EngRN: Heat Transfer (Topic)最新文献_第2页

Evaporative Cooling With Novel Devices: A Review 新型蒸发冷却装置的研究进展

EngRN: Heat Transfer (Topic) Pub Date : 2017-12-21 DOI: 10.2139/ssrn.3102076

M. Naved, A. Andhare

引用次数: 0

Experimental Study of Condensation Heat Transfer in Helical Coil Heat Exchanger 螺旋盘管换热器冷凝换热实验研究

EngRN: Heat Transfer (Topic) Pub Date : 2017-12-21 DOI: 10.2139/ssrn.3101300

R. Ali, N. Gulhane

引用次数: 0

Modelling and Investigation of Optimum Flow Rate of a Photovoltaic Thermal System (PVT) Integrated with Phase Change Materials (PCM) 相变材料集成光伏热系统(PVT)最优流量建模与研究

EngRN: Heat Transfer (Topic) Pub Date : 1900-01-01 DOI: 10.2139/ssrn.3877907

C. Kandilli, B. Mertoglu

{"title":"Modelling and Investigation of Optimum Flow Rate of a Photovoltaic Thermal System (PVT) Integrated with Phase Change Materials (PCM)","authors":"C. Kandilli, B. Mertoglu","doi":"10.2139/ssrn.3877907","DOIUrl":"https://doi.org/10.2139/ssrn.3877907","url":null,"abstract":"Photovoltaic thermal (PVT) systems are defined as solar cogeneration systems have been developed since the 1970s, and it is noteworthy in energy supply in terms of both electrical and thermal energy with a single panel. With the removal of the heat load on photovoltaic (PV) systems, it is prevented from the fall of the electrical efficiency, while the thermal energy is to be provided. In the PVT system, the phase change materials (PCMs) are used to continue to provide thermal energy after the sun set the thermal energy emerging thermal energy. In the present study, a PCM based PVT system was established and tested under real meteorological conditions. Paraffin was chosen as PCM. The experimental results of ambient, inlet and outlet temperatures and solar radiation were presented. Temperature distribution of the system tested was analyzed. The system was modeled by ANSYS FLUENT. The model was approved by the real data. Optimum flow rate was investigated for the system. Maximum outlet temperature was achieved at 19 l/h flow rate. It was concluded that flow rates of 15-21 l/h could be used in studies as the ideal flow rate for PVT-PCM system with paraffin.","PeriodicalId":424061,"journal":{"name":"EngRN: Heat Transfer (Topic)","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131996479","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

Research on Economic Length of the Horizontal Section of U-Shaped Geothermal Wells Based on Net Present Value 基于净现值的u型地热井水平段经济长度研究

EngRN: Heat Transfer (Topic) Pub Date : 1900-01-01 DOI: 10.2139/ssrn.3878664

D. Xiao, Jiaxin Xu, Li Li, Jianhong Liu, Yifan Hu, Ruitao Yang

{"title":"Research on Economic Length of the Horizontal Section of U-Shaped Geothermal Wells Based on Net Present Value","authors":"D. Xiao, Jiaxin Xu, Li Li, Jianhong Liu, Yifan Hu, Ruitao Yang","doi":"10.2139/ssrn.3878664","DOIUrl":"https://doi.org/10.2139/ssrn.3878664","url":null,"abstract":"Vigorously developing non-fossil energy, including geothermal energy, will lead to carbon neutrality in the future. Based on the technological advantages of oil and gas companies, increasing investment in geothermal energy is a long-term strategy for oil and gas companies and the key to the transformation of such companies into integrated energy companies. The development and use of geothermal resources more effectively and economically require careful analysis and research. A U-shaped geothermal well is formed by joining a vertical well and a horizontal well. Based on the relevant theories of fluid mechanics, thermodynamics, heat transfer, and drilling engineering, this work establishes a mathematical model of U-shaped geothermal wells for heat extraction and uses experimental test data to verify the model. Through coupling technology and economy, this work develops an economic length model for the horizontal section of a U-shaped geothermal well based on the net present value method under multi-parameter combinations. This study provides a set of technical and economic evaluation methods for the optimization of economical and efficient heat extraction in a U-shaped geothermal well. It is of great significance to the realization of the Chinese national energy goal of carbon neutrality.","PeriodicalId":424061,"journal":{"name":"EngRN: Heat Transfer (Topic)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123294993","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

Development and Validation of a Dynamic Flowsheet Model for a 350 MWe Supercritical Circulating Fluidized Bed Boiler 350mwe超临界循环流化床锅炉动态流程模型的建立与验证

EngRN: Heat Transfer (Topic) Pub Date : 1900-01-01 DOI: 10.2139/ssrn.3933569

Shahong Zhu, Man Zhang, Boyu Deng, Zhong Huang, Yi Ding, Gang Wang, Hairui Yang, G. Yue

{"title":"Development and Validation of a Dynamic Flowsheet Model for a 350 MWe Supercritical Circulating Fluidized Bed Boiler","authors":"Shahong Zhu, Man Zhang, Boyu Deng, Zhong Huang, Yi Ding, Gang Wang, Hairui Yang, G. Yue","doi":"10.2139/ssrn.3933569","DOIUrl":"https://doi.org/10.2139/ssrn.3933569","url":null,"abstract":"The circulating fluidized bed (CFB) boiler is highly recommended in peak shaving for its wide load regulating range compared with the pulverized coal (PC) boiler. However, the research on dynamic flowsheet model of the CFB boiler is quite limited due to its complex flow regime. In this paper, both steady state and d ynamic flowsheet model of a supercritical 350 MWe CFB boiler was developed based on Aspen Plus and Aspen Dynamics software coupled with comprehensively user defined combustion kinetics and heat transfer coefficient with FORTRAN subroutines. This model was then validated by the operating data of the 350 MWe supercritical CFB boiler. Based on this model, the dynamic characteristics of three typical step signal disturbances, coal flow rate, primary flow rate and secondary air flow rate, were further analyzed to provide theoretical references to dynamic operation. Also, the quantitative relation between the stabilization time and step signal amplitude was calculated. Above all, this dynamic flowsheet model can not only be used to conduct dynamic behavior prediction and analysis but also provide transfer functions to the further development of CFB automatic control system.","PeriodicalId":424061,"journal":{"name":"EngRN: Heat Transfer (Topic)","volume":"123 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122577011","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

Microconvection of MHD Solarized Nanofluid in the Presence of Double Slip and Surface Suction 双滑移和表面吸力作用下MHD固化纳米流体的微对流

EngRN: Heat Transfer (Topic) Pub Date : 1900-01-01 DOI: 10.2139/ssrn.3900937

Naseer Muhammad Khan, K. M. Abualnaja

{"title":"Microconvection of MHD Solarized Nanofluid in the Presence of Double Slip and Surface Suction","authors":"Naseer Muhammad Khan, K. M. Abualnaja","doi":"10.2139/ssrn.3900937","DOIUrl":"https://doi.org/10.2139/ssrn.3900937","url":null,"abstract":"In recent years, some researchers have analyzed nanofluids and tried to identify potential active ingredients that give nanofluids enormous thermal conductivity (nanoparticle suspensions). In such suspensions, the Brownian motion of the nanoparticles is the only technique expected to enhance the thermal conductivity of the nanofluids, and the sections that can contribute to this are the subject of rules and discussion. When studying the flow, the influence of Brownian motion through the implantation of nanoparticles into the base fluid was investigated and came to the conclusion that Brownian motion of nanoparticles is the only means associated with the enormously improved thermal conductivity of nanofluids. Suction is the only viable way to control cooling rate in multiple product formation processes. The quality and mechanical properties of the final product can be improved by controlling the cooling rate during the melting of raw material and the subsequent condensation process. Slip conditions of the first and second order are also included in the current development. An interesting feature of this model is that the Brownian motion of nanoparticles can be accelerated by solar energy, thereby increasing the temperature of the base fluid. These interesting features increase the demand for this model in many industrial applications.","PeriodicalId":424061,"journal":{"name":"EngRN: Heat Transfer (Topic)","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122234835","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

A Self-Adaptive Integration of Photothermal and Radiative Sky Cooling for Continuously Efficient Harvesting of Energy From the Sun and Outer Space 光热和辐射天空冷却的自适应集成，用于持续有效地收集来自太阳和外太空的能量

EngRN: Heat Transfer (Topic) Pub Date : 1900-01-01 DOI: 10.2139/ssrn.3933998

Xianze Ao, Bowen Li, Bin Zhao, Mingke Hu, H. Ren, Honglun Yang, Jie Liu, Jingyu Cao, Junsheng Feng, Yuanjun Yang, Z. Qi, Liangbin Li, C. Zou, G. Pei

{"title":"A Self-Adaptive Integration of Photothermal and Radiative Sky Cooling for Continuously Efficient Harvesting of Energy From the Sun and Outer Space","authors":"Xianze Ao, Bowen Li, Bin Zhao, Mingke Hu, H. Ren, Honglun Yang, Jie Liu, Jingyu Cao, Junsheng Feng, Yuanjun Yang, Z. Qi, Liangbin Li, C. Zou, G. Pei","doi":"10.2139/ssrn.3933998","DOIUrl":"https://doi.org/10.2139/ssrn.3933998","url":null,"abstract":"The sun (~6000 K) and outer space (~3 K) are two significant renewable thermodynamic resources for human beings on Earth. The solar thermal conversion by photothermal (PT) and harvesting the coldness of outer space by radiative sky cooling (RSC) have already attracted tremendous interest. However, most of the approaches for PT and RSC are static and mono-functional, which can only provide heating or cooling under sunlight or darkness. Here, we develop a spectrally self-adaptive absorber/emitter (SSA/E) with strong solar absorption and switchable emissivity within the atmospheric window (i.e., 8-13μm) for the dynamic combination of PT and RSC, corresponding to continuously efficient energy harvesting from the sun and universe. The as-fabricated SSA/E not only can be heated to ~170°C above ambient temperature under sunshine and but also be cooled to 20°C below ambient temperature, and thermal modeling captures the high energy harvesting efficiency of the SSA/E, enabling new technological capabilities.","PeriodicalId":424061,"journal":{"name":"EngRN: Heat Transfer (Topic)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114136523","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