Influence of a passive heating system that combines heat accumulators and thermal screen on the greenhouse microclimate

摘要

The Mediterranean horticulture currently uses low technology greenhouses, which means that the productive results are far from their potential due to the climatological characteristics of the area. During the periods when minimum air temperatures area limiting factor for yield of the horticultural crops under greenhouse, the heat accumulation by water filled NIR absorbing polyethylene sleeves have showed a positive effect. In this work the combination of this system with the use of thermal screen isevaluated. A positive effect of both installations has been observed which leads to an increase in nighttime air temperature higher than 3°C. A good linear relationship has been shown between the daily global radiation and the maximum increase in watertemperature in the heat accumulators. The sustainability of this alternative system for heating makes it interesting for its implementation in the Mediterranean greenhouse.