In this work the design. fabrication and investigation of a solar biogas digester with built-in RAH (Reverse Absorber Heater) is presented. The maximum temperature (50 o C) inside of the methane tank was taken as a main parameter at the design of the digester. Using energy balance equation for the case of a static mass of fluid being heated; the parameters of thermal insulation of the... https://lockdownsecuritycanada.shop/product-category/lcd-screen/