Yazar "Wongwises, Somchai" seçeneğine göre listele

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    A model of energy management analysis, case study of a sugar factory in Turkey
    (Indian Academy Sciences, 2018) Taner, Tolga; Sivrioğlu, Mecit; Topal, Hüseyin; Dalkılıç, Ahmet Selim; Wongwises, Somchai
    This study presents a case study of energy management in a sugar factory in Turkey. The main idea of the study is to analyse energy consumption, the quantity of material production, and figure out a suitable energy efficiency for the case study of a sugar factory subsequently. Firstly, a material production and energy consumption audit were performed for the sugar factory. Secondly, energy efficiency was calculated from the energy data. The SPSS (Statistical Package for the Social Sciences) statistical software was used to ensure the accuracy of the data. The factory's energy consumption was calculated as 43,590.25 toe (tons of oil equivalent) over the last year. These results were used for CUSUM (Cumulative Sum Deviation Method) graphics. This research poses the consumption of energy, cost of energy and the relationship between energy usage and material production of sugar. The unit of energy cost was 688.22 [$/toe] for the last year. This result showed that the factory decreased the unit of energy by optimisation. The results indicated that the investigated sugar factory should pay attention to the energy management issue in order to comply with the Energy Efficiency of Turkish Law and Directives.
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    A review of flow boiling in mini and microchannel for enhanced geometries
    (Yildiz Technical University, 2018) Çebi, Alican; Çelen, Ali; Dönmez, Aydın Hacı; Karakoyun, Yakup; Celen, Pınar; Cellek, Mehmet Salih; Dalkılıç, Ahmet Selim; Taner, Tolga; Wongwises, Somchai
    Flow boiling researches in enhanced geometries practiced recently have been summarized in this review. Classical approximations in macroscale flows have not applied to the flows with small hydraulic diameters, so, this subject has been paid attention by the researchers. Application areas of these structures are increasing continuously due to cooling need in small confined spaces. The related studies have been reviewed in a chronological manner and their parameters have been given in a table in order for the researchers to observe the scientific duration regarding the progresses on this subject. Almost all papers on this subject have been produced after 2000, therefore, this subject is considered as an actual one to improve and worth to study in the literature. This study can not only be evaluated as the beginning argument for the researchers involved in flow boiling process in mini and microchannel, but it also consists of new works on the investigated subject.
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    CFD analyses on the thermal comfort conditions of a cooled room: A case study
    (Springer, 2022) Özsağıroğlu, Semih; Camcı, Muhammet; Taner, Tolga; Açıkgöz, Özgen; Dalkılıç, Ahmet Selim; Wongwises, Somchai
    This study examined a room with a surface of 1.8 x 1.8 x 2.85 (m) and a well-insulated floor (adiabatic condition) and examined the heat exchange from the side surfaces and ceiling. In this closed room, the heat transfer effects with radiation were investigated while bringing them to comfort conditions ranging from 30 (degrees C) air temperature to 20-24 (degrees C). A computer with a power of 25 (W) as a source of heat, a person with an average metabolic activity of 50-70 (W) and a table were found in this closed room. In this study, the cooling of the room from the floor, ceiling and air conditioner was inquired while the computer was running, in a closed area under the specified heat transfer conditions. As a scenario, the air exchange coefficient was modeled via Ansys Fluent, fed with air of 15 (degrees C) with 1, 3, 5, 10, 15 air. In addition, the comfort values of the human wrist (the distance of 0.1 m) and the shoulder (the distance of 1.1 m) were researched according to ASHRAE-55. The obtained results were analyzed as a comparison of ACH results, and the comfort parameter values were analyzed by reading the sections taken from the ankle shoulder level and velocity, temperature, values according to ANSI/ASHRAE-55. The relative humidity was 50% in the room, while the metabolic activity is 1.2 (met). These parameters corresponded to the sitting position; the clothing effect was found to be 0.67 (clo). The novelty of this study encourages the production of the ideal CFD analysis on the thermal comfort conditions of a cooled room, the task of engineering.