Authorship：Lead author,　Last author,　Corresponding author   Language：Japanese   Publisher：The Japan Society of Mechanical Engineers  

The study aims at producing activated carbons from low-cost materials, such as agricultural and botanical waste, without using expensive chemicals. The activated carbons produced by low-cost methods would enhance the possibility of installing desiccant dehumidification in developing countries in hot and humid regions. In this paper, we report dehumidification capacity of activated carbons prepared from Japanese Acorn Nutshell under different preparation conditions based on the water adsorption isotherms. Firstly, the adsorption isotherm equations were generated based on the measured data. Then, the dehumidification capacity was predicted under several ambient air conditions.

DOI： 10.1299/jsmeenv.2020.30.412

CiNii Research

Language：English   Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Refrigerating and Air Conditioning Engineers  

<p>Nanotailored microporous silica represents one of the more recent artificially prepared advanced materials used in heat transformation and conservation field after silica gel and various zeolite and zeolite-like materials. In this work, we introduce experimental findings on the energy characteristics of water adsorption on nanotailored microporous silica with 1.5 % aluminium doping in the structure. The downscaled system in this work simulates actual working conditions in a controlled environment for both heating and cooling mode. The key properties of this material lie in the regeneration temperatures 60 to 80 ℃ and COP, which reaches values around 0.6 in case of cooling and 0.7 in case of heating. In absolute values at Δ<i>T</i> = 15 ℃, the system reaches storing capacities of about 90 Wh and 126 Wh per adsorbent kilogram in terms of cooling and heating potential energy, respectively. An important factor of kinetic influence on system performance is discussed on a basis of constant time experiment and time-dependent energy flow breakthrough analysis. Constraining factors are found to be in parallel through the driving force of the pressure swing as well as the heat transfer through the body of the adsorption bed.</p>

DOI： 10.11322/tjsrae.21-37DE_EM_OA

CiNii Research

Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.seta.2022.102141

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Scopus

Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.1080/14786451.2021.1924717

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Scopus

Language：English   Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Refrigerating and Air Conditioning Engineers  

<p>Water vapor adsorption on activated carbon (AC) for dehumidification purposes has gained much attention due to the abundance of benefits provided by AC. The working region limited in high water vapor relative pressure (<i>P/P0</i>) makes this material suitable only for removing water vapor at a highly humid region. In this study, ozone oxidation was conducted to introduce more oxygen-based functional groups on AC to attract more water molecules. Based on surface characterization results, ozone oxidation increases oxygen functional groups such as carboxylic on AC but decreases their pores. The more AC exposed to ozone, the more different properties could be observed. The increment of functional groups enhances the water vapor adsorption uptake at <i>P/P0</i> ≤ 0.6, shifting the water sorption into lower <i>P/P0</i>.</p>

DOI： 10.11322/tjsrae.21-36DE_EM_OA

CiNii Research

Language：English   Publishing type：Research paper (scientific journal)   Publisher：The Japan Society of Mechanical Engineers and The Heat Transfer Society of Japan  

<p>Renewable energy-based microgrid systems are widely being studied as electrification methods for rural communities in developing countries. Waste heat generated by the components of the microgrid systems, such as the biogas driven generators (BDG), presents the potential of utilizing the low-grade heat in a way that can contribute to the sustainability of such energy systems. From the points of view of affordability, local manufacturability, and applicability for agriculture, thermally driven pumps (TDP) may be attractive for coupling with such microgrid systems. Therefore, the current study has focused on the development of a new type of thermally driven pumping system as a potential waste heat utilization component for microgrid applications in rural areas. A liquid piston-type TDP concept without moving parts, except few valves, was developed and parametric experimental investigations were carried out. The performance and characteristics of the system were studied, which revealed that the proposed system has a superior performance compared to the literature. It was also found that the system performance strongly depends on the heat addition rate and delivery capacity of the system, which are suitable characteristics for the intended application. Hence, the experimental data were used to estimate whether the proposed system can pump enough water that needs to be supplied for the biogas production to supply a 10 kW BDG unit of a microgrid. It was found that 87 - 93% of the total pumped water (13 - 27 m³) would be available for agricultural and other purposes while only 6 - 13% would need to be fed to the biogas digester. Generally, the results seem to be promising, and yet there are potentials for the optimization and improvement of the proposed system, hence they have been pointed out.</p>

DOI： 10.1299/jtst.21-00323

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Scopus

Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.1007/s10973-022-11368-7

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Scopus

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Elsevier {BV}  

DOI： 10.1016/j.egyr.2021.09.003

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Scopus

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Elsevier {BV}  

DOI： 10.1016/j.ijrefrig.2021.08.012

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Scopus

Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.3390/app11052279

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Scopus

Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.ijrefrig.2020.12.005

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Scopus

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Elsevier {BV}  

DOI： 10.1016/j.egyr.2020.11.038

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Scopus

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：{MDPI} {AG}  

DOI： 10.3390/en13164247

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Scopus

Language：English   Publishing type：Doctoral thesis  

DOI： 10.15017/2534478

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.micromeso.2019.109644

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Scopus

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Springer Science and Business Media {LLC}  

DOI： 10.1007/s10450-019-00107-4

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Scopus

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：American Chemical Society ({ACS})  

DOI： 10.1021/acs.jced.8b00403

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Scopus

Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.18462/IIR.TPTPR.2017.0112

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Event date： 2019.10

Language：English   Presentation type：Oral presentation (general)  

Venue：Okinawa   Country：Japan  

Event date： 2019.10

Language：English   Presentation type：Oral presentation (general)  

Venue：Fukuoka   Country：Japan  

Event date： 2019.10

Language：English   Presentation type：Oral presentation (general)  

Venue：Hradok pri Jelsave   Country：Slovakia  

Event date： 2019.10

Language：English   Presentation type：Oral presentation (general)  

Venue：Kanazawa   Country：Japan  

Event date： 2019.5

Language：English   Presentation type：Oral presentation (general)  

Venue：Vemyslice   Country：Czech Republic  

Event date： 2018.11

Language：English   Presentation type：Oral presentation (general)  

Venue：Hradok pri Jelsave   Country：Slovakia  

Event date： 2018.11

Language：English   Presentation type：Oral presentation (general)  

Venue：Pusan   Country：Korea, Republic of  

Event date： 2018.10

Language：English   Presentation type：Oral presentation (general)  

Venue：Fukuoka   Country：Japan  

Event date： 2017.10

Language：English   Presentation type：Oral presentation (general)  

Venue：Fukuoka   Country：Japan  

Event date： 2017.8

Language：English   Presentation type：Oral presentation (general)  

Venue：Tokyo   Country：Japan  

Event date： 2017.5

Language：English   Presentation type：Oral presentation (general)  

Venue：Tokyo   Country：Japan  

Event date： 2017.4

Language：English   Presentation type：Oral presentation (general)  

Venue：Seol   Country：Korea, Republic of  

Event date： 2014.12

Language：English   Presentation type：Oral presentation (general)  

Venue：Brno   Country：Czech Republic  

Event date： 2014.10

Language：English   Presentation type：Oral presentation (general)  

Venue：Hrádok   Country：Slovakia  

Event date： 2013.5

Language：English   Presentation type：Oral presentation (general)  

Venue：Blansko   Country：Czech Republic  

Event date： 2012.10

Language：English   Presentation type：Oral presentation (general)  

Venue：Hrádok   Country：Slovakia  

Event date： 2012.5

Language：English   Presentation type：Oral presentation (general)  

Venue：Hrotovice   Country：Czech Republic