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Effect of injection strategy on a diesel/methanol dual-fuel direct-injection engine Appl. Therm. Eng. (IF 4.725) Pub Date : 2021-02-09 Zhiyong Li; Yang Wang; Zibin Yin; Heming Geng; Rui Zhu; Xudong Zhen
Methanol direct-injection achieves direct injection of diesel and methanol in the cylinder by using two independent fuel injection systems. This yields an extremely high methanol substitution rate and extremely low pollutant emissions. Due to these advantages, three injection strategies are proposed to investigate this injection method: D/M mode and M/D mode are where methanol injection occurs later
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Investigation and optimization on cooling performance of a novel double helix structure for cylindrical lithium-ion batteries Appl. Therm. Eng. (IF 4.725) Pub Date : 2021-02-18 Fei Dong; Ziyang Cheng; Jianwei Zhu; Decai Song; Jie Ni
Liquid cooling system was critical to keep the performance of lithium-ion battery due to its good conductivity to keep battery working in a cool environment. In this study, a novel double helix cooling structure was designed for an 18650 lithium battery. The numerical simulation was carried out to investigate the effects of the coolant mass flow rate (M), helix groove pitch (P) and flow diameter (D)
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Effect of spray modes on electrospray cooling heat transfer of ethanol Appl. Therm. Eng. (IF 4.725) Pub Date : 2021-02-20 Haojie Xu; Junfeng Wang; Bin Li; Kai Yu; Jiameng Tian; Dongbao Wang; Wei Zhang
Spray cooling is a promising approach to efficient removal of heat and has attracted increasing interest with its excellent characteristics, such as strong heat exchange capacity, low flow rate, and uniform temperature distribution. Recently, high voltages have been successfully employed in electrospray (ES) cooling, which has improved cooling performance but has poor heat transfer control. We experimentally
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Dynamic heat transfer analysis of a direct-expansion CO2 downhole heat exchanger Appl. Therm. Eng. (IF 4.725) Pub Date : 2021-02-20 Yang Li; Wenjie Xu; Ling Ma; Jun Zhao; Wenjia Li; Shihe Wang; Jiulong Liu
Compared with conventional second-loop ground-coupled heat pump, direct-expansion ground-coupled heat pump can achieve higher energy efficiency. To maximize the heat exchange rate of direct-expansion heat exchanger, a novel direct-expansion downhole heat exchanger is proposed in this study, using supercritical pressure CO2 as the refrigerant. The heat exchanger is placed inside a closed water well
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Advances in free-piston internal combustion engines: A comprehensive review Appl. Therm. Eng. (IF 4.725) Pub Date : 2021-02-06 Chendong Guo; Zhengxing Zuo; Huihua Feng; Tony Roskilly
Free-piston internal combustion engines (FPICEs) have many potential advantages, such as simple structure, high conversion efficiency, multi-fuel feasibility and multi-output power types, because their piston motion is not restricted by the crankshaft system. Therefore, FPICEs have received considerable attention worldwide for many decades. According to recent research, the typical types of FPICEs
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Energy loss analysis of the storage tank coil heating process in a dynamic thermal environment Appl. Therm. Eng. (IF 4.725) Pub Date : 2021-02-18 Wei Sun; Qinglin Cheng; Lixin Zhao; Zhidong Li; Yang Liu
With the increasing demand for crude oil reserves, storage tanks are being developed on a large scale, and heating energy consumption is gradually increasing. Hence, it is necessary to study energy utilization. The variable physical parameters of crude oil and dynamic thermal environment are considered to establish a coil heating theoretical model of a large crude oil storage tank. On this basis, according
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Low temperature performance evaluation of electrochemical energy storage technologies Appl. Therm. Eng. (IF 4.725) Pub Date : 2021-02-20 A. Fly; I. Kirkpatrick; R. Chen
The performance of electrochemical energy storage technologies such as batteries and supercapacitors are strongly affected by operating temperature. At low temperatures (<0 °C), decrease in energy storage capacity and power can have a significant impact on applications such as electric vehicles, unmanned aircraft, spacecraft and stationary power storage. In this work, the discharge behaviour of nine
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Flow structure with mixed turbulent flow of supercritical CO2 heated in helically coiled tube Appl. Therm. Eng. (IF 4.725) Pub Date : 2021-02-08 Xinxin Liu; Xiaoxiao Xu; Youzhou Jiao; Chao He; Liang Liu; Chaobin Dang
The mixed turbulent convection heat-transfer characteristics of supercritical CO2 (S-CO2) heated in both vertical and horizontal oriented helically coiled tube (HC-tube) is investigated via experimental and numerical methods. Firstly, the coupled equations of flow direction, buoyancy force and centrifugal force in HC-tube are established. Then, the influence of the three factors on axial and radial
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Aerodynamic limits of gas turbine compressor during high air offtakes for minimum load extension Appl. Therm. Eng. (IF 4.725) Pub Date : 2021-02-18 Artur Szymanski; Uyioghosa Igie; Kamal Abudu; Richard Hamilton
Renewable energy sources (RES) have become a favoured alternative to fossil fuel energy generation that has been driven by environmental concerns. Their intermittent nature has meant that gas turbines have remained relevant to support them as a backup. Current grid operation requires gas turbines to operate at as low power as possible when their demand drops, and also ramp-up quickly when power generation
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Numerical investigation of a dual-PCM heat sink using low melting point alloy and paraffin Appl. Therm. Eng. (IF 4.725) Pub Date : 2021-02-23 Pingrui Huang; Gaosheng Wei; Liu Cui; Chao Xu; Xiaoze Du
For the purpose of reducing the weight and cost of low melting point alloy (LMPA) heat sink, a novel dual-phase change material (PCM) heat sink by using both LMPA and paraffin was proposed in this paper. A numerical model was developed by considering the conduction and natural convection in paraffin and the pure conduction in LMPA. The semi-implicit pressure-linked equation algorithm was adopted to
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Integration of CO2 power and refrigeration cycles with a desalination unit to recover geothermal heat in an oilfield Appl. Therm. Eng. (IF 4.725) Pub Date : 2021-02-23 Chitta Sahana; Sudipta De; Subha Mondal
Onshore oilfields are considered as geothermal fields producing hot water in the high water cut stage (HWCS). In the present study, a supercritical CO2 power cycle is proposed to recover the heat of the hot water obtained at a temperature close to 140 °C from the oilfield in the HWCS. The output power of the supercritical CO2 power cycle is expensed to run the compressor of an ejector expansion CO2
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Study of paraffin-based composite-phase change materials for a shell and tube energy storage system: A mesh adaptation approach Appl. Therm. Eng. (IF 4.725) Pub Date : 2021-02-26 Ali Veismoradi; Mohammad Ghalambaz; Hassan Shirivand; Ahmad Hajjar; Abdulmajeed Mohamad; Mikhail Sheremet; Ali Chamkha; Obai Younis
Energy storage systems based on phase change materials are very innovative and useful in different engineering applications. The present study deals with numerical simulation of energy transport performance in a shell and tube energy storage system, including the paraffin wax or copper foam insertion with paraffin wax. The mathematical description of the considered problem consists of the basic equations
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Experimental study on temperature difference between the interior and surface of Li[Ni1/3Co1/3Mn1/3]O2 prismatic lithium-ion batteries at natural convection and adiabatic condition Appl. Therm. Eng. (IF 4.725) Pub Date : 2021-02-20 Xiaolong Yang; Xiaolin Gao; Futao Zhang; Wei Luo; Yongkang Duan
The internal temperature of the battery is important for the design of battery thermal management and battery safety; however, it is difficult to be tested and seldom studied. A method of embedding thermocouples inside a prismatic Li[Ni1/3Co1/3Mn1/3]O2 (NCM) lithium-ion battery was developed to study the temperature inconsistency between the battery interior and the surface. Six thermocouples were
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The retrofit of the calcium chloride production by Pinch approach and process modifications Appl. Therm. Eng. (IF 4.725) Pub Date : 2021-02-25 Stanislav Boldyryev; Anatoly A. Shamraev; Elena O. Shamraeva
In this paper, the analysis of an existing calcium chloride evaporation unit was performed to cut primary energy use and harmful emissions. This paper proposes the use of several approaches for retrofit of existing calcium chloride production. The existing process's energy efficiency was examined to identify drawbacks and bottlenecks and provide the pathways for proper process modification. The methodology
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Thermal and mechanical abuse of electric vehicle pouch cell modules Appl. Therm. Eng. (IF 4.725) Pub Date : 2021-01-25 P.A. Christensen; Z. Milojevic; M.S. Wise; M. Ahmeid; P.S. Attidekou; W. Mrozik; N.A. Dickmann; F. Restuccia; S.M. Lambert; P.K. Das
This paper reports thermal (burner) and mechanical (blunt trauma and nail penetration) abuse experiments on electric vehicle lithium ion modules comprising eight 56.3 Ah lithium nickel manganese cobalt (NMC) pouch cells. The aim of project part of which is described in this paper was to study the problem of thermal runaway in lithium ion batteries under different abuse conditions and at different SOC
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Performance of a fluidized bed-fired Stirling engine as micro-scale combined heat and power system on wood pellets Appl. Therm. Eng. (IF 4.725) Pub Date : 2021-02-14 T. Schneider; F. Ruf; D. Müller; J. Karl
Combined heat and power production in micro- to small-scale is one main part of the decentralization of energy production. Concepts using solid biogenic fuels to provide power and heat are manifold, but often focus on a nominal power output above 50 kWel. Moreover, slagging or fouling issues in combustion processes provoke reduced electrical efficiencies and short maintenance intervals. This research
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Performance study of a new hybrid parabolic trough collector system integrated with hybrid tubular thermoelectric generator Appl. Therm. Eng. (IF 4.725) Pub Date : 2021-02-24 A. Habchi; B. Hartiti; H. Labrim; S. Fadili; A. Benyoussef; N. Belouaggadia; A. Faddouli; M. Benaissa; E.Ntsoenzok; H. EZ-Zahraouy
Advanced parabolic trough systems are the promising technologies for the production of usable heat and electrical power. Here we study the effects of hot water temperature adjustment concept and optical concentrator on the thermal and electrical efficiencies of a new PTC/HTTEG configuration, which comprises parabolic trough concentrator and hybrid tubular thermoelectric generator. The hybrid tubular
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Recent developments of thermal energy storage applications in the built environment: A bibliometric analysis and systematic review Appl. Therm. Eng. (IF 4.725) Pub Date : 2021-02-05 Emiliano Borri; Gabriel Zsembinszki; Luisa F. Cabeza
The energy consumption in the built environment represents one of the major contributors of carbon emissions to the atmosphere. This leads to the need for a transition in the building sector and the introduction of policies that pursue high efficiency in residential and non-residential buildings with an increasing share of renewables. The benefit of the use of thermal energy storage is widely recognized
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Response behaviors of CO2 transcritical Rankine cycle based parabolic trough solar power plant to cloud disturbance Appl. Therm. Eng. (IF 4.725) Pub Date : 2021-02-14 Zhenghua Rao; Cunyue Peng; Yaqiong Wang; Yitao Wang; Gang Liu; Shengming Liao
The CO2 transcritical Rankine cycle (CO2-TRC) has a great potential for the application in concentrating solar power (CSP) system due to the advantages of using low- and medium- temperature sources and compact structures. However, the cloud passages always lead to the suddenly varied heat input to the system, while understanding the system’s response to the cloud disturbance may enable the operational
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Thermodynamic analysis of an organic Rankine–vapor compression cycle (ORVC) assisted air compression system for cryogenic air separation units Appl. Therm. Eng. (IF 4.725) Pub Date : 2021-02-18 Xia Zhou; Yangyiming Rong; Song Fang; Kai Wang; Xiaoqin Zhi; Limin Qiu; Xuelin Chi
Air compression is the main energy consumption process in cryogenic air separation units (ASUs), while compression waste heat occupies over 60% of the total compression power. However, the compression waste heat has not yet been recovered in existing ASUs, implying a great potential for energy efficiency improvement. In this paper, an organic Rankine-vapor compression cycle (ORVC) assisted three-stage
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Prediction of the sealing flow effect on the temperature drop characteristics of a pre-swirl system in an aero-engine Appl. Therm. Eng. (IF 4.725) Pub Date : 2021-02-13 Gaowen Liu; Xinxin Wang; Wenbin Gong; Aqiang Lin
The sealing flow will inevitably affect the cooling airflow quality in a second air system of an aero-engine. In this study, theoretical derivation and numerical simulation were conducted to establish a modified mixing model that considers both the torque and the source of the mixing flow. Then, the effect of the sealing flow can be evaluated using the modified mixing model. The results demonstrate
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Heat transfer enhancement and exergy efficiency improvement of a micro combustor with internal spiral fins for thermophotovoltaic systems Appl. Therm. Eng. (IF 4.725) Pub Date : 2021-02-16 Ziqiang He; Yunfei Yan; Ting Zhao; Shuai Feng; Xiuquan Li; Li Zhang; Zhien Zhang
Targeting at addressing the low exergy efficiency of micro thermophotovoltaic (MTPV) system, a novel micro combustor with internal spiral fins is proposed. The geometrical parameters, including internal spiral fin number, length and pitch distance, on the thermal performance and exergy efficiency are numerically investigated. The introduction of internal spiral fins can effectively improve the exergy
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Thermal-hydraulic and fouling performances of enhanced double H-type finned tubes for residual heat recovery Appl. Therm. Eng. (IF 4.725) Pub Date : 2021-02-16 X.L. Li; S.Q. Wang; D.L. Yang; G.H. Tang; Y.C. Wang
Heat exchangers for residual heat recovery in coal-fired power plants face the issues of low heat transfer efficiency of flue gas side and the fly ash fouling. However, heat transfer enhancement structures always increase the fouling on the fin. Efficient methods are required to improve both heat transfer and anti-fouling performance of the heat exchanger. In present study, the thermal-hydraulic and
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Experimental study on the impact of pressure ratio on temperature drop in a Ranque-Hilsch vortex tube Appl. Therm. Eng. (IF 4.725) Pub Date : 2021-02-18 Mark J. Parker; Anthony G. Straatman
An experimental investigation of a Ranque-Hilsch vortex tube has been performed. The investigation focuses on the effects that pressure magnitude, pressure drop and pressure ratio have on the temperature drop between the inlet and the cold outlet. The Ranque-Hilsch vortex tube used in the experiments was designed through consideration of a large body of experimental data consolidated from existing
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Numerical Study of the Flow Uniformity Inside the High-Pressure Side Manifolds of a Cooled Cooling Air Heat Exchanger Appl. Therm. Eng. (IF 4.725) Pub Date : 2021-02-23 Hariharan Kallath; Foster Kwame Kholi; Qingye Jin; Man Yeong Ha; Sang Hu Park; Hyeon-jun Kim; Jason Chetwynd-Chatwin; June Kee Min
To maintain efficiency in advanced aero-engines, it is crucial to set high limits for the Operating Pressure Ratio (OPR) and Turbine Entry temperature (TET). This can be achieved using a Cooled Cooling Air (CCA) heat exchanger, which precools the compressed air with the bypass stream before the compressed air enters the turbine to cool the blades. The aim of the present study was to improve the aero-thermal
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Multi-functional three-phase sorption solar thermal energy storage cycles for cooling, heating, and heat transformer Appl. Therm. Eng. (IF 4.725) Pub Date : 2021-02-23 Abel Mehari; Z.Y. Xu; R.Z. Wang
Thermal energy storage based on sorption method is attractive in view of energy storage density, storage period, and flexibility. Three-phase sorption thermal energy storage is advantageous from high energy storage density, but its temperature lift is low. Besides, further energy storage density enhancement is needed to make the storage system more compact. In this paper, multi-functional three-phase
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An intelligent thermal management system for optimized lithium-ion battery pack Appl. Therm. Eng. (IF 4.725) Pub Date : 2021-02-23 Weichao Zhuang; Zhitao Liu; Hongye Su; Guangwei Chen
Battery thermal management system is one of the most essential parts for the battery pack in electric vehicles. In this paper, a new battery thermal management system is developed through the combination of the battery pack structure optimization and the cooling strategy design. First, a new battery pack equipped with the hollow spoiler prisms based on the aligned battery pack is designed to improve
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Numerical analysis of fluid dynamics and thermodynamics in a stirling engine Appl. Therm. Eng. (IF 4.725) Pub Date : 2021-02-14 Wandong Zhao; Ruijie Li; Hailing Li; Ying Zhang; Songgang Qiu
A 3D modeling of the fluid dynamics and heat transfer in an advanced free-piston Stirling engine was conducted. The transient and conjugate fluid dynamics and thermodynamics of the coupling fluid-solid domain over the working cycle were comprehensively investigated. The comparisons among different turbulent CFD models and Sage result of the engine were performed. Results indicate that the k-epsilon
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Performance of a new tank design with variable outlet port in a thermosiphon solar water heating system Appl. Therm. Eng. (IF 4.725) Pub Date : 2021-02-08 Jiarong Li; Xiangdong Li; Lixing Ding; Yong Wang; Jiyuan Tu
A new tank design with variable outlets at different heights is lately proposed. In this paper, the new tank design is applied to a thermosiphon solar water heating system. The performance of the thermosiphon system is investigated for space heating of an office building. A mathematical model of the thermosiphon system is developed and validated against the experimental data. With the mathematical
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Experimental study of local air-side heat transfer coefficient on real-scale heat exchanger fins by employing an absorption-based mass transfer method Appl. Therm. Eng. (IF 4.725) Pub Date : 2021-02-16 Min Che; Stefan Elbel
Local air-side heat transfer coefficients (HTCs) of real-scale heat exchanger fins have been experimentally investigated in the current study. A recently developed absorption-based mass transfer method has been employed to visualize and obtain two-dimensional HTC distributions on different fins at a high resolution (8.6 µm). The process involves a mass transfer from airflow to a color change thin film
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Coupled electromagnetic-thermal analysis of roadway inductive power transfer pads within a model pavement Appl. Therm. Eng. (IF 4.725) Pub Date : 2021-02-09 Maedeh Amirpour; Seho Kim; Matthew P. Battley; Piaras Kelly; Simon Bickerton; Grant Covic
Inductive Power Transfer (IPT) technology is a promising solution for wireless charging of Electric Vehicles (EVs). Given the expected uptake of IPT technology for both stationary and in motion in-road charging, many technical challenges regarding the electromagnetic field and thermal aspects need to be overcome to generate cost-effective and reliable solutions. One particular design constraint of
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Impact of the expander lubricant oil on the performance of the plate heat exchangers and the scroll expander in a micro-scale organic Rankine cycle system Appl. Therm. Eng. (IF 4.725) Pub Date : 2021-02-15 Ramin Moradi; Mauro Villarini; Emanuele Habib; Enrico Bocci; Andrea Colantoni; Luca Cioccolanti
Organic Rankine Cycles (ORCs) are recognized as suitable systems to convert the thermal energy from low-grade heat sources to electricity. However, their performance and reliability are subjected to several deficiencies especially at micro-to-small scales. In this work, the impact of the expander lubricant oil on the performance of the heat exchangers and the scroll expander of a non-regenerative,
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Heat transfer performance enhancement of liquid cold plate based on mini V-shaped rib for battery thermal management Appl. Therm. Eng. (IF 4.725) Pub Date : 2021-02-16 Wei Jiang; Jiateng Zhao; Zhonghao Rao
Liquid cooling is an effective method for thermal management of high-power battery packs. A number of studies have shown that the general methods to enhance heat transfer performance by increasing flow rate will significantly increase pump power consumption. Here, in order to reduce the pump power consumption while enhancing heat transfer, the mini V-shaped ribs is used to optimize the structure of
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Integrated high temperature heat pumps and thermal storage tanks for combined heating and cooling in the industry Appl. Therm. Eng. (IF 4.725) Pub Date : 2021-02-16 Marcel Ulrich Ahrens; Sverre Stefanussen Foslie; Ole Marius Moen; Michael Bantle; Trygve Magne Eikevik
This study investigates the integrated heat pump system of a green-field dairy located in Bergen, Norway. The purpose of the study is to determine the energy consumption and system performance. The dairy features a novel and innovative solution of a fully integrated energy system, employing high temperature heat pumps such as the hybrid absorption-compression heat pump (HACHP) with natural refrigerants
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Heat transfer and frictional pressure drop characteristics of H2O/LiBr solution in plate heat exchangers for triple-effect absorption application Appl. Therm. Eng. (IF 4.725) Pub Date : 2021-02-16 Joo Young Song; Joon Ho Park; Yong Tae Kang
In this study, single-phase H2O/LiBr solution heat transfer and frictional pressure drop characteristics in plate heat exchangers (PHEs) with two different chevron angles are experimentally evaluated for triple-effect H2O/LiBr absorption chiller applications. The test PHEs are single-pass exchangers with 20 plates. Chevron angles are 78.5° and 55.7° for high- and low-theta PHEs, respectively. Heat
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Numerical investigation of thermal runaway behavior of lithium-ion batteries with different battery materials and heating conditions Appl. Therm. Eng. (IF 4.725) Pub Date : 2021-02-16 Depeng Kong; Gongquan Wang; Ping Ping; Jenifer Wen
The proliferating thermal runaway accidents are still the main obstacle that hinders the extensive applications of lithium-ion batteries. An abuse condition triggering thermal runaway of particular interest is local heating, which is the direct and common cause. However, a comprehensive simulation and analysis of thermal runaway under local heating from the perspective of heat generation, external
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Impact of Gas Turbine Flexibility Improvements on Combined Cycle Gas Turbine Performance Appl. Therm. Eng. (IF 4.725) Pub Date : 2021-02-20 Kamal Abudu; Uyioghosa Igie; Ioannis Roumeliotis; Richard Hamilton
The improvement of gas turbines flexibility has been driven by more use of renewable sources of power due to environmental concerns. There are different approaches to improving gas turbine flexibility, and they have performance implications for the bottoming cycle in the combined cycle gas turbine (CCGT) operation. The CCGT configuration is favourable in generating more power output, due to the higher
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Techno-economic comparison of compound parabolic collector and flat plate collector in solar water heating systems in the northern hemisphere Appl. Therm. Eng. (IF 4.725) Pub Date : 2021-02-20 Hooman Azad Gilani; Siamak Hosseinzadeh
The auxiliary requirement of a solar water heating system is an index of the end-users cost and, thus, the feasibility of the system. Within this study several locations worldwide with high and low solar radiation and electricity prices in latitudes of 0, 15, 30, 45 and 60°N have been selected and the effect of employing a Compound Parabolic Collector (CPC) on the yearly auxiliary energy saving of
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Preliminary experiment and performance evaluation of a terrestrial solar thermoelectric generators under fluctuant solar radiation Appl. Therm. Eng. (IF 4.725) Pub Date : 2021-02-20 Song Lv; Yishuang Ji; Zuoqin Qian; Yaoyu Pan; Yujia Zhang; Wei He
The solar thermoelectric generator (STEG) is a promising alternative terrestrial solar power generation device due to its ability to utilize almost full solar spectrum. Many researches have been carried out to improve its efficiency. Some improved STEG has achieved remarkable efficiency in the laboratory. However, its performance in practical situations has been few studied, which limits its practical
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Hydrophobic in-situ SiO2-TiO2 composite aerogel for heavy oil thermal recovery: synthesis and high temperature performance Appl. Therm. Eng. (IF 4.725) Pub Date : 2021-02-20 Sijia Liu; Xiaodong Wu; Yanhan Li; Sheng Cui; Xiaodong Shen; Gang Tan
In view of the global energy crisis, energy saving in high-temperature thermal production is urgent. The traditional rock wool and composite silicate board cannot meet the requirements of high efficiency thermal insulation for heavy oil recovery pipe due to their poor insulation performance, and the emerging SiO2 aerogel production has poor shielding ability to infrared thermal radiation, resulting
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Assessing the effects of fluids flow on heat transfer performance in direct contact heat transfer process through EMD-LSSVM model: An experimental study Appl. Therm. Eng. (IF 4.725) Pub Date : 2021-02-20 Junwei Huang; Guanfeng Zheng; Meng Li; Qingtai Xiao; Hua Wang
The problem that the exact nonlinear connection between fluids flow and heat transfer in direct contact heat evaporator was studied. The direct contact heat evaporator structure can be optimized and direct contact heat transfer process can be improved with the help of the optimum matching relationship between the complex flow and heat transfer. The methods used are the signal processing technology
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Design and Thermomechanical Analysis of a Cell-Integrated, Tapered Channel Heat Sink Concept for Prismatic Battery Cells Appl. Therm. Eng. (IF 4.725) Pub Date : 2021-02-20 T.D. Nguyen; W. Tsutsui; A. Williams; J. Deng; B. Robert; W. Chen; T. Siegmund
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Wet steam flow and condensation loss in turbine blade cascades Appl. Therm. Eng. (IF 4.725) Pub Date : 2021-02-20 Chuang Wen; Yan Yang; Hongbing Ding; Chunqian Sun; Yuying Yan
This study develops a wet steam modelling to solve the phase change process inside the linear blade cascade of a steam turbine. The comparative study is carried out to understand the impact of the dry gas model and wet steam model on predicting the flow behaviours in a steam turbine. The effect of the cutback of the trailing edge on the flow structure and nonequilibrium condensation is evaluated in
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Enhanced thermal efficiency organic Rankine cycle for renewable power generation Appl. Therm. Eng. (IF 4.725) Pub Date : 2021-02-20 U. Caldiño Herrera; J.C. García; F.Z. Sierra-Espinosa; J.A. Rodríguez; Ó.A. Jaramillo; Ó. De Santiago; S. Tilvaldiev
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Exhaust temperature control for safe and efficient thermal regeneration of diesel particulate filter Appl. Therm. Eng. (IF 4.725) Pub Date : 2021-02-20 Tiexiong Huang; Guangdi Hu; Zhongwei Meng; Dongjian Zeng
It is crucial for the diesel particulate filter (DPF) that the exhaust temperature at the DPF inlet is well managed and accurately controlled during the thermal regeneration process, in order to ensure the integrity of the filter and improve regeneration efficiency simultaneously. However, this is challenging because the DPF and the upstream diesel oxidation catalyst are complex systems with complicated
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Numerical investigation of heat transfer and flow characteristics of a double-wall cooling structure: Reverse circular jet impingement Appl. Therm. Eng. (IF 4.725) Pub Date : 2021-02-16 Abdallah Ahmed; Edward Wright; Fawzy Abdel-Aziz; Yuying Yan
Double-wall cooling structures are commonly used to enhance the heat transfer in combustor liner and aerofoil internal cooling within gas turbine engines and other industrial applications. This is the first study to adopt a novel reverse jet impingement technique into a double-wall cooling structure in order to achieve a higher heat transfer rate with relatively lower pressure drop. This paper uses
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Characterization analysis of dynamic behavior of basic ORC under fluctuating heat source Appl. Therm. Eng. (IF 4.725) Pub Date : 2021-02-09 Xiaoli Yu; Yan Huang; Zhi Li; Rui Huang; Jinwei Chang; Lei Wang
Organic Rankine Cycle (ORC) is widely investigated for low-grade waste heat recovery, but its performance deteriorates under heat source with thermal power fluctuations. As the effects of fluctuating heat source on ORC system performance is less investigated, the operating rules of ORC systems under fluctuating heat source are not clear. In this study, the effects of fluctuating amplitude and period
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Measurement of heat generation rate and heat sources of pouch type Li-ion cells Appl. Therm. Eng. (IF 4.725) Pub Date : 2021-02-11 Yang Hu; Song-Yul Choe; Taylor R. Garrick
Fundamental understanding of heat generation of lithium-ion batteries during operations is crucial to the cost-effective and efficient design of a thermal management system (TMS) in electric vehicles. Accurate characterization of the heat requires a calorimeter that meets inherent dynamics of the heat with accuracy. Therefore, we have developed an isothermal calorimeter using the thermoelectric assemblies
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Design, manufacturing and testing of a compact thermoacoustic refrigerator Appl. Therm. Eng. (IF 4.725) Pub Date : 2021-02-09 Islam A. Ramadan; Hélène Bailliet; Gaëlle Poignand; David Gardner
Thermoacoustic refrigeration technology is a green alternative for the conventional refrigeration system in vehicles. The former uses environmentally friendly inert gases whereas the latter uses chemical refrigerants that can have severe impacts on the environment. In order to apply thermoacoustic technology in the automobile industry, the size and the weight of plausible thermoacoustic refrigerators
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Experimental determination of the optimum intermediate and gas-cooler pressures of a commercial transcritical CO2 refrigeration plant with parallel compression Appl. Therm. Eng. (IF 4.725) Pub Date : 2021-02-05 Laura Nebot-Andrés; Daniel Sánchez; Daniel Calleja-Anta; Ramón Cabello; Rodrigo Llopis
CO2 systems used in refrigeration are becoming more complex with the aim of improving their energy performance. Parallel compression is one of the implemented solutions to enhance the performance of the plants. However, an optimization process is required to operate this system at high performance and its operation is subjected to physical limitations in real plants. This work presents the experimental
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On thermally managing lithium-ion battery cells by air-convection aspirated in tetrahedral lattice porous cold plates Appl. Therm. Eng. (IF 4.725) Pub Date : 2021-02-10 Young Woo Son; Tongbeum Kim; Tian Jian Lu; Se-Myong Chang
The faster charge/discharge of lithium-ion batteries that power unmanned aerial vehicles (or drones) increases heat emission substantially, thus requiring effective thermal management solutions. In this study, we present such a thermal solution for prismatic lithium-ion battery cells managed by “naturally aspirated air-convection” in tetrahedral lattice porous cold plates as a multi-functional application
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Intermittent mode analysis of a borehole ground heat exchanger with novel phase change backfill materials Appl. Therm. Eng. (IF 4.725) Pub Date : 2021-02-13 Wanfang Zhao; Zhongting Hu; Wei He; Sheng Zhang; Hancheng Yu; Gaofei Xu; Hongbing Chen
A study was conducted to investigate heat transfer in a ground heat exchanger (GHE) system with a novel capric acid-lauric acid eutectics/expanded graphite (EG) composite PCM. The composite PCM was prepared and analyzed. The optimal mass ratio of fatty acid to EG was 10:100 with a melting heat of 134.13 kJ/kg. The thermal performances of GHE system with different fraction ratios of the composite PCM
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Performance Evaluation of a Terry GS-2 Steam Impulse Turbine with Air-Water Mixtures Appl. Therm. Eng. (IF 4.725) Pub Date : 2021-02-18 Joshua Vandervort; Gavin Lukasik; Burak Ayyildiz; Matthew Solom; Adolfo Delgado; Karen Vierow Kirkland; Abhay Patil
Terry steam turbines are widely used in various industries because of their robust design. Within the nuclear power generation industry, they are used in the Reactor Core Isolation Cooling System to remove decay heat during reactor isolation events. During the Fukushima Daiichi nuclear power station disaster in Japan in 2011, the Reactor Core Isolation Cooling System and associated Terry turbine operated
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Dynamic modelling of a CO2 transport refrigeration unit with multiple configurations Appl. Therm. Eng. (IF 4.725) Pub Date : 2021-02-18 Francesco Fabris; Paolo Artuso; Sergio Marinetti; Silvia Minetto; Antonio Rossetti
The paper presents the dynamic characterization of a novel CO2 system designed for the refrigerated transport sector, when equipped to a medium-size refrigerated truck, during a daily typical long-distance delivery mission. The system takes advantage of a two-phase ejector to improve its performances and an auxiliary evaporator to extend the ejector operating range towards mild ambient temperatures
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Analysis of a phosphoric acid fuel cell-based multi-energy hub system for heat, power, and hydrogen generation Appl. Therm. Eng. (IF 4.725) Pub Date : 2021-02-17 Chungi Park; Yoonju Jung; Kisung Lim; Bonghyun Kim; Yoonseung Kang; Hyunchul Ju
Natural gas (NG) is delivered to homes and businesses through a complex pipeline network that mainly consists of high-pressure main feed lines and many low-pressure local distribution lines. To date, throttling valves have been employed to reduce the NG pressure between the two types of pipeline, leading to the loss of the work potential generated by the expansion of pressurized NG in the NG supply
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Modelling of fouling in a plate heat exchanger with high temperature pasteurisation process Appl. Therm. Eng. (IF 4.725) Pub Date : 2021-02-06 M. Indumathy; S. Sobana; Rames C. Panda
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Effects of seal installation in the mid-passage gap between turbine blade platforms on film cooling Appl. Therm. Eng. (IF 4.725) Pub Date : 2021-02-08 Sehjin Park; JeongJu Kim; Minho Bang; Hee Koo Moon; Osamu Ueda; Hyung Hee Cho
Hot combustion gas in gas turbines can be ingested into the mid-passage gap between the blade platforms, resulting potentially a catastrophic damage. To prevent the ingress of hot gas, the blade platform underneath cavity is pressurized with purge air. Seals are typically installed in the mid-passage gap to minimize the purge air requirement. Under inadequate back flow margin, ingress of the main flow
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Theoretical model of a Stirling/Pulse tube hybrid refrigerator and its verification Appl. Therm. Eng. (IF 4.725) Pub Date : 2021-01-21 Biqiang Liu; Zhenhua Jiang; Kongkuai Ying; Wang Yin; Haifeng Zhu; Shaoshuai Liu; Nanxi Li; Yinong Wu; Deping Dong
Stirling/pulse tube hybrid refrigerator, a novel refrigerator composed of Stirling refrigerator as the first stage and pulse tube refrigerator as the second stage, has great potential in space detection applications. This kind of hybrid refrigerator exhibits outstanding comprehensive performance in reliability, efficiency and compactness due to its unique structure. However, there is usually a contradiction
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The multivariable inverse artificial neural network combined with GA and PSO to improve the performance of solar parabolic trough collector Appl. Therm. Eng. (IF 4.725) Pub Date : 2021-02-04 Wassila Ajbar; A. Parrales; U. Cruz-Jacobo; R.A. Conde-Gutiérrez; A. Bassam; O.A. Jaramillo; J.A. Hernández
This work focused on presenting a multivariate inverse artificial neural network (ANNim) by developing two functions coupled to metaheuristic algorithms to increase a parabolic trough collector (PTC). This work aims to provide a new method capable of improving the thermal efficiency of a PTC by determining multiple optimal input variables. At first, two ANN models carried out to predict the PTC thermal
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Thermally conductive silicone composites modified by graphene-oxide aerogel beads loaded with phase change materials as efficient heat sinks Appl. Therm. Eng. (IF 4.725) Pub Date : 2021-02-16 Jinliang Zhao; Ying Zhao; Jinliang An; Chengchao Yuan; Yang Zhao; Yong Xiang; Jinglei Yang
Electrically insulating phase change composite materials (PCCMs) with lightweight, good thermal management performance, high stability and high mechanical strength are strongly desired for lithium-ion battery (LIB) thermal management. This research study presents a group of PCCMs based on the integration of reduced graphene-oxide aerogel beads (rGOAB), phase change materials (PCMs) and thermally conductive
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