, Volume 17, Issue 2, pp 242-251
Date: 02 Dec 2011

Methodology for systematic analysis and improvement of manufacturing unit process life cycle inventory (UPLCI) CO2PE! initiative (cooperative effort on process emissions in manufacturing). Part 2: case studies

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Abstract

Purpose

This report presents two case studies, one for both the screening approach and the in-depth approach, demonstrating the application of the life cycle assessment-oriented methodology for systematic inventory analysis of the machine tool use phase of manufacturing unit processes, which has been developed in the framework of the CO2PE! collaborative research programme (CO2PE! 2011) and is described in part 1 of this paper (Kellens et al. 2011).

Screening approach

The screening approach, which provides a first insight into the unit process and results in a set of approximate LCI data, relies on representative industrial data and engineering calculations for energy use and material loss. This approach is illustrated by means of a case study of a drilling process.

In-depth approach

The in-depth approach, which leads to more accurate LCI data as well as the identification of potential for environmental improvements of the manufacturing unit processes, is subdivided into four modules, including a time study, a power consumption study, a consumables study and an emissions study, in which all relevant process in- and outputs are measured and analysed in detail. The procedure of this approach, together with the proposed CO2PE! template, is illustrated by means of a case study of a laser cutting process.

Results

The CO2PE! methodology aims to provide high-quality LCI data for the machine tool use phase of manufacturing unit processes, to be used in life cycle inventory databases and libraries, as well as to identify potential for environmental improvement based on the in-depth analysis of individual manufacturing unit processes. Two case studies illustrate the applicability of the methodology.

Responsible editor: Martin Baitz
Methodology for systematic analysis and improvement of manufacturing unit process life cycle inventory. Part 1: methodology description [Int J Life Cycle Assess doi:10.1007/s11367-011-0340-4]—Part 2: case studies [Int J Life Cycle Assess doi:10.1007/s11367-011-0352-0]
Preamble. The CO2PE! UPLCI– initiative aims to document and improve the environmental impact created during the use phase of a wide range of discrete part manufacturing processes. In addition to the first article, which describes the developed methodology comprising two approaches with different levels of detail, this paper provides for both approaches a case study of the Life Cycle Inventory step.