Studies on thermal performances of a new greenhouse cladding material

摘要

Thermal performances of a new bi-oriented corrugated rigid sheet of polyvinyl chloride (PVC) were studied by spectral measurements and dynamic simulations. Analysis of the data based on the experimental spectral values led to a first improvement bya 5% relative increase in the PAR transmittance. Further studies on thermal performances of the new PVC sheet with 4 other similar materials were performed using a dynamic energy balance model in both passive and active greenhouses over 6 months. The simulation results showed that an 'ideal' PVC sheet with low emittance in thermal infrared radiation would reduce the annual heat load by 21%.