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Applied Sciences
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The10th Asian Conference on Refrigeration and Air-Conditioning (ACRA2022)
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The10th Asian Conference on Refrigeration and Air-Conditioning (ACRA2022)

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Applied Thermal Engineering".

Deadline for manuscript submissions: closed (20 December 2022) | Viewed by 5478

Special Issue Editor

Prof. Dr. Xiaohong Han

E-Mail Website
Guest Editor
College of Energy Engineering, Zhejiang University, Hangzhou 310027, China
Interests: refrigerant replacement; refrigerant leakage; refrigerant recovery and reclamation; high heat flux cooling technology (heat pipes, microchannel cooling and immersion cooling technology for data centers and power batteries)
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The ACRA (Asian Conference on Refrigeration and Air-conditioning) provides a forum for the presentation and exchange of scientific and industrial knowledge in the fields of HVAC&R. The first conference was held in 2002 in Kobe (2002), followed by events in Beijing (2004), Gyeongju (2006), Taipei (2009), Tokyo (2010), Xi’an (2012), Jeju Island (2014), Taipei (2016), and Sapporo (2018). The 10th Asian Conference on Refrigeration and Air-Conditioning (ACRA2022) will be hosted by the Chinese Association of Refrigeration from the 9th to 10th of April, 2022.

For this Special Issue, “The10th Asian Conference on Refrigeration and Air-Conditioning (ACRA2022)”, we are inviting the submission of papers presenting research in fields ranging from fundamental sciences to applied technologies. Topics of interest include, but are not limited to:

  • Compressor technologies;
  • Heat exchanger technologies;
  • New and natural refrigerants;
  • Related heat transfer technologies;
  • Innovative HVAC&R systems;
  • Automatic controls;
  • Cryogenics;
  • Sorption (absorption, adsorption) refrigeration;
  • District heating and cooling;
  • Energy utilization and conservation;
  • Renewable and new energy application;
  • Food technology and cold chain;
  • Indoor air quality;
  • Ventilation and air distribution;
  • Application of IT technology in HVAC&R;
  • Thermal/Fluid Science;

Prof. Dr. Xiaohong Han
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. Applied Sciences 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 2400 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

  • refrigeration equipment
  • refrigerants
  • heat pump
  • thermodynamic properties, heat transfer, cold chain, artificial intelligence, heat sink, air conditioning, cryogenics, energy utilization

Published Papers (4 papers)

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Research

15 pages, 3311 KiB  
Article
Study on the Dynamic Generation of Subcooled Water Using a Compact Heat Exchanger
by Pengwei Cheng, Kaijian Wang and Solomon Sinkolongo
Appl. Sci. 2023, 13(7), 4369; https://doi.org/10.3390/app13074369 - 29 Mar 2023
Viewed by 995
Abstract
The dynamic generation of ice slurry from subcooled water is one of the most promising ways to make ice; this process is utilized widely in ice storage air-conditioning systems. However, the random occurrence of ice blockage during the generation of subcooled water using [...] Read more.
The dynamic generation of ice slurry from subcooled water is one of the most promising ways to make ice; this process is utilized widely in ice storage air-conditioning systems. However, the random occurrence of ice blockage during the generation of subcooled water using conventional heat exchangers prevents the increase in subcooling, thereby reducing the efficiency of the release of the subcooled water and converting it into ice slurry. A more efficient approach to reducing the fluid passage time is to employ a compact heat exchanger with a highly efficient heat transfer performance, a heat transfer length of only 21.5 mm, and a hydraulic diameter of 0.32 mm. A compact heat exchanger was used to build a dynamic generation setup for subcooled water, and 40 wt% of non-freezing liquid and tap water was used as the working fluid for heat exchange to generate subcooled water. The results show that the compact heat exchanger can achieve a greater subcooling degree (3.8 K) and longer duration (108 min). This study further explored the potential for dynamic ice making from deep, subcooled water and improved the overall structure of the compact heat exchanger used. The experimental setup is recommended based on the analysis of the results. Full article
(This article belongs to the Special Issue The10th Asian Conference on Refrigeration and Air-Conditioning (ACRA2022))
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13 pages, 6683 KiB  
Article
Simulation of Vapor-Liquid Separation in the Orifice-Baffle Header under Various Operating Conditions
by Kunteng Huang, Jianyong Chen, Ying Chen, Xianglong Luo, Yingzong Liang, Jiacheng He and Zhi Yang
Appl. Sci. 2022, 12(16), 7971; https://doi.org/10.3390/app12167971 - 09 Aug 2022
Cited by 3 | Viewed by 1209
Abstract
Vapor-liquid separation during condensation enables the enhancement of heat transfer coefficient and reduction in pressure drop simultaneously. The vapor-liquid separator is vital to the performance of such a liquid-separation condenser (LSC). It should fulfill the functions of allowing the condensate to drain away [...] Read more.
Vapor-liquid separation during condensation enables the enhancement of heat transfer coefficient and reduction in pressure drop simultaneously. The vapor-liquid separator is vital to the performance of such a liquid-separation condenser (LSC). It should fulfill the functions of allowing the condensate to drain away as much as possible from the separator and leaving only vapor to continue condensing afterwards. However, due to the intensive interactions between the liquid and vapor, it is really hard to achieve perfect vapor-liquid separation, adding new uncertainties to the maldistributions in the branch outlets of a parallel condenser. To discover more insights of the flow conditions in the header and phase distributions, the characteristics of the orifice-baffle header are studied by using CFD and the mechanistic model for the droplet analysis is established by means of force balance in this paper. A parametrical analysis is carried out to discover the effects of operating conditions. It is found that the maximum vapor-liquid separation efficiency (η) is 51.94% as the inlet mass flow rate (ṁin) is 12 g/s. The vapor leakage from the orifice because of the liquid impact is one of the main reasons that deteriorate the vapor-liquid separation performance. Moreover, the vortex in the header increases the local mass flux, thereafter decreasing the droplet diameter. With the increasing of ṁin, the dominant force of the droplet in the vertical direction switches from FG to FD2. Full article
(This article belongs to the Special Issue The10th Asian Conference on Refrigeration and Air-Conditioning (ACRA2022))
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12 pages, 2903 KiB  
Article
Experimental Research on Dynamic Filtering Characteristics of Filter Materials for Electrostatic-Fabric Integrated Precipitator
by Kuixu Chen, Yaji Huang, Sheng Wang, Zhaoping Zhu and Haoqiang Cheng
Appl. Sci. 2022, 12(12), 5824; https://doi.org/10.3390/app12125824 - 08 Jun 2022
Viewed by 1314
Abstract
In recent years, the electrostatic-fabric integrated precipitator has been widely used, and the dust filtration performance of the core component filter bag is the most important factor affecting its dust removal efficiency. In this work, the dynamic dust removal performance of different types [...] Read more.
In recent years, the electrostatic-fabric integrated precipitator has been widely used, and the dust filtration performance of the core component filter bag is the most important factor affecting its dust removal efficiency. In this work, the dynamic dust removal performance of different types of filter media and different experimental conditions were studied on the filter media filtration performance test platform. The experimental study of the filtration performance of different types of filter media showed that the filtration performance stability of polyphenylene sulfide (PPS) filter media was better than that of polyimide (PI) and polytetrafluoroethylene (PTFE) filter media. Increasing the mass per unit area of the filter media had obvious advantages in the short term, and the impregnation process was beneficial to the filter performance of the filter media. Membrane-coated filter media had the best filtration performance, gradient filter media filtration performance was the second, followed by conventional filter media, ordinary blended, and ultrafine blended filter media. Studies with different experimental conditions found that the filtration efficiency increased with increasing resistance, was not significantly affected by changes in inlet dust concentration, but decreased with the increasing filtering velocity. This experimental results provided an important basis for the selection of filter bags for the electrostatic-fabric integrated precipitator project. Full article
(This article belongs to the Special Issue The10th Asian Conference on Refrigeration and Air-Conditioning (ACRA2022))
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12 pages, 1811 KiB  
Article
Simulation of Coupled Heat-Mass Transfer in Sea Cucumbers with Heat Pump Drying
by Haibo Zhao, Jiaao Dai and Kun Wu
Appl. Sci. 2022, 12(11), 5508; https://doi.org/10.3390/app12115508 - 29 May 2022
Cited by 3 | Viewed by 1281
Abstract
To study the heat and moisture transfer behavior in sea cucumbers with heat pump convective drying, a multi-physical field coupled model including the velocity field, temperature field, and dilute matter transfer in the porous media of sea cucumbers is built. The heat pump [...] Read more.
To study the heat and moisture transfer behavior in sea cucumbers with heat pump convective drying, a multi-physical field coupled model including the velocity field, temperature field, and dilute matter transfer in the porous media of sea cucumbers is built. The heat pump drying experiments verified the results of numerical simulation. The results show that the moisture content on the dry basis of a sea cucumber decreases from the surface to the inside. The sea cucumber’s surface temperature increases gradually with drying until it reaches an equilibrium temperature, while the time required decreases with the increase in wind speed. The dry basis moisture content at the center of three different samples decreases from the initial values of 17.29, 13.48, and 7.73 to 3.25, 1.80, and 0.66, respectively. Further, the surface temperatures reached 40 °C, 33 °C, and 30 °C, which are the same as the inlet temperature. The simulated results were within 11% of the experimental ones, showing good consistency for both the dry basis moisture contents and temperatures. This research proves that a coupled heat and mass transfer model based on the porous medium theory can well describe the heat and mass transfer characteristics of sea cucumber with heat pump drying. It is also useful for studies on drying process optimization and quality improvement of aquatic products with heat pump drying. Full article
(This article belongs to the Special Issue The10th Asian Conference on Refrigeration and Air-Conditioning (ACRA2022))
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