ETSI ES 203 156 V1.2.1 (2014-08)

Environmental Engineering (EE); Thermal Management requirements for outdoor enclosures

RES/EE-0159

General Information

• Status: Published
• Publication Date: 21-Aug-2014
• Technical Committee: EE 1 - EE Environmental Conditions
• Current Stage: 12 - Completion
• Due Date: 02-Sep-2014
• Completion Date: 22-Aug-2014
• Mandate: M/462

Standards Content (Sample)

ETSI ES 203 156 V1.2.1 (2014-08)






ETSI STANDARD
Environmental Engineering (EE);
Thermal Management requirements for outdoor enclosures

---------------------- Page: 1 ----------------------
2 ETSI ES 203 156 V1.2.1 (2014-08)



Reference
RES/EE-0159
Keywords
air flow, cooling capacity, environment,
management, outdoor enclosure, thermal
ETSI
650 Route des Lucioles
F-06921 Sophia Antipolis Cedex - FRANCE

Tel.: [phone]  Fax: [phone]

Siret N° 348 623 562 00017 - NAF 742 C
Association à but non lucratif enregistrée à la
Sous-Préfecture de Grasse (06) N° 7803/88

Important notice
The present document can be downloaded from:
http://www.etsi.org
The present document may be made available in electronic versions and/or in print. The content of any electronic and/or
print versions of the present document shall not be modified without the prior written authorization of ETSI. In case of any
existing or perceived difference in contents between such versions and/or in print, the only prevailing document is the
print of the Portable Document Format (PDF) version kept on a specific network drive within ETSI Secretariat.
Users of the present document should be aware that the document may be subject to revision or change of status.
Information on the current status of this and other ETSI documents is available at
http://portal.etsi.org/tb/status/status.asp
If you find errors in the present document, please send your comment to one of the following services:
http://portal.etsi.org/chaircor/ETSI_support.asp
Copyright Notification
No part may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying
and microfilm except as authorized by written permission of ETSI.
The content of the PDF version shall not be modified without the written authorization of ETSI.
The copyright and the foregoing restriction extend to reproduction in all media.

© European Telecommunications Standards Institute 2014.
All rights reserved.

TM TM TM
DECT , PLUGTESTS , UMTS and the ETSI logo are Trade Marks of ETSI registered for the benefit of its Members.
TM
3GPP and LTE™ are Trade Marks of ETSI registered for the benefit of its Members and
of the 3GPP Organizational Partners.
GSM® and the GSM logo are Trade Marks registered and owned by the GSM Association.
ETSI

---------------------- Page: 2 ----------------------
3 ETSI ES 203 156 V1.2.1 (2014-08)
Contents
Intellectual Property Rights . 5
Foreword . 5
Modal verbs terminology . 5
Introduction . 5
1 Scope . 6
2 References . 6
2.1 Normative references . 6
2.2 Informative references . 6
3 Definitions, symbols and abbreviations . 7
3.1 Definitions . 7
3.2 Symbols . 8
3.3 Abbreviations . 8
4 General requirements . 8
4.1 Thermal performance of outdoor enclosures . 8
4.2 Environmental class requirements for equipment installed in outdoor enclosures . 8
4.2.1 Free cooling cabinet . 8
4.2.2 Heat exchanger cabinet . 8
4.2.3 Air conditioning cabinet . 9
5 Thermal management . 9
5.1 Standardized definition of cooling capacity . 9
5.2 Maximum acceptable delta T . 10
5.3 The preferable rule for air flow . 10
5.3.1 Air flow paths of outdoor enclosures . 10
5.3.2 Preferable rule for air flow path match . 11
5.3.2.1 Door-mounted TCU . 11
5.3.2.2 Roof -mounted TCU . 12
5.3.2.3 Side-mounted TCU . 13
Annex A (normative): Thermal characterization data of outdoor enclosures to be provided
by the manufacturer . 14
A.1 General identification . 14
A.1.1 Identification . 14
A.1.2 Physical geometry . 14
A.2 Additional data for outdoor enclosures . 14
A.2.1 Mechanical characteristics of outdoor enclosures . 15
A.2.2 Fan/Fan tray. 15
A.2.3 Air filter of outdoor enclosures . 15
A.2.4 Airflow paths . 16
A.2.5 Cooling capacity . 16
Annex B (informative): Ambient temperature measurement point . 17
B.1 measurement point requirement . 17
Annex C (informative): Solar radiation. 18
Annex D (informative): Requirements for safety and EMC . 19
D.1 Requirements for safety. 19
D.2 Requirements for EMC . 19
D.3 Acoustic Noise Level requirement . 19
ETSI

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4 ETSI ES 203 156 V1.2.1 (2014-08)
Annex E (informative): Cabinet performance parameters . 20
Annex F (informative): Bibliography . 21
History . 22

ETSI

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5 ETSI ES 203 156 V1.2.1 (2014-08)
Intellectual Property Rights
IPRs essential or potentially essential to the present document may have been declared to ETSI. The information
pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found
in ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in
respect of ETSI standards", which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web
server (http://ipr.etsi.org).
Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee
can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web
server) which are, or may be, or may become, essential to the present document.
Foreword
This ETSI Standard (ES) has been produced by ETSI Technical Committee Environmental Engineering (EE).
Modal verbs terminology
In the present document "shall", "shall not", "should", "should not", "may", "may not", "need", "need not", "will",
"will not", "can" and "cannot" are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms
for the expression of provisions).
"must" and "must not" are NOT allowed in ETSI deliverables except when used in direct citation.
Introduction
Outdoor enclosure suppliers are trying to overcome their thermal issues in different solutions being developed. When
different equipments and outdoor enclosures from various suppliers are integrated, they can have a detrimental effect on
each other. The present document specifies the thermal management requirements for outdoor enclosures (defined in
EN 301 169-1 [i.4] and EN 301 169-2 [i.5]) to prevent outdoor enclosures having a detrimental thermal influence on
equipments inside.
ETSI

---------------------- Page: 5 ----------------------
6 ETSI ES 203 156 V1.2.1 (2014-08)
1 Scope
The present document describes the thermal management requirements for outdoor enclosures defined in
EN 301 169-1 [i.4] and EN 301 169-2 [i.5]. These thermal management requirements to be defined include:
• a standardized definition of cooling capacity for outdoor enclosures;
• a maximum acceptable delta T between ambient temperature and inside temperature;
• the preferable rule for air flow inside outdoor enclosures;
• the environment class for telecommunication equipment of wireline and wireless access network to be
installed in outdoor enclosures.
Not all these requirement are applicable to outdoor enclosures defined in EN 301 169-1 [i.4] and EN 301 169-2 [i.5];
maximum acceptable delta T for equipment in line with EN 301 169-1 [i.4] should be considered as a guide to
developer.
The purpose of the present document is to make it more easy to define the responsibility of equipment manufacturers,
cabinet manufacturers and integrators.
EMC, safety and acoustic noise requirements are not parts of the present document. Guidance on these aspects are
contained in annex D.
2 References
References are either specific (identified by date of publication and/or edition number or version number) or
non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the
reference document (including any amendments) applies.
Referenced documents which are not found to be publicly available in the expected location might be found at
http://docbox.etsi.org/Reference.
NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee
their long term validity.
2.1 Normative references
The following referenced documents are necessary for the application of the present document.
[1] ETSI EN 300 019-1-4: "Environmental Engineering (EE); Environmental conditions and
environmental tests for telecommunications equipment; Part 1-4: Classification of environmental
conditions; Stationary use at non-weatherprotected locations".
[2] ETSI EN 300 019-1-3: "Environmental Engineering (EE); Environmental conditions and
environmental tests for telecommunications equipment; Part 1-3: Classification of environmental
conditions; Stationary use at weatherprotected locations".
2.2 Informative references
The following referenced documents are not necessary for the application of the present document but they assist the
user with regard to a particular subject area.
[i.1] ETSI EN 300 386: "Electromagnetic compatibility and Radio spectrum Matters
(ERM);Telecommunication network equipment; ElectroMagnetic Compatibility (EMC)
requirements".
ETSI

---------------------- Page: 6 ----------------------
7 ETSI ES 203 156 V1.2.1 (2014-08)
[i.2] ETSI EN 301 489-1: "Electromagnetic compatibility and Radio spectrum Matters (ERM);
ElectroMagnetic Compatibility (EMC) standard for radio equipment and services;
Part 1: Common technical requirements".
[i.3] IEC 61969-3: "Mechanical structures for electronic equipment - Outdoor enclosures -
Part 3: Sectional specification - Climatic, mechanical tests and safety aspects for cabinets and
cases".
[i.4] ETSI EN 301 169-1: "Equipment practice; Engineering requirements for outdoor enclosures;
Part 1: Equipped enclosures".
[i.5] ETSI EN 301 169-2: "Equipment practice; Engineering requirements for outdoor enclosures;
Part 2: Unequipped enclosures".
[i.6] ETSI EN 300 119-5: "Environmental Engineering (EE); European telecommunication standard for
equipment practice; Part 5: Thermal management".
[i.7] CENELEC EN 60950-1: "Information technology equipment - Safety - Part 1: General
requirements".
[i.8] CENELEC EN 60950-22: "Information technology equipment - Safety - Part 22: Equipment
installed outdoors".
[i.9] ETSI EN 300 753: "Environmental Engineering (EE); Acoustic noise emitted by
telecommunications equipment".
[i.10] ETSI EN 300 019-2-4: "Environmental Engineering (EE); Environmental conditions and
environmental tests for telecommunications equipment; Part 2-4: Specification of environmental
tests; Stationary use at non-weatherprotected locations".
[i.11] ETSI TR 101 576: "Environmental Engineering (EE); Recommendation for the applicability of
environmental classes in outdoor cabinet environment".
3 Definitions, symbols and abbreviations
3.1 Definitions
For the purposes of the present document, the following terms and definitions apply:
air conditioning: cooling technology where an operating refrigerator system is used for cooling the internal air of the
enclosure
ambient: spatial maximal temperature of the air entering the rack/cabinet
cabinet: free-standing and self-supporting enclosure for housing electrical and/or electronics equipment, usually fitted
with doors and/or side panels which may or may not be removable
free cooling: cooling technology in which the external air is directly used for the inside heat removal; also called direct
free cooling
heat exchanger: cooling technology in which the inside heat removal is provided (actively with fans or passively
without fans) without directly use of outside air but using an exchange between two fluids (e.g. air to air or water to air)
integrator: end user/operator of telecommunication or IT equipment or their agent
NOTE: For example an equipment manufacturer could be an operator's agent.
micro-climate: conditions found within the rack/cabinet creating a local ambient for the subrack
outdoor enclosures: enclosure exposed for the outdoor environment, for stationary use at non-weatherprotected
locations, for the protection of electronic equipment installed inside against outdoor environmental conditions
(IEC 61969-3 [i.3])
ETSI

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8 ETSI ES 203 156 V1.2.1 (2014-08)
outdoor location: location for equipment where protection from the weather and other outdoor influences provided by
a building or other structure is limited or non-existent
3.2 Symbols
For the purposes of the present document, the following symbols apply:
CC cooling capacity of outdoor enclosure [W/K]
Q heat dissipation from equipment inside cabinet [W]
T surrounding ambient temperature [°C] in which the outdoor enclosure is positioned
ambient
T temperature of air at the equipment inlet inside the cabinet [°C]
inlet
△T temperature difference between T and T [K]
inlet ambient
3.3 Abbreviations
For the purposes of the present document, the following abbreviations apply:
COP Coefficient Of Performance
ICT Information and Communication Technology
TCU Temperature Control Unit
EXAMPLE: Fresh air cooling, heat- exchanger, air-conditioner.
4 General requirements
4.1 Thermal performance of outdoor enclosures
The supplier of outdoor enclosures shall design the cabinet so that the product fulfils the outdoor environment as
detailed in EN 300 019-1-4 [1], class 4.1. And under this environment class, the cabinet can ensure the equipments
whose environment class is defined in clause 4.2 of the present document to work in appropriate micro-climate.
To enable the operators/integrators to predict the thermal performance of outdoor enclosures and to decide the
equipment configuration inside, The supplier of outdoor enclosures should provide the relevant thermal characteristics
detailed in annex A of the present document.
4.2 Environmental class requirements for equipment installed in
outdoor enclosures
Possible use of environmental class for equipment installed in outdoor enclosures is discussed in TR 101 576 [i.11].
The outdoor enclosure provides a weather protected environment for the inside equipment. For effective cooling, the
equipment inlet air temperature, using some cooling technologies, is higher than the outdoor air temperature.
In the following is considered that the outdoor enclosure is required to meet EN 300 019-1-4 [1], class 4.1 with
temperature range from -33 °C to +40 °C; in this case the climatic conditions for the equipment inside the outdoor
cabinet shall be those defined in clauses 4.2.1 to 4.2.3 of the present
...

Final draft ETSI ES 203 156 V1.2.0 (2014-06)






ETSI Standard
Environmental Engineering (EE);
Thermal Management requirements for outdoor enclosures

---------------------- Page: 1 ----------------------
2 Final draft ETSI ES 203 156 V1.2.0 (2014-06)



Reference
RES/EE-0159
Keywords
air flow, cooling capacity, environment,
management, outdoor enclosure, thermal
ETSI
650 Route des Lucioles
F-06921 Sophia Antipolis Cedex - FRANCE

Tel.: [phone]  Fax: [phone]

Siret N° 348 623 562 00017 - NAF 742 C
Association à but non lucratif enregistrée à la
Sous-Préfecture de Grasse (06) N° 7803/88

Important notice
The present document can be downloaded from:
http://www.etsi.org
The present document may be made available in electronic versions and/or in print. The content of any electronic and/or
print versions of the present document shall not be modified without the prior written authorization of ETSI. In case of any
existing or perceived difference in contents between such versions and/or in print, the only prevailing document is the
print of the Portable Document Format (PDF) version kept on a specific network drive within ETSI Secretariat.
Users of the present document should be aware that the document may be subject to revision or change of status.
Information on the current status of this and other ETSI documents is available at
http://portal.etsi.org/tb/status/status.asp
If you find errors in the present document, please send your comment to one of the following services:
http://portal.etsi.org/chaircor/ETSI_support.asp
Copyright Notification
No part may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying
and microfilm except as authorized by written permission of ETSI.
The content of the PDF version shall not be modified without the written authorization of ETSI.
The copyright and the foregoing restriction extend to reproduction in all media.

© European Telecommunications Standards Institute 2014.
All rights reserved.

TM TM TM
DECT , PLUGTESTS , UMTS and the ETSI logo are Trade Marks of ETSI registered for the benefit of its Members.
TM
3GPP and LTE™ are Trade Marks of ETSI registered for the benefit of its Members and
of the 3GPP Organizational Partners.
GSM® and the GSM logo are Trade Marks registered and owned by the GSM Association.
ETSI

---------------------- Page: 2 ----------------------
3 Final draft ETSI ES 203 156 V1.2.0 (2014-06)
Contents
Intellectual Property Rights . 5
Foreword . 5
Modal verbs terminology . 5
Introduction . 5
1 Scope . 6
2 References . 6
2.1 Normative references . 6
2.2 Informative references . 6
3 Definitions, symbols and abbreviations . 7
3.1 Definitions . 7
3.2 Symbols . 8
3.3 Abbreviations . 8
4 General requirements . 8
4.1 Thermal performance of outdoor enclosures . 8
4.2 Environmental class requirements for equipment installed in outdoor enclosures . 8
4.2.1 Free cooling cabinet . 8
4.2.2 Heat exchanger cabinet . 8
4.2.3 Air conditioning cabinet . 9
5 Thermal management . 9
5.1 Standardized definition of cooling capacity . 9
5.2 Maximum acceptable delta T . 10
5.3 The preferable rule for air flow . 10
5.3.1 Air flow paths of outdoor enclosures . 10
5.3.2 Preferable rule for air flow path match . 11
5.3.2.1 Door-mounted TCU . 11
5.3.2.2 Roof -mounted TCU . 12
5.3.2.3 Side-mounted TCU . 13
Annex A (normative): Thermal characterization data of outdoor enclosures to be provided
by the manufacturer . 14
A.1 General identification . 14
A.1.1 Identification . 14
A.1.2 Physical geometry . 14
A.2 Additional data for outdoor enclosures . 14
A.2.1 Mechanical characteristics of outdoor enclosures . 15
A.2.2 Fan/Fan tray. 15
A.2.3 Air filter of outdoor enclosures . 15
A.2.4 Airflow paths . 16
A.2.5 Cooling capacity . 16
Annex B (informative): Ambient temperature measurement point . 17
B.1 measurement point requirement . 17
Annex C (informative): Solar radiation. 18
Annex D (informative): Requirements for safety and EMC . 19
D.1 Requirements for safety. 19
D.2 Requirements for EMC . 19
D.3 Acoustic Noise Level requirement . 19
ETSI

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4 Final draft ETSI ES 203 156 V1.2.0 (2014-06)
Annex E (informative): Cabinet performance parameters . 20
Annex F (informative): Bibliography . 21
History . 22

ETSI

---------------------- Page: 4 ----------------------
5 Final draft ETSI ES 203 156 V1.2.0 (2014-06)
Intellectual Property Rights
IPRs essential or potentially essential to the present document may have been declared to ETSI. The information
pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found
in ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in
respect of ETSI standards", which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web
server (http://ipr.etsi.org).
Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee
can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web
server) which are, or may be, or may become, essential to the present document.
Foreword
This final draft ETSI Standard (ES) has been produced by ETSI Technical Committee Environmental Engineering (EE),
and is now submitted for the ETSI standards Membership Approval Procedure.
Modal verbs terminology
In the present document "shall", "shall not", "should", "should not", "may", "may not", "need", "need not", "will",
"will not", "can" and "cannot" are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms
for the expression of provisions).
"must" and "must not" are NOT allowed in ETSI deliverables except when used in direct citation.
Introduction
Outdoor enclosure suppliers are trying to overcome their thermal issues in different solutions being developed. When
different equipments and outdoor enclosures from various suppliers are integrated, they can have a detrimental effect on
each other. The present document specifies the thermal management requirements for outdoor enclosures (defined in
EN 301 169-1 [i.4] and EN 301 169-2 [i.5]) to prevent outdoor enclosures having a detrimental thermal influence on
equipments inside.
ETSI

---------------------- Page: 5 ----------------------
6 Final draft ETSI ES 203 156 V1.2.0 (2014-06)
1 Scope
The present document describes the thermal management requirements for outdoor enclosures defined in
EN 301 169-1 [i.4] and EN 301 169-2 [i.5]. These thermal management requirements to be defined include:
• a standardized definition of cooling capacity for outdoor enclosures;
• a maximum acceptable delta T between ambient temperature and inside temperature;
• the preferable rule for air flow inside outdoor enclosures;
• the environment class for telecommunication equipment of wireline and wireless access network to be
installed in outdoor enclosures.
Not all these requirement are applicable to outdoor enclosures defined in EN 301 169-1 [i.4] and EN 301 169-2 [i.5];
maximum acceptable delta T for equipment in line with EN 301 169-1 [i.4] should be considered as a guide to
developer.
The purpose of the present document is to make it more easy to define the responsibility of equipment manufacturers,
cabinet manufacturers and integrators.
EMC, safety and acoustic noise requirements are not parts of the present document. Guidance on these aspects are
contained in annex D.
2 References
References are either specific (identified by date of publication and/or edition number or version number) or
non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the
reference document (including any amendments) applies.
Referenced documents which are not found to be publicly available in the expected location might be found at
http://docbox.etsi.org/Reference.
NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee
their long term validity.
2.1 Normative references
The following referenced documents are necessary for the application of the present document.
[1] ETSI EN 300 019-1-4: "Environmental Engineering (EE); Environmental conditions and
environmental tests for telecommunications equipment; Part 1-4: Classification of environmental
conditions; Stationary use at non-weatherprotected locations".
[2] ETSI EN 300 019-1-3: "Environmental Engineering (EE); Environmental conditions and
environmental tests for telecommunications equipment; Part 1-3: Classification of environmental
conditions; Stationary use at weatherprotected locations".
2.2 Informative references
The following referenced documents are not necessary for the application of the present document but they assist the
user with regard to a particular subject area.
[i.1] ETSI EN 300 386: "Electromagnetic compatibility and Radio spectrum Matters
(ERM);Telecommunication network equipment; ElectroMagnetic Compatibility (EMC)
requirements".
ETSI

---------------------- Page: 6 ----------------------
7 Final draft ETSI ES 203 156 V1.2.0 (2014-06)
[i.2] ETSI EN 301 489-1: "Electromagnetic compatibility and Radio spectrum Matters (ERM);
ElectroMagnetic Compatibility (EMC) standard for radio equipment and services;
Part 1: Common technical requirements".
[i.3] IEC 61969-3: "Mechanical structures for electronic equipment - Outdoor enclosures -
Part 3: Sectional specification - Climatic, mechanical tests and safety aspects for cabinets and
cases".
[i.4] ETSI EN 301 169-1: "Equipment practice; Engineering requirements for outdoor enclosures;
Part 1: Equipped enclosures".
[i.5] ETSI EN 301 169-2: "Equipment practice; Engineering requirements for outdoor enclosures;
Part 2: Unequipped enclosures".
[i.6] ETSI EN 300 119-5: "Environmental Engineering (EE); European telecommunication standard for
equipment practice; Part 5: Thermal management".
[i.7] CENELEC EN 60950-1: "Information technology equipment - Safety - Part 1: General
requirements".
[i.8] CENELEC EN 60950-22: "Information technology equipment - Safety - Part 22: Equipment
installed outdoors".
[i.9] ETSI EN 300 753: "Environmental Engineering (EE); Acoustic noise emitted by
telecommunications equipment".
[i.10] ETSI EN 300 019-2-4: "Environmental Engineering (EE); Environmental conditions and
environmental tests for telecommunications equipment; Part 2-4: Specification of environmental
tests; Stationary use at non-weatherprotected locations".
[i.11] ETSI TR 101 576: "Environmental Engineering (EE); Recommendation for the applicability of
environmental classes in outdoor cabinet environment".
3 Definitions, symbols and abbreviations
3.1 Definitions
For the purposes of the present document, the following terms and definitions apply:
air conditioning: cooling technology where an operating refrigerator system is used for cooling the internal air of the
enclosure
ambient: spatial maximal temperature of the air entering the rack/cabinet
cabinet: free-standing and self-supporting enclosure for housing electrical and/or electronics equipment, usually fitted
with doors and/or side panels which may or may not be removable
free cooling: cooling technology in which the external air is directly used for the inside heat removal; also called direct
free cooling
heat exchanger: cooling technology in which the inside heat removal is provided (actively with fans or passively
without fans) without directly use of outside air but using an exchange between two fluids (e.g. air to air or water to air)
integrator: end user/operator of telecommunication or IT equipment or their agent
NOTE: For example an equipment manufacturer could be an operator's agent.
micro-climate: conditions found within the rack/cabinet creating a local ambient for the subrack
outdoor enclosures: enclosure exposed for the outdoor environment, for stationary use at non-weatherprotected
locations, for the protection of electronic equipment installed inside against outdoor environmental conditions
(IEC 61969-3 [i.3])
ETSI

---------------------- Page: 7 ----------------------
8 Final draft ETSI ES 203 156 V1.2.0 (2014-06)
outdoor location: location for equipment where protection from the weather and other outdoor influences provided by
a building or other structure is limited or non-existent
3.2 Symbols
For the purposes of the present document, the following symbols apply:
CC cooling capacity of outdoor enclosure [W/K]
Q heat dissipation from equipment inside cabinet [W]
T surrounding ambient temperature [°C] in which the outdoor enclosure is positioned
ambient
T temperature of air at the equipment inlet inside the cabinet [°C]
inlet
△T temperature difference between T and T [K]
inlet ambient
3.3 Abbreviations
For the purposes of the present document, the following abbreviations apply:
COP Coefficient Of Performance
ICT Information and Communication Technology
TCU Temperature Control Unit
EXAMPLE: Fresh air cooling, heat- exchanger, air-conditioner.
4 General requirements
4.1 Thermal performance of outdoor enclosures
The supplier of outdoor enclosures shall design the cabinet so that the product fulfils the outdoor environment as
detailed in EN 300 019-1-4 [1], class 4.1. And under this environment class, the cabinet can ensure the equipments
whose environment class is defined in clause 4.2 of the present document to work in appropriate micro-climate.
To enable the operators/integrators to predict the thermal performance of outdoor enclosures and to decide the
equipment configuration inside, The supplier of outdoor enclosures should provide the relevant thermal characteristics
detailed in annex A of the present document.
4.2 Environmental class requirements for equipment installed in
outdoor enclosures
Possible use of environmental class for equipment installed in outdoor enclosures is discussed in TR 101 576 [i.11].
The outdoor enclosure provides a weather protected environment for the inside equipment. For effective cooling, the
equipment inlet air temperature, using some cooling technologies, is higher than the outdoor air temperature.
In the following is considered that the outdoor enclosure is required to meet EN 300 019-1-4 [1], class 4.1 with
temperature range from -33 °C to +40 °C; in this case the climatic conditions for the equipment inside the outdoor
cabinet shall be those defined in clauses 4.2.1
...