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Applied Sciences
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Sciences and Innovations in Heat Pump/Refrigeration
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Sciences and Innovations in Heat Pump/Refrigeration

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Energy Science and Technology".

Deadline for manuscript submissions: closed (31 December 2019) | Viewed by 8751

Special Issue Editors

Prof. Dr. Takahiko Miyazaki

E-Mail Website
Guest Editor
Faculty of Engineering Sciences, Kyushu University, 6-1 Kasuga koen, Kasuga-shi, Fukuoka 816-8580, Japan
Interests: heat pump and refrigeration; thermally driven heat pump; air conditioning; refrigerant; adsorption; desiccant; optimization
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Koji Enoki

E-Mail Website
Guest Editor
Graduate School of Informatics and Engineering, The University of Electro-Communications, 1-5-1 Chofugaoka, Chofu, Tokyo 182-8585, Japan
Interests: heat pump and refrigeration; phase-change heat transfer; multiphase flow; heat exchanger; heat transfer enhancement; utilization of waste heat; jet flow; deep learning
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

This Special Issue is a continuation from the previous Special Issue “Sciences in Heat Pump and Refrigeration”, which was successfully closed in September 2018, and we wish to attract publications related to heat pump and refrigeration. As heat pump and refrigeration are technologies used in a variety of applications, for example, air-conditioning, food preservation, hot water and steam generation, drying, cryogenic storage, etc., the related research area spans is very broad and includes both basic science and advanced engineering. Therefore, the new Special Issue welcomes basic scientific studies, such as the prediction of refrigerant properties by molecular simulation, new materials for thermally driven heat pumps, as well as applied scientific studies that lead to innovation, such as the application of AI and heat transfer enhancement by nanostructures, amongst others.

Prof. Takahiko Miyazaki
Prof. Koji Enoki
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. 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

  • low global warming potential refrigerant
  • absorption/adsorption heat pump and refrigeration
  • desiccant air conditioning
  • heat and mass transfer enhancement
  • innovative heat exchangers
  • application of AI for air-conditioning
  • visualization
  • system optimization and dynamic control

Published Papers (3 papers)

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Research

11 pages, 3936 KiB  
Article
Heat Transfer Enhancement of Falling Film Evaporation on a Horizontal Tube by Thermal Spray Coating
by Tsutomu Ubara, Hitoshi Asano and Katsumi Sugimoto
Appl. Sci. 2020, 10(5), 1632; https://doi.org/10.3390/app10051632 - 29 Feb 2020
Cited by 7 | Viewed by 3997
Abstract
Falling film evaporators are gaining popularity as substitutes to typical flooded evaporators because of their low refrigerant charge. It is important to form and keep a thin liquid film on the heat transfer surface to ensure their high heat transfer performance. In this [...] Read more.
Falling film evaporators are gaining popularity as substitutes to typical flooded evaporators because of their low refrigerant charge. It is important to form and keep a thin liquid film on the heat transfer surface to ensure their high heat transfer performance. In this study, as a heat transfer enhancement surface, a fine porous surface processed using thermal spray coating was applied to a smooth copper tube with an outer diameter of 19.05 mm. Heat transfer coefficients of falling film evaporation on a single horizontal tube were experimentally evaluated using the HFC-134a refrigerant. The experiments were performed at a saturation temperature of 20 °C with the heat flux ranging from 10 to 85 kW·m−2 and for film Reynolds numbers up to 673. The study aimed to clarify the effect of the coating on the heat transfer characteristics of falling film evaporation. The results revealed that the coating could suppress partial dry out and enhance nucleate boiling in the falling film. The maximum heat transfer enhancement factor was 5.2 in the experimental range. It was further noted that the effect of the coating was especially strong under a low heat flux condition. Full article
(This article belongs to the Special Issue Sciences and Innovations in Heat Pump/Refrigeration)
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15 pages, 1730 KiB  
Article
Influence of Phase Change Phenomena on the Performance of a Desiccant Dehumidification System
by Indri Yaningsih, Agung Tri Wijayanta, Kyaw Thu and Takahiko Miyazaki
Appl. Sci. 2020, 10(3), 868; https://doi.org/10.3390/app10030868 - 27 Jan 2020
Cited by 4 | Viewed by 2083
Abstract
Demands of standalone dehumidification systems have been increasing in order to realize energy savings in air-conditioning processes. In a desiccant dehumidification system, the water vapor from the moist air undergoes a phase change phenomenon, this being from vapor to adsorbed phase, a process [...] Read more.
Demands of standalone dehumidification systems have been increasing in order to realize energy savings in air-conditioning processes. In a desiccant dehumidification system, the water vapor from the moist air undergoes a phase change phenomenon, this being from vapor to adsorbed phase, a process analogous to latent heat exchange. The energy exchange involved in such a process is often significant—up to 80% of the total energy exchange. In this study, the influence of the phase change phenomena involved in a desiccant dehumidification system was evaluated experimentally, along with the performance investigation under low desorption air temperatures of 308, 318, 328, 338, and 345 K. The system was driven by a constant adsorption temperature of 293 K. The dehumidification ability, latent heat ratio, and latent effectiveness were employed as key performance indexes. The results showed that with the increased desorption temperature, the latent heat ratio decreased, whereas the dehumidification ability and latent effectiveness increased. The highest latent heat ratio was found to be 0.61 at the desorption temperature of 308 K, whereas the highest latent effectiveness was obtained at the desorption temperature of 345 K. A suitable temperature for the effective and efficient dehumidification was observed to be 318 K for the current system. Full article
(This article belongs to the Special Issue Sciences and Innovations in Heat Pump/Refrigeration)
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15 pages, 2581 KiB  
Article
Research on Heat Transfer Performance of Micro-Channel Backplane Heat Pipe Air Conditioning System in Data Center
by Liping Zeng, Xing Liu, Quan Zhang, Jun Yi, Xianglong Liu and Huan Su
Appl. Sci. 2020, 10(2), 583; https://doi.org/10.3390/app10020583 - 13 Jan 2020
Cited by 3 | Viewed by 2107
Abstract
This paper deals with the heat transfer performance of a micro-channel backplane heat pipe air conditioning system. The optimal range of the filling rate of a micro-channel backplane heat pipe air conditioning system was determined in the range of 65–75%, almost free from [...] Read more.
This paper deals with the heat transfer performance of a micro-channel backplane heat pipe air conditioning system. The optimal range of the filling rate of a micro-channel backplane heat pipe air conditioning system was determined in the range of 65–75%, almost free from the interference of working conditions. Then, the influence of temperature and air volume flow rate on the heat exchange system were studied. The system maximum heat exchange is 7000–8000 W, and the temperature difference between the inlet and outlet of the evaporator and the condenser is almost 0 °C. Under the optimum refrigerant filling rate, the heat transfer of the micro-channel heat pipe backplane system is approximately linear with the temperature difference between the inlet air temperature of the evaporator and the cooling distribution unit (CDU) inlet water temperature in the range of 18–28 °C. The last part compares the heat transfer characteristics of two refrigerants at different filling rates. The heat transfer, pressure, and refrigerant temperature of R134a and R22 are the same with the change of filling rate, but the heat transfer of R134a is lower than that of R22. The results are of great significance for the operational control and practical application of a backplane heat pipe system. Full article
(This article belongs to the Special Issue Sciences and Innovations in Heat Pump/Refrigeration)
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