Determination of Shape Factor of Fixed Dome and Spherical Shape of Biogas Digester by Method of Thermal Simulation

Thermal model of bio gas digester is required to evaluate the performance of bio gas digester with different meteorological parameters, model includes the heat transfer due to conduction from surrounding ground to the bio gas digester. Method of thermal simulation as developed by Sodha et al. [10, 11] is used in present work to determine shape factors of two different types of bio gas digesters fixed dome type of bio gas digester and spherical type of biogas digester. Basis of the method is to determine shape factor of underground structure (fully or partially) by conducting small scale laboratory experiments on reduced scale models of underground structures.