GB/T 39976-2021Evaporation cooling outdoor air conditioning equipment (English PDF)

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.

5.2 Components

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 Structure

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.

6.1 Appearance

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.

6.2 Air-tightness

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 Mohm.

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 ohm.

6.15.5 Water-drenching insulation resistance

The water-drenching insulation resistance of the equipment shall comply with the relevant stipulations of GB 25131.

7.1 Test Conditions

7.1.1 The test conditions shall comply with the stipulations of Table 1.

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.

7.15 Noise

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.

9.1 Marking

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 Packaging

9.2.1 The equipment shall be packed in accordance with the relevant stipulations of […]