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1. Effects of tube shapes on the performance of recuperative and regenerative heat exchangers

Author:
Tran, Ngoctan; Wang, Chi-Chuan
Source:
Energy 2019 v.169 pp. 1-17
ISSN:
0360-5442
Subject:
heat transfer,   etc   ; heat exchangers; prediction;     Show all 3 Subjects
Abstract:
... In the present work, the effects of tube shapes on the heat transfer and fluid flow characteristics of the shell-and-tube heat exchangers –including square, rectangular, circular, elliptical, equilateral- and isosceles-triangular shapes –are numerically investigated in detail. Six parameters –including (1) rectangular-tube ratios (⍺ = tube height/width), (2) triangular-tube ratios (β = two-side ed ...
DOI:
10.1016/j.energy.2018.11.127

2. Definition of cycle based comprehensive efficiency of a cooled turbine

Author:
Ba, Wei; Wang, Xiao-chen; Li, Xue-song; Ren, Xiao-dong; Gu, Chun-wei
Source:
Energy 2019 v.168 pp. 601-608
ISSN:
0360-5442
Subject:
heat transfer,   etc   ; air; energy; mixing;     Show all 4 Subjects
Abstract:
... As known that the cooling technology is commonly used in the turbine to protect the turbine blade. The mixing and heat transfer between the high pressure cooling air from the compressor and the turbine main flow would cause energy loss, and it will influence the gas turbine cycle performance. However, the existing definitions of the cooled turbine efficiency always take no account of the work whic ...
DOI:
10.1016/j.energy.2018.11.137

3. Comparative study on combustion and thermodynamics performance of gasoline direct injection (GDI) engine under cold start and warm-up NEDC

Author:
Liu, Qi; Liu, Jingping; Fu, Jianqin; Li, Yangyang; Luo, Baojun; Zhan, Zhangsong; Deng, Banglin
Source:
Energy conversion and management 2019 v.181 pp. 663-673
ISSN:
0196-8904
Subject:
heat transfer,   etc   ; cold; combustion; gasoline; temperature;     Show all 5 Subjects
Abstract:
... In this study, the chassis dynamometer tests for a gasoline-powered passenger vehicle were carried out under cold start and warm-up NEDC. The operating states, combustion and performance parameters of engine were measured continuously during vehicle driving cycles. Then, the combustion and thermodynamics processes under cold start and warm-up NEDC were compared and the influence factors for their ...
DOI:
10.1016/j.enconman.2018.12.043

4. A novel ultra-thin flattened heat pipe with biporous spiral woven mesh wick for cooling electronic devices

Author:
Zhou, Wenjie; Li, Yong; Chen, Zhaoshu; Deng, Liqiang; Gan, Yunhua
Source:
Energy conversion and management 2019 v.180 pp. 769-783
ISSN:
0196-8904
Subject:
heat transfer,   etc   ; cameras; copper; electronic equipment; permeability;     Show all 5 Subjects
Abstract:
... In this work, a novel biporous spiral woven mesh wick is developed to enhance the thermal performance of an ultra-thin flattened heat pipe for cooling high heat flux electronic devices. The biporous wick with different sized pores is hybrid woven using 0.05 and 0.04 mm diameter copper wires in every strand. Three different structures are designed to study the effect of the characteristic parameter ...
DOI:
10.1016/j.enconman.2018.11.031

5. Continuous power output criteria and optimum operation strategies of an upgraded thermally regenerative electrochemical cycles system

Author:
Guo, Juncheng; Wang, Yuan; Gonzalez-Ayala, Julian; Roco, J.M.M.; Medina, A.; Calvo Hernández, A.
Source:
Energy conversion and management 2019 v.180 pp. 654-664
ISSN:
0196-8904
Subject:
heat transfer,   etc   ; electrochemistry; models; thermal energy;     Show all 4 Subjects
Abstract:
... In order to utilize the low-grade thermal energy efficiently, a more realistic model of thermally regenerative electrochemical cycles system with continuous power output is proposed in which the heat transfer irreversibility, external heat leakage and non-ideal regeneration losses are taken into account. Besides, the symmetry of cells, which is necessary for a practical thermally regenerative elec ...
DOI:
10.1016/j.enconman.2018.11.024

6. A 3D-CFD study of a γ-type Stirling engine

Author:
Kuban, Lukasz; Stempka, Jakub; Tyliszczak, Artur
Source:
Energy 2019 v.169 pp. 142-159
ISSN:
0360-5442
Subject:
heat transfer; heat transfer coefficient,   etc   ; friction; hydrodynamics; kinetic energy; models; temperature; transient flow; turbulent flow;     Show all 9 Subjects
Abstract:
... The goal of this work is to perform detailed 3D CFD analysis of heat transfer and flow dynamics inside a commercial gamma-type Stirling engine, including its structural details and variability of the working spaces. The study focuses on an impact of different initial engine parameters, i.e., filling pressures, rotational speeds and heater temperatures, on the engine's characteristics. One of the b ...
DOI:
10.1016/j.energy.2018.12.009

7. Thermodynamic, dynamic and flow friction analysis of a Stirling engine with Scotch yoke piston driving mechanism

Author:
Karabulut, Halit; Okur, Melih; Halis, Serdar; Altin, Murat
Source:
Energy 2019 v.168 pp. 169-181
ISSN:
0360-5442
Subject:
heat transfer; heat transfer coefficient,   etc   ; cold; equations; friction; pistons; temperature; torque; working conditions;     Show all 9 Subjects
Abstract:
... This study concerns with the thermodynamic and dynamic analysis of an alpha type Stirling engine with Scotch-yoke piston driving mechanism. The thermodynamic aspect of the analysis is treated with a polytrophic nodal approximation. The pressure of nodal volumes is calculated with modified Schmidt formula which takes into account the pressure differences between nodal volumes caused by flow frictio ...
DOI:
10.1016/j.energy.2018.11.078

8. Effect of employing a new biological nanofluid containing functionalized graphene nanoplatelets on thermal and hydraulic characteristics of a spiral heat exchanger

Author:
Bahiraei, Mehdi; Kiani Salmi, Hamid; Safaei, Mohammad Reza
Source:
Energy conversion and management 2019 v.180 pp. 72-82
ISSN:
0196-8904
Subject:
heat transfer; heat transfer coefficient,   etc   ; Reynolds number; cold; graphene; heat exchangers; nanocomposites; nanofluids; nanoparticles; viscosity; water;     Show all 11 Subjects
Abstract:
... In this study, thermal and hydraulic attributes of an ecofriendly graphene nanofluid flowing within a countercurrent spiral heat exchanger are evaluated. The cold water flows in one side while the hot nanofluid or hot base fluid moves in the other side of heat exchanger. The heat transfer rate and overall heat transfer coefficient enhance with increasing either Reynolds number or concentration. Th ...
DOI:
10.1016/j.enconman.2018.10.098

9. Numerical evaluation of a compact generator design for steam driven H2O/LiBr absorption chiller application

Author:
Lee, Seung Yeob; Lee, Su Kyoung; Chung, Jin Taek; Kang, Yong Tae
Source:
Energy 2018 v.152 pp. 512-520
ISSN:
0360-5442
Subject:
heat transfer,   etc   ; absorption; steam;     Show all 3 Subjects
Abstract:
... The objectives of this study are to analyze effects of design parameters of a generator with a steam heat source on condensation heat transfer and flow characteristics inside tubes and to design optimum configuration of the generator with minimum volume that satisfies design constraints for H2O/LiBr absorption chiller application. To that end, the heat transfer and flow characteristics of a straig ...
DOI:
10.1016/j.energy.2018.03.161

10. Numerical investigation of heat transfer enhancement in a solar air heater roughened by multiple V-shaped ribs

Author:
Jin, Dongxu; Quan, Shenglin; Zuo, Jianguo; Xu, Shiming
Source:
Renewable energy 2019 v.134 pp. 78-88
ISSN:
0960-1481
Subject:
heat transfer,   etc   ; renewable energy sources; ribs; solar heaters;     Show all 4 Subjects
Abstract:
... The heat transfer and flow characteristics of a multiple V-shaped rib roughened solar air heater were numerically investigated. Calculations were performed for different geometrical parameters of the channel and rib, focused on their detailed effects on the maximum heat transfer enhancement. The multiple V-shaped ribs greatly enhanced the heat transfer, and the maximum thermohydraulic performance ...
DOI:
10.1016/j.renene.2018.11.016

11. Comparative study of liquefied natural gas (LNG) cold energy power generation systems in series and parallel

Author:
Bao, Junjiang; Yuan, Tong; Zhang, Lei; Zhang, Ning; Zhang, Xiaopeng; He, Gaohong
Source:
Energy conversion and management 2019 v.184 pp. 107-126
ISSN:
0196-8904
Subject:
heat transfer,   etc   ; cold; energy; liquefied natural gas; power generation; volatilization;     Show all 6 Subjects
Abstract:
... The irreversible loss of heat transfer between working fluid and LNG in the condensation process of the single-stage cycle which uses liquefied natural gas (LNG) cold energy to generate power is large, resulting in low power generation capacity. This can be improved effectively by combining separated cycles in series or in parallel. But which combination method (in series or in parallel) is more s ...
DOI:
10.1016/j.enconman.2019.01.040

12. Energy saving performance assessment and lessons learned from the operation of an active phase change materials system in a multi-storey building in Melbourne

Author:
Alam, Morshed; Zou, Patrick X.W.; Sanjayan, Jay; Ramakrishnan, Sayanthan
Source:
Applied energy 2019 v.238 pp. 1582-1595
ISSN:
0306-2619
Subject:
heat transfer,   etc   ; buildings; energy; energy conservation; phase transition; summer; temperature;     Show all 7 Subjects
Abstract:
... While the energy saving performance of an active phase change materials (PCMs) system in buildings has been widely investigated using prototype-scale experiments and numerical assessments, their performance during the operational phase of a real building has been less understood. This study assessed the energy-saving performance of an active PCM system installed in an eleven storey building in Mel ...
DOI:
10.1016/j.apenergy.2019.01.116

13. Flame retardant vinylon/poly(m-phenylene isophthalamide) blended fibers with synergistic flame retardancy for advanced fireproof textiles

Author:
Zhang, Xiansheng; Shi, Meiwu
Source:
Journal of hazardous materials 2019 v.365 pp. 9-15
ISSN:
0304-3894
Subject:
heat transfer,   etc   ; fabrics; flame retardants; gases; pyrolysis; risk; synergism;     Show all 7 Subjects
Abstract:
... Superior flame retardant textiles are urgently needed to address high fire and heat risks. This study provides a simple and effective strategy to improve the flame retardancy of textiles through a synergistic effect between the blended fibers, and a system with synergistic in flame retardant vinylon (FRV)/poly(m-phenylene isophthalamide) (PMIA) blended fibers is discovered. The FRV/PMIA 50/50 exhi ...
DOI:
10.1016/j.jhazmat.2018.10.091

14. Effects of arrangement geometry and number of boreholes on thermal interaction coefficient of multi-borehole heat exchangers

Author:
Gultekin, Ahmet; Aydin, Murat; Sisman, Altug
Source:
Applied energy 2019 v.237 pp. 163-170
ISSN:
0306-2619
Subject:
heat transfer,   etc   ; energy efficiency; geometry; heat exchangers; heat pumps;     Show all 5 Subjects
Abstract:
... In large-scale ground-source heat pump applications, a large number of borehole heat exchangers are used and performance losses become an important issue due to thermal interactions. Dependency of total performance losses on borehole spacing can analytically be expressed by using thermal interaction coefficient. For a given application field, interaction coefficient depends on number of boreholes ...
DOI:
10.1016/j.apenergy.2019.01.027

15. Strategies to improve the thermal performance of heat pipe solar collectors in solar systems: A review

Author:
Shafieian, Abdellah; Khiadani, Mehdi; Nosrati, Ataollah
Source:
Energy conversion and management 2019 v.183 pp. 307-331
ISSN:
0196-8904
Subject:
heat transfer,   etc   ; collectors; solar collectors; solar energy; solar farms; surveys;     Show all 6 Subjects
Abstract:
... Invention of evacuated tube heat pipe solar collectors (HPSCs) was a huge step forward towards resolving the challenges of conventional solar systems due to their unique features and advantages. This has led to their utilization in a wide range of solar applications surpassing other conventional collectors. However, relatively low thermal efficiency of heat pipe solar (HPS) systems is still the ma ...
DOI:
10.1016/j.enconman.2018.12.115

16. Experimental analysis of heat transfer and airflow in a closed refrigerated display cabinet

Author:
Chaomuang, Nattawut; Flick, Denis; Denis, Alain; Laguerre, Onrawee
Source:
Journal of food engineering 2019 v.244 pp. 101-114
ISSN:
0260-8774
Subject:
heat transfer,   etc   ; air; air flow; refrigerators; temperature; thermocouples;     Show all 6 Subjects
Abstract:
... This study presents the experimental investigations on heat transfer and airflow in a closed refrigerated display cabinet. Air and product temperatures and air velocity were measured with thermocouples and a hot-wire anemometer, respectively. Temperature variation in the cabinet depends on the positions. The front areas contributed to higher temperature, whereas the rear areas were at a lower temp ...
DOI:
10.1016/j.jfoodeng.2018.09.009

17. CFD simulation and optimization of industrial boiler

Author:
Echi, Souhir; Bouabidi, Abdallah; Driss, Zied; Abid, Mohamed Salah
Source:
Energy 2019 v.169 pp. 105-114
ISSN:
0360-5442
Subject:
heat transfer,   etc   ; combustion; fluid mechanics; mathematical models; sulfuric acid; temperature;     Show all 6 Subjects
Abstract:
... This paper aimed to develop a computational fluid dynamics simulation for an industrial boiler. The industrial boiler is used for the sulfuric acid production. A numerical model is carried out using the commercial code “ANSYS-FLUENT”. The simulations are developed for the case of the industrial boiler and a new proposed design. A clear understanding of the combustion phenomenon and the fluid flow ...
DOI:
10.1016/j.energy.2018.12.006

18. Thermal management of Li-ion battery pack with the application of flexible form-stable composite phase change materials

Author:
Huang, Yi-Huan; Cheng, Wen-Long; Zhao, Rui
Source:
Energy conversion and management 2019 v.182 pp. 9-20
ISSN:
0196-8904
Subject:
heat transfer,   etc   ; ambient temperature; lithium batteries; phase transition;     Show all 4 Subjects
Abstract:
... A method for thermal management of Li-ion battery pack with the application of various flexible form-stable composite phase change materials (CPCMs) is proposed, and investigated both numerically and experimentally. Flexible CPCMs embedded in battery pack lower the thermal contact resistance, thereby improving the thermal control performance. Experimental results show that with the application of ...
DOI:
10.1016/j.enconman.2018.12.064

19. Design optimization and sensitivity analysis of the radiation mini-channel metal hydride reactor

Author:
Wang, Di; Wang, Yuqi; Huang, Zhuonan; Yang, Fusheng; Wu, Zhen; Zheng, Lan; Wu, Le; Zhang, Zaoxiao
Source:
Energy 2019
ISSN:
0360-5442
Subject:
heat transfer,   etc   ; hydrides; hydrogen; hydrogenation; mass transfer; models; temperature;     Show all 7 Subjects
Abstract:
... The hydrogenation process usually accompanies with strong thermal effect, which may lead to the poor hydriding performance if the reaction heat cannot be removed promptly. The design and optimization of metal hydride reactor can significantly advance heat & mass transfer and H2 storage efficiency. A novel radiation mini-channel reactor (RMCR) was proposed to improve the thermal efficiency, and a r ...
DOI:
10.1016/j.energy.2019.02.033

20. An inverse modeling approach for the thermal response modeling of green façades

Author:
Šuklje, Tomaž; Hamdy, Mohamed; Arkar, Ciril; Hensen, Jan L.M.; Medved, Sašo
Source:
Applied energy 2019 v.235 pp. 1447-1456
ISSN:
0306-2619
Subject:
heat transfer,   etc   ; energy efficiency; models; temperature; urban areas; vegetation;     Show all 6 Subjects
Abstract:
... Green façades or vertical greenery systems (VGSs) are continuously gaining attention among urbanists for improving the living comfort and energy efficiency in urban areas. However, modeling and simulating the thermal response of VGSs remains a research topic. This paper introduces a novel inverse modeling approach for modeling the thermal responseof VGSs on building envelopes. The modeling approac ...
DOI:
10.1016/j.apenergy.2018.11.066