Environmental issues are being addressed more and more heavily in today’s and future society. Thus, it is natural that in industrial processes and in their design, environmental effects are also considered over the whole life cycle. The life cycle of the production process can be divided into four parts: design, construction, op­eration, and end of the process. Each part consists of different tasks. Design meth­odology is a part of the whole process from starting point to “grave.” The life

Industrial Ventilation Design Guidebook

Copyright © 2001 by Academic Press. All rights of reproduction in any form reserved.


Cycle of the production process is illustrated in Fig. 3.1. Also, in Table 3.1 short descriptions and lists of tools for different tasks are given. Some of the tools are already in use, even if some of them are still missing from the engineer’s tool case.

It is important to understand that the results of the design process are what mainly determine the ventilation system performance with all its conse­quences. Thus, it is necessary to build all the life cycle targets into plans. Jn or­der to ensure the transfer of these targets from the plan to the actual product, commissioning, operations, and maintenance plans should always be included in the design work. The value of proper design and commissioning will be paid back when process modifications are made during the operation period. One essential item in efforts toward optimal industrial ventilation is a com­mon understanding of the design: design methodology.

The design methodology is a description of a technical design process that covers the whole lifetime of the production process. Most decisions concern­ing industrial ventilation are made at the design stage, and are reflected in construction, operation, maintenance, service, etc.

1 Design



! | Design methodology

; Construction Construction management ~|

Evaluation of system, Phase I







Operating time


Regular checks


Evaluation of system, Phase II


Change in process — Assessment


End of the process | Demolition of system 1 Reuse of equipment | Waste handling I

FIGURE 3.1 Design methodology process.

The first and most important aim of design methodology is to produce, by systematic analysis, a description of the design procedure that is commonly accepted and used in every process in different markets. The idea is to make a description of the technical process of design; in other words, to answer two questions:

• What is to be made clear and done during the design procedure?

• In which order are the tasks to be done?

The design methodology does not take a position on who does this or that task. That is part of administrative or commercial flow, which varies in differ­ent parts of the world and even in different projects in one country.

Once described, the design methodology can be applied for several usages. The need of the design methodology description was identified at an early stage of the Design Guide Book project. As such, it serves as a clue for this book. As design methodology vigorously describes the connections and correlation of different tasks, it could also be utilized as a skeleton of computerized design tools, such as expert systems, and as a tool for systematic analyses. It can be, and already has been, applied in research projects in order to identify gaps in knowledge or by financiers when assessing the need for proposed research.