Energy saving by using an axial flow deep well pump: An application in the net frames in Lake Karacaören-2

Türkiye çok sayıdaki gölleri, baraj gölleri ve küçük gölleriyle balık ürünlerinin yetiştirilmesi için büyük birpotansiyele sahiptir. Baraj göllerindeki kafeslerde balık yetiştirilmesi çok yaygın ve ekonomik olarak umut vadedenbir uygulamadır. Balık yetiştirilmesinde belirli bir su sıcaklığı aralığı ve minimum çözünmüş oksijen seviyesi gibikriterlerin sağlanması gerekmektedir. Su sıcaklığı 17-20 ºC aralığında istenirken, çözünmüş oksijen miktarı 6-7 mg/Lnin altına düşmemelidir. Haziran – Eylül aylarındaki hava sıcaklık artışı su sıcaklığını kabul edilebilir sınırlarınüzerine çıkarmaktadır. Üreticiler bu aylarda gölün derinliklerindeki soğuk suyu yüzeye pompalamak için farklı tipteiçten yanmalı motor-pompa (ICE-P) sistemleri kullanmaktadırlar. Ancak bu yöntem ekonomik değildir. Buçalışmada, enerji tasarrufu için ICE-P sistemine alternatif olarak eksenel bir derin kuyu pompası önerilmiştir. Sistemitest etmek üzere Burdur’da Karacaören -2 gölünde 5x5x8 metre boyutlarında 40 adet kafes sistemi yerleştirilmiştir.Göl derinliklerindeki soğuk suyun yüzeye sirkülasyonunu sağlamak için 5.5 kW gücündeki dalgıç motorunun (DWM)çalıştırdığı, 300 m3 /h kapasite, 4m basma yüksekliğine sahip ve 2850 devir/dakika’da çalışan 10 adet eksenel akışlıdalgıç pompalar (AFDWPs) özel olarak tasarlanmış ve üretilmiştir. Su sirkülasyonunda;, klasik metodu kullanılanICE-P ile yeni önerilen AFDWP ile karşılaştırmak için, her iki pompanın (ICE/AFDWP) kurulumundan sonra, 8mderinliğindeki kafeste su kolonu boyunca ortalama su sıcaklıkları ölçülmüş ve enerji tüketimleri Haziran-Eylül ayları arasında karşılaştırılmıştır. AFDWP ve ICE-P sadece bu aylarda kullanılmıştır. Sonuçlar AFDWP kullanımıdurumunda enerji tüketiminin 90 MWh/yıl olduğunu diğer yandan ICE-P tarafından tüketilen enerjinin 1949MWh/yıl olduğunu göstermiştir. Sonuçta, klasik ICE-P yerine özel tasarlanmış AFDWP sisteminin kullanımıyla 40kafeste %95.3 (1906.8 MWh/yıl) bir enerji tasarrufu elde edilmiştir.

Eksenel akışlı bir dalgıç pompa kullanarak enerji tasarrufu: Karacaören-2 gölündeki ağ kafeslerinde bir uygulama

Turkey is home to a large number of lakes, dam lakes and small lakes which have a great potential forgrowing fishery products. Growing trout in net frame systems manufactured in dam lakes is very common andeconomically very promising application. For growing trout, certain conditions such as certain water temperaturerange and minimum dissolved oxygen (DO) level must be satisfied. The water temperature required should be at 17- 20 ºC to grow trout. Also, the amount of dissolved oxygen (DO) should never fall below 6-7 mg/L. As thetemperature rises during the months of June-September, water temperature rises above the acceptable limits to growtrout. Producers usually use different types of internal combustion engine-pump (ICE-P) systems to provide thecirculation of the colder water in the deeper parts of the lake to lake surface to grow trout in these months. But, thismethod is not economically feasible. In this study, as an alternative to ICE-P system, an axial flow deep well pumphas been proposed for energy saving purposes. To validate the feasibility of the system, total of 40 net frame systemseach has dimensions of 5x5x8 meters have been installed to grow trout in net frames in Lake Karacaören 2 in Burdur,Turkey. To grow trout in the hot seasons, it is necessary to circulate the colder water in the deeper parts of the lake tolake surface economically. For this aim, total of 10 an axial flow deep well pumps (AFDWPs) having a capacity of300 m3 /h, head of 4 m and running at 2850 rpm which is driven by 5.5 kW deep well motor (DWM) have beenspecially designed and manufactured. To compare the classical water circulation method with ICE-P and newlyproposed AFDWP, after every two pumps (ICE/AFDWP) are installed, mean water temperatures were measuredalong the water column in net frame with the depth of 8 meters and also energy consumptions have been comparedduring the months of June to September. AFDWP and ICE-P were used only in these months where the water has tobe circulated. According to the results energy consumption by using AFDWP was about 90 MWh/year, on the otherhand, energy consumed by ICE-P was about 1949 MWh/year during the months of June-September. As a result,significant energy saving of 95.3 % (1906.8 MWh/year) can be obtained by using proposed AFDWP instead of theclassical ICE-P during these months for total of 40 net frames.

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