Studying Effects of Using NIR Reflector and Heat Collector in the Solar Greenhouses on the Greenhouse Heating and Blocking Pests Way into Greenhouse

In the solar greenhouses, natural ventilation is used to repel the unnecessary heat by opening the windows. This regular action is led to enter diverse of pest and insects to the greenhouse and consequence production damages. In the presented work, a novel case of solar greenhouses is simulated and represented. This design uses a special cover on the roof that reflects NIR and avoids greenhouse warming too much, in the hot seasons. With no more heat, the ventilation needs get less and the pests damages will be prevented. In this work, NIR reflected by the cover placed on the circular roof of the greenhouse is focused in the collector equipped in the focal line of the roof. The collector contains water and PCM that makes it possible to store huge amount of energy in a limited space. Considering energy received in a typical summer day, the optimum quantities for minimum collector radius versus maximum PCM volume is computed. Numerical investigation on this design is performed in three different geometries and results are reported as temperature contours and stream functions. In addition, energy stored in every three cases is calculated and compared with greenhouse heating load. The results shows that annual greenhouse heating load can be provided by energy stored in this system and prevents the bothersome insects at the same time.