Ventilation - Electrical Rooms PDF
Ventilation - Electrical Rooms PDF
Ventilation - Electrical Rooms PDF
Purpose
This document describes the main features of design and construction of ventilation and air
conditioning of electrical equipment rooms in industrial applications.
The purpose of this recommendation is to give the decision-makers an overview of the con-
struction process, and guidance to sources of more detailed information.
Introduction
There has been a lack of "common language" for the design, construction and operation of air-conditioning of
industrial electric-, electrotechnical- and control rooms. Requirements for the equipment and its environmental condi-
tions are presented in different standards and guidelines in such a way that many interpretations are possible. For
example, a given temperature limit can have been regarded by the end user as an absolute maximum, while the
equipment supplier could allow it to be exceeded (within another range) for a short period.
As a result of this,
-in some rooms the environment is too severe, resulting in operational errors and equipment failures, which really
can be worth more than the whole equipment
-some rooms are conditioned unnecessarily well in relation to the actual environmental requirements, resulting in
high investment costs, due to oversized (or unnecessarily double) air-conditioning equipment, or in high operation
costs.
EUROVENT/CECOMAF
EUROPEAN COMMITTEE OF
AIR HANDLING, AIR CONDITIONING AND REFRIGERATION
EQUIPMENT MANUFACTURERS
-to specify the design parameters clearly according to the
Project execution, critical stages IEC classification in order to select the most appropriate
air-conditioning system and equipment
The requirements of ventilation and air conditioning are
generally taken into account too late in the design process. -to arrange, by structural and ventilation measures, a
Also the design criteria for ventilation and air-conditioning proper overpressure in the equipment room, to prevent
can generally be interpreted in an ambiguous way, or they leakages of contaminated air from adjacent spaces
are too vaguely expressed. This can result in
Many other important factors have to be taken into ac-
---unsatisfactory climatic conditions in the equipment count aswell:
rooms, resulting in disturbances or even failures in produc- -environmental conditions
tion processes, or in -heat loads
-reliability if use of the equipment
---oversizing of the systems, resulting in uneconomical -space requirements
operation -fire protection
-future need of extension
Modern electrical equipment is sensitive to its environ- -life cycle costs
ment, and if the conditions of the equipment rooms are not
properly controlled, there is an obvious risk to even a
complete failure in the production process. Special questions in decision-making
How serious can a failure be? In a highly automated Legislation, standards, guidelines, recommendations
process a failure may cause losses in production many
times greater than the equipment itself. For example a In the ”bibliography” the common international references
breakdown of a paper machine can cost up to 30.000 € in are listed. In addition to this, national norms and standards
one hour. have to be taken into account.
...vs. target values required for the electrical To control indoor air parameters in the electrical equip-
equipment. ment room it is necessary to have positive pressure in the
room in relation to adjacent rooms. A suitable overpres-
For example, to fulfil the most stringent category for elec- sure is approximately 20 Pa.
trical equipment means automatically that the IAQ is suffi-
cient for a workplace, also the temperature is within the Selection of air-conditioning equipment
required range, but attention has to be paid also on air
velocity and noise level. Items to be considered:
1 2 3 4 5
3K1 - - - + +*)
3K2 - - - + +
3S1 - - + + +
3C1****) - - + + +
3C2*****) + + + + +
Bibliography
EN 50082-1 Electromagnetic compatibility (EMC) -
-International standards generic immunity standard, part 1: resi-
dential, commercial and light industry
ISO 9223. Corrosion of metals and alloys, Classifica-
tion of corrosivity and atmospheres, 1989. EN 50082-2 Electromagnetic compatibility (EMC) -
generic immunity standard, part 2: in-
IEC 68-1 Basic environmental testing procedures. dustrial environment
Part 1: General
- Other standards
IEC 721-2-8 Classification of environmental condi-
tions. Environmental conditions appearing ISA 571.04-85 Environmental conditions for process
in nature. Fire exposure. measurements and control systems: Airborne contami-
nants.
IEC 721-3-0 Classification of environmental condi-
tions. Introduction