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Women in Thermal Management

A topical collection in Energies (ISSN 1996-1073). This collection belongs to the section "J: Thermal Management".

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Editors

1. Dipartmento di Ingegneria Industriale e Scienze Matematiche, Università Politecnica delle Marche, Via Brecce Bianche, I-60131 Ancona, Italy;
2. KU Leuven, Department of Mechanical Engineering, B-3000 Leuven, Belgium
Interests: demand side management; heat pumps; energy efficiency; renewable energy; energy transition; energy flexibility
Special Issues, Collections and Topics in MDPI journals
Faculty of Mechatronics and Mechanical Engineering, Kielce University of Technology, Al. Tysiaclecia Panstwa Polskiego 7, 25-314 Kielce, Poland
Interests: heat transfer; minichannels; minigaps; compact heat exchangers; two-phase flow; heat transfer enhancement; temperature measurement; computational methods for solving inverse heat transfer problems; thermal and production engineering; quality management tools
Special Issues, Collections and Topics in MDPI journals
Department of Electron Devices, Budapest University of Technology and Economics, H-1117 Budapest, Hungary
Interests: thermal investigation of ICs and MEMS; thermal sensors; thermal testing; thermal simulation; thermal model generation; electro-thermal simulation; CPS systems
Special Issues, Collections and Topics in MDPI journals

Topical Collection Information

Dear Colleagues,

Topical Collection "Women in Thermal Management" is dedicated to scientists who deal with thermal engineering topics such as energy efficiency, renewable energy, heat transfer processes (especially in small channels, including mathematical modeling and computational methods for solving heat transfer problems), production engineering and management, electro-thermal testing, as well as simulation and model generation using cyber-physical systems. We strongly encourage the submission of papers that focus on these issues and understand the importance of innovation and creative approaches in science.

One essential interest of this issue is energy efficiency regarding heat transfer during fluid flow in channels of small dimensions. The combination of stricter energy performance requirements with the continuing trend towards miniaturization (e.g., for refrigerant charge reduction in heat pumps and chillers) has made thermal management a key issue in engineering research. As a result, increasingly advanced methods are being employed to intensify heat transfer. One of the key aspects is heat transfer with phase change, which is known to increase the efficacy of the process. Various solutions can be applied to support heat transfer during fluid flow, such as changing the geometrical parameters, the use of nanofluids, or the application of enhanced heating surfaces. We invite papers discussing engineering design in this field, in combination with production engineering (e.g., additive manufacturing) and management.

Prof. Dr. Alessia Arteconi
Prof. Dr. Magdalena Piasecka
Prof. Dr. Márta Rencz
Collection 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 collection 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

  • heat pumps
  • minigaps
  • minichannels
  • compact heat exchangers
  • heat transfer enhancement
  • two-phase flow
  • computational methods for solving heat transfer problems
  • thermal management
  • refrigerant charge reduction
  • additive manufacturing
  • production engineering
  • renewable energy
  • energy efficiency
  • quality management tools
  • quality function deployment (QFD)

Published Papers (5 papers)

2023

Jump to: 2021

19 pages, 4919 KiB  
Article
Heat Transfer Calculations during Flow in Mini-Channels with Estimation of Temperature Uncertainty Measurements
Energies 2023, 16(3), 1222; https://doi.org/10.3390/en16031222 - 23 Jan 2023
Cited by 3 | Viewed by 981
Abstract
The main aim of this work was to provide heat transfer calculations of flow boiling in mini-channels with an application for the Trefftz functions. The test section comprised five parallel mini-channels with a depth of 1 mm, with a common heated wall. For [...] Read more.
The main aim of this work was to provide heat transfer calculations of flow boiling in mini-channels with an application for the Trefftz functions. The test section comprised five parallel mini-channels with a depth of 1 mm, with a common heated wall. For the estimation of the temperature uncertainty, during the experiment the temperature measurement was performed with the use of K-type thermoelements and an infrared camera in two mini-channels simultaneously. According to the Guide to the Expression of Uncertainty in Measurement, the Monte Carlo method is a practical alternative to the GUM uncertainty framework. Since the uncertainty components are not approximately the same magnitude, the Monte Carlo method was indicated to estimate the uncertainty of the surface temperature measurement. The results obtained from this simulation method were compared with the results of the computation related to the uncertainty propagation method. The results of both methods of temperature measurement were found to be consistent. The results of the statistical analysis were used to describe heat transfer calculations. The heat transfer investigations concerning the subcooled boiling region were performed during the other experiment. The local heat transfer coefficients on the contact surface between the working fluid and the heated wall were calculated from the Robin boundary condition. The mathematical model described by the heat equation in the mini-channel wall and by the Fourier-Kirchhoff equation in a flowing fluid leads to an inverse heat transfer problem. This problem was solved using the FEM with the Trefftz-type basis functions. The estimation of temperature uncertainty measurements due to the Monte Carlo method was included in the final results of the heat transfer coefficient. Full article
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2021

Jump to: 2023

15 pages, 2117 KiB  
Article
Comparison of the Efficiency of Two Types of Heat Exchangers with Parallel Plates Made of Varied Materials
Energies 2021, 14(24), 8562; https://doi.org/10.3390/en14248562 - 19 Dec 2021
Cited by 1 | Viewed by 1819
Abstract
The paper discusses two mathematical models for the air flow through a plate heat exchanger with parallel plates. The first exhausts the used air and then supplies the fresh air. The second exhausts the used air above the plate and simultaneously supplies fresh [...] Read more.
The paper discusses two mathematical models for the air flow through a plate heat exchanger with parallel plates. The first exhausts the used air and then supplies the fresh air. The second exhausts the used air above the plate and simultaneously supplies fresh air under it (counter-flow exchanger). In both cases, the exhaust air heat is used to heat the supply air. The purpose of the research is to verify which exchanger uses the exhaust air heat more efficiently. The method of the Trefftz function was used to determine approximate solutions of the analysed problems. The results obtained for 1.2 mm thick steel, aluminium, and copper plates and for external winter, summer, and spring–autumn temperatures are discussed. The results indicate that steel is the best material for a plate heat exchanger, and the counter-flow exchanger is more efficient of the two. Thanks to the use of thin steel plates and the reduction of the air exchange time to a few minutes, cheap and efficient counter-flow exchangers can be obtained. Full article
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15 pages, 3159 KiB  
Article
Heat Transfer Effect on Micro Gas Turbine Performance for Solar Power Applications
Energies 2021, 14(20), 6745; https://doi.org/10.3390/en14206745 - 16 Oct 2021
Cited by 2 | Viewed by 2320
Abstract
This paper presents an experimentally validated computational study of heat transfer within a compact recuperated Brayton cycle microturbine. Compact microturbine designs are necessary for certain applications, such as solar dish concentrated power systems, to ensure a robust rotodynamic behaviour over the wide operating [...] Read more.
This paper presents an experimentally validated computational study of heat transfer within a compact recuperated Brayton cycle microturbine. Compact microturbine designs are necessary for certain applications, such as solar dish concentrated power systems, to ensure a robust rotodynamic behaviour over the wide operating envelope. This study aims at studying the heat transfer within a 6 kWe micro gas turbine to provide a better understanding of the effect of heat transfer on its components’ performance. This paper also investigates the effect of thermal losses on the gas turbine performance as a part of a solar dish micro gas turbine system and its implications on increasing the size and the cost of such system. Steady-state conjugate heat transfer analyses were performed at different speeds and expansion ratios to include a wide range of operating conditions. The analyses were extended to examine the effects of insulating the microturbine on its thermodynamic cycle efficiency and rated power output. The results show that insulating the microturbine reduces the thermal losses from the turbine side by approximately 11% without affecting the compressor’s performance. Nonetheless, the heat losses still impose a significant impact on the microturbine performance, where these losses lead to an efficiency drop of 7.1% and a net output power drop of 6.6% at the design point conditions. Full article
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14 pages, 2570 KiB  
Article
Comparison of Cooling Systems in Power Plant Units
Energies 2021, 14(19), 6365; https://doi.org/10.3390/en14196365 - 05 Oct 2021
Cited by 2 | Viewed by 1460
Abstract
A new porous system in power plants allowing the management of the crisis of heat exchange at boiling water in porous structures has been investigated. This study refers to the thermal power plants of electrical power stations and devices for cutting natural and [...] Read more.
A new porous system in power plants allowing the management of the crisis of heat exchange at boiling water in porous structures has been investigated. This study refers to the thermal power plants of electrical power stations and devices for cutting natural and artificial mineral media. Combustion chambers and supersonic nozzles were cooled by different porous structures. The optimum cell sizes of the porous structures were determined and data on the heat transfer capacity for the (critical) heat flow were obtained. A thermal device in the form of a rocket-type burner with a detonation jet showed high efficiency for capillary-porous and flow-through cooling systems. The economic effect per burner is not less than 200–300 dollars, and the coolant consumption is reduced by dozens of times, which is environmentally important. A comparative evaluation of the investigated structures and coatings has advantages over other cooling systems. The integration of mesh structures with capillary-porous coatings of natural mineral media produces a synergistic effect of combining them into a technology of their manufacturing, the expansion of critical loads removal and control of the limit state of the coatings. Full article
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24 pages, 5271 KiB  
Article
Time-Dependent Heat Transfer Calculations with Trefftz and Picard Methods for Flow Boiling in a Mini-Channel Heat Sink
Energies 2021, 14(7), 1832; https://doi.org/10.3390/en14071832 - 25 Mar 2021
Cited by 9 | Viewed by 2011
Abstract
The intensification of heat transfer using two-phase boiling flow in mini-channels is widely used to dissipate the high heat fluxes in miniaturized electronic devices. However, the process itself is not fully recognized and still requires experimental studies and developing computation methods appropriate for [...] Read more.
The intensification of heat transfer using two-phase boiling flow in mini-channels is widely used to dissipate the high heat fluxes in miniaturized electronic devices. However, the process itself is not fully recognized and still requires experimental studies and developing computation methods appropriate for them. The main aim of this work was the mathematical modeling of time-dependent heat transfer process in FC-72 flow boiling in a mini-channel heat sink with five parallel mini-channels of 1 mm depth. Channels have an asymmetrically heated wall while its outer temperature was measured by infrared thermography. The opposite wall of the mini-channels was transparent, helping to record flow patterns due to a high-speed digital camera. The objective of the numerical calculations was to determine the heat transfer coefficient on the wall-fluid contact surface from the Robin boundary condition. The problem was solved using methods based on the Trefftz-type functions. Three mathematical methods were applied in calculations: the FEM with Trefftz type basis functions, the Classical Trefftz Method, and the Hybrid Picard-Trefftz Method. The results were compared with the values of the heat transfer coefficient obtained from theoretical correlations from the literature. Full article
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Planned Papers

The below list represents only planned manuscripts. Some of these manuscripts have not been received by the Editorial Office yet. Papers submitted to MDPI journals are subject to peer-review.

Title: Applications of selected quality management for estimation of minichannel heat exchanger efficiency
Authors: Magdalena Piasecka, Sylwia Hożejowska, Artur Piasecki, Aneta Masternak-Janus
Affiliation: -
Abstract: The planned work focusses on the issue of designing a minichannel heat exchanger for cooling electronic systems, such as computer processors. The experimental investigations on heat transfer phenomena, as well as mathematical modelling and methods of solution of the formulated theoretical problems, which allowed to estimate the intensity of the heat exchange process during flow in minichannels, are presented. The two-dimensional approach is used to describe the heat flow in the major elements of the model exchanger, the heated plate and the channels in which the cooling fluid flows. The thermal efficiency of the minichannel heat exchanger is estimated. Two methods of quality management, i.e. QFD and FMEA, are used to determine which product features are the most important to increase the efficiency of the device and which of the customer requirements should be taken as key. The application of selected quality management methods allows for a significant reduction in time needed to reach the appropriate design and material solutions and determine the desired operating parameters of an innovative heat exchanger for cooling miniature electronic devices and systems.

Title: Analytical prediction of the thermal behavior of semiconductor power devices a in wide temperature range from room temperature i-v measurements.
Authors: S.Ress, G.Farkas, M.Rencz
Affiliation: Department of Electron Devices, Budapest University of Technology and Economics, Magyar tudósok krt. 2, Bld. Q, H-1117 Budapest, Hungary

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