Heating of an agricultural greenhouse by a reservoir filled with rocks

Agricultural greenhouses are structures that produce fruits and legumes with high yields, in off-season and in places where the development of the plantation is difficult, this by creating a favorable microclimate for the good development of the plantation. heating is a necessity during winter periods, with the aim of increasing the temperature and decreasing the air humidity of the inside greenhouse. heating by solar energy is very promising compared to traditional systems using fossil fuels which are very expensive and polluting. in this work we have studied a simple and economical heating system of a greenhouse with a cylindrical pvc tank filled with rocks. the results of this study showed that the rock-bed system allowed to increase the nighttime temperature inside the greenhouse by 1-2 °c and to decrease the relative humidity of the greenhouse by 3% compared to the reference greenhouse.