重電・産業システム機器向け電子回路基板および主回路部品の温室効果ガス排出量の算定

抄録

Objective. Power and industry systems include Printed Circuit Board（PCB）and Main Power Component（MPC）such as power semiconductor device. The researcher of Life Cycle Inventory（LCI）often faces the difficulty in collection of the required data for PCB which is comprised of a large number of parts and MPC of special specification. To response this problem, JEMA LCA-WG for power and industry system（JEMA-WG）calculated the GHG and CO₂ emission of a power inverter unit which include PCB and MPC based on the JEM-TR 243 “Life cycle CO₂ emission assessment guidelines for power and industrial systems” by using the methodology of JEITA, the database of “Life Cycle Assessment Society of Japan（JLCA）”, and the LCI database（3EID）of Economic Input-Output Tables by National Institute for Environmental Studies. JEMA-WG also showed the GHG and CO₂ emission factor of PCB for power and industry systems from the LCI analysis of 6 PCBs of power inverter unit and plant control system.

Results and Discussion. From the results of LCI of power inverter unit, it is clear that PCB and MPC have high sensitivity of GHG and CO₂ emission. On the other hand, the impact of the PCB assembling process could be neglected. In the PCB which include active component, the GHG and CO₂ emission factor of PCB is 185g-CO₂eq/g and 150g-CO₂/g. In the PCB which include passive component, the GHG and CO₂ emission factor of PCB is 30g-CO₂eq/g and 25g-CO₂/g. JEMA-WG also indicates the formula to calculate the GHG and CO₂ emission factor by the layer number of PCB which include active component as a reference information.

Conclusions. JEMA-WG showed the necessity of the analysis of PCB and MPC of power and industry systems. The CO₂ emission factors of PCB were shown as helpful information for LCI researcher.