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1. Thermal circuits assembling and state-space extraction for modelling heat transfer in buildings

Author:
Ghiaus, Christian; Ahmad, Naveed
Source:
Energy 2020 v.195 pp. 117019
ISSN:
0360-5442
Subject:
heat transfer,   etc   ; buildings; models;     Show all 3 Subjects
Abstract:
... State-space representation is essential in dynamical systems theory. This paper introduces a methodology for obtaining state-space representation from the thermal models of elementary components of a building by the conjunction of two methods: 1) assembling of thermal circuits and 2) state-space extraction from thermal circuit. These methods are fully illustrated on a very simple model and tested ...
DOI:
10.1016/j.energy.2020.117019

2. An experimental study on energy and exergy performance of a spiral tube receiver for solar parabolic dish concentrator

Author:
Thirunavukkarasu, V.; Cheralathan, M.
Source:
Energy 2020 v.192 pp. 116635
ISSN:
0360-5442
Subject:
heat transfer,   etc   ; exergy; temperature;     Show all 3 Subjects
Abstract:
... In this paper, energy and exergy performance of an external type spiral tube receiver for a solar parabolic dish concentrator is experimentally analyzed and presented. Performance evaluation is done at three different radiation conditions. The receiver is tested in the temperature range of 30 °C–100 °C with water as heat transfer fluid and at a flow rate of 1.5 L per minute. The overall heat loss ...
DOI:
10.1016/j.energy.2019.116635

3. Boiling Heat Transfer with a Well-Ordered Microporous Architecture

Author:
Pham, Quang N.; Zhang, Shiwei; Hao, Shuai; Montazeri, Kimia; Lin, Cheng-Hui; Lee, Jonggyu; Mohraz, Ali; Won, Yoonjin
Source:
ACS applied materials & interfaces 2020 v.12 no.16 pp. 19174-19183
ISSN:
1944-8252
Subject:
heat transfer; heat transfer coefficient,   etc   ; boiling; hydrodynamics; permeability; porous media;     Show all 6 Subjects
Abstract:
... Boiling heat transfer through a porous medium offers an attractive combination of enormous liquid–vapor interfacial area and high bubble nucleation site density. In this work, we characterize the boiling performances of porous media by employing the well-ordered and highly interconnected architecture of inverse opals (IOs). The boiling characterization identifies hydrodynamic mechanisms through wh ...
DOI:
10.1021/acsami.0c01113

4. Experimental assessment of damping and heat transfer coefficients in an active free piston Stirling engine using genetic algorithm

Author:
Masoumi, A.P.; Tavakolpour-Saleh, A.R.
Source:
Energy 2020 v.195 pp. 117064
ISSN:
0360-5442
Subject:
heat transfer; heat transfer coefficient,   etc   ; algorithms; data quality; mathematical models;     Show all 5 Subjects
Abstract:
... In this work, two critical parameters of an active free piston Stirling engine (AFPSE) namely, the heat transfer and damping coefficients are practically estimated using genetic algorithm (GA). Although, the mentioned parameters play a significant role in the accuracy of data obtained from the mathematical models, they cannot be measured directly. Indeed, there are no specific sensors to measure d ...
DOI:
10.1016/j.energy.2020.117064

5. Gas pulsation effect on flow behaviors and heat transfer in a tapered fluidized bed

Author:
Zhang, Kai; Wang, Shuai; Tang, Yuxiang; Liu, Guodong; He, Yurong
Source:
Powder technology 2020 v.361 pp. 540-547
ISSN:
0032-5910
Subject:
heat transfer; heat transfer coefficient,   etc   ; fluidized beds; hydrodynamics; models;     Show all 5 Subjects
Abstract:
... A three-dimensional simulation is performed to study the bed to wall heat transfer characteristics in a tapered fluidized bed with pulsed flow by means of the dense discrete phase model (DDPM). A unique core-annulus flow behavior is revealed in a tapered fluidized bed. The heat transfer behaviors are found to be closely associated with the gas-solid hydrodynamics. The impacts of taper angle and he ...
DOI:
10.1016/j.powtec.2019.11.079

6. Experimental and numerical analysis of heat transfer within cavity working under highly non-stationary flow conditions

Author:
Rulik, Sebastian; Wróblewski, Włodzimierz; Majkut, Mirosław; Strozik, Michał; Rusin, Krzysztof
Source:
Energy 2020 v.190 pp. 116303
ISSN:
0360-5442
Subject:
heat transfer; heat transfer coefficient,   etc   ; equipment; mathematical models; sounds;     Show all 5 Subjects
Abstract:
... Cavities and gaps are a common design element of a lot of types of machinery and equipment. The fluid flow over a cavity may generate acoustic waves, which may have both negative and positive implications. This paper is focused on the possibility of improving the heat transfer conditions using the phenomenon of the acoustic wave generation. The operating conditions of a system including an acousti ...
DOI:
10.1016/j.energy.2019.116303

7. Effect of thermal condition of solid wall on the stabilization of a preheated and holder-stabilized laminar premixed flame

Author:
Wan, Jianlong; Zhao, Haibo
Source:
Energy 2020 v.200 pp. 117548
ISSN:
0360-5442
Subject:
heat transfer,   etc   ; combustion; synergism; temperature;     Show all 4 Subjects
Abstract:
... A novel combustor with a flame holder and preheating channels was developed to investigate the synergistic effect of heat and flow recirculation on combustion characteristics. This paper mainly focuses on the thermal condition of flame holder and combustion chamber wall (CCW) and their interaction on flame stabilization. Based on the distribution characteristics of temperature and flow fields, it ...
DOI:
10.1016/j.energy.2020.117548

8. Experimental study of jet fire radiation and a new approach for optimizing the weighted multi-point source model by inverse methods

Author:
Quezada, L.A.; Pagot, P.R.; França, F.H.R.; Pereira, F.M.
Source:
Fire safety journal 2020 v.113 pp. 102972
ISSN:
0379-7112
Subject:
heat transfer,   etc   ; fires; models; prediction;     Show all 4 Subjects
Abstract:
... The present study brings new experimental data on radiation from subsonic jet fires and proposes a new method for employing the inverse analysis technique to optimize the weighting coefficients of the multi-point model. First, detailed measurements of radiative heat flux distributions are obtained for different flame powers, injector diameters and sensor distances. All results fall onto a single c ...
DOI:
10.1016/j.firesaf.2020.102972

9. A time-saving method to evaluate the thermal insulation performance of cryogenic vessels

Author:
Zhang, J.F.; Wei, G.M.; Qu, Z.G.
Source:
Journal of cleaner production 2020 v.258 pp. 120632
ISSN:
0959-6526
Subject:
heat transfer,   etc   ; insulating materials; mass flow;     Show all 3 Subjects
Abstract:
... Equivalent mass loss is a critical index used to evaluate the thermal insulation performance of cryogenic vessels. The current test standards for measuring the thermal insulation performance of cryogenic vessels in different countries require a long testing time and waste a considerable amount of working medium. In this study, a method that can shorten the test time of the thermal insulation perfo ...
DOI:
10.1016/j.jclepro.2020.120632

10. Ras Tanura Refinery desalination plant case study towards operational excellence

Author:
Abu Al-Saud, Hassan; Griman, Jose
Source:
Water resources and industry 2020 v.23 pp. 100124
ISSN:
2212-3717
Subject:
heat transfer,   etc   ; case studies; desalination; nozzles; seawater;     Show all 5 Subjects
Abstract:
... Ras Tanura Refinery desalination plants production has been historically limited for a number of factors. Major obstacles for low performance were heat transfer, plugging of spray nozzles, operating under severe scaling process, brine and distilled water level control, seawater velocity, chemical dosing, and poor strainers performance.Major challenges for the low performance in desalination plants ...
DOI:
10.1016/j.wri.2020.100124

11. Effect of conjugate heat exchange of flame holder on laminar premixed flame stabilization in a meso-scale diverging combustor

Author:
Wan, Jianlong; Zhao, Haibo
Source:
Energy 2020 v.198 pp. 117294
ISSN:
0360-5442
Subject:
heat transfer,   etc   ; mathematical models; quantitative analysis;     Show all 3 Subjects
Abstract:
... The present work investigates the effect of heat exchange of flame holder on the premixed flame stabilization in a diverging channel through numerical simulation. When the heat exchange of flame holder exists, the flame can remain stable and presents a “V” shape. A majority of the heat flux that enters the flame holder is used to preheat the incoming fresh mixture, which can induce and enhance the ...
DOI:
10.1016/j.energy.2020.117294

12. MHD flow and heat transfer near stagnation point over a stretching/shrinking surface with partial slip and viscous dissipation: Hybrid nanofluid versus nanofluid

Author:
Aly, Emad H.; Pop, I.
Source:
Powder technology 2020 v.367 pp. 192-205
ISSN:
0032-5910
Subject:
heat transfer,   etc   ; equations; magnetism; nanofluids; temperature;     Show all 5 Subjects
Abstract:
... The steady magnetohydrodynamic stagnation point flow and heat transfer over a stretching/shrinking surface in a hybrid nanofluid with partial slip and viscous dissipation were theoretically/numerically studied. The governing equations of the problem were turned into ODEs by using appropriate transformations. The plots of most important parameters were presented for both surfaces. It was found that ...
DOI:
10.1016/j.powtec.2020.03.030

13. Flame extinction and burning behaviour of timber under varied oxygen concentrations

Author:
Cuevas, Juan; Torero, Jose Luis; Maluk, Cristian
Source:
Fire safety journal 2020 pp. 103087
ISSN:
0379-7112
Subject:
heat transfer,   etc   ; air; burning; fires; oxygen;     Show all 5 Subjects
Abstract:
... Self-extinction plays a crucial role in enabling the safe use of timber structures in mid- and high-rise construction, where structural integrity during and after a fire is critical. To date, the influence that oxygen concentration may have in the conditions that lead to self-extinction has not been studied in depth. Also, the thermal conditions of timber after self-extinction has occurred have no ...
DOI:
10.1016/j.firesaf.2020.103087

14. Effects of particle type on the particle distribution in a two-pass circulating fluidized bed evaporator with baffle

Author:
Li, Na; Zhang, Yuqing; Jiang, Feng; Wang, Hongyu; Li, Xiulun
Source:
Powder technology 2020 v.366 pp. 1-11
ISSN:
0032-5910
Subject:
heat transfer,   etc   ; fluidized beds; fouling; physical phases;     Show all 4 Subjects
Abstract:
... To enhance heat transfer, as well as prevent and remove fouling, a two-pass circulating fluidized bed evaporator with baffle has been designed and built. The uniformity of particle distribution significantly influences the performance of evaporator. This paper mainly researches the influences of particle types on the particle distribution with a Charge Couple Device image measurement and acquisiti ...
DOI:
10.1016/j.powtec.2020.02.038

15. Numerical study of a heat transfer process in a low power heating boiler equipped with afterburning chamber

Author:
Judt, W.; Ciupek, B.; Urbaniak, R.
Source:
Energy 2020 v.196 pp. 117093
ISSN:
0360-5442
Subject:
heat transfer,   etc   ; combustion; flue gas; fuels; streams;     Show all 5 Subjects
Abstract:
... The paper presents a numerical study of a heat transfer process realized in a three draughts low power heating boiler for solid fuels combustion equipped with an afterburning chamber. The main reason for the proposed research is to define the character of an exhaust gas flow through the special construction of heating device at different levels of the heat loading. Heating boiler construction allo ...
DOI:
10.1016/j.energy.2020.117093

16. Departure Velocity of Rolling Droplet Jumping

Author:
Chu, Fuqiang; Li, Shaokang; Ni, Zhongyuan; Wen, Dongsheng
Source:
Langmuir 2020 v.36 no.14 pp. 3713-3719
ISSN:
1520-5827
Subject:
heat transfer,   etc   ; droplets; engineering; rolling; simulation models;     Show all 5 Subjects
Abstract:
... Droplet jumping phenomenon widely exists in the fields of self-cleaning, antifrosting, and heat transfer enhancement. Numerous studies have been reported on the static droplet jumping while the rolling droplet jumping still remains unnoticed even though it is very common in practice. Here, we used the volume of fluid (VOF) method to simulate the droplet jumping induced by coalescence of a rolling ...
DOI:
10.1021/acs.langmuir.0c00185

17. Joint effects of liquid level and baffle height on the particle distribution and pressure drop in a vertical two-pass circulating fluidized bed evaporator with a baffle

Author:
Li, Na; Zhang, Yuqing; Jiang, Feng; Qi, Guopeng; Wang, Hongyu; Su, Rui; Zhang, Weiwei; Shi, Ning
Source:
Powder technology 2020 v.364 pp. 27-35
ISSN:
0032-5910
Subject:
heat transfer,   etc   ; evaporation; fluidized beds; fouling; liquids;     Show all 5 Subjects
Abstract:
... To enhance heat transfer, as well as prevent and remove fouling, a vertical two-pass circulating fluidized bed evaporator with a baffle has been designed and built. The uniformity of particle distribution in the evaporator significantly influences the performance of fouling preventing and removing. The joint effects of baffle height and liquid level in the evaporation chamber on the particle distr ...
DOI:
10.1016/j.powtec.2020.01.063

18. Hybrid nanofluid flow and heat transfer over backward and forward steps: A review

Author:
Salman, S.; Talib, A.R. Abu; Saadon, S.; Sultan, M.T. Hameed
Source:
Powder technology 2020 v.363 pp. 448-472
ISSN:
0032-5910
Subject:
heat transfer,   etc   ; nanofluids; nanoparticles; thermal conductivity;     Show all 4 Subjects
Abstract:
... This work describes the recent progress in the improvement of heat transfer through microscale facing steps. This analysis includes previous studies that aimed to improve heat transfer with and without hybrid nanofluids. This review presents the experimental and numerical results on the usage of hybrid nanofluids. Furthermore, this work introduces the use of backward-facing step (BFS), forward-fac ...
DOI:
10.1016/j.powtec.2019.12.038

19. The challenge of solar powered combined cycles – Providing dispatchability and increasing efficiency by integrating the open volumetric air receiver technology

Author:
Zaversky, Fritz; Les, Iñigo; Sorbet, Patxi; Sánchez, Marcelino; Valentin, Benoît; Brau, Jean-Florian; Siros, Frédéric
Source:
Energy 2020 v.194 pp. 116796
ISSN:
0360-5442
Subject:
heat transfer,   etc   ; combustion; cooling; solar collectors; temperature;     Show all 5 Subjects
Abstract:
... This work analyzes the performance potential of solar-only powered combined cycles, comparing the impact of two different solar receiver technologies (opaque-heat-exchanger-type vs. volumetric). Due to material and receiver performance constraints, as well as the absence of internal combustion, the gas turbine inlet temperature (TIT) is limited to considerably lower values than observed in current ...
DOI:
10.1016/j.energy.2019.116796

20. Modeling for Temperature Distribution of Water in a Multiwaveguide Microwave Reactor

Author:
Chen, Ru-Jia; Qiao, Ning; Arowo, Moses; Zou, Hai-Kui; Chu, Guang-Wen; Luo, Yong; Sun, Bao-Chang; Chen, Jian-Feng
Source:
Industrial & engineering chemistry process design and development 2020 v.59 no.10 pp. 4762-4774
ISSN:
1520-5045
Subject:
heat transfer,   etc   ; mathematical models; radio waves; temperature;     Show all 4 Subjects
Abstract:
... The work herein employed COMSOL Multiphysics simulation and experiment to study the temperature distribution of water in a specially designed cylindrical microwave (MW) reactor with two magnetrons. A numerical model was developed by combining three modules including radio frequency (RF), fluid heat transfer, and nonisothermal fluid flow. The experimental results of the temperature distribution cor ...
DOI:
10.1021/acs.iecr.9b04748