Thanks dear Mahesh for your answer. Can we used brisk in inner area of greenhouse for play double role. Store heat in day and insolute greenhouse at night.
A brick wall, I think it's not a good idea. it is better then to use a wall of glass, or double glazing to increase the insulation. The double glazing traps the temperature in the greenhouse during the night. It is a bit expensive but beter than a brick wall.
Thank you very much for your interest of my work and for your answer. I chose brick because it's abale and no expansive in our country... your idea is so good .