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CSME 2023/12
Volume 44 No.6
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593-598
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Numerical Simulations of Air Flow inside Large Refrigeration Stores Onboard Marine Ships
Amr F. Sharafeldin a, Wael M. El-Maghlany a, Abdelhamid Attia a and Yehia A.Eldrainy b
aMechanical Engineering Department, Faculty of Engineering, Alexandria University, Alexandria – Egypt 21544, ROC.
bMechanical Engineering Department, Arab Academy for Science, Technology and Maritime Transport– Egypt 21913, ROC.
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Abstract:
This paper aims to develop and implement a static modeling for large refrigeration stores on board marine ships. It is required several numbers of moni-toring points for estimating average conditions of air quality in large stores. The simulation of temperature and relative humidity distribution inside the special stores enables the operators to predict temperature and relative humidity. Also it is an attempt to evaluate internal air quality of large refrigeration stores on board marine ships to keep internal air quality at such a condition of (1-4) ºC and (70-75) % relative humid-ity. These represent the optimum conditions for the storage of fresh fruits and vegetables. Controlling inlet air moisture content is accomplished according to the nature of transferred product. As for simulation modeling, different models were adopted and ex-panded by Ansys Fluent 17.2 program. Some simu-lated results were validated by measurements with good agreement where a case study was conducted in a large proofer in Cairo, Egypt. A number of different models on the entrance air speeds and flow rates in large refrigeration stores were introduced. Optimum sensor locations inside the large refrigeration store were selected according to simulation results. The results showed that in order to maintain optimum large refrigeration store conditions inlet air flow rates from 3.8 m³/s to5.2 m³/s. This air flow rate range with 20% fresh air admits acceptable internal air quality inside large refrigeration stores.
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Keywords: Numerical simulation, temperature and relative humidity distribution, special stores, marine ships, large refrigeration stores, vegetables fruit storing.
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©
2023
CSME , ISSN 0257-9731
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