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  1. Article ; Online: Performance enhancement of a diffusion-type solar still: Wettability and flowability of condensation surface

    Lee, Ga-Ram / Park, Chang-Dae / Lim, Hyuneui / Cho, Sung-Hoon / Choi, Seok-Min / Lim, Byung-Ju

    Renewable Energy. 2023 June, v. 209 p.277-285

    2023  

    Abstract: Several studies have been conducted to enhance the production of solar stills. However, studies focusing on the augmentation of condensation are still insufficient compared with those focusing on production improvement by enhancing evaporation. This ... ...

    Abstract Several studies have been conducted to enhance the production of solar stills. However, studies focusing on the augmentation of condensation are still insufficient compared with those focusing on production improvement by enhancing evaporation. This study evaluates the effect of contact and sliding angles of condensation surfaces, which are criteria for determining wettability and flowability on the production of solar stills. Single-effect diffusion solar still was fabricated, and glass specimens with various wettability properties were prepared as condensation plates of the still to compare the performances. Experiments were performed by changing the condensation plates of the solar still. Meanwhile, the condensation process and droplet forms were observed as a function of wettability. The experimental results showed that the production rate increased by 45% with a decrease in the sliding angle; it also increased as the surface became superhydrophilic or superhydrophobic, but the sliding angle was a better indicator. Therefore, the material to be used for the condensation surface should be selected based on the sliding angle preferentially.
    Keywords droplets ; evaporation ; glass ; hydrophilicity ; hydrophobicity ; renewable energy sources ; solar still ; wettability ; Diffusion still ; Contact angle ; Sliding angle ; Condensation surface
    Language English
    Dates of publication 2023-06
    Size p. 277-285.
    Publishing place Elsevier Ltd
    Document type Article ; Online
    ZDB-ID 2001449-1
    ISSN 1879-0682 ; 0960-1481
    ISSN (online) 1879-0682
    ISSN 0960-1481
    DOI 10.1016/j.renene.2023.03.134
    Database NAL-Catalogue (AGRICOLA)

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  2. Article: Effects of wind loads on the solar panel array of a floating photovoltaic system – Experimental study and economic analysis

    Choi, Seok Min / Park, Chang-Dae / Cho, Sung-Hoon / Lim, Byung-Ju

    Energy. 2022 Oct. 01, v. 256

    2022  

    Abstract: Floating photovoltaic systems have been installed around the world as solar energy is powerful renewable energy source, but they can sink or overturn depending on harsh environmental conditions. Analyzing the wind load on a solar panel array is important ...

    Abstract Floating photovoltaic systems have been installed around the world as solar energy is powerful renewable energy source, but they can sink or overturn depending on harsh environmental conditions. Analyzing the wind load on a solar panel array is important for designing an appropriate supporting structure for floating photovoltaic systems. In this study, the local pressure distributions on a solar panel array were experimentally measured and economic analysis was conducted for reduced manufacturing cost. The results showed that the first and last rows of panels had the highest drag and lift coefficients because they were the first to encounter the wind. The drag and lift coefficients gradually decreased in subsequent rows because of the sheltering effect. When the wind flowed from the side, the leftmost and rightmost columns provided a sheltering effect, which reduced the drag and lift coefficients for the center of the solar panel array by 45%–86%. From these results, the middle regions of floating bodies could be changed to the lower-cost materials which showed the 19% reduced manufacturing costs for 2.5 MW system (20 × 30). If the size of the floating PV system increases further, many floating bodies could be changed to lower-cost materials which will be more economical.
    Keywords economic analysis ; energy ; solar collectors ; solar energy ; wind
    Language English
    Dates of publication 2022-1001
    Publishing place Elsevier Ltd
    Document type Article
    ZDB-ID 2019804-8
    ISSN 0360-5442 ; 0360-5442
    ISSN (online) 0360-5442
    ISSN 0360-5442
    DOI 10.1016/j.energy.2022.124649
    Database NAL-Catalogue (AGRICOLA)

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  3. Article: Statistical analysis of power generation of semi-transparent photovoltaic (STPV) for diversity in building envelope design: A mock-up test by azimuth and tilt angles

    Kwak, Younghoon / Mun, Sun-Hye / Park, Chang-Dae / Lee, Sang-Moon / Huh, Jung-Ho

    Renewable energy. 2022 Apr., v. 188

    2022  

    Abstract: Semi-transparent photovoltaics (STPVs) have received increasing attention as an energy-efficient building envelope that uses renewable energy. It is necessary to find the optimal combination of the azimuth angle and tilt angle to install the STPV and to ... ...

    Abstract Semi-transparent photovoltaics (STPVs) have received increasing attention as an energy-efficient building envelope that uses renewable energy. It is necessary to find the optimal combination of the azimuth angle and tilt angle to install the STPV and to secure high-power generation. However, various constraints limit the installation of STPVs at optimal angles. In other words, there may be a conflict between the building envelope design and STPV design depending on the circumstances, thereby limiting the design. Therefore, this study presents a statistical analysis of power generation with respect to angle to determine the possibilities in building envelope design. Two identical STPV modules each were installed at five azimuth and tilt angles (i.e., two STPV modules each on 25 sides), and the power generation for one year was measured. Then, 1392 h of data were sampled and a statistical analysis was conducted to compare the power generation. First, the representative values were set after comparing the power generation of the two modules at each angle through the Mann–Whitney test. Then, the power generation of each angle was compared through the Kruskal–Wallis test, and a post hoc analysis was conducted. As a result, power generation for five azimuth angles (e.g., +90° (west), +45° (southwest), 0° (south), −45° (southeast), and −90° (east)) was statistically identical in performance at tilt angles of 3° and 15°. Therefore, it is more desirable to focus designs on securing more area than considering optimal azimuth angle in the generation of maximum power through STPVs, at tilt angles of 3° and 15°. Moreover, STPVs for the tilt angles of 75° and 90° were statistically identical in performance when facing west, southwest, southeast, and east. This suggests that, when an STPV is installed at 75° or 90° of the tilt angle, if it cannot be installed on the south, it will provide statistically identical performance even if it is installed at any other azimuth angle. In light of these findings, this study concludes by providing guidelines for the application of STPVs in early architectural design.
    Keywords energy efficiency ; power generation ; solar energy ; statistical analysis
    Language English
    Dates of publication 2022-04
    Size p. 651-669.
    Publishing place Elsevier Ltd
    Document type Article
    ZDB-ID 2001449-1
    ISSN 1879-0682 ; 0960-1481
    ISSN (online) 1879-0682
    ISSN 0960-1481
    DOI 10.1016/j.renene.2022.02.048
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  4. Article: Robust and durable poly(aryl-co-aryl piperidinium) reinforced membranes for alkaline membrane fuel cells

    Hu, Chuan / Park, Jong Hyeong / Kim, Hae Min / Wang, Ho Hyun / Bae, Joon Yong / Liu, Mei-Ling / Kang, Na Yoon / Yoon, Kyoung-seok / Park, Chang-dae / Chen, Nanjun / Lee, Young Moo

    Journal of materials chemistry A. 2022 Mar. 22, v. 10, no. 12

    2022  

    Abstract: Robust and durable anion exchange membranes are crucial for cost-effective anion exchange membrane fuel cells (AEMFCs). Herein, we report high-performance poly(aryl-co-aryl piperidinium) (c-PAP) reinforced membranes with >95% visible light transmittance ... ...

    Abstract Robust and durable anion exchange membranes are crucial for cost-effective anion exchange membrane fuel cells (AEMFCs). Herein, we report high-performance poly(aryl-co-aryl piperidinium) (c-PAP) reinforced membranes with >95% visible light transmittance and a typical three-layer cross-sectional morphology for AEMFCs. Importantly, the reinforced composite membranes (RCMs) simultaneously possess ultrahigh tensile strength (TS, ∼114 MPa) and elongation at break (EB, ∼159%), which are improvements over the best-performing AEMs previously reported (mostly below 50 MPa of TS and 30% of EB). Additionally, the RCMs exhibit exceptional gas tightness (H₂ crossover current density <0.2 mA cm⁻² at 20% relative humidity (RH) and H₂ permeability <10 Barrer), dimensional stability, and mechanical durability during RH cycling and pressure differential tests at 80 °C. Moreover, the RCMs maintain excellent mechanical and chemical durability after AEMFC testing at a current density of 0.6 A cm⁻² at 70 °C for ∼360 h. The present RCM is an excellent candidate for alkaline energy device applications.
    Keywords anion-exchange membranes ; chemistry ; cost effectiveness ; dimensional stability ; durability ; energy ; light ; permeability ; relative humidity ; tensile strength ; transmittance
    Language English
    Dates of publication 2022-0322
    Size p. 6587-6595.
    Publishing place The Royal Society of Chemistry
    Document type Article
    ZDB-ID 2702232-8
    ISSN 2050-7496 ; 2050-7488
    ISSN (online) 2050-7496
    ISSN 2050-7488
    DOI 10.1039/d2ta00196a
    Database NAL-Catalogue (AGRICOLA)

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  5. Article: Experimental study of distiller with heat pipe utilizing waste heat from a portable electric generator

    Tanaka, Hiroshi / Park, Chang-Dae

    Desalination. 2012 Sept. 17, v. 302

    2012  

    Abstract: A seawater distiller utilizing the thermal energy of waste gas from a portable electric generator by means of heat pipe was constructed and tested with actual waste gas from a small portable electric generator. The distiller tested is a vertical single- ... ...

    Abstract A seawater distiller utilizing the thermal energy of waste gas from a portable electric generator by means of heat pipe was constructed and tested with actual waste gas from a small portable electric generator. The distiller tested is a vertical single-effect diffusion still, whose structure is equivalent to the first distilling cell of a vertical multiple-effect diffusion still, consisting of a series of closely spaced parallel partitions in contact with saline-soaked wicks. Evaporation and condensation processes were repeated on all partitions by recycling thermal energy to increase the distillate productivity in the still. All of the experiments were performed in steady-state conditions. Experimental results for the distillate productivity are in good agreement with theoretical predictions, and show that 40 to 50% of thermal energy of waste gas can be transported by heat pipe and about 35% of thermal energy of waste gas can be utilized for the distillation of saline water.
    Keywords condensation ; desalination ; distillation ; energy ; evaporation ; heat ; prediction ; recycling ; saline water ; seawater
    Language English
    Dates of publication 2012-0917
    Size p. 43-49.
    Publishing place Elsevier B.V.
    Document type Article
    ZDB-ID 2000800-4
    ISSN 0011-9164
    ISSN 0011-9164
    DOI 10.1016/j.desal.2012.06.019
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  6. Article: Experimental study of distiller with heat pipe utilizing waste heat from a portable electric generator

    Tanaka, Hiroshi / Park, Chang-Dae

    Desalination

    Volume v. 302

    Abstract: A seawater distiller utilizing the thermal energy of waste gas from a portable electric generator by means of heat pipe was constructed and tested with actual waste gas from a small portable electric generator. The distiller tested is a vertical single- ... ...

    Abstract A seawater distiller utilizing the thermal energy of waste gas from a portable electric generator by means of heat pipe was constructed and tested with actual waste gas from a small portable electric generator. The distiller tested is a vertical single-effect diffusion still, whose structure is equivalent to the first distilling cell of a vertical multiple-effect diffusion still, consisting of a series of closely spaced parallel partitions in contact with saline-soaked wicks. Evaporation and condensation processes were repeated on all partitions by recycling thermal energy to increase the distillate productivity in the still. All of the experiments were performed in steady-state conditions. Experimental results for the distillate productivity are in good agreement with theoretical predictions, and show that 40 to 50% of thermal energy of waste gas can be transported by heat pipe and about 35% of thermal energy of waste gas can be utilized for the distillation of saline water.
    Keywords distillation ; seawater ; evaporation ; saline water ; recycling ; condensation ; desalination ; prediction ; heat ; energy
    Language English
    Document type Article
    ISSN 0011-9164
    Database AGRIS - International Information System for the Agricultural Sciences and Technology

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