GB/T 39976-2021 English PDF (GBT39976-2021)
GB/T 39976-2021 English PDF (GBT39976-2021)
GB/T 39976-2021: Evaporation cooling outdoor air conditioning equipment
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
Evaporation Cooling Outdoor Air Conditioning
ISSUED ON: MAY 21, 2021
IMPLEMENTED ON: DECEMBER 1, 2021
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative References ... 4
3 Terms and Definitions ... 5
4 Classification and Identification ... 6
5 General Requirements ... 6
6 Requirements ... 7
7 Test Methods ... 9
8 Inspection Rules ... 13
9 Marking, Packaging, Transportation and Storage ... 16
Evaporation Cooling Outdoor Air Conditioning
This Standard specifies the terms and definitions, classification and identification, general requirements, requirements, test methods, inspection rules, marking, packaging, transportation and storage of evaporation cooling outdoor air conditioning equipment.
This Standard is applicable to the production and detection of evaporation cooling outdoor air conditioning equipment.
2 Normative References
The following documents are indispensable to the application of this document. In terms of references with a specified date, only versions with a specified date are applicable to this document. In terms of references without a specified date, the latest version (including all the modifications) is applicable to this document. GB/T 191 Packaging - Pictorial Marking for Handling of Goods
GB/T 1019 General Requirements for the Package of Household and Similar Electrical Appliances
GB/T 1727 General Preparation of Paint Film
GB/T 2828.1 Sampling Procedures for Inspection by Attributes - Part 1: Sampling Schemes Indexed by Acceptance Quality Limit (AQL) for Lot-by-lot Inspection GB/T 9068 Determination of Sound Power Levels for Noise Emitted by Heating- ventilating and Air Conditioning Equipment - Engineering Method
GB/T 13306 Plates
GB/T 14294-2008 Central-station Air Handling Units
GB/T 14295 Air Filter
GB/T 21087-2020 Energy Recovery Ventilators for Outdoor Air Handling
GB 25131 Safety Requirements for Water Chillers (heat pump) Using the Vapor Compression Cycle
GB/T 30192-2013 Water Evaporative Cooling Air Handling Unit
3 Terms and Definitions
The following terms and definitions are applicable to this document.
3.1 Evaporation Cooling Outdoor Air Conditioning Equipment
Evaporation cooling outdoor air conditioning equipment refers to an air conditioning equipment that adopts the method of evaporative cooling for the centralized processing of fresh air.
3.2 Direct Evaporative Cooling
Directive evaporative cooling refers to the process, in which, air and water are in direct contact, and the air is cooled due to the evaporation of water and the absorption of latent heat of vaporization.
NOTE: direct evaporative cooling is also known as primary evaporative cooling. 3.3 Indirect Evaporative Cooling
Indirect evaporative cooling refers to the process, in which, air passes through a heat exchanger and exchanges heat with evaporatively cooled water to be cooled. NOTE: indirect evaporative cooling is also known as secondary evaporative cooling. 3.4 Composite Evaporative Cooling
Composite evaporative cooling refers to a combination of direct evaporative cooling with one or several indirect evaporative cooling.
NOTE: composite evaporative cooling is also known as multi-stage evaporative cooling. 3.5 Evaporative Cooling Equipment
Evaporative cooling equipment refers to a device with direct evaporative cooling device, indirect evaporative cooling device or composite evaporative cooling device as the main air cooling equipment.
3.6 Rated Water Consumption Ratio of Cooling
Rated water consumption ratio of cooling refers to the ratio of the unit’s rated cooling capacity to the rated water consumption under rated conditions.
5.1.1 The equipment shall be manufactured in accordance with the stipulations of this Standard, and the drawings and technical documents approved by the regulated procedures.
5.1.2 The air inlet of the unit shall be equipped with medium-efficiency air filters with an efficiency not lower than what is specified in GB/T 14295.
5.1.3 During use, transportation, storage and sales, the equipment and its components shall not become a source of pollution, and shall not cause harm to the human body, or cause secondary pollution to the environment.
5.2.1 The component materials shall not degrade the cold medium quality or the air. 5.2.2 The materials of the main parts of the equipment shall comply with the requirements for material selection.
5.2.3 The fans, filters and evaporative cooling devices shall comply with the current relevant national standards.
5.3.1 The equipment shall be able to withstand the weight and pressure required for installation, operation and maintenance.
5.3.2 The equipment shall ensure the convenience of overhaul and maintenance. 6 Requirements
6.1.1 The preparation of the paint film on the outer surface of the equipment shall comply with the relevant stipulations of GB/T 1727. The surface shall be smooth; the sprayed coating shall be uniform, and free of flow marks, bubbles and peeling. 6.1.2 On the outer surface of the equipment, there shall be no obvious scratches; the welding joints shall be flat and smooth, and without processing burrs.
6.1.3 The positions of the various signs and plates pasted on the outer surface of the equipment shall be obvious; the pasting shall be firm.
The equipment shall be able to normally operate under a pressure of 1.2 MPa. No water leakage shall occur during the air-tightness inspection.
6.3 Start-up and Operation
6.13 Air Leakage Rate
Under the test conditions, for equipment with a nominal fresh air volume greater than 5,000 m3/h, the internal air leakage rate shall not be greater than 5%. 6.14 Noise
Under the test conditions, the measured value of ambient noise shall not be greater than the nominal value of the nameplate.
6.15 Electrical Safety
6.15.1 Insulation resistance
The cold-state and hot-state insulation resistance of the equipment shall not be less than 2 M.
6.15.2 Electric strength
The equipment shall manifest no breakdown or flashover.
6.15.3 Leakage current
The leakage current of the exposed metal parts of the equipment and the power cord shall not be greater than 10 mA.
6.15.4 Ground resistance
The equipment shall have a reliable grounding device, which is clearly marked; the grounding resistance shall not be greater than 0.1 .
6.15.5 Water-drenching insulation resistance
The water-drenching insulation resistance of the equipment shall comply with the relevant stipulations of GB 25131.
7 Test Methods
7.1 Test Conditions
7.1.1 The test conditions shall comply with the stipulations of Table 1. The static pressure shall be tested under the test conditions specified in 7.1.1 in accordance with the method specified in Appendix A of GB/T 21087-2020.
7.7 Cooling Power Consumption
While measuring the cooling capacity, in accordance with the method specified in Appendix A of GB/T 30192-2013, under the test conditions specified in 7.1.1, measure the input power of the equipment.
7.8 Rated Water Consumption Ratio of Cooling
Under the test conditions specified in 7.1.1, the ratio of the measured cooling capacity to the water consumption of the unit in the corresponding period of time. 7.9 Cooling Capacity of Direct Evaporative Cooling Section
Under the test conditions specified in 7.1.1, in accordance with the method specified in Appendix A of GB/T 30192-2013, measure the cooling capacity of the direct evaporative cooling section.
7.10 Cooling Capacity of Indirect Evaporative Cooling Section
Under the test conditions specified in 7.1.1, in accordance with the method specified in Appendix A of GB/T 30192-2013, measure the cooling capacity of the indirect evaporative cooling section.
7.11 Cooling Capacity
Under the test conditions specified in 7.1.1, in accordance with the method specified in Appendix A of GB/T 30192-2013, measure the algebraic sum of the cooling capacity of direct evaporative cooling section and the cooling capacity of indirect evaporative cooling section.
7.12 Maximum Load Condition
Under the maximum load condition specified in 7.1.1, start the equipment for continuous operation for 1 h, then, stop it for 3 min; re-start it for operation for 1h. 7.13 Minimum Load Condition
Under the minimum load condition specified in 7.1.1, start the equipment for continuous operation for 1 h, then, stop it for 3 min; re-start it for operation for 1 h. 7.14 Air Leakage Rate
The air leakage rate shall be tested in accordance with the method specified in Appendix C of GB/T 14294-2008.
the exit-factory inspection for the sampling inspection. The method of sampling shall comply with the relevant stipulations of GB/T 2828.1.
8.3.2 The sampling inspection shall be carried out item by item in accordance with the stipulations of Table 3.
8.4 Type Inspection
8.4.1 Under one of the following circumstances, type inspection shall be conducted: a) When new products are finalized, or old products are transferred to another factory for trial production;
b) When there are significant changes in product structure, manufacturing process or materials;
c) When the production has been suspended for over 1 year, then, resumed; d) When there are relatively significant differences between the exit-factory inspection result and the previous type inspection.
8.4.2 The samples that are qualified in the exit-factory inspection are randomly selected for the type inspection. The method of sampling shall comply with the stipulations of GB/T 2828.1.
8.4.3 The type inspection shall be carried out item by item in accordance with the stipulations of Table 3.
9 Marking, Packaging, Transportation and Storage
Each equipment shall have a plate fixed at an obvious position. The plate shall comply with the relevant stipulations of GB/T 13306 and shall at least be marked with the following contents:
a) Manufacturer’s name and trademark;
b) Product name, mark and model;
c) Basic performance parameters (overall dimensions, rated air volume, rated power, noise and voltage range, etc.);
d) Exit-factory date and exit-factory No.
9.2.1 The equipment shall be packed in accordance with the relevant stipulations of