Page 59 - Industrial Ventilation Design Guidebook

24 CHAPTER 3 DESIGN METHODOLOGY OF INDUSTRIAL AIR TECHNOLOGY
3.4 PROCESS DESCRIPTION

Understanding of the technological process and identification of subprocesses
are essential for proper ventilation design, especially when designing process
ventilation but also in enclosure air technology. The purpose of process de-
scription is to identify possible emission sources, occupational areas, the ef-
fects of environmental parameters on production, needs for enclosure and
ventilation equipment, etc. One purpose is to divide the process into parts
such that their inputs and outputs (e.g., process, piping and duct connections,
electricity, exposure) to environment can be defined. Parts here can be differ-
ent departments, and inside them, subprocesses. See Fig. 3.4.
Also, possible specific secondary sources of energy should be studied at
this stage.
Tools for this task could include databases and further expert systems,

3.5 BUILDING LAYOUT AND CONSTRUCTION

This task considers the effect of building and construction properties to in-
door environment. It requires the collection of properties of building layout,
construction, openings and their properties as basic values for load calcula-
tions. See Fig. 3.5.
The output of this task could, in addition to the list of properties, also in-
clude a more sophisticated building model, in which collected properties are
built in: infiltration model, thermal model, etc.
Tools for this task include:
• Architect designs
• Databases

3.6 TARGET LEVEL ASSESSMENT

This task consists of defining target levels for indoor and outdoor conditions
based on requirements for laws and regulations, human health, production
processes and equipment, and type of premises and construction. Target lev-
els should also be defined for the ventilation system. For the decision tree, see
Fig. 3.6.
Target levels are needed as a standard to which system solutions are com-
pared. During comparison it may become evident that target levels cannot be
achieved with any solution or that they lead to very expensive solutions. In
such cases target levels have to be reconsidered (back coupling).

Explanations of Fig. 3.6
Step I: Musts
Clarify requirements due to laws, regulations, standards related to legisla-
tion, processes, and equipment.