GB/T 46752-2025 Integrated high-efficiency air conditioning cold source system for buildings English, Anglais, Englisch, Inglés, えいご
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ICS 13.220.10
CCS H 57
National Standard of the People's Republic of China
GB/T 46752-2025
Integrated high-efficiency air conditioning cold source system for buildings
建筑整体式高效空调冷源系统
Issue date: 2025-10-31 Implementation date: 2026-05-01
Issued by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
the Standardization Administration of the People's Republic of China
Contents
Foreword
1 Scope
2 Normative References
3 Terms and Definitions
4 Model Designation
5 General Requirements
6 Requirements
7 Test Methods
8 Inspection Rules
9 Marking, Accompanying Documents, and Storage
Appendix A (Normative) Test Methods for Cold Source System Performance
Bibliography
1 Scope
This document specifies the model designation, general requirements, requirements, test methods, inspection rules, as well as marking, accompanying documents, and storage for integrated high-efficiency air conditioning cold source systems for buildings (hereinafter referred to as "the cold source system").
This document applies to integrated air conditioning cold source systems used in civil buildings that employ motor-driven vapor-compression cycle water-cooled chillers (heat pumps) to meet indoor environmental conditioning requirements.
2 Normative References
The following documents, through normative references in the text, constitute essential provisions of this document. For dated references, only the edition corresponding to that date is applicable to this document. For undated references, the latest edition (including all amendments) is applicable.
GB/T 3216 Rotodynamic pumps - Hydraulic performance acceptance tests - Grades 1, 2 and 3
GB/T 3797 Electrical control assemblies
GB/T 4208 Degrees of protection provided by enclosure (IP Code)
GB/T 7190 (all parts) Mechanical draught cooling towers
GB/T 7251.1-2023 Low-voltage switchgear and controlgear assemblies - Part 1: General rules
GB/T 10870-2014 Methods of performance test for vapor compression cycle water-chilling (heat pump) packages
GB/T 14285 Technical code for relaying protection and security automatic equipment
GB/T 16803 Terms for heating, ventilation, air conditioning and air cleaning equipment
GB/T 18209 (all parts) Safety of machinery - Electrical equipment of machines - Indication, marking and actuation
GB/T 18216 (all parts) Electrical safety in low voltage distribution systems up to 1 000 V a.c. and 1 500 V d.c. - Equipment for testing, measuring or monitoring of protective measures
GB/T 18268.1 Electrical equipment for measurement, control and laboratory use - EMC requirements - Part 1: General requirements
GB 18613 Minimum allowable values of energy efficiency and energy efficiency grades for electric motors
GB 19762 Minimum allowable values of energy efficiency and energy efficiency grades for centrifugal pumps
GB/T 24621.1 Guide for electrical safety of low-voltage switchgear and controlgear assemblies - Part 1: Switchgear assemblies
GB 25131 Safety requirements for vapor compression cycle water-chilling (heat pump) packages
GB/T 29044 Water quality for heating and air-conditioning systems
GB 50052 Code for design of electric power supply systems
GB 50054 Code for design of low voltage electrical installations
GB/T 50155 Standard for terminology of heating, ventilation and air conditioning
GB 50169 Code for construction and acceptance of earthing connection installation for electrical equipment
GB 50243-2016 Code of acceptance for construction quality of ventilation and air conditioning works
GB 50303 Code of acceptance of construction quality of building electrical installations
GB 50339 Code for acceptance of construction quality of intelligent building systems
GB 50736 Design code for heating ventilation and air conditioning of civil buildings
GB 50738 Code for construction of ventilation and air conditioning works
GB 51348 Standard for design of electrical installations in civil buildings
JB/T 7249 Terminology for refrigeration and air conditioning equipment
JB/T 14075-2022 Integrated distribution system for water-cooled chiller (heater) units
JGJ/T 177-2009 Standard for energy efficiency test of public buildings
JGJ/T 260-2011 Technical specification for testing of heating ventilation and air conditioning works
JGJ/T 334 Technical code for engineering of building automation system
3 Terms and Definitions
The terms and definitions defined in GB/T 50155, GB/T 16803, and JB/T 7249 and the following apply to this document.
3.1
Integrated high-efficiency air conditioning cold source system for buildings
An integrated air conditioning cold source system used in buildings, consisting of chillers, a distribution system (including chilled water pumps, condenser water pumps, pipelines and accessories, water treatment and circulation devices), cooling towers, power distribution and control systems, and auxiliary supporting facilities. It is assembled and commissioned in the factory and meets the relevant condition coefficients of performance.
3.2
Standard conditions of cold source system
One or a set of operating conditions for the cold source system specified in this document that establish a comparable benchmark.
Note: Standard conditions include the conditions specified in Table A.1 and the IPLVS condition in Table A.2.
3.3
Coefficient of performance of cold source system
COPS
Under specified standard conditions, the ratio of the cooling capacity of the cold source system to its total input electrical power, expressed in the same units.
Note: The unit is kilowatt per kilowatt (kW/kW).
3.4
Integrated part load value of cold source system
IPLVS
A single numerical value representing the part-load efficiency of the cold source system, calculated by weighting the coefficients of performance at part-load conditions under specified standard conditions based on the cumulative load percentages under various load conditions.
Note: The unit is kilowatt per kilowatt (kW/kW).
3.5
External head of cold source system
The differential pressure between the supply and return water for the chilled water side of the cold source system, after overcoming the system's own resistance, that can be used to overcome the fluid flow resistance in user equipment and the pipe network.
Note: Abbreviated as "external head".
3.6
Working pressure of cold source system
The pressure endured by equipment, pipelines, and components during normal operation of the cold source system.
4 Model Designation
The method for compiling the model designation of the cold source system may be determined by the manufacturer. However, the model should reflect the nominal cooling capacity, nominal input power, nominal condition coefficient of performance, integrated part load value, working pressure, nominal external head, and nominal chilled water flow rate of the cold source system.
5 General Requirements
5.1 Equipment for the cold source system shall be reasonably selected based on factors such as building scale, usage characteristics, and performance requirements, and shall comply with the following provisions:
a) The energy efficiency of chillers should not be lower than energy efficiency grade 2 as specified in GB 19577;
b) Pumps shall be variable speed pumps. Pump motors should preferably be variable frequency motors. The energy efficiency of pumps shall not be lower than energy efficiency grade 2 as specified in GB 19762. The efficiency of pump motors shall not be lower than energy efficiency grade 2 as specified in GB 18613;
