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ISI POMPASI DESTEKLİ KURUTMA SİSTEMLERİNDE BY-PASS ORANININ KURUTMA PERFORMANSINA ETKİSİNİN DENEYSEL ANALİZİ

Experimental Analysis of the By-Pass Air Ratio Effect on the Drying Performance at the Heat Pump Assisted Dryer Systems

Journal Name:

  • Uludağ Üniversitesi Mühendislik-Mimarlık Fakültesi Dergisi

Publication Year:

  • 2012

Key Words:

Keywords (Original Language):

Author NameUniversity of AuthorFaculty of Author
Abstract (2. Language): 
In this study, a prototype, closed loop heat pump-assisted dryer (HPD) system with the refrigerant R134a was designed, and tested. The effects of by-pass air ratio (BAR) for two different air flow rates on the system’s performance were investigated. The system performances were evaluated in terms of the heat pump performance (COPhp), the performance of all systems (COPsys) and specific moisture extraction rate (SMER). The experimental results showed that bypassing the air more than 50% reduced the COP and SMER values. The COP and SMER values remained nearly constant up to the BAR of 50% and then sharply decreased. The maximum COPhp, COPsys and SMER values were obtained as 4.8, 3.2 and 3.5 kg/kWh, respectively. It was also observed that increasing the air flow rate did not improve the performance of the system. Because, the consumption of the fan was also high, so ITKsis affected negatively.
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Abstract (Original Language): 
Bu çalışmada R134a soğutucu akışkan kullanılan prototip bir kapalı sistem ısı pompası destekli kurutucu deney düzeneği tasarlandı ve test edildi. İki farklı hız için by-pass oranının sistem performansına etkisi incelendi. Sistem performansına etki eden parametreler, ısı pompası ısıtma tesir katsayısı (ITKıp), tüm sistemin ısıtma tesir katsayısı (ITKsis) ve özgül nem çekme oranı (SMER) hesaplandı. Deneysel sonuçlarda, by-pass oranı % 50’den fazla olduğu durumlarda ITK ve SMER değerlerinin azaldığı görüldü. ITK ve SMER değerleri yaklaşık % 50 by-pass oranına kadar arttığı ve daha sonra hızla azaldığı görüldü. Maksimum ITKıp, ITKsis, SMER değerleri yaklaşık olarak 4.8, 3.2 ve 3.5 kg/kWh olarak elde edildi. Ayrıca hava debisinin arttırılmasının sistem performansını iyileştirmediği gözlemlendi. Çünkü yüksek hava debilerinde fanın tükettiği güç değeri de fazla olduğundan dolayı ITKsis değeri olumsuz yönde etkilendi.
FULL TEXT (PDF): 
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  • 2
  • Turkish

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