QC/T 1177-2022Condenser for automotive air conditioning (English PDF)

3.1 Condenser

A heat exchanger that cools and condenses gaseous refrigerant into a liquid state.

3.2 Stable state

During the test, the state that the fluctuation range of the relevant test parameters is less than the specified value.

3.3 Heat exchange

Operating under the specified test conditions, the heat dissipated into the air by the condenser per unit time.

3.4 Air pressure drop

Operating under the specified test conditions, the pressure difference between the air inlet surface and the air outlet surface of the condenser.

3.5 Refrigerant pressure drop

Operating under the specified test conditions, the pressure difference between the refrigerant inlet and outlet of the condenser.

3.6 Subcooling condenser

A heat exchanger that cools the high-temperature and high-pressure gaseous refrigerant entering the condenser into a high-temperature and high-pressure liquid refrigerant, and the liquid refrigerant at the outlet of the condenser has a certain degree of subcooling.

4.1 Dimensional tolerance and appearance requirements

Inspect according to 5.1. The dimensional tolerance and appearance requirements of the product shall comply with the agreement between the supplier and the purchaser.

4.2 Heat exchange, air pressure drop and refrigerant pressure drop

Test according to 5.2. The air side heat exchange, refrigerant side heat exchange, air pressure drop and refrigerant pressure drop of the condenser shall be in accordance with the agreement between the supplier and the purchaser.

4.3 Airtight performance

4.3.1 Airtight performance of helium test

Carry out airtight performance test of helium test according to 5.3.1. The helium leakage rate of the product shall not be greater than 1×10-3 Pa·L/s (refrigerant equivalent leakage rate is 2 g/y).

4.3.2 Airtight performance of water test

Carry out airtight performance test of water test according to 5.3.2. The product shall be free of air bubbles.

4.4 Residual impurities in the inner cavity

Carry out the test according to 5.4. The mass of residual impurities in the product cavity shall not exceed 20 mg/m². The diagonal outer diameter of particles shall not be greater than 0.2 mm.

4.5 Residual water amount in the inner cavity

Carry out the test according to 5.5. The residual water amount in the inner cavity of the product shall not exceed 40 mg/m².

4.6 Pressure resistance

Carry out the test according to 5.6. The product shall be free from damage and abnormal deformation and meet the requirements of 4.3.2.

4.7 Burst pressure

Carry out the test according to 5.7. The product shall not break under the pressure of 8.8 MPa.

4.8 Vacuum resistance

Carry out the test according to 5.8. The product shall be free from leakage, damage and abnormal deformation. The pressure rise rate after the test shall not exceed 0.5 kPa/min.

4.9 Pressure alternating performance

Carry out the test according to 5.9. The product shall have no abnormal deformation or crack and meet the requirements of 4.3.2.

4.10 Vibration resistance

Carry out the test according to 5.10. The product shall be free from looseness, damage and leakage and meet the requirements of 4.3.2.

4.11 Corrosion resistance

Carry out the test according to 5.11.1. The heat pump type air-cooled condenser in the vehicle shall be tested according to 5.11.2. The outer surface of the product shall be free of air bubbles or peeling off and meet the requirements of 4.3.2.

4.12 High temperature storage

Carry out the test according to 5.12. The appearance of the product shall be free from abnormal deformation or damage and meet the requirements of 4.3.2.

4.13 Low temperature storage

Carry out the test according to 5.13. The appearance of the product shall be free from abnormal deformation or damage and meet the requirements of 4.3.2.

5.3 Air tightness test

5.3.1 Air tightness test of helium test

Use vacuum box type helium leak detection equipment. Fill the cavity with helium at a pressure of 0.8 MPa. The pressure holding time is 1 min.

5.3.2 Air tightness test of water test

Seal one end of the condenser inlet and outlet pipe. The other end is fed with dry air or nitrogen. Hold the pressure at 3.5 MPa ± 0.1 MPa. Place the product in water. The test time is 3 min.

5.4 Mass test of residual impurities in the inner cavity

5.4.1 Inject about 60% of the volume of isooctane into the inner cavity of the tested product. Shake up and down, left and right, and back and forth 4~5 times. Then recover the dissolved matter in a special container. Filter and dry with 8 µm filter paper.

Determine the mass of residual material. Use industrial analytical tools to measure. The measurement accuracy is ±0.1 mg. Particle size is measured microscopically.

5.4.2 If the condenser is equipped with a filter drying bag, it shall be removed before the test.

5.5 Cavity residual water test

5.5.1 Connect the condenser inlet to the nitrogen tank. The outlet is connected to the inlet of the trace moisture meter. Introduce nitrogen into the condenser at a rate of 70 mL/min ± 20 mL/min. When the fluctuation of the test value does not exceed 0.1 mg and lasts for more than 3 min, read the residual water amount as the test result. The accuracy of the trace moisture meter is ±0.05 mg.

5.5.2 If the condenser is equipped with a filter drying bag, it shall be removed before the test.

5.6 Pressure resistance test

One end of the inlet and outlet pipe of the condenser is sealed. The other end is passed into water or hydraulic oil to pressurize. Pressurize at a rate of 1 MPa/min ± 0.5 MPa/min to 4.41 MPa ± 0.05 MPa. Hold the pressure for 3 min.

5.7 Burst pressure test

Evacuate the condenser first. Seal one end of the inlet and outlet pipe. The other end is introduced to water or hydraulic oil. Pressurize at a rate of 1 MPa/min ± 0.05 MPa/min to 8.8 MPa ± 0.05 MPa. Maintain 3 min. Then boost the pressure until it explodes. Record the pressure value before the condenser burst.

5.8 Vacuum resistance test

Seal one end of the condenser's inlet and outlet pipe. The other end is evacuated to 2 kPa. Conduct 3 consecutive times. Maintain 5 min each time.

5.9 Pressure alternating performance test

Carry out alternating pressure test according to the requirements of Table 3. The test medium is hydraulic oil.

5.10 Vibration resistance test

5.10.1 Test preparation

According to the actual vehicle installation status, install the condenser on the vibration test bench.

5.10.2 Resonance frequency testing

5.10.2.1 Set the vibration frequency to 8.3 Hz ~ 200 Hz. The vibration acceleration is set to 9.8 m/s2. Carry out vibration test in up and down direction. The test time does not exceed 20 min.

5.10.2.2 If at a certain frequency, the measured acceleration is more than twice the input acceleration, then this frequency is the resonance frequency. For products with no resonant frequency detected, carry out the vibration resistance performance test according to 5.10.3. For the products whose resonant frequency is measured, carry out the vibration resistance performance test according to 5.10.4.

5.10.3 Vibration resistance performance test without resonance point

Set the vibration frequency to 33.3 Hz. The vibration acceleration is set to 32.3 m/s2.

Vibrate 7.5 × 105 times in the up and down direction. Vibrates 2.5 × 105 times along the front and back.

5.10.4 Vibration resistance performance test with resonance point

5.10.4.1 According to the resonance frequency range, complete the corresponding vibration test according to the requirements in Table 4.

5.10.4.2 If there is more than one resonant frequency range, the samples for vibration tests of different frequency ranges may not be the same sample.

5.10.4.3 After the test under the conditions specified in Table 4, the test without resonance frequency as described in 5.10.3 shall be carried out.

5.11 Corrosion resistance test

5.11.1 Acid salt spray test

Put the condenser into the salt spray corrosion test chamber. Carry out the salt spray test according to the test method of acetic acid salt spray test (AASS test) in GB/T 10125. The test time is 500 h.

5.11.2 Neutral salt spray test

Put the condenser into the salt spray corrosion test chamber. According to the provisions of GB/T 10125, carry out 480 h neutral salt spray corrosion test.

5.12 High temperature storage test

Place at 120 °C ± 3 °C for 72 h. Recover to normal temperature.

5.13 Low temperature storage test

Place at -40 °C ± 3 °C for 72 h. Recover to normal temperature.

5.14 Temperature cycle test

Test according to Figure 1. Complete 10 temperature cycles. After the test, the samples are left at room temperature for 20 min.

6.1 Inspection classification

6.1.1 Exit-factory inspection

Each condenser shall be exit-factory inspected. The inspection items, technical requirements and test methods shall be carried out according to Table 5.

6.1.2 Type inspection

6.1.2.1 Type inspection conditions

Type inspection shall be carried out under the following conditions. The inspection items are carried out according to Table 5:

a) When product development is approved;

b) When there are major changes in the design, process, materials of the product;

c) When the production that has been discontinued for 1 year is resumed;

d) When the quality is unstable, and it is deemed necessary;

e) When it is required by the quality supervision department;

f) After normal mass production, when the time interval from the previous type inspection exceeds 1 year.

6.1.2.2 Type inspection method

Samples are randomly selected from the products that have passed the exit-factory inspection. The same product is allowed to participate in multiple tests that do not affect its technical requirements.

7.1.2 Product mark content

The mark shall include the following:

a) Name or trademark of the manufacturer;

b) Product model;

c) Refrigerant type;

d) Production date or production batch number;

e) Recyclability sign.

7.2 Packaging, transportation

7.2.1 Product packing box

The following content shall be marked on the outside of the product package:

a) Name and address of the manufacturer;

b) Product name, model and quantity;

c) Production date, production batch number or its code;

d) Mass (total mass);

e) Dimensions of the packing box.

7.2.2 Marks

The packaging shall have marks such as "Handle with care", "Up" and "Afraid of wetness". The marks shall comply with the relevant provisions of GB/T 191.

7.2.3 Certificate of conformity

Products shall have a certificate of conformity.

7.2.4 Product packaging and shipping method

Product packaging and transportation shall have reliable dust-proof, moisture-proof and shock-proof measures. Guarantee that the product will not be loosened or damaged during normal transportation.

7.3 Storage

The product shall be stored in a well-ventilated and dry environment.