GB/T 27722-2011 "Calculation Method for Energy Balance and Energy Efficiency of Wood Pulp Preparation System" specifies the calculation method for energy balance and the evaluation indicators for energy efficiency of the wood pulp preparation system. It is applicable to the preparation section of wood pulp production (including units such as debarking, chipping, and screening). The standard clarifies the division of system boundaries, calculation details for energy income and expenditure items (such as fuel, electricity, energy carried by materials, etc.), and standardizes the energy efficiency calculation formulas and data statistics requirements. Through energy balance analysis, it quantifies the energy consumption at each stage, guiding energy-saving improvements in the preparation system.