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.
{"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}
Pub Date : 2024-11-08DOI: 10.1016/j.tsep.2024.103043
Md Naim Hossain , Koushik Ghosh
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 m3, increasing the heat flux from 36 to 50 kW/m2 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/m2. 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.
{"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}
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.
{"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}
Pub Date : 2024-11-06DOI: 10.1016/j.tsep.2024.103034
Qixiong Tang , Huirong Wang , Hao Guo
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.
{"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}
Pub Date : 2024-11-05DOI: 10.1016/j.tsep.2024.103038
Tiantian Cui, Guoyuan Ma, Lei Wang
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.
{"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}
Pub Date : 2024-11-05DOI: 10.1016/j.tsep.2024.103039
Mohamed A. Dahab , Ali A. El-shafei , Gamal B. Abdelaziz , Swellam W. Sharshir
Addressing the water shortage and environmental concerns, this study suggests several modifications to the hemispheric solar still aiming to increase productivity while maintaining a competitive water price. The distiller is enhanced with an ultrasonic atomizer to improve water evaporation throughout the day. The study investigates the impacts of both the water height above the atomizers and their quantity. The system performance was investigated under three cases of modified design, Case 1; integration with atomizers, Case 2; combined atomizers with on–off timer, Case 3; augmented carbon black nanoparticles with atomizers and timer. Results indicated that with four atomizers and 1 cm water height above them, the productivity reached 3.966 L/m2, with exergetic and energetic efficiencies of 1.87 % and 23.22 %, respectively. Additionally, an on–off timer is incorporated into the unit to test performance under different on–off durations (15 min, 20 min, and 25 min). With a 20-minute interval, these values escalated to production rate, energy, and exergy efficiency. 6.393 L/m2, 38.75 %, and 2.95 %, respectively. Furthermore, carbon black nanoparticle implementation is integrated into the distiller alongside intermittent atomizer operation. This integration further boosts productivity to 7.321 L/m2, significantly improving exergy (3.81 %) and energy efficiencies (44.22 %). Compared to a non-modified hemispheric distiller, the modified distillers show productivity enhancement ratios of 40.5 %, 104.1 %, and 137.1 % for the three cases, respectively. From an economic perspective, the water price is substantially lower for the modified distillers, ranging from 0.0128 to 0.0205 USD/L, compared to 0.0229 USD/L for the traditional distiller.
{"title":"Augmentation of hemispherical solar distiller performance utilizing ultrasound atomizers and carbon black nanoparticles","authors":"Mohamed A. Dahab , Ali A. El-shafei , Gamal B. Abdelaziz , Swellam W. Sharshir","doi":"10.1016/j.tsep.2024.103039","DOIUrl":"10.1016/j.tsep.2024.103039","url":null,"abstract":"<div><div>Addressing the water shortage and environmental concerns, this study suggests several modifications to the hemispheric solar still aiming to increase productivity while maintaining a competitive water price. The distiller is enhanced with an ultrasonic atomizer to improve water evaporation throughout the day. The study investigates the impacts of both the water height above the atomizers and their quantity. The system performance was investigated under three cases of modified design, Case 1; integration with atomizers, Case 2; combined atomizers with on–off timer, Case 3; augmented carbon black nanoparticles with atomizers and timer. Results indicated that with four atomizers and 1 cm water height above them, the productivity reached 3.966 L/m<sup>2</sup>, with exergetic and energetic efficiencies of 1.87 % and 23.22 %, respectively. Additionally, an on–off timer is incorporated into the unit to test performance under different on–off durations (15 min, 20 min, and 25 min). With a 20-minute interval, these values escalated to production rate, energy, and exergy efficiency. 6.393 L/m<sup>2</sup>, 38.75 %, and 2.95 %, respectively. Furthermore, carbon black nanoparticle implementation is integrated into the distiller alongside intermittent atomizer operation. This integration further boosts productivity to 7.321 L/m<sup>2</sup>, significantly improving exergy (3.81 %) and energy efficiencies (44.22 %). Compared to a non-modified hemispheric distiller, the modified distillers show productivity enhancement ratios of 40.5 %, 104.1 %, and 137.1 % for the three cases, respectively. From an economic perspective, the water price is substantially lower for the modified distillers, ranging from 0.0128 to 0.0205 USD/L, compared to 0.0229 USD/L for the traditional distiller.</div></div>","PeriodicalId":23062,"journal":{"name":"Thermal Science and Engineering Progress","volume":"56 ","pages":"Article 103039"},"PeriodicalIF":5.1,"publicationDate":"2024-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142654284","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}
This study evaluates the feasibility of producing methanol without carbon emissions Using a comprehensive 4E (energy, exergy, economic, and environmental) approach. Our study focuses on a single methanol production system, analyzing its efficiency, sustainability, and potential as a clean fuel production method so that focusing on capturing carbon dioxide from combined cycle power generation and using the generated power to produce hydrogen through ion exchange electrolysis. The systems were simulated using Aspen Plus software, considering practical constraints to align with the capacity of existing power plants. The analysis revealed that the studied methanol production systems can produce 65.3 MW of power, with a net production power of 65.2 MW available for sale to the national grid. The annual methanol production, based on 8,000 operational hours, is 46,086 tons. The cost of methanol production is estimated at $556.69 per ton, and the environmental impact rate was calculated at 0.3726 units, with an exergy efficiency of 31.63 %. The study demonstrates that methanol can be produced efficiently using carbon capture from combined cycles, significantly reducing carbon dioxide emissions. The results suggest that while the system involves high-cost equipment, it effectively balances power generation and methanol production with a relatively low environmental impact. Future research could focus on advanced exergy analysis to identify and mitigate sources of exergy destruction, as well as optimizing carbon capture configurations and integrating solar thermal energy to enhance system sustainability further.
{"title":"Feasibility assessment of Low-Carbon methanol production through 4E analysis of combined cycle power generation and carbon capture Integration","authors":"Ali Alian Fard , Farzin Hosseinifard , Mohsen Salimi , Majid Amidpour","doi":"10.1016/j.tsep.2024.103037","DOIUrl":"10.1016/j.tsep.2024.103037","url":null,"abstract":"<div><div>This study evaluates the feasibility of producing methanol without carbon emissions Using a comprehensive 4E (energy, exergy, economic, and environmental) approach. Our study focuses on a single methanol production system, analyzing its efficiency, sustainability, and potential as a clean fuel production method so that focusing on capturing carbon dioxide from combined cycle power generation and using the generated power to produce hydrogen through ion exchange electrolysis. The systems were simulated using Aspen Plus software, considering practical constraints to align with the capacity of existing power plants. The analysis revealed that the studied methanol production systems can produce 65.3 MW of power, with a net production power of 65.2 MW available for sale to the national grid. The annual methanol production, based on 8,000 operational hours, is 46,086 tons. The cost of methanol production is estimated at $556.69 per ton, and the environmental impact rate was calculated at 0.3726 units, with an exergy efficiency of 31.63 %. The study demonstrates that methanol can be produced efficiently using carbon capture from combined cycles, significantly reducing carbon dioxide emissions. The results suggest that while the system involves high-cost equipment, it effectively balances power generation and methanol production with a relatively low environmental impact. Future research could focus on advanced exergy analysis to identify and mitigate sources of exergy destruction, as well as optimizing carbon capture configurations and integrating solar thermal energy to enhance system sustainability further.</div></div>","PeriodicalId":23062,"journal":{"name":"Thermal Science and Engineering Progress","volume":"56 ","pages":"Article 103037"},"PeriodicalIF":5.1,"publicationDate":"2024-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142654349","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}
Pub Date : 2024-11-04DOI: 10.1016/j.tsep.2024.103033
Jiqin Yao, Yanhua Ding
Traditional diagnostic methods often rely on the doctor’s experience, which can lead to missed diagnosis or misdiagnosis. With the development of wireless network medical technology, it provides a new possibility for the diagnosis of pelvic floor ultrasound. The purpose of this study was to evaluate the diagnostic value of 4D pelvic floor ultrasound based on wireless network medical technology in puerperal mild to moderate pelvic organ prolapse, and to explore its feasibility in clinical application. In this study, puerperal women were selected for 4D pelvic floor ultrasound examination after delivery, and image data was transmitted in real time to remote experts for analysis combined with wireless network technology. The sensitivity, specificity and application effect of the technique were evaluated by comparing the ultrasound results with the clinical diagnosis results. The results show that compared with traditional methods, wireless network medical technology can significantly improve the efficiency of image transmission and diagnosis accuracy. Therefore, 4D pelvic floor ultrasound based on wireless network medical technology can effectively diagnose the postpartum mild and moderate pelvic organ prolapse of first-time partrients, which has high clinical application value, not only improves the diagnostic efficiency, but also provides a new development direction for telemedicine, and is worthy of promotion and application in clinical practice.
{"title":"Diagnostic value of 4D pelvic floor ultrasound for postpartum mild to moderate pelvic organ prolapse in primiparas based on medical thermal imaging monitoring","authors":"Jiqin Yao, Yanhua Ding","doi":"10.1016/j.tsep.2024.103033","DOIUrl":"10.1016/j.tsep.2024.103033","url":null,"abstract":"<div><div>Traditional diagnostic methods often rely on the doctor’s experience, which can lead to missed diagnosis or misdiagnosis. With the development of wireless network medical technology, it provides a new possibility for the diagnosis of pelvic floor ultrasound. The purpose of this study was to evaluate the diagnostic value of 4D pelvic floor ultrasound based on wireless network medical technology in puerperal mild to moderate pelvic organ prolapse, and to explore its feasibility in clinical application. In this study, puerperal women were selected for 4D pelvic floor ultrasound examination after delivery, and image data was transmitted in real time to remote experts for analysis combined with wireless network technology. The sensitivity, specificity and application effect of the technique were evaluated by comparing the ultrasound results with the clinical diagnosis results. The results show that compared with traditional methods, wireless network medical technology can significantly improve the efficiency of image transmission and diagnosis accuracy. Therefore, 4D pelvic floor ultrasound based on wireless network medical technology can effectively diagnose the postpartum mild and moderate pelvic organ prolapse of first-time partrients, which has high clinical application value, not only improves the diagnostic efficiency, but also provides a new development direction for telemedicine, and is worthy of promotion and application in clinical practice.</div></div>","PeriodicalId":23062,"journal":{"name":"Thermal Science and Engineering Progress","volume":"56 ","pages":"Article 103033"},"PeriodicalIF":5.1,"publicationDate":"2024-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142593179","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}
Pub Date : 2024-11-04DOI: 10.1016/j.tsep.2024.103035
Shekher Sheelam , Chandramohan V.P.
Installation of corrugations on the absorber plate of a solar air heater (SAH) improves its performance. Pentagonal ribs were used as artificial corrugations on the SAH absorber, which is used in an indirect solar dryer. The impact of Reynolds number, Re (4000–22000), corrugation pitch, P (25–200 mm), corrugation height, e (4–20 mm), and corrugation angle, α on the performance of SAH was analyzed by estimating the Nusselt number (Nu), friction factor (f), Nu ratio, f ratio, and thermo-fluidic enhancement index (Etf). Seventeen models were generated in ANSYS DesignModeler. 133 simulations were performed to obtain the optimum pitch (set-1 and 3 simulations) and the optimum height (set-2 simulations) values. Environmental analysis of the SAH was performed by computing the energy payback period (Epb), and CO2 mitigation for a lifetime of 20 years. The Nu increased and the f fell with a rise in Re value. Compared to smooth SAH, the pentagonal ribbed SAH produced a 60–149 % increase in Nu. The highest Etf of 1.839 was obtained at P = 25 mm, e = 7 mm. The proposed optimal dimensions of the pentagonal rib are; e = 7 mm (e/D = 0.05), P = 25 mm (P/e = 3.57), and corrugation angle, α = 18.64°. The Epb and CO2 mitigation are 0.174 years and 57.34 tons, respectively. A comparison of the results with the literature data showed that the present results are acceptable.
{"title":"Influence of pitch and height of pentagonal ribbed absorber plate of solar air heater for performance enhancement with environmental analysis","authors":"Shekher Sheelam , Chandramohan V.P.","doi":"10.1016/j.tsep.2024.103035","DOIUrl":"10.1016/j.tsep.2024.103035","url":null,"abstract":"<div><div>Installation of corrugations on the absorber plate of a solar air heater (SAH) improves its performance. Pentagonal ribs were used as artificial corrugations on the SAH absorber, which is used in an indirect solar dryer. The impact of Reynolds number, <em>Re</em> (4000–22000), corrugation pitch, <em>P</em> (25–200 mm), corrugation height, <em>e</em> (4–20 mm), and corrugation angle, <em>α</em> on the performance of SAH was analyzed by estimating the Nusselt number (<em>Nu</em>), friction factor (<em>f</em>), <em>Nu</em> ratio, <em>f</em> ratio, and thermo-fluidic enhancement index (<em>E<sub>tf</sub></em>). Seventeen models were generated in ANSYS DesignModeler. 133 simulations were performed to obtain the optimum pitch (set-1 and 3 simulations) and the optimum height (set-2 simulations) values. Environmental analysis of the SAH was performed by computing the energy payback period (<em>E<sub>pb</sub></em>), and CO<sub>2</sub> mitigation for a lifetime of 20 years. The <em>Nu</em> increased and the <em>f</em> fell with a rise in <em>Re</em> value. Compared to smooth SAH, the pentagonal ribbed SAH produced a 60–149 % increase in <em>Nu</em>. The highest <em>E<sub>tf</sub></em> of 1.839 was obtained at <em>P</em> = 25 mm, <em>e</em> = 7 mm. The proposed optimal dimensions of the pentagonal rib are; <em>e</em> = 7 mm (<em>e</em>/<em>D</em> = 0.05), <em>P</em> = 25 mm (<em>P</em>/<em>e</em> = 3.57), and corrugation angle, <em>α</em> = 18.64°. The <em>E<sub>pb</sub></em> and CO<sub>2</sub> mitigation are 0.174 years and 57.34 tons, respectively. A comparison of the results with the literature data showed that the present results are acceptable.</div></div>","PeriodicalId":23062,"journal":{"name":"Thermal Science and Engineering Progress","volume":"56 ","pages":"Article 103035"},"PeriodicalIF":5.1,"publicationDate":"2024-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142593177","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}
Pub Date : 2024-11-03DOI: 10.1016/j.tsep.2024.103032
Ying Jiang , Xiaofang Du , Junhong Chen , Mengya Liu , Fan Wang , Bing Wang
The aim of this study was to identify inflammatory and apoptotic genes associated with infectious chronic sinusitis and to analyze their functional networks in medical biological systems by thermal modeling. Bioinformatics analysis was used to identify genes involved in apoptosis and inflammation and construct their functional networks. Finally, thermal modeling techniques were used to explore the dynamic changes of these genes in the pathogenesis of chronic sinusitis. In a comparative analysis, thermal modeling analysis revealed that these genes play important roles in apoptosis, immune response, and inflammatory signaling pathways. In addition, the heat model also revealed the interaction network between different genes, providing a new perspective for understanding the coordination mechanism of inflammation and apoptosis. Through the identification of genes associated with infectious chronic sinusitis and thermal modeling analysis of their functional networks, this study revealed the complex interaction between apoptosis and inflammation in the disease process.
{"title":"Identification and functional network analysis of inflammatory and apoptosis-related genes associated with infectious chronic rhinosinusitis: Thermal modeling of medical biological systems","authors":"Ying Jiang , Xiaofang Du , Junhong Chen , Mengya Liu , Fan Wang , Bing Wang","doi":"10.1016/j.tsep.2024.103032","DOIUrl":"10.1016/j.tsep.2024.103032","url":null,"abstract":"<div><div>The aim of this study was to identify inflammatory and apoptotic genes associated with infectious chronic sinusitis and to analyze their functional networks in medical biological systems by thermal modeling. Bioinformatics analysis was used to identify genes involved in apoptosis and inflammation and construct their functional networks. Finally, thermal modeling techniques were used to explore the dynamic changes of these genes in the pathogenesis of chronic sinusitis. In a comparative analysis, thermal modeling analysis revealed that these genes play important roles in apoptosis, immune response, and inflammatory signaling pathways. In addition, the heat model also revealed the interaction network between different genes, providing a new perspective for understanding the coordination mechanism of inflammation and apoptosis. Through the identification of genes associated with infectious chronic sinusitis and thermal modeling analysis of their functional networks, this study revealed the complex interaction between apoptosis and inflammation in the disease process.</div></div>","PeriodicalId":23062,"journal":{"name":"Thermal Science and Engineering Progress","volume":"56 ","pages":"Article 103032"},"PeriodicalIF":5.1,"publicationDate":"2024-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142592582","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}
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