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Sensors 2018, 18(2), 576; https://doi.org/10.3390/s18020576

Measuring Device for Air Speed in Macroporous Media and Its Application Inside Apple Storage Bins

1
Department Horticultural Engineering, Leibniz Institute for Agricultural Engineering and Bioeconomy (ATB), Max-Eyth-Allee 100, 14469 Potsdam, Germany
2
Department Postharvest Technology, Leibniz Institute for Agricultural Engineering and Bioeconomy (ATB), Max-Eyth-Allee 100, 14469 Potsdam, Germany
3
Competence Centre for Fruit Growing—Lake Constance, Ravensburg, Germany; University of Hohenheim, Institute of Crop Sciences, Section Crop Physiology of Specialty Crops, 70593 Stuttgart, Germany
4
Institute for Microsensors, -Actuators and -Systems (IMSAS), University Bremen, Otto-Hahn-Allee NW1, 28359 Bremen, Germany
*
Author to whom correspondence should be addressed.
Received: 30 November 2017 / Revised: 29 January 2018 / Accepted: 9 February 2018 / Published: 13 February 2018
(This article belongs to the Special Issue State-of-the-Art Sensors Technology in Germany)
Full-Text   |   PDF [5689 KB, uploaded 13 February 2018]   |  

Abstract

In cold storage facilities of fruit and vegetables, airflow is necessary for heat removal. The design of storage facilities influences the air speed in the surrounding of the product. Therefore, knowledge about airflow next to the product is important to plan the layout of cold stores adapted to the requirements of the products. A new sensing device (ASL, Air speed logger) is developed for omnidirectional measurement of air speed between fruit or vegetables inside storage bins or in bulk. It consists of four interconnected plastic spheres with 80 mm diameter each, adapted to the size of apple fruit. In the free space between the spheres, silicon diodes are fixed for the airflow measurement based on a calorimetric principle. Battery and data logger are mounted inside the spheres. The device is calibrated in a wind tunnel in a measuring range of 0–1.3 m/s. Air speed measurements in fruit bulks on laboratory scale and in an industrial fruit store show air speeds in gaps between fruit with high stability at different airflow levels. Several devices can be placed between stored products for determination of the air speed distribution inside bulks or bin stacks in a storage room. View Full-Text
Keywords: air speed logger; air velocity; calorimetric principle; fruit; vegetable; storage; produce bulk; cold store air speed logger; air velocity; calorimetric principle; fruit; vegetable; storage; produce bulk; cold store
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Geyer, M.; Praeger, U.; Truppel, I.; Scaar, H.; Neuwald, D.A.; Jedermann, R.; Gottschalk, K. Measuring Device for Air Speed in Macroporous Media and Its Application Inside Apple Storage Bins. Sensors 2018, 18, 576.

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