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State-of-the-Art Energy Science and Technology in China

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Special Issue Editor

Dr. Rui Long

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Guest Editor

School of Energy and Power Engineering, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan 430074, China
Interests: nanofluidics; reverse electrodialysis; thermodynamics; heat transfer; novel heat-to-electricity systems

Special Issue Information

Dear Colleagues,

I would like to invite you to submit your work to a Special Issue on “State-of-the-Art Energy Science and Technology in China”. Energy Science and technology is one of the most important topics for the sustainable development of human beings. Most of the world’s energy supply originates from fossil energy combustion, which has induced severe climate and environmental issues. As such, there is an urgent need to improve the energy efficiency of traditional energy devices and develop high-performance energy conversion materials and devices as well as achieve energy system optimization and energy storage application. Relevant studies and advances in China significantly contribute to the world’s development of energy science and technology. This Special Issue aims to present new ideas and technologies, theory and simulation analysis, and experimental and practical applications in the field of energy science and technology in China. The topics of interest include but are not limited to performance improvement of traditional energy utilization and conversion technologies, alternative energy conversion science and technologies, energy storage science and technologies, energy system construction and optimization technologies, etc.

Dr. Rui Long
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

energy storage
energy conversion
energy efficiency
performance improvement of energy devices
energy system modeling and optimization
renewable energy
energy materials
CFD simulation
theory, molecular dynamics simulation, and first-principles calculations

Published Papers (2 papers)

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Research

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15 pages, 2009 KiB

Open AccessArticle

Performance Analysis of Two Systems Combining Heat Pump and Water Vapor Compression for Waste Heat Recovery

by Chunwei Zhang, Dongdong Chai, Xi Pan, Junlong Xie and Jianye Chen

Appl. Sci. 2022, 12(24), 12853; https://doi.org/10.3390/app122412853 - 14 Dec 2022

Cited by 3 | Viewed by 1317

Abstract

In the area of the heating industry, a heat pump is an efficient alternative technology to achieve energy saving and carbon emission reduction. The conventional heat pump has gradually been applied to replace the traditional direct electrical heating method while the required temperature is below 100 °C. A heat pump with temperatures between 100–140 °C is in the stage of rapid development. However, a heat pump with temperatures above 150 °C has received relatively little attention. In this paper, two systems combining a heat pump and water vapor compression (CHPVC and HPTVC) have been studied for waste heat recovery from 45 °C to a water vapor supply with a temperature above 150 °C. A thermodynamic model has been proposed to analyze the performance of the two systems, and a twin-screw compressor model has been developed to calculate the isentropic efficiency of the compressor applied in the heat pump. Four different parameters have been used to analyze the energy efficiency. The simulation results show that while the inlet water temperature is 45 °C and the required vapor temperature is 150 °C, the optimal COPs of CHPVC and HPTVC are 2.432 and 2.436, respectively. Moreover, CHPVC is more suitable for the large saturation temperature lift, and HPTVC is more suitable for a relatively small temperature difference between the inlet water and the required vapor. Compared with the direct electrical heating method or the conventional two-stage heat pump, these two systems are remarkably efficient and show good energy-saving potential. Full article

(This article belongs to the Special Issue State-of-the-Art Energy Science and Technology in China)

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Review

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32 pages, 6708 KiB

Open AccessFeature PaperReview

Prediction Models of Saturated Vapor Pressure, Saturated Density, Surface Tension, Viscosity and Thermal Conductivity of Electronic Fluoride Liquids in Two-Phase Liquid Immersion Cooling Systems: A Comprehensive Review

by Xilei Wu, Jiongliang Huang, Yuan Zhuang, Ying Liu, Jialiang Yang, Hongsheng Ouyang and Xiaohong Han

Appl. Sci. 2023, 13(7), 4200; https://doi.org/10.3390/app13074200 - 26 Mar 2023

Cited by 2 | Viewed by 2087

Abstract

As the carriers of massive data, data centers are constantly needed to process and calculate all kinds of information from various fields and have become an important infrastructure for the convenience of human life. Data centers are booming around the world, accompanied by the problems of high power consumption and poor heat dissipation. One of the most effective solutions to these problems is to adapt a two-phase liquid immersion cooling technology, which is a more energy-saving and efficient method than the traditional cooling methods; the reason for this is mainly that in two-phase liquid immersion cooling technology, the heat transfer caused by the phase change of liquid coolants (electronic fluoride liquids) helps to cool and improve the temperature uniformity of electronic components. However, the requirements for the electronic fluoride liquids used in two-phase liquid immersion cooling systems are strict. The thermophysical properties (saturated vapor pressure, density, surface tension, viscosity, thermal conductivity and latent heat of vaporization, etc.) of the liquid coolants play a very key role in the heat dissipation capacity of two-phase liquid immersion cooling systems. However, it is not always easy to obtain new electronic fluoride liquids under many actual conditions and reasonable prediction models of their thermophysical properties could contribute to the preliminary screening of the coolants. Thus, the prediction models of their key thermophysical properties (saturated vapor pressure, saturation density, surface tension, viscosity and thermal conductivity) are reviewed, and the accuracy and practicality of these prediction models in predicting the thermophysical properties of electronic fluoride liquids (FC-72, HFE-7100 and Novec 649) are evaluated. This work will provide a valuable reference for actual engineering applications. Full article

(This article belongs to the Special Issue State-of-the-Art Energy Science and Technology in China)

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