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|Type:||Artigo de periódico|
|Title:||Indirect Airflow Distribution Measurement Method For Horticultural Crop Package Design|
De Castro L.R.
|Abstract:||Information about the air flow distribution inside a porous medium such as a container of horticultural produce is of high importance in the design of efficient handling and cooling systems. The objective of this research was to develop an airflow rate (AFR) measuring method that is more precise than a method previously developed and referred to as the Circular Approach Velocity (CAV) method, without modifying the airflow pattern. Instrumented balls used as produce simulators were calibrated to determine the correlations among their cooling rates (CR), cooling indexes (CI), air approach velocities, and AFRs. The applicability of the new method, referred to as the Square Cross Section Velocity (SCSV) method, using these instrumented balls as an indirect measurement method of air velocity was evaluated and compared to the CAV method. With the SCSV method, the relationships between the AFRs and the CRs were determined as a function of the position of the instrumented balls in reference to the air entrance. The two methods were evaluated by a comparison of the data obtained for three percentages of open area in packages (0.67, 2, and 6%) and six AFRs (ranging from 0.125 to 3.9 L s-1 kg-1 of produce), and the calculation of a mass balance. The comparison showed that the SCSV method was only slightly better at predicting variations in cooling rate than the CAV method, but was much better at predicting AFR than the CAV method. A statistical analysis was performed and demonstrated that only one replication of each of the six AFRs would have been sufficient to distinguish the effect of the AFR used on the cooling rate. However, three replications are required to discriminate between the significant effect of AFRs and the percentages of open area on the CR of individual produce products and the uniformity of the CR of a range of produce products across the porous medium.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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