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Energies
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Cooling and Heat Exchange Systems
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Cooling and Heat Exchange Systems

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 (30 November 2023) | Viewed by 6571

Special Issue Editor

Dr. Pascal Clain

E-Mail Website
Guest Editor
Research Center, Leonard de Vinci Pôle Universitaire, 92916 Paris La Défense, France
Interests: cold storage; air conditioning; secondary refrigeration; phase change materials; gas hydrates; ice slurry

Special Issue Information

Dear Colleagues,

The guest editors of the Energies Special Issue on "Cooling and Heat Exchange Systems" cordially invite you to submit your high-quality manuscripts to the Special Issue. Over the last decade, important improvements have been achieved in terms of design, new materials, surface treatment, improved heat transfer, and/or the associated performance of different types of heat exchangers in cooling and heating systems. Any improvement in heat transfer results in enhancement in the overall performance of the device. These include single-phase or phase-change fluids or suspensions, new materials such as phase-change material and their composites, advanced topology, improved heat transfer surface, and new or improved types of heat exchangers and manufacturing technologies. We invite papers on innovative technical developments, reviews, and case studies, as well as analytical and assessment papers from different disciplines that are relevant to the topic.

Dr. Pascal Clain
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 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

  • air conditioning systems
  • heat and cold storage systems
  • surface treatment
  • multiphase flow
  • numerical simulation
  • energy efficiency
  • heat exchanger
  • enhanced heat transfer
  • energy efficiency
  • composites
  • advanced energy materials
  • working fluid
  • regenerator
  • recuperator
  • evaporator
  • condenser
  • additive manufacturing
  • phase change materials
  • slurry
  • secondary refrigeration

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Published Papers (3 papers)

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Research

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15 pages, 4134 KiB  
Article
The Effect of Nozzle Configuration on Adsorption-Chiller Performance
by Wojciech Kalawa, Karol Sztekler, Jakub Kozaczuk, Łukasz Mika, Ewelina Radomska, Wojciech Nowak and Andrzej Gołdasz
Energies 2024, 17(5), 1181; https://doi.org/10.3390/en17051181 - 1 Mar 2024
Cited by 1 | Viewed by 1197
Abstract
Broadly defined climate protection is a powerful incentive in the search for environmentally friendly refrigeration technologies. Adsorption chillers are considered to be one such technology; however, their main disadvantages include a low cooling capacity, a low energy efficiency ratio (EER), and cyclic operation. [...] Read more.
Broadly defined climate protection is a powerful incentive in the search for environmentally friendly refrigeration technologies. Adsorption chillers are considered to be one such technology; however, their main disadvantages include a low cooling capacity, a low energy efficiency ratio (EER), and cyclic operation. Thus, a great deal of effort is being put into improving adsorption-chiller performance. In this paper, the influence of the spray angle, the number of nozzles, and the water flow rate through the nozzles on adsorption-chiller performance was investigated. Adsorption-chiller performance was investigated mainly in terms of the cooling capacity (CC), the energy efficiency ratio (EER), and the specific cooling power (SCP). The results indicated that the chiller’s cooling capacity increased from about 210 W to 316 W and that the EER increased from 0.110 to 0.167 when the spray angle of the nozzles was increased from 90° to 120°. It was also reported that increasing the flow rate of water through the nozzles did not improve the average cooling capacity or the other performance parameters but resulted in more stable operation of the chiller. Additionally, using six nozzles instead of three improved the average cooling capacity and EER tenfold. Full article
(This article belongs to the Special Issue Cooling and Heat Exchange Systems)
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16 pages, 5134 KiB  
Article
An Increase in the Energy Efficiency of R744 Heat-Using Thermotransformers
by Vyacheslav Arsenyev, Ján Piteľ, Oleksandr Korol, Serhii Sharapov, Jana Mižáková, Ivan Pavlenko and Vitalii Ivanov
Energies 2023, 16(21), 7372; https://doi.org/10.3390/en16217372 - 31 Oct 2023
Cited by 1 | Viewed by 1037
Abstract
This article deals with improving waste heat transformation in heat-using thermotransformers. Based on the directives of the European Commission on refrigeration equipment requirements, the possibility of using carbon dioxide (R744) in heat-using thermotransformers was evaluated. The possibility of the effective use of heat-using [...] Read more.
This article deals with improving waste heat transformation in heat-using thermotransformers. Based on the directives of the European Commission on refrigeration equipment requirements, the possibility of using carbon dioxide (R744) in heat-using thermotransformers was evaluated. The possibility of the effective use of heat-using thermotransformers operating within the Chistyakov–Plotnikov cycle in the heat pump mode was assessed. As a result, a comparative analysis was performed with existing modern plants for combined cycles with an expander, for the expansion of CO2 in saturated steam, a suction gas heat exchanger (SGHE), and a compressor–expander unit. The design schemes with a throttling device and an SGHE were selected for a comparative analysis. As a result, calculation models for evaluating the operating parameters for the initial and proposed design schemes were developed. These models allow for evaluating thermodynamic and mode parameters for heat-reducing thermotransformers. They also allow for ensuring energy efficiency indicators and conversion factors for each cycle. Overall, the dependencies for the cycle conversion ratio for the pressure increase stage in the compressor were obtained for various under-recovery rates. Moreover, the cycle conversion ratios for the proposed design schemes were obtained depending on the discharge pressure of the first compressor. The proposed design schemes allow for increasing the energy efficiency of heat-using thermotransformers by an average of 23%, depending on the suction pressure in the compressor. Full article
(This article belongs to the Special Issue Cooling and Heat Exchange Systems)
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Review

Jump to: Research

25 pages, 3633 KiB  
Review
Performance and Efficiency of Cross-Flow Fans—A Review
by Hamid Reza Vanaei, Sofiane Khelladi, Ivan Dobrev, Farid Bakir, Rania M. Himeur, Amrid Mammeri and Kamel Azzouz
Energies 2023, 16(23), 7798; https://doi.org/10.3390/en16237798 - 27 Nov 2023
Cited by 1 | Viewed by 3938
Abstract
Cross-Flow Fans (CFFs) have been widely applied in the automotive and domestic air conditioning industries in recent decades. They are high-pressure coefficient turbomachines compacted diametrically, and thus, the complex interactions of these fans require thorough evaluation. Their innovation has opened up new directions [...] Read more.
Cross-Flow Fans (CFFs) have been widely applied in the automotive and domestic air conditioning industries in recent decades. They are high-pressure coefficient turbomachines compacted diametrically, and thus, the complex interactions of these fans require thorough evaluation. Their innovation has opened up new directions in turbomachinery, and both academic research and industry have seen numerous efforts to develop these types of fans. Despite extensive work, optimizing and improving their performance remains a challenge. Enhancing their efficiency necessitates improvements in structural characteristics, aerodynamic features, and acoustic properties. In this review, we aim to demonstrate the essential aspects of CFFs by introducing their fundamentals and primary characteristics. Furthermore, we delve into a discussion on the acoustic performance of these fans. We also summarize the flow characteristics and different flow-field patterns in CFFs and their impact on aeroacoustic behavior. The main objective of this review paper is to provide an overview of the research in this field, summarizing the critical factors that play a significant role in studying CFFs’ performance. Full article
(This article belongs to the Special Issue Cooling and Heat Exchange Systems)
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