Special Issue "Heat Transfer Optimization in Physical Processes, Thermal Systems, and Pollutant Reduction"
A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "Thermal Management".
Deadline for manuscript submissions: 15 December 2021.
Special Issue Editor
Interests: energy conversion processes; circular economy; numerical model; sustainable buildings and infrastructures; sustainable transports; physical processes in experimental tests; heat transfer; pollutant emissions; engine efficiency; combustion process; thermal systems; alternative fuels; waste management; climate changes; smart cities
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Special Issue Information
Dear Colleagues,
As highlighted in the seventh Sustainable Development Goal, of the 17 SDGs defined in the 2030 Agenda of the United Nations, the development of clean and affordable energy in different areas of the world is a necessity. The heat transfer optimization in thermal systems is fundamental to obtaining more efficient and environmentally friendly solutions.
This Special Issue will collect a series of scientific articles that report important actions taken to improve aspects of thermal performance optimization and pollution reduction, which may include all energy processes as biomass conversion, waste, engines, combustion, CHP, and CCPP systems, and also the thermal comfort and the environmental impact of infrastructure and buildings. Articles are invited from all countries.
Dr. Guido Marseglia
Guest Editor
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 papers will be 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 2000 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
- Thermal systems
- circular economy
- heat transfer
- sustainable buildings and infrastructures
- pollution reduction
- renewable energies
- thermal comfort
- heat exchange
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: Heat Transfer Analysis of A Counterflow Heat Exchanger with Two Rectangular Minichannels
Authors: Magdalena Piasecka*, Dariusz Strąk, Sylwia Hożejowska, Anna Pawińsk
Affiliation: Kielce University of Technology, Poland
Abstract: This paper presents the results of research on heat transfer during fluid flow in a counterflow heat exchanger with two rectangular minichannels. In one channel there was a flow of Fluorinert FC-72 while in the other distilled water was circulated. Refrigerant FC-72 was heated by the outer heating wall. In the second minichannel, there was a countercurrent flow of distilled water. The channels were separated by a copper plate. Thermal imaging cameras were used to measure the temperature distribution of the outer surfaces of the heat exchanger. The experiments involved measuring the heat flux supplied to the heating wall and the temperature and pressure of the fluids at the inlet and outlet to/from each channel. The purpose of the calculations was to determine the heat transfer coefficients at the contact surfaces: the heating wall - FC-72 and the copper plate - distilled water. Two approaches to describe the heat flow in the heat exchanger have been proposed: one-dimensional (1D) and two-dimensional (2D). In the 1D approach, only the heat flow direction perpendicular to the fluid flow direction was assumed. The 2D approach additionally involved the direction along the flow. In this model, it was assumed that the temperature of the heating plate and the copper partition meets the Poisson and Laplace equations, respectively, supplemented by the boundary conditions system. Trefftz functions were used in numerical calculations. The results were presented in the form of graphs of heat transfer coefficients as a function of the distance from the inlet. The analysis of the results showed that the values and distributions of the heat transfer coefficient determined using both models were similar. An application of the proposed heat exchanger with minichannels concept for cooling PV cells has been proposed.
Title: A New Direct Analytical Model of Ejector for On-Design Optimal Performance Prediction of Heat Driven Cooling Systems
Authors: Fahid Riaz1,2,*, Fu Zhi Yam1, Muhammad Abdul Qyyum3*, Saqib Anwar4, Ahmed M. El-Sherbeeny4, Poh Seng Lee1
Affiliation: 1 Department of Mechanical Engineering, National University of Singapore, 9 Engineering Drive 1, 117575, Singapore; [email protected] (F.R); [email protected] (F. Z. Y); [email protected] (P. S. L)
2 Department of Mechanical Engineering, University of Engineering and Technology, Lahore, Pakistan
3 School of Chemical Engineering, Yeungnam University, Dae-dong 712-749, Republic of Korea
4 Industrial Engineering Department, College of Engineering, King Saud University, P.O. Box 800, Riyadh, 11421, Saudi Arabia; [email protected] (S. A); [email protected] (A. M. E)
* Correspondence: [email protected] (M.A.Q)
Abstract: Abstract: This paper describes an ejector model for the prediction of on-design performance under available conditions. This is a more direct method of estimating the ejector performance without the need for iterations. This model avoids using ideal gas assumption for the working fluid and uses real fluid properties in calculations. The ideal gas assumption is used only to predict the pressure of the mixing chamber having lower-pressure vapour. Three efficiencies are used to account for losses in the ejector and their values are found out by using CFD analysis. Both experimental and analytical data from literature are used to validate the presented analytical model with good agreement for on-design performance. R245fa has been used as a suitable working fluid for low-grade heat applications. Engineering Equation Solver has been used to program the proposed model. This presented model is suitable for system optimization because of its direct and simpler calculation method. This model does not consider geometrical dimensions and hence cannot be used for off-design performance and detailed design of ejectors. For detailed design, CFD or experimental investigation is required. A systematic approach for using CFD for detailed design and sizing of ejectors is also presented.