Numerical model to estimate the radiometric performance of net covered structures.

摘要: The design of structures to support nets for agricultural applications is mostly empirical. radiometric behaviour a net covered structure strongly depends on the shape structure, postion sun and external light conditions performance itself (Castellano et al. 2006). Nets are three-dimensional objects, optical properties can be different angles incidence, may change depending condictions (clear / overcast sky). colour important plant growth (Oren-Shamir 2001). Transparent or semitransparent threads used high level inside green black reducing excessive solar radiation generate mild more uniform internal conditions. For these reasons, model developed analysing with nets. permeable cladding measured will in this estimating overall crop level. objectives use were: Estimating year-round interval level; Analysing during seasons times day; Developing simple method estimate relevant growth, that as tool producers growers. Introduction empirical so far. Until now investigations very limited. While air flow resistance kind insect some investigated by various research groups (Bailey al., 2003; Demrati 2001; Fatnassi 2002; Harmanto al.; 2005; Klose Tantau, 2004; Miguel , 1997; Miguel, 1998; Soni Teitel, 2007; Teitel 1996; Valera 2005), only little known about