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Testing of refrigerating systems
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Basic data
| Standard ID | GB/T 44545-2024 (GB/T44545-2024) |
| Description (Translated English) | Testing of refrigerating systems |
| Sector / Industry | National Standard (Recommended) |
| Classification of Chinese Standard | J73 |
| Classification of International Standard | 27.200 |
| Word Count Estimation | 22,269 |
| Date of Issue | 2024-09-29 |
| Date of Implementation | 2025-04-01 |
| Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration |
GB/T 44545-2024: Testing of refrigerating systems
---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
ICS 27.200
CCSJ73
National Standard of the People's Republic of China
Refrigeration system test
(ISO 916.2020,MOD)
Released on 2024-09-29
2025-04-01 Implementation
State Administration for Market Regulation
The National Standardization Administration issued
Table of Contents
Preface III
1 Scope 1
2 Normative references 1
3 Terms and Definitions 1
4 Symbols and units 1
5 Performance Guarantee 3
6 Experimental preparation and procedures 5
7 Measuring instruments 5
8 Measurement of cooling capacity 6
9 Measurement of power consumption 11
10 Measurement uncertainty12
11 Test results and conversion to guaranteed values 12
12 Material properties 13
Appendix A (Informative) Working Condition Result Conversion 14
References 16
Foreword
This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1.Structure and drafting rules for standardization documents"
Drafting.
This document is modified to adopt ISO 916.2020 "Refrigeration system tests".
The technical differences between this document and ISO 916.2020 and their reasons are as follows.
--- Change "then this method is not applicable" in the fourth paragraph of 8.1.2 to "then this method can be used as a reference" to improve the applicability of this document;
--- Change the temperature unit K in the whole text to the domestically used ℃ (see Chapter 4 and 7.2, etc.) for ease of use;
--- ISO /IEC Guide 98-3 is replaced by the normative reference GB/T 27418 to make the measurement method more specific (see 10.1).
The following editorial changes were made to this document.
--- Added notes (see 5.1.2 and 11.3);
--- Replaced ISO 5167 (all parts) with the informative reference GB/T 2624 (all parts) to adapt to my country's technical requirements
parts, improve operability (see Chapter 6);
--- Added Appendix A (informative) "Conversion of working conditions results".
Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents.
This document was proposed by the China Machinery Industry Federation.
This document is under the jurisdiction of the National Technical Committee for Standardization of Refrigeration and Air-conditioning Equipment (SAC/TC238).
This document was drafted by. Hefei General Electromechanical Products Testing Institute Co., Ltd., Tsinghua University, Guangdong Phoenix Energy Saving Equipment Co., Ltd.,
Qingdao Hisense Hitachi Air Conditioning System Co., Ltd., Guangdong Midea HVAC Equipment Co., Ltd., Anhui University, Hefei General Environmental Control Technology Co., Ltd.
Responsible Company, Wucheng County Inspection and Testing Center, Hefei General Machinery Research Institute Co., Ltd.
The main drafters of this document are. Li Zhiliang, Jiang Jizhou, Shi Wenxing, Liu Yuanhui, Teng Keyu, Ding Yunxiao, Ding Shichuan, Zan Shichao, Zhang Guangming,
Chen Hai, Zhou Junhai, Liang Ping, Zhou Quan.
Refrigeration system test
1 Scope
This document specifies the performance test of compressor driven refrigeration system (hereinafter referred to as refrigeration system), which is based on vapor compression
The refrigeration circuit consists of the compression, condensation, throttling and evaporation circuits as well as the connecting pipes and any necessary auxiliary equipment required for the entire refrigeration circuit.
composition.
This document applies to tests performed in or outside the laboratory and in the absence of specific test standards, according to agreed
Test of the refrigeration system under the operating conditions of the
This document is not applicable to the testing of other refrigeration systems (such as absorption or steam ejector refrigeration systems) nor to the testing of household
Testing of refrigeration systems for specific purposes such as refrigerators, commercial refrigeration and display cabinets, air conditioners, etc.
2 Normative references
The contents of the following documents constitute essential clauses of this document through normative references in this document.
For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to
This document.
GB/T 27418 Evaluation and Expression of Uncertainty in Measurement (GB/T 27418-2017, ISO /IEC Guide 98-3.2008, MOD)
3 Terms and definitions
The following terms and definitions apply to this document.
3.1
Qog
The amount of heat absorbed by the refrigerant from the environment per unit time.
Note. Generally, for a single-stage refrigeration system, the total refrigeration capacity is equal to the refrigerant mass flow rate (hereinafter referred to as refrigerant flow rate) flowing through the evaporator and the refrigerant mass flow rate at the compressor inlet.
and the product of the enthalpy difference of the refrigerant at the outlet of the condenser or subcooler (if provided) (see also 8.1.1).
3.2
Qon
The amount of heat absorbed by the refrigerant from the cooled medium in the evaporator per unit time.
Note. See also 8.1.2.
3.3
Qoe
The effective heat absorbed by the refrigerant or cooling medium per unit time.
Note. The effective cooling capacity is equal to the product of the mass flow rate of the refrigerant or the medium to be cooled and the enthalpy difference between the two points at which it is effectively cooled according to the regulations (see also 8.1.3).
4 Symbols and units
The parameters, symbols and measuring point indexes involved in this document are shown in Tables 1, 2 and 3.
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