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    Determination of the relationship among air velocity, cooling efficiency and temperature decrease at a cellulose based evaporative cooling pad
    (Academic Journals, 2010) Dagtekin, Metin; Karaca, Cengiz; Sangun, Levent; Yildiz, Yilmaz
    The aim of this study is to determine the relationship between air velocity, cooling efficiency and decrease of the temperature of the air passing the pad, at a cellulose based evaporative cooling pad and to gain handy information for the persons working on this subject. In the study, cellulose based evaporative cooling pad (CELdek R 7060-15) was handled as material. As for the velocity of air passing through the pad 0.5, 1.0 and 2.0 ms(-1) values were selected. Based on the measurement results, cooling efficiency and provided decrease of the temperature of the air passing the pad, were calculated. As a result of the research, cooling activities calculated between 3 different air velocities were found significant in the statistical sense ( p < 0.01) for the measurement periods except II. measurement periods. As for the temperature decrease, the difference between other measurement periods except II. and III. measurement periods, were also found significant. The highest cooling activity and temperature decreases were reached at 0.5 and 1.0 ms(-1) air velocities. It can be said that according to statistical data, optimal air velocity for the Mediterranean climatic conditions should be between 0.5 and 1.0 ms(-1), among the selected air velocities.
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    EFFECT OF WATER FLOW RATE ON COOLING EFFECTIVENESS AND AIR TEMPERATURE CHANGE IN EVAPORATIVE COOLING PAD SYSTEMS
    (Gh Asachi Technical Univ Iasi, 2016) Karaca, Cengiz; Yildiz, Yilmaz; Dagtekin, Metin; Gumus, Zekai
    In this study, it was aimed to determine the relationship between the temperature decrease of the air passing through the pad and flow rate of pad wetting water for pad evaporative cooling. In the experiments, a commercially available cellulose based evaporative cooling pad (CELdek (R) 7060-15 pad) was used. Experiments were conducted at three different water flow rates (2 L min(-1) m(-2); 4 L min(-1) m(-2) and 6 L min(-1) m(-2)) and two different air velocities (1.0 m sec(-1) and 1.5 m sec(-1)). The temperature decrease of the air passing through the pad and cooling effectiveness values were lowest at water flow rate of 6 L min(-1) m(-2) while they were close to each other at 4 L min(-1) m(-2) and 2 L min(-1) m(-2) water flow rates. The relationship between water flow rate and the temperature decrease of the air passing through the pad was found to be statistically insignificant, while the relationship between water flow rate and cooling effectiveness was statistically significant (P<0.01). It was concluded that it is impossible to build a mathematical model between water flow rates and temperature decrease of the air passing through the pad. However, the most appropriate water flow rate for the experimental conditions was considered 4 L min(-1) m(-2).
  • Küçük Resim
    Öğe
    The effects of air velocity on the performance of pad evaporative cooling systems
    (Academic Journals, 2011) Dagtekin, Metin; Karaca, Cengiz; Yildiz, Yilmaz; Bascetincelik, Ali; Paydak, Omer
    The aim of this study is to determine the relationship that is found among the velocity of the air passing through the pad, the obtained decrease at the temperature of the air passing the pad and the cooling efficiency at the cellulose based evaporative cooling pad, and be of help to the people who designed and operate these systems. In this study, cellulose based evaporative cooling pad (CELdek (R)7060-15, Munters AB, Kista, Sweden) was used and the tests conducted were completed at 2 periods. Air velocities were determined as 0.5, 1.0 and 1.5 ms(-1) at the first period, and 0.75, 1.25 and 1.75 ms(-1) at the second period. The water flow rate at the air velocities, chosen for both periods, was selected as 4 Lmin(-1)m(-2). As a result of the research, it was determined that it was not possible to make a mathematical connection among velocities of the air passing through the pad, obtained decrease at the temperature of the air passing the pad and the cooling efficiency. However, it can be said that the most appropriate air velocity for the pad used in the test should be higher than 0.5 ms(-1) and lower than 1.5 ms(-1).