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QC/T 1176-2022: Evaporator for automotive air conditioning
QC/T 1176-2022
QC
AUTOMOTIVE INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 43.040.60
CCS T 26
Evaporator for automotive air conditioning
ISSUED ON: APRIL 08, 2022
IMPLEMENTED ON: OCTOBER 01, 2022
Issued by: Ministry of Industry and Information Technology of the People's
Republic of China
Table of Contents
Foreword ... 6
1 Scope ... 7
2 Normative references ... 7
3 Terms and definitions ... 7
4 Technical requirements ... 8
5 Test methods ... 9
6 Inspection rules ... 13
7 Marks, packaging, transportation and storage ... 15
Evaporator for automotive air conditioning
1 Scope
This document specifies the technical requirements, test methods, inspection rules as
well as marking, packaging, transportation and storage of evaporator for automotive air
conditioning (referred to as the evaporator).
This document is applicable to the evaporator for automotive air conditioning that uses
HFC-134a and HFO-1234yf as refrigerants.
2 Normative references
The following referenced documents are indispensable for the application of this
document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
GB/T 191, Packaging and storage marks
GB/T 10125, Corrosion tests in artificial atmospheres - Salt spray tests
GB/T 21361, Motor vehicle air-conditioning unit
3 Terms and definitions
For the purposes of this document, the terms and definitions defined in GB/T 21361 as
well as the followings apply.
3.1 evaporator
A heat exchanger that cools the air by vaporization of the refrigerant.
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 refrigerating capacity
Operating under the specified test conditions, the heat in the air that is absorbed by the
evaporator per unit time.
3.4 air pressure drop
Operating under the specified test conditions, the pressure difference1 between the air
inlet surface and the air outlet surface of the evaporator.
3.5 refrigerant pressure drop
Operating under the specified test conditions, the pressure difference between the
refrigerant inlet and outlet in the evaporator.
4 Technical requirements
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 Refrigerating capacity, air pressure drop and refrigerant pressure drop
Test according to 5.2. The refrigerating capacity of the evaporator, the air pressure drop
and the refrigerant pressure drop shall meet the requirements negotiated and determined
by both parties.
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 0.5mm.
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
1 Pressures in this document are gauge pressures unless otherwise specified.
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
2.8 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. 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.
4.14 Temperature cycle
Carry out the test according to 5.14. The appearance of the product shall be free from
abnormal deformation or damage and meet the requirements of 4.3.2.
5 Test methods
5.1 Dimensional tolerance and appearance
Dimensional tolerances are checked with measuring tools. The appearance is detected
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 0.5 MPa±0.05 MPa. The pressure holding time is 1 min.
5.3.2 Air tightness test of water test
Seal one end of the evaporator inlet and outlet pipe. The other end is fed with dry air or
nitrogen. Place in water. The pressure reaches 1.5MPa±0.05MPa. Hold the pressure for
3 min.
5.4 Mass test of residual impurities in the inner cavity
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 8μm 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.
5.5 Cavity residual water test
Connect the evaporator inlet to the nitrogen tank. The outlet is connected to the inlet of
the trace moisture meter. Introduce nitrogen into the evaporator 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.
5.6 Pressure resistance test
One end of the inlet and outlet pipe of the evaporator 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 2.21 MPa ± 0.05 MPa. Hold the pressure for 3 min.
5.7 Burst pressure test
Evacuate the evaporator 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 2.8 MPa±0.05 MPa. Maintain 3 min. Then boost the pressure until it explodes.
Record the pressure value before the evaporator burst.
5.8 Vacuum resistance test
Seal one end of the evaporator'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
Each evaporator 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 one 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.