Research Paper Establishing the conveying parameters required for the air-seeders Andrii Yatskul a,* , Jean-Pierre Lemiere b a Chaire Agro-Machinisme et Nouvelles Technologies, UniLaSalle, 19 rue Pierre Waguet, 60000 Beauvais, France b UMR PAM, Agrosup Dijon, 26 boulevard Docteur Petitjean, BP 87999, 21079 Dijon Cedex, France article info Article history: Received 16 June 2017 Received in revised form 25 October 2017 Accepted 2 November 2017 Keywords: Air-seeder Stagnation velocity Conveying velocity Flow concentration Outlet pipe diameter Air-delivery system Correct energy management offers the best possibility for reducing the costs in agricultural production. In present day farming energy and agronomic efficiencies are both important factors. As the working-width of implements has increased, air-seeding is the best solution for the sowing of cereal crops. One of the problematic areas is the design of the air-delivery system, particularly if the pneumatic conveying system is wrongly dimensioned. The flow of seeding material during conveying must be high and regular enough for a high-speed seeding. There are three parameters that ensure the conveying of seeding material in a pipe: air velocity, flow concentration and pipe diameter. It is demonstrated that the outlets of the divider heads are the most critical part of the conveying system. Outlet pipes rela- tively small diameters and must allow for the highest seeding rates without clogging. It was hypothesised that the air velocity in outlet pipe may be used as an input data for designed a completed conveying system. This paper determines I) a minimal air velocity and flow concentration per type of seeds relative to pipe diameter; II) establishes a method to measure the air velocity of the loaded flow, which could be used to optimise existing seeders from an energy point of view; III) describes a global design methodology for air- seeder conveying systems; IV) reports an comparative study of energy of the most commonly used outlet pipe diameters within the air-seeders; V) describes a method for calculating the energy consumption evaluation; VI) prescribes the optimum outlet pipe diameter deduced from our experimental results, necessary for the design of the following divider heads. Tests were carried out using for wheat and barley seeds, starter fertilisers and a wheatefertiliser mixture, for three currently used pipe diameters (20, 25 and 30 mm). © 2017 IAgrE. Published by Elsevier Ltd. All rights reserved. 1. Introduction The key component for designers of pneumatic seed drills is the design of the pneumatic conveying system. It must be precise in terms of uniformity in order to achieve the overall agro-technical objectives. It must also allow high flows without causing damage to the seeds. Air-seeders have been commercially available for almost 50 years (Memory & Atkins, 1990; Weiste, 2013, p. 224). Today air-seeding is a key-tool on the wide-width machines and is * Corresponding author. E-mail address: andr.jat@mail.ru (A. Yatskul). Available online at www.sciencedirect.com ScienceDirect journal homepage: www.elsevier.com/locate/issn/15375110 biosystems engineering 166 (2018) 1 e12 https://doi.org/10.1016/j.biosystemseng.2017.11.001 1537-5110/© 2017 IAgrE. Published by Elsevier Ltd. All rights reserved.