GB/T 40100-2021Life cycle assessment method for electric machine (English PDF)

3.5 Functional Unit

Functional unit is used as the benchmark unit to quantify the performance of the product system.

NOTE 1: if the life cycle assessment is for a certain product, then, the functional unit may also be a product unit.

NOTE 2: Definition 3.20 of GB/T 24040-2008 is modified.

3.6 System Boundary

System boundary is to determine which unit processes are part of the product system through a set of criteria. [Definition 3.32 of GB/T 24040-2008 is modified]

3.7 Cut-off Criteria

Cut-off criteria refer to the stipulation of whether the quantity of materials and energy flows related to the unit process or product system, or the degree of importance of environmental impact are excluded from the scope of the study. [GB/T 24040-2008, Definition 3.18]

3.8 Impact Category

Impact category refers to the classification of concerned environmental issues. The results of life cycle inventory analysis may be classified into it. [GB/T 24040-2008, Definition 3.39]

3.9 Reference Flow

Reference flow refers to the process output required to realize the function of a functional unit in a given product system. [GB/T 24044-2008, Definition 3.29]

3.10 Reference Product

Reference product refers to a product or product system provide by the manufacturer, simulated in the life cycle assessment, and capable of realizing the specified functional unit. [GB/T 37552-2019, Definition 3.13]

4.3.1.2.3 Requirements for maintenance

If applicable, the maintenance frequency of the product and the parts used for maintenance shall be stated, such as: bearings, seals and fasteners, etc.

4.3.1.3 End-of-life stage

The following processing links shall be considered for all elements of the product life cycle and recorded in the life cycle assessment report:

---Recycling of parts / materials (re-use, recycling);

---Disposal process of parts / materials (energy recovery and landfill, including secondary wastes generated during disposal).

4.3.2 Data unit

4.3.2 of GB/T 37552-2019 is applicable to this Standard.

4.3.3 Requirements for data collection

4.3.3 and 4.3.4 of GB/T 37552-2019 are applicable to this Standard. […]

4.3.4 Data quality assessment