A study on optimum circulation period of products for minimizing lifecycle energy consumption

Yuji Mizuno*, Naoya Kintoki, Yusuke Kishita, Shinichi Fukushige, Yasushi Umeda

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

2 Citations (Scopus)


Combination of long product lifetime and recycling is effective for reducing material use. However, in the case of products that uses energy in their use phase, early replacement of old products with new energy efficient products may contribute to reduction of lifecycle CO2 emission. In the previous studies, we proposed a formula to calculate optimum circulation period (OCP) of the products based on the improvement of energy efficiency. The formula was applied to the products produced in 1991-2000. This paper calculates the OCP of the latest products and analyzes the effect of rapid circulation of products. As a result, OCP and RCP effects are different from the previous studies, because characteristics of latest products are different from products of 1991-2000. Especially, OCP of Hybrid Electric Vehicles excesses three times than the normal product life span. Special case of rapid circulation between different type products, such as Gasoline Vehicles and Hybrid Electric Vehicles was effective for CO2 emission reduction.

Original languageEnglish
Pages (from-to)597-602
Number of pages6
JournalProcedia CIRP
Publication statusPublished - 2015
Externally publishedYes
Event22nd CIRP Conference on Life Cycle Engineering, LCE 2015 - Sydney, Australia
Duration: 2015 Apr 72015 Apr 9


  • Optimum circulation period
  • Product circulation
  • Product life cycle
  • Rapid circulation of products
  • Sustainable consumption

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Industrial and Manufacturing Engineering


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