Modelling solar energy input in greenhouses

摘要: A semi one-dimensional climate model was used to investigate the relative importance of constructional parameters that influence solar energy collecting efficiency greenhouses under Western European conditions. Parameters investigated were transmittance greenhouse frame, radiometric properties cladding and floor, as well type condensation (as a film or drops). Their effect on auxiliary heating requirements several fluxes in simulated for year-round tomato crop. The results pointed out catch about two thirds radiation available. This rather poor is due fact are fixed constructions, so their highly depends position geometry, which mainly determined by horticultural constraints. Most entering found be absorbed vegetation. Auxiliary hardly influenced changes frame transmittances, although reduction caused hemispherical drops 2.8% increase demand. floor characteristics had an impact demand amount available canopy, only small plants almost uncovered floor.