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Modeling and Optimization of Heat Exchangers, Refrigeration and Heat Pump...
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Modeling and Optimization of Heat Exchangers, Refrigeration and Heat Pump Systems

A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "J: Thermal Management".

Deadline for manuscript submissions: 29 October 2024 | Viewed by 2993

Special Issue Editors

Dr. Yunguang Chen

E-Mail Website
Guest Editor
Department of Refrigeration & Cryogenic Engineering, School of Energy & Power Engineering, Xi'an Jiaotong University, Xi'an 710049, China
Interests: modeling, optimization and control of refrigeration and heat pump systems; transcritical CO2 refrigeration and heat pump systems; optimal design of heat exchangers; energy-saving technologies for cold-chain systems
Prof. Dr. Zhe Zhang

E-Mail Website
Guest Editor
Tianjin Key Laboratory of Refrigeration Technology, Tianjin University of Commerce, Tianjin 300134, China
Interests: high-efficiency refrigeration system; heat exchanger modeling and optimization; flow distribution in heat exchangers

Special Issue Information

Dear Colleagues,

Refrigeration and heat pump systems are extensively used in air conditioning, food storage and transportation, space heating and many kinds of industrial applications, and consume a large amount of energy. Thus, there is a continuous need for the design optimization of refrigeration and heat pump systems to improve system efficiency, mitigate environmental impacts and reduce costs. In order to achieve these goals, a large number of system designs need to be evaluated through theoretical analysis, numerical simulation or experimental methods, but this is usually a difficult and time-consuming process. Among those approaches, numerical modeling is a powerful and efficient way to help engineers to properly select design parameters and optimize heat exchanger and system designs, which can save a lot of costs and time.

The purpose of this Special Issue is to attract state-of-the-art research and review articles on the modeling and optimization of refrigeration and heat pump systems and components. Experimental studies are also welcomed. Topics of interest include, but are not limited to, the following:

  • Optimal design of heat exchangers;
  • System and component modeling;
  • Optimization method;
  • Experimental investigation;
  • Compact heat exchangers;
  • Alternative refrigerant-based cycles and systems;
  • Optimal control of refrigeration and heat pump systems

Dr. Yunguang Chen
Prof. Dr. Zhe Zhang
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

  • enhanced heat transfer
  • steady-state modeling
  • dynamic modeling
  • compact heat exchanger
  • multidisciplinary optimization
  • thermal management
  • alternative refrigerants
  • refrigeration
  • heat pump

Published Papers (3 papers)

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Research

20 pages, 6622 KiB  
Article
Machine Learning Assisted Microchannel Geometric Optimization—A Case Study of Channel Designs
by Long Huang, Junjia Zou, Baoqing Liu, Zhijiang Jin and Jinyuan Qian
Energies 2024, 17(1), 44; https://doi.org/10.3390/en17010044 (registering DOI) - 21 Dec 2023
Cited by 1 | Viewed by 812
Abstract
At present, microchannel heat exchangers are widely applied in the fields of air-conditioning and heat pumping applications given their high heat transfer performance, compact size, and low material cost. However, designing and optimizing the channel geometries remain challenging, as they require balancing multiple [...] Read more.
At present, microchannel heat exchangers are widely applied in the fields of air-conditioning and heat pumping applications given their high heat transfer performance, compact size, and low material cost. However, designing and optimizing the channel geometries remain challenging, as they require balancing multiple competing objectives to achieve the optimal performance. This study investigates various parameters, including the channel count, wetted perimeter, cross-sectional area, and mass flow rate for each channel, to achieve the optimal efficiency. The optimization objectives include maximizing the heat transfer rate, minimizing the refrigerant convective thermal resistance, maximizing the refrigerant heat transfer coefficient, and minimizing the pressure drop. A multi-objective genetic optimization algorithm, in conjunction with artificial neural network (ANN)-based machine learning models, was used to predict the heat transfer rate to speed up the calculation process during the optimization. We identified that a gradient reduction in the wetted perimeter from the air inlet along the airflow direction could enhance the heat transfer rate. Additionally, the results indicate that an increase in the number of channels leads to an enhanced heat transfer efficiency rate. However, with the increase in the number of channels, the cross-sectional area of each channel is correspondingly reduced to maintain a consistent overall cross-sectional area. This reduction increases the fluid resistance, leading to an increased pressure drop across the system. This observation is critical for a microchannel design optimization, highlighting the importance of attaining a balance between achieving a higher heat transfer efficiency and maintaining a favorable fluid dynamic performance. Full article
(This article belongs to the Special Issue Modeling and Optimization of Heat Exchangers, Refrigeration and Heat Pump Systems)
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23 pages, 8301 KiB  
Article
Passive Mixing and Convective Heat Transfer Enhancement for Nanofluid Flow across Corrugated Base Microchannels
by Ali Ammar Naqvi, Emad Uddin and Muhammad Zia Ullah Khan
Energies 2023, 16(23), 7893; https://doi.org/10.3390/en16237893 - 3 Dec 2023
Viewed by 842
Abstract
Vortex generators and pin fins are conventionally used to deliver fluid mixing and improved convective heat transfer. The increased pressure loss following a fractional increase in heat transfer, as well as the complex manufacturing design, leave room for improvement. The present work proposes [...] Read more.
Vortex generators and pin fins are conventionally used to deliver fluid mixing and improved convective heat transfer. The increased pressure loss following a fractional increase in heat transfer, as well as the complex manufacturing design, leave room for improvement. The present work proposes a novel diverging–converging base corrugation model coupled with vortex generation using simple geometrical modifications across rectangular microchannels to ensure a superior performance. The Nusselt number, friction factor, and flow phenomenon were numerically studied across a Reynolds number range of 50–1000. The optimum cross-section of the microchannel-generating vortices was determined after thorough study, and base corrugation was further added to improve heat transfer. For the vortex–corrugation modeling, the heat transfer enhancement was verified in two optimized cases: (1) curved corrugated model, (2) interacting corrugated model. In the first case, an optimized curve generating Dean vortices was coupled with base corrugation. An overall increase in the Nusselt number of up to 32.69% and the thermal performance of “1.285 TPF” were observed at a high Reynolds number. The interacting channels with connecting bridges of varying width were found to generate vortices in the counter-flow configuration. The thermal performance of “1.25 TPF” was almost identical to the curved corrugated model; however, a major decrease in pressure, with a loss of 26.88%, was observed for this configuration. Full article
(This article belongs to the Special Issue Modeling and Optimization of Heat Exchangers, Refrigeration and Heat Pump Systems)
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15 pages, 3187 KiB  
Article
Experimental Study on the Feasibility of Quick Startup of Instant Heat Pump Water Heaters Based on Active Control of Heat Sink Flow Step
by Fujun Ju, Zhenzhen Mu, Guozhu Li, Lihao Hou, Xiaowei Fan, Hongtao Liu, Qinglei Liu and Wenbo Liu
Energies 2023, 16(17), 6145; https://doi.org/10.3390/en16176145 - 24 Aug 2023
Viewed by 928
Abstract
The influence of flow step ratio (FSR) on the startup characteristics of instant heat pump water heaters (IHPWHs) with natural mixture M (R744/R290 (12/88)) under nominal conditions was studied experimentally to verify the feasibility of a new quick startup method. The results show [...] Read more.
The influence of flow step ratio (FSR) on the startup characteristics of instant heat pump water heaters (IHPWHs) with natural mixture M (R744/R290 (12/88)) under nominal conditions was studied experimentally to verify the feasibility of a new quick startup method. The results show that the FSR had a marked effect on the startup time of system performance parameters. Under the optimal FSR of 0.6, the shortest system startup time and available hot water supply time were 700 s and 250 s, respectively, which were markedly shorter than those in the conventional startup. Therefore, rapid startup of the system and rapid production of usable domestic hot water can be realized by controlling the flow step. The influence of flow step on the variation trend of system performance parameters was obviously different, and there was no slow warming section for the heat sink outlet temperature (HSOT) under three FSRs. The HSOT, heating capacity, and high pressure side pressures had the maximum values in the quick startup, and the maximum values were obviously affected by the FSR. The FSR had no marked effect on the minimum suction pressure. The refrigerant pressures and refrigerant temperatures fluctuated markedly in both rapid and conventional starts. Full article
(This article belongs to the Special Issue Modeling and Optimization of Heat Exchangers, Refrigeration and Heat Pump Systems)
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