GB/T 44409.2-2026Heating, ventilation and air conditioning systems for rolling stock - Part 2: Thermal comfort (English PDF)

Foreword

This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1: Structure and Drafting Rules of Standardization Documents".

Drafting.

This document is Part 2 of GB/T 44409 "Air Conditioning Systems for Locomotives and Rolling Stock". GB/T 44409 has already published the following parts.

---Part 1: Terms and Definitions;

---Part 2: Comfort;

---Part 3: Energy Efficiency this document supersedes GB/T 33193.1-2016 "Air Conditioning for Railway Vehicles - Part 1: Comfort Parameters" and GB/T 33193.2-2016.

Railway vehicle air conditioning - Part 2: Type testing. This document combines and revises GB/T 33193.1-2016 and GB/T 33193.2-2016.

Compared with the above standards, apart from structural adjustments and editorial changes, the main technical changes are as follows.

a) The types of passenger trains have been increased (see Chapter 4);

b) The equivalent solar radiation intensity for high-altitude areas (Kunming, Lhasa, Xining) has been modified (see 5.1.3, GB/T 33193.1-2016).

c) Added internal design requirements (see 5.3);

d) The internal set temperature was changed (see Chapter 6, Appendix A of GB/T 33193.1-2016);

e) The requirements for indoor air temperature in the comfort zone have been changed (see 7.2, 6.1 and 8.2 of GB/T 33193.1-2016);

f) Increased requirements for internal air temperature in the crew quarters, mechanic's room, and some ancillary spaces of the catering service area (see 7.6, GB/T 33193.1-).

(2016, 6.2)

g) The requirements for fresh air intake have been changed (see 7.8.1, 6.7.1 of GB/T 33193.1-2016);

h) The requirements for air particulate filtration have been changed (see 7.8.5, 9.3 of GB/T 33193.1-2016);

i) The requirements for vehicle interior pressure and pressure wave have been changed (see 8.6, 9.6 of GB/T 33193.1-2016);

j) The noise requirement has been removed (see 9.4 of GB/T 33193.1-2016);

k) Added relative humidity requirements for laboratories when the heat pump unit is in heating mode during winter (see 9.3.4.2);

l) A door opening/closing cycle test method has been added (see 9.3.6);

m) The test procedure for thermal insulation performance has been modified (see 9.4.2, 8.1.2 of GB/T 33193.2-2016);

n) Added air conditioning operation test content (see 9.5, 9.6, 9.7, 9.8);

o) Increased requirements for test data processing, calculation, and test reporting (see 9.9);

p) The method for arranging micro-wind speed measuring points has been modified (see Appendix F, Appendix A of GB/T 33193.2-2016);

q) The test procedure has been modified (see Appendix G, Appendix B of GB/T 33193.2-2016);

r) The method for arranging temperature difference measuring points has been modified (see Appendix H, Appendix N, Appendix C and Appendix F of GB/T 33193.2-2016);

s) The dynamic air test (see 5.2 of GB/T 33193.2-2016) has been removed;

t) The noise test method (see 8.3 of GB/T 33193.2-2016) has been removed;

u) The reliability and maintainability requirements have been removed (see 9.8 of GB/T 33193.1-2016);

v) The evaluation criteria have been removed (see Chapter 10 of GB/T 33193.1-2016).

This document is modified to adopt ISO 19659-2:2020 "Heating, ventilation and air conditioning systems for railway applications - Locomotives and rolling stock - Part 2".

(Divided into. Comfort).

Compared with ISO 19659-2:2020, this document has undergone many structural adjustments. A comparison of the structural numbering changes between the two documents is provided below.

See Appendix A for the table.

This document differs significantly from ISO 19659-2:2020 in several technical aspects. The relevant clauses are indicated in vertical margins.

Straight lines (|) are marked. A summary of these technical differences and their reasons can be found in Appendix B.

The following editorial changes have been made to this document.

---To align with existing standards, the standard title has been changed to "Air Conditioning Systems for Locomotives and Rolling Stock - Part 2: Comfort";

---Appendix A (Informative) Structure Numbering Comparison Table has been added;

---Appendix B (Informative) has been added, providing a summary of technical differences and their causes;

---Appendix K (Informative) has been added, outlining the processing, calculation, and reporting of experimental data;

---Note in 4.1 has been deleted;

---Notes 1 and 2 in section 5.2.2 have been deleted;

---The example of external design temperature and corresponding relative humidity in Annex A (informative) of ISO 19659-2:2020 has been deleted;

---The PMV calculation results for each vehicle category in Annex B (Informative) of ISO 19659-2:2020 have been deleted;

---The method for calculating the recommended wind speed range in Annex C (informative) of ISO 19659-2:2020 has been deleted.

Please note that some content in this document may involve patents. The issuing organization of this document assumes no responsibility for identifying patents.

This document was proposed and is under the jurisdiction of the National Railway Administration.

Introduction

Standards on air conditioning in rail transit vehicles developed by the International Organization for Standardization Technical Committee on Railway Applications (ISO/TC269). Terminology the document comprehensively defines the terminology and definitions, comfort parameters, and energy efficiency of air conditioning systems for locomotives and rolling stock, including definitions, thermal comfort, and energy efficiency.

Rates and testing methods, etc. To formulate standards for air conditioning systems of rail transit locomotives and rolling stock that conform to China's national conditions, improve the relevant standard system, and align with international standards...

The technical standard system for air conditioning in rail transit locomotives and rolling stock is aligned with international standards. Based on domestic application practices and relevant international standards, GB/T 44409 "Air Conditioning Standard for Rail Transit Locomotives and Rolling Stock" has been formulated.

Vehicle air conditioning system. GB/T 44409 includes, but is not limited to, the following parts.

---Part 1: Terms and Definitions. The purpose is to systematically and comprehensively define the terms, definitions, symbols, and usage of air conditioning systems in locomotives and rolling stock.

Abbreviations.

---Part 2: Comfort. The purpose is to specify the thermal comfort parameters and equipment performance requirements for the air conditioning systems of locomotives and rolling stock.

and experimental methods.

---Part 3: Energy Efficiency. The purpose is to specify methods for measuring, testing, and evaluating the energy efficiency of air conditioning systems in locomotives and rolling stock.

Locomotive and rolling stock air conditioning system Part 2: Comfort

1 Scope

This document specifies the types, design conditions, internal set temperature, comfort parameters, and supplementary parameters for the air conditioning systems of passenger trains.

Requirements, tests, characteristics of test equipment, measuring instruments, and arrangement of measuring points.

This document applies to the design, production, and inspection of air conditioning systems in locomotive and rolling stock passenger compartments, private rooms, and some auxiliary spaces, including the driver's cab.

Use as directed.

2 Normative references

The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are not included.

For references to documents, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies.

This document.

GB 3095 Ambient Air Quality Standard GB/T 12817-2021 General Technical Conditions for Railway Passenger Cars GB/T 40233-2021 Ergonomic measuring instruments for thermal environments (ISO 7726:1998, IDT) GB/T 44288 Air Conditioning Systems for Urban Rail Transit Vehicles GB/T 44409.1 Air conditioning systems for locomotives and rolling stock – Part 1: Terms and definitions (GB/T 44409.1-2024) ISO 19659-1:2017, MOD)

3 Terms and Definitions

The terms and definitions defined in GB/T 44409.1 apply to this document.

4 Types of passenger trains