مرکز منطقه ای اطلاع رساني علوم و فناوري - Estimation of air distrubition due to different blade angles of vents computational fluiddynamics in a cold store

Abstract :

In this research, the angle of the blades assumed to be 0º-0º-0º (Scenario 1), 0º-0º-45º (Scenario 2) and 0º-22.5º-45º (Scenario 3) for pressure and vacuum vents in an experimental cold storage fully loadedwith apple were used, and distrubutions in ambient temperature, air velocity and relative humidity weremodelled by using computational fluid dynamics (CFD) methods. Data determined from CFD Models were used to compare the effect of different blade angle scenarios on spatial ambient temperatures inthe storage. Spatial ambient temperatures varied between 1.85 ºC and 2.01 ºC for Scenario 1 (0º-0º-0º) whereas they were 1.85 ºC and 1.95 ºC for Scenario 2 (0º-0º-45º) and Scenario 3 (0º-22.5º-45º). Boundary conditions for modelling air velocity were accepted between 1.525 m/s and 3.99 m/saccording to the determined scenarios. Air velocity data determined using CFD models for 3 scenariosvaried between 0.03 and 0.12 m/s. Boundary condition of relative humidity for CFD modelling assumedto be 88%. Relative humidity model data determined from the middle plane of the cold storage changedbetween 87% and 88% for all blade angles. According to the CFD results, the values of Scenario 2 (0º-0º-45º) and Scenario 3 (0º-22.5º-45º) were found to be close to the required value for a apple coldstorage. According to the results of this study regarding the effect of different blade angles of vents onambient factors changing in an experimental cold storage, the blade angles in Scenario 2 (0º-0º-45º) and Scenario 3 (0º-22.5º-45º) were suggested because their results were more close to the required ambienttemperature, air velocity and relative humidity values for apple storage than Scenario 1 (0º-0º-0º).