Numerical assessment of thermohydraulic performance of a deep freeze evaporator


Saricay T., ERBAY L. B.

ISI BILIMI VE TEKNIGI DERGISI-JOURNAL OF THERMAL SCIENCE AND TECHNOLOGY, cilt.28, sa.1, ss.33-41, 2008 (SCI İndekslerine Giren Dergi) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 28 Konu: 1
  • Basım Tarihi: 2008
  • Dergi Adı: ISI BILIMI VE TEKNIGI DERGISI-JOURNAL OF THERMAL SCIENCE AND TECHNOLOGY
  • Sayfa Sayıları: ss.33-41

Özet

Refrigerators have become indispensable for domestic and industrial purposes, with the improvement in the standard of living and manufacturing. A well-designed refrigerator provides low energy consumption and noise, have low price and large capacity of storage. Improving of the evaporator heat transfer performance is one of the most important ways for reducing the energy consumption. Therefore, this study performs determination of the influences of the fin spacing and air velocity on heat transfer coefficient, cooling capacity and pressure drop of airside of the evaporator in order to improve the energy efficiency of refrigerator. The evaporator is modeled numerically and several simulations have been done to find airside thermohydraulic performance. The airflow is assumed to be incompressible, Newtonian and laminar under the constant wall temperature boundary conditions on external surfaces of the evaporator pipes. From the numerical results, when the fin spacing is increased, the airside heat transfer coefficient is increased but heat transfer is decreased because of less total area. It has been found that as the air inlet velocity increases the heat transfer coefficient increases. The distance between fins of the evaporator is found to have considerable effect on pressure drop. The fin spacing is decreased pressure drop is increased. For provide the required cooling capacity, the most suitable fin spacing is found as 5 mm at velocity of 0,5 m/s.