GB/T 27720-2011 "Calculation Method for Energy Balance and Energy Efficiency of Kamyr Continuous Cooking System" specifies the calculation method for energy balance and the evaluation indicators for energy efficiency of the Kamyr continuous cooking system. It is applicable to pulp production lines that adopt the Kamyr continuous cooking process. The standard clearly defines the system boundaries, covering units such as the digester, chemical liquor preparation, and heat recovery. It standardizes the calculation details for energy inputs such as steam, electricity, and cooking liquor, as well as outputs such as energy carried by unbleached pulp and waste heat. It also establishes the method for calculating energy efficiency, providing guidance for energy-saving optimization of the cooking system.