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BS EN IEC 62610-6:2020

BS EN IEC 62610-6:2020

$142.49

Mechanical structures for electrical and electronic equipment. Thermal management for cabinets in accordance with IEC 60297 and IEC 60917 series – Air recirculation and bypass of indoor cabinets

Published By Publication Date Number of Pages
BSI 2020 30
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This part of IEC 62610 which deals with thermal management for cabinets in accordance with IEC 60297 and IEC 60917 series, provides compatible measurement methods of recirculation ratio and bypass ratio which are indicators for defining quality of airflow in the forced air cooling that can be commonly applied to indoor cabinets for mounting subrack and/or chassis-based equipment.

NOTE 1 Both recirculation and bypass represent leakage airflows, i.e. detrimental phenomena in terms of cooling efficiency; their measurement is obviously aimed at their mitigation.

This document contains the following:

  1. the definition of recirculation and bypass flow rates in the cooling of the cabinet,

  2. the levels of the recirculation ratio RC,

  3. the definition of the formula for the recirculation ratio RCs of forced air cooling subrack and/or chassis-based equipment installed in the cabinet,

  4. the definition formula of recirculation ratio RCr and bypass rate BPr of the entire cabinet,

  5. the requirements of the measuring method of each temperature necessary for calculating the recirculation ratio RCs, RCr and bypass ratio BPr.

NOTE 2 This document includes the definition of measuring bypass ratio, but excludes the definition of levels of bypass ratio.

The drawings used are not intended to indicate product design. They are only for explanatory indications for defining forced air cooling airflows.

The recirculation and bypass measurement methods dealt with in this document are assumed to be applied to a cabinet installed indoors. The cooling air inlet is at the front or the bottom of the cabinet and the heated air is exhausted to the rear or the top. These methods are also applicable to a cabinet that is installed outdoors and has a cooling device such as a heat exchanger or an air conditioner on the front or the back (see Annex C).

The recirculation ratio of a subrack or a cabinet is defined for each individual subrack or chassis-based equipment mounted in the cabinet or for the entire cabinet. The bypass ratio of a cabinet is defined for the entire cabinet.

PDF Catalog

PDF Pages PDF Title
2 undefined
5 Annex ZA(normative)Normative references to international publicationswith their corresponding European publications
7 CONTENTS
9 FOREWORD
11 INTRODUCTION
12 1 Scope
2 Normative references
13 3 Terms and definitions
4 Recirculation level
14 5 Determination of recirculation and bypass ratio
5.1 Cooling airflow in a cabinet
Figures
Figure 1 – Airflow in a cabinet
Tables
Table 1 – Recirculation level
15 5.2 Recirculation ratio of a subrack
Figure 2 – Diagram of cabinet airflows
16 5.3 Recirculation ratio of a cabinet
5.4 Bypass ratio of a cabinet
6 Measurement of recirculation and bypass
6.1 Measurement of recirculation of a subrack
17 6.2 Measurement of recirculation of a cabinet
6.3 Measurement of bypass of a cabinet
6.4 Measurement methods of temperature
6.4.1 Intake air temperature of a subrack
18 6.4.2 Intake air temperature of a subrack group
6.4.3 Exhaust air temperature of a subrack
6.4.4 Exhaust air temperature of a subrack group
6.4.5 Intake air temperature of a cabinet
6.4.6 Exhaust air temperature of a cabinet
19 6.5 Measurement method of recirculation for an empty cabinet
20 Annex A (normative)Measurement method of recirculation with dummy thermal loads
A.1 Purpose
A.2 Specifications
A.2.1 DTL
A.2.2 Cabinet specifications
Table A.1 – Specifications of DTL
21 A.2.3 Measurement configurations
A.3 Environmental conditions
A.4 Measurement positions
A.4.1 Intake air temperature of DTL
A.4.2 Exhaust air temperature of DTL
A.4.3 Intake air temperature of a cabinet
A.4.4 Exhaust air temperature of a cabinet
A.4.5 Evaluation of recirculation ratio of a subrack
A.4.6 Evaluation of recirculation and bypass ratio of a cabinet
A.5 Case study
22 Figure A.1 – Outline drawings of DTL
Figure A.2 – Experimental setup of a cabinet and DTL
Table A.2 – Specifications of DTL
23 Figure A.3 – Measurement points of intake air temperature of DTL
Figure A.4 – Measurement points of exhaust air temperature of DTL
Figure A.5 – Measurement points of intake air temperature of a cabinet
Figure A.6 – Measurement points of exhaust air temperature of a cabinet
24 A.6 Relationship between recirculation ratio and intake temperature rise
Table A.3 – Test result
Table A.4 – Recirculation and bypass ratio of a cabinet
25 Figure A.7 – Recirculation ratio vs intake air temperature rise
26 Annex B (normative)Derivation of recirculation and bypass in a cabinet
B.1 General
B.2 Derivation of recirculation and bypass
27 Annex C (informative)Application of recirculation and bypass to outdoor cabinets
C.1 General
C.2 Application example
28 Figure C.1 – Outdoor cabinet airflow schematic
Figure C.2 – Airflow diagram and air temperature in outdoor cabinet
Table C.1 – A case study of an outdoor cabinet
29 Bibliography

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BS EN IEC 62610-6:2020
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