Analysis of the Airflow Characteristics of Greenhouse Screening Materials

✍ Scribed by A.F. Miguel; N.J. van de Braak; G.P.A. Bot

• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 272 KB
• Volume: 67
• Category: Article
• ISSN: 0021-8634
• DOI: 10.1006/jaer.1997.0157

✦ Synopsis

Experiments and analyses were conducted to examine the airflow characteristics of some currently employed greenhouse screens and the ability to predict airflow through them . Nine dif ferent thermal , shading and insect screens were tested and their airflow characteristics were defined , based on the Forchheimer equation , in terms of permeability and porosity . Further , an analysis was made of the ef fect on these characteristics of damage caused by handling of the screen materials . Experiments demonstrated that thermal screens have permeabilities close to 10 Ϫ 1 1 m 2 and some thermal screens , mainly woven sheet screens , can be damaged by handling , whereby the permeability is increased up to 3 и 5 times .