Outside diameter of  concentric sphere evaluator uses Outside Diameter = Heat Transfer/(Thermal Conductivity*pi*(Inside Temperature-Outside Temperature)*(Inside Diameter)/Length) to evaluate the Outside Diameter, The Outside diameter of  concentric sphere formula is defined as outside diameter of concentric sphere. Outside Diameter is denoted by Do symbol. 
 
 How to evaluate Outside diameter of  concentric sphere using this online evaluator? To use this online evaluator for Outside diameter of  concentric sphere, enter Heat Transfer (q), Thermal Conductivity (ke), Inside Temperature (ti), Outside Temperature (to), Inside Diameter (Di) & Length (L) and hit the calculate button.