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Heat Transfer and Fluid Flow in Heat Exchangers and Sustainable Energy Systems

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A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "J1: Heat and Mass Transfer".

Deadline for manuscript submissions: closed (20 June 2023) | Viewed by 9877

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Special Issue Editors

Dr. Nazrul Islam

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Guest Editor

Faculty of Engineering, Department of Mechanical Engineering King Abdulaziz University, Jeddah, Saudi Arabia
Interests: Computational Fluid Dynamics (CFD); Mixed Convection Heat Transfer; Sustainable Energy; Nanofluids

Dr. Dibakar Rakshit

E-Mail Website
Guest Editor

Department of Energy Science and Engineering, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India
Interests: Heat Transfer and Fluid Dynamics; Sustainable Energy; Energy storage devices (system optimization/ characterization of storage materials); Heat Exchanger using PCM; Green building concepts; Transient modelling and simulation of high-temperature systems; Multiphase flow studies; Polygeneration; Waste heat recovery; Battery Thermal Management Systems

Prof. Dr. Saleem Anwar Khan

E-Mail Website
Guest Editor

Department of Mechanical Engineering, ZHCET, Aligarh Muslim University, Aligarh (UP) 202002, India
Interests: Biomimetic Fish Underwater Robots; Heat Mass Transfer and Fluid Flow; Computational Fluid Dynamics; Micro-Fluidics

Dr. Abdullatif A. Gari

E-Mail Website
Guest Editor

Faculty of Engineering, Department of Mechanical Engineering, King Abdulaziz University, Jeddah, Saudi Arabia
Interests: Microchannels Heat Exchangers; Thermal Storage Systems; CFD; Nanofluids and Nanoparticles; Snow Melting Systems

Prof. Dr. Abdus Samad

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Guest Editor

Department of Ocean Engineering, Indian Institute of Technology Madras, Chennai 600036, India
Interests: Renewable energy; Heat Transfer and Fluid Flow; Design Optimization; Computational Fluid Dynamics; Turbomachinery

Dr. Amjad Ali Pasha

E-Mail Website
Guest Editor

Aerospace Engineering Department, King Abdulaziz University, Jeddah 21589, Saudi Arabia
Interests: high-speed combustion flows; micro-convective and nanofluid flow heat transfer in duct flows; airfoil wing design; Space launch vehicle; hyperloop; MILD combustion; IC engine alternative fuels; combustion soot formation; renewable and sustainable energy technologies

Special Issue Information

Dear Colleagues,

The energy sector is faced with three simultaneous challenges: reducing energy consumption, improving the overall efficiency of conversion, and developing clean renewable technologies. Advanced heat transfer and fluid flow are critical for solving these problems and thus play a central role in efforts to establish sustainable energy systems, as well as in emission reduction and pollution abatement. Great strides have been made recently in numerical and experimental methods for the study of heat transfer and fluid flow, and the transition towards these advances has had great significance for the scientific community. Many varied applications of these methods include heat exchangers, building systems, power plants, renewable energy systems, fluid delivery systems, etc. Consequently, all attempts to develop heat exchangers and sustainable energy systems with high efficiency, low emissions, and low cost include heat transfer and/or fluid flow to a large extent. In fact, the heat transfer rate is a deciding factor for temperature control, energy, and material saving in heat exchangers.

The accurate prediction of fluid dynamics and thermal transmission is crucial for developing such efficient systems, and as a result, significant research activity has been devoted to this topic. Moreover, the need for high heat transfer in heat exchangers has prompted the development of several approaches that improved convective heat transfer by lowering the thermal resistance at the heated surface. The methods for heat transfer enhancement are being extensively explored, and studies by the researchers in conjunction with the heat storage systems are required so that excess energy can be stored and then deployed at a desirable time. Thus, achieving efficient, compact, and low-cost heat transfer and fluid flow methods for heat exchangers and sustainable energy systems is a challenge for researchers, which requires a holistic solution. Their development is thus contingent on theoretical, numerical, and experimental work combined with the use of modern techniques.

This Special Issue seeks to showcase a selection of research articles on experimental and numerical heat transfer and fluid flow studies in various thermal and energy systems, and it is intended to provide a forum for presenting various multidisciplinary aspects of such systems.

The topics of interest for this Special Issue include (but are not limited to) the following:

Computational Fluid Dynamics (CFD) in energy systems;
Heat transfer in single phase and multiphase flow;
Techniques of heat transfer enhancement and energy saving;
Analysis of fluid flow and heat transfer in thermal and energy systems;
Active and passive cooling systems;
Complex heat transfer in energy systems;
Design optimization of heat exchangers;
Turbomachinery;
Micro-fluidics and nanofluidic heat transfer;
Thermal storage systems.

Articles on any aspect of the application of numerical, theoretical, or experimental methods to problems in the above-mentioned broad aspects are welcome. Studies which contain new ideas and whose analyses go beyond established theories are especially encouraged.

Dr. Nazrul Islam
Dr. Dibakar Rakshit
Prof. Dr. Saleem Anwar Khan
Dr. Abdullatif A. Gari
Prof. Dr. Abdus Samad
Dr. Amjad Ali Pasha
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Energies is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

computational fluid dynamics (CFD)
numerical simulation
convection
radiation
heat transfer enhancement
active and passive thermal regulation in energy systems
energy system optimization

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Research

26 pages, 5796 KiB

Open AccessArticle

Performance Evaluation of a Solar Heat-Driven Poly-Generation System for Residential Buildings Using Various Arrangements of Heat Recovery Units

by Saeed Alqaed, Ali Fouda, Hassan F. Elattar, Jawed Mustafa, Fahad Awjah Almehmadi, Hassanein A. Refaey and Mathkar A. Alharthi

Energies 2022, 15(22), 8750; https://doi.org/10.3390/en15228750 - 21 Nov 2022

Cited by 8 | Viewed by 1737

Abstract

Poly-generation systems are a feasible alternative to conventional energy production techniques in buildings. A poly-generation system allows for the concurrent production of electricity, heat, cold, and fresh water, with considerable advantages regarding technology, finances, energy recovery, and the environment. In the present study, the organic Rankine cycle (ORC), the humidification–dehumidification desalination system (HDH), and the desiccant cooling system (DCS) are merged with three unique solar-driven poly-generation systems (BS, IS-I, and IS-II) and numerically examined. The proposed options provide energy, space cooling, domestic heating, and potable water to buildings of small/medium scale. Using n-octane ORC working fluid, the impact of operational circumstances on system productivity and execution characteristics was considered. The findings show that (i) the suggested poly-generation systems can provide electrical power, conditioned space cooling, local heating, and fresh water, whereas keeping the conditioned area pleasant, (ii) the IS-I system achieves the best system performance among all compared arrangements (BS and IS-II); (iii) the attained extreme values of

{\dot{W}}_{n e t}

{\dot{m}}_{f r e s h}

{\dot{Q}}_{c o o l i n g}

{\dot{Q}}_{h e a t i n g}

, and TGOR are 102.0 kW (all systems), 214.70 kg/h (IS-II), 29.940 kW (IS-II), 225.6 kW (IS-I), and 0.6303 (IS-I), respectively. Full article

(This article belongs to the Special Issue Heat Transfer and Fluid Flow in Heat Exchangers and Sustainable Energy Systems)

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25 pages, 3361 KiB

Open AccessArticle

Energy Performance Assessment of a Novel Solar Poly-Generation System Using Various ORC Working Fluids in Residential Buildings

by Fahad Awjah Almehmadi, H. F. Elattar, A. Fouda, Saeed Alqaed, Jawed Mustafa, Mathkar A. Alharthi and H. A. Refaey

Energies 2022, 15(21), 8286; https://doi.org/10.3390/en15218286 - 6 Nov 2022

Cited by 9 | Viewed by 1648

Abstract

Poly-generation systems are an exciting new technology that provide an alternative to separating existing energy production methods in buildings. A poly-generation system enables the efficient simultaneous production of heating, cooling, fresh water, and electricity, resulting in many technological, economic, energy recovery, and environmental advantages. This study numerically investigates three proposed novel solar-driven poly-generation systems (BS, IS-I, and IS-II) integrated with organic Rankine cycle (ORC), humidification-dehumidification desalination system (HDH), and desiccant cooling system (DCS) with different heat recovery system arrangements. The suggested systems supply residential structures with energy, space conditioning, domestic heating, and fresh water. The effects of system operating circumstances on productivity and performance characteristics and several organic working fluid types (n-octane, R245fa, R113, isopentane, and toluene) on optimum system performance have been investigated. The results show that (i) the average enhancement percentage of TGOR using integrated poly-generation systems over the separated ones is 68.5%, 68.5%, and 95.5% for BS, IS-I, and IS-II systems, respectively; (ii) when comparing the three systems, the IS-I system outperforms the other systems (BS & IS-II); and (iii) the maximum values of W^•_net, m^•_fresh, Q^•_cooling, and Q^•_heating, obtained for different proposed systems using n-octane are 102 kW (all systems), 214.7 kg/h (IS-II), 29.94 kW (IS-II), and 225.6 kW (IS-I); (iv) R113 has the highest TGOR of 0.6924 (IS-I) compared to other organic fluids. (v) The improvements in

W_{n e t}^{•}

m_{f r e s h}^{•}

Q_{c o o l i n g}^{•}

and

Q_{h e a t i n g}^{•}

with using toluene instead of R113 at t_f1 = 40 °C are 177.5%, 105.8%, 389.25%, and 79%, respectively. Full article

(This article belongs to the Special Issue Heat Transfer and Fluid Flow in Heat Exchangers and Sustainable Energy Systems)

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18 pages, 3017 KiB

Open AccessArticle

Comparative Study of Thermodynamic Regulation Characteristics in a Dual-Tube Reactor with an External Heat Exchanger

by Yong Bai, Yunfeng Ma, Changjun Ke, Wang Cheng, Guangyan Guo, Peng Zhao, Can Cao, Lifen Liao, Xuebo Yang and Zhongwei Fan

Energies 2022, 15(18), 6794; https://doi.org/10.3390/en15186794 - 16 Sep 2022

Viewed by 1425

Abstract

A special dual-tube reactor-dual fluidized bed reactor (DFBR), including an external heat exchanger (EHE) and a bypass, was designed to solve the problems that the waste heat of the hot fluid cannot be fully utilized and the reaction temperature cannot be accurately adjusted. Two connection schemes of DFBR and EHE with their thermodynamic equilibrium models and algorithms were proposed, and the optimal scheme was obtained by comparing the outlet temperature and thermal load. The results of the thermodynamic and operating characteristics of the optimal scheme showed that the hot fluid and the cold fluid had positive and negative effects on the heat transfer process, respectively. Increasing the cold fluid mass flow rate in the main stream can enhance the thermal load of the system and increasing the cold fluid mass flow rate in the bypass helped to increase the thermal load of DFBR, even exceeding that of EHE. Adding a bypass can adjust temperature precisely and increasing the inlet temperature can more effectively increase the adjustment range of the reaction zone temperature. The experimental results showed that introducing a bypass can significantly reduce the calculation deviation (12.8%), which decreased with the increasing temperature. Full article

(This article belongs to the Special Issue Heat Transfer and Fluid Flow in Heat Exchangers and Sustainable Energy Systems)

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24 pages, 11359 KiB

Open AccessArticle

Local Heat Transfer Dynamics in the In-Line Tube Bundle under Asymmetrical Pulsating Flow

by Aigul Haibullina, Aidar Khairullin, Denis Balzamov, Vladimir Ilyin, Veronika Bronskaya and Liliya Khairullina

Energies 2022, 15(15), 5571; https://doi.org/10.3390/en15155571 - 31 Jul 2022

Cited by 8 | Viewed by 1780

Abstract

The pulsating flow is one of the techniques that can enhance heat transfer, therefore leading to energy saving in tubular heat exchangers. This paper investigated the heat transfer and flow characteristics in a two-dimensional in-line tube bundle with the pulsating flow by a numerical method using the Ansys Fluent. Numerical simulation was performed for the Reynolds number Re = 500 with different frequencies and amplitude of pulsation. Heat transfer enhancement was estimated from the central tube of the tube bundle. Pulsation velocity had an asymmetrical character with a reciprocating flow. The technique developed by the authors to obtain asymmetric pulsations was used. This technique allows simulating an asymmetric flow in heat exchangers equipped with a pulsation generation system. Increase in both the amplitude and the frequency of the pulsations had a significant effect on the heat transfer enhancement. Heat transfer enhancement is mainly observed in the front and back of the cylinder. At a steady flow in these areas, heat transfer is minimal due to the weak circulation of the flow. The increase in heat transfer in the front and back of the cylinder is associated with increased velocity and additional flow mixing in these areas. The maximum increase in the Nusselt number averaged over space and time in the entire studied range was 106%, at a pulsation frequency of 0.5 Hz and pulsation amplitude of 4.5. A minimum enhancement of 25% was observed at a frequency of 0.166 Hz and amplitude of 1.25. Full article

(This article belongs to the Special Issue Heat Transfer and Fluid Flow in Heat Exchangers and Sustainable Energy Systems)

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13 pages, 4254 KiB

Open AccessArticle

Energy Consumption Analysis for Coupling Air Conditioners and Cold Storage Showcase Equipment in a Convenience Store

by Kusnandar, Indra Permana, Weiming Chiang, Fujen Wang and Changyu Liou

Energies 2022, 15(13), 4857; https://doi.org/10.3390/en15134857 - 2 Jul 2022

Cited by 4 | Viewed by 2082

Abstract

The energy use intensity (EUI) of convenience stores was substantially higher than that of office buildings and hotels, due to a compact footprint but a high density of equipment yielded a higher EUI. As a result, it is critical to assess and maintain the state of the convenience store in order to obtain a lower EUI and reduce energy consumption. This study utilizes a convenience store to evaluate energy consumption and perform a CFD simulation to see how the environment influences by cold storage showcase (CSS) equipment. On the basis of field testing and on-site web-based monitoring data, a survey of baseline information through data collecting and energy benchmarking data has been provided and extensively examined. According to energy monitoring, the convenience store’s highest electricity use is 23,055 kWh in June, and the lowest power consumption is 15,216 kWh in February. The CFD simulation results revealed that the temperature near the CSS can be 3–5 °C lower than in other regions. The temperature nearby return air will be lower as a result of the low-temperature air impacts from CSS. The AC sensor detects that the environment has met the indoor requirements and performs the load reduction operation. After adjusting the AC temperature, it is discovered that the unit is unable to attain the appropriate temperature. Energy consumption can be reduced, resulting in more energy-efficient AC and CSS operations. Furthermore, the CSS’s cold air effect might be taken advantage of by raising the AC-2 temperature set point to generate energy savings. Full article

(This article belongs to the Special Issue Heat Transfer and Fluid Flow in Heat Exchangers and Sustainable Energy Systems)

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