifei Yuan","doi":"10.1016/j.tsep.2024.103049","DOIUrl":"10.1016/j.tsep.2024.103049","url":null,"abstract":"<div><div>This research presents an innovative approach to dynamic heat load prediction in railway roadbeds situated in cold climates by incorporating the concept of heat load, traditionally used in the building sector. The method facilitates a comprehensive evaluation and energy-efficient control of heating systems in these specialized transportation infrastructures. Utilizing an integrated building simulation toolkit (DeST), a computational model for roadbed micro-elements is established, integrating weather, radiation, and shading models to simulate pertinent environmental factors. Employing the state space method, a thermal module calculates the base temperature of these micro-elements. Subsequent calculations determine the roadbed’s target temperature and temporal heat load. Empirical data from the Harbin-Qiqihar high-speed railway validates the method, revealing strong alignment between computed and measured roadbed temperatures. Heat load peaks at 945 W/m and averages 335 W/m in freezing conditions. The method accounts for thermal hysteresis and variations related to roadbed orientation and depth. Regional statistics show a heat load range of 531 to 1,338 W/m and establish a direct correlation between heat load and latitude. The findings significantly enhance the ability to assess frost damage and design energy-efficient heating plans for railway roadbeds in frigid environments.</div></div>","PeriodicalId":23062,"journal":{"name":"Thermal Science and Engineering Progress","volume":"56 ","pages":"Article 103049"},"PeriodicalIF":5.1,"publicationDate":"2024-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142654345","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A study on the factors influencing the transient deformation characteristics of compressor cylinders based on thermal–mechanical coupling 基于热机械耦合的压缩机气缸瞬态变形特性影响因素研究

IF 5.1 3区工程技术

Thermal Science and Engineering Progress Pub Date : 2024-11-09 DOI: 10.1016/j.tsep.2024.103044

Guoxu Zhang, Zhiqiang Huang, Cheng Wang, Zhenye Li, Shichaun Tan, Biao Xu

{"title":"A study on the factors influencing the transient deformation characteristics of compressor cylinders based on thermal–mechanical coupling","authors":"Guoxu Zhang, Zhiqiang Huang, Cheng Wang, Zhenye Li, Shichaun Tan, Biao Xu","doi":"10.1016/j.tsep.2024.103044","DOIUrl":"10.1016/j.tsep.2024.103044","url":null,"abstract":"<div><div>The deformation of the reciprocating compressor seriously affects the efficiency and reliability of the shale gas extraction unit. In order to study the deformation characteristics and influencing factors, this paper established a coupled system model of reciprocating compressor cylinder block-piston assembly, proposed a transient calculation method applicable to the 3D compressor cylinder model, and studied and analyzed the heat transfer characteristics, deformation characteristics, and main factors influencing the deformation of each component in one cycle. The results show that the temperature of the compressor cylinder shows a “W”-type trend, with low temperature fluctuation; the stress and deformation of the cylinder block are almost unchanged, and the stress of the piston fluctuates greatly, with a maximum fluctuation of 14.37 MPa; the temperature and deformation of the compressor cylinder block-piston assembly show the distribution characteristics of ‘high out and low in’; the maximum deformation of the cylinder block at the extreme moment is 0.298 mm; the piston ring expands and deforms on the exhaust side, and shrinks on the intake side, the maximum deformation is 0.089 mm at the extreme moment; thermal load has a greater influence on the deformation of the working chamber and piston ring.</div></div>","PeriodicalId":23062,"journal":{"name":"Thermal Science and Engineering Progress","volume":"56 ","pages":"Article 103044"},"PeriodicalIF":5.1,"publicationDate":"2024-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142654286","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Role of constraint volume and heat flux on the design of evaporator tubes of steam generator by entropy generation minimization 通过熵生成最小化设计蒸汽发生器蒸发管时约束体积和热通量的作用

IF 5.1 3区工程技术

Thermal Science and Engineering Progress Pub Date : 2024-11-08 DOI: 10.1016/j.tsep.2024.103043

Md Naim Hossain , Koushik Ghosh

{"title":"Role of constraint volume and heat flux on the design of evaporator tubes of steam generator by entropy generation minimization","authors":"Md Naim Hossain , Koushik Ghosh","doi":"10.1016/j.tsep.2024.103043","DOIUrl":"10.1016/j.tsep.2024.103043","url":null,"abstract":"<div><div>This paper proposes a design methodology for evaporator tubes of a steam generator by applying the entropy generation minimization (EGM) approach. A two-phase flow-based entropy generation model for steam generator evaporator tubes is developed, with coolant volume as a constraint. For a target steam generation rate, the total entropy generation of the evaporator circuit is minimized using system volume and furnace heat flux as two constraints. It is observed that for a fixed steam generation rate, with increasing evaporator diameter, the furnace height decreases while the cross-sectional area increases. The analysis reveals that for a steam generation rate of 100 kg/s and a fixed circuit volume of 47 m<sup>3</sup>, increasing the heat flux from 36 to 50 kW/m<sup>2</sup> shifts the EGM point from an evaporator diameter of 62 mm to 84 mm, respectively. On the other hand, the minimum point shifts to a diameter of 43 mm when the heat flux is decreased to 25 kW/m<sup>2</sup>. The present study concludes that the selection of the constraint volume for designing the evaporator downcomer circuit for a target steam generation rate should be done based on the available furnace heat flux to choose the most efficient design.</div></div>","PeriodicalId":23062,"journal":{"name":"Thermal Science and Engineering Progress","volume":"56 ","pages":"Article 103043"},"PeriodicalIF":5.1,"publicationDate":"2024-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142654285","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Investigation on the integrated characteristics of n-decane/air rotating detonation combustor and supersonic turbine 正癸烷/空气旋转爆燃燃烧器和超音速涡轮机综合特性研究

IF 5.1 3区工程技术

Thermal Science and Engineering Progress Pub Date : 2024-11-06 DOI: 10.1016/j.tsep.2024.103040

Wei Zhang, Ningbo Zhao, Xiaofeng Shao, Hongtao Zheng

{"title":"Investigation on the integrated characteristics of n-decane/air rotating detonation combustor and supersonic turbine","authors":"Wei Zhang, Ningbo Zhao, Xiaofeng Shao, Hongtao Zheng","doi":"10.1016/j.tsep.2024.103040","DOIUrl":"10.1016/j.tsep.2024.103040","url":null,"abstract":"<div><div>In this study, the two-dimensional numerical simulations are conducted to study the flow field characteristics, turbine performance and loss mechanism of integrated system of rotating detonation combustor and supersonic turbine under two different directions of detonation wave propagation. The results indicate that the propagation direction of RDW affects the incident angle between OSW and guide vanes, resulting in different operating modes for aligned and unaligned modes. OSW in the turbine cascade undergoes the leading-edge shock, blade surface reflection and trailing edge diffraction. The backward-propagating rake-type shock envelope is formed due to leading-edge shock of the rotor. In misaligned mode, the stator has higher damping of both pressure and temperature. The stator significantly improves the circumferential uniformity of both velocity and pressure, particularly when operating in aligned mode. The total pressure loss in aligned mode is less, therefore the turbine achieves higher rim work and efficiency. The viscosity is one of the main sources of loss in the flow field. The reflected shock waves at the leading edge of the rotor and in the stator cascade are the primary factors contributing to the leading-edge vortices on the stator vanes.</div></div>","PeriodicalId":23062,"journal":{"name":"Thermal Science and Engineering Progress","volume":"56 ","pages":"Article 103040"},"PeriodicalIF":5.1,"publicationDate":"2024-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142654348","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Performance analysis of a novel dual exhaust mixed refrigerant heat pump with large temperature lift 新型大升温双排气混合制冷剂热泵的性能分析

IF 5.1 3区工程技术

Thermal Science and Engineering Progress Pub Date : 2024-11-06 DOI: 10.1016/j.tsep.2024.103034

Qixiong Tang , Huirong Wang , Hao Guo

{"title":"Performance analysis of a novel dual exhaust mixed refrigerant heat pump with large temperature lift","authors":"Qixiong Tang , Huirong Wang , Hao Guo","doi":"10.1016/j.tsep.2024.103034","DOIUrl":"10.1016/j.tsep.2024.103034","url":null,"abstract":"<div><div>The substantial demand for heat energy, ranging from 70 − 100°C in industrial and commercial sectors, presents a significant challenge when utilizing traditional air source heat pumps. The conventional single-stage air source heat pumps often struggle with low system efficiency and poor operating conditions when tasked with heating with large temperature lift. To address these issues, a novel dual exhaust mixed refrigerant heat pump cycle was proposed. By incorporating an intermediate pressure compression stage in parallel, the proposed system can achieve an optimal temperature match in the recuperator, and lead to a significant enhancement in the coefficient of performance (COP). Compared to a single stage mixed refrigerant heat pump cycle, the novel system improves the COP from 5.063 to 5.756, representing an increase of 13.68 %. Concurrently, the exergy loss proportion of the recuperator decreases from 18.8 % to 13.7 %. The proposed system consistently demonstrates superior COP and exergy efficiency, regardless of whether the ambient temperature is within the range of 0 °C to 20 °C or the outlet water temperatures between 80 °C to 100 °C are present. These findings provide theoretical guidance for enhancing the performance of high-temperature heat pumps with large temperature lift.</div></div>","PeriodicalId":23062,"journal":{"name":"Thermal Science and Engineering Progress","volume":"56 ","pages":"Article 103034"},"PeriodicalIF":5.1,"publicationDate":"2024-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142654352","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A study of pump-driven heat pipe loop and heat pump loop under the same heat transfer environment based on entransy theory 基于熵理论的泵驱动热管环路和热泵环路在相同传热环境下的研究

IF 5.1 3区工程技术

Thermal Science and Engineering Progress Pub Date : 2024-11-05 DOI: 10.1016/j.tsep.2024.103038

Tiantian Cui, Guoyuan Ma, Lei Wang

{"title":"A study of pump-driven heat pipe loop and heat pump loop under the same heat transfer environment based on entransy theory","authors":"Tiantian Cui, Guoyuan Ma, Lei Wang","doi":"10.1016/j.tsep.2024.103038","DOIUrl":"10.1016/j.tsep.2024.103038","url":null,"abstract":"<div><div>Both pump-driven heat pipe loops and heat pump loops can operate in heat transfer environments where the temperature of the heat source is higher than that of the heat sink. To investigate the fundamental utilization of input work during heat transfer processes in two distinct loops, this study employed the theory of entransy to conduct an in-depth analysis of the heat transfer processes in pump-driven heat pipe loops and heat pump loops. The research initially explored these loops’ limiting conditions for cyclic heat transfer. Subsequently, the concept of antransy was introduced to elucidate the substantial role of input work in the heat transfer processes. By the antransy, this paper further analyzed the practical utilization degree of input work, providing theoretical insights for optimizing heat transfer systems. The results indicate that the form of loops and the heat transfer conditions influence the magnitude of input work. Precisely, the input work in the loops compensates for the entransy loss that occurs when the working fluid exchanges heat with the environment. More input work does not necessarily translate into more substantial heat transfer. Furthermore, the utilization degree of input work in different loops depends on factors such as the heat transfer environment, the amount of heat transferred, and the heat capacity of the working fluid. The concept of antransy effectively assesses the efficient utilization of input work in these loops. By analyzing the antransy generated in the system, we can better understand how efficiently the input work is utilized in the heat transfer process. The research findings have enriched the field of entransy theory, providing new insights and perspectives into this area of study. Moreover, the results can promote and offer fresh ideas for optimizing cyclic heat transfer systems.</div></div>","PeriodicalId":23062,"journal":{"name":"Thermal Science and Engineering Progress","volume":"56 ","pages":"Article 103038"},"PeriodicalIF":5.1,"publicationDate":"2024-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142654324","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0