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This standard is developed in accordance with the rules given in GB/T 1.1-2009.
This standard replaces GB/T 23338-2009 Internal combustion engines - Charge air coolers - Specification. In addition to editorial changes, the following main technical changes have been made with respect to GB/T 23338-2009:
——terms and definitions of accuracy, precision and gauge pressure are deleted (see Clause 3 of Edition 2009);
——the clause of symbols and abbreviations is deleted (see Clause 4 of Edition 2009);
——the specified conditions and technical indexes in heat exchange efficiency are modified (see Sub-clause 4.6, Sub-clause 5.6 of Edition 2009);
——the technical indexes for vibration resistance are modified (see Sub-clause 4.7; Sub-clause 5.7 of Edition 2009);
——the technical indexes for pressure pulse resistance are modified (see Sub-clause 4.8; Sub-clause 5.8 of Edition 2009);
——the technical indexes for thermal shock resistance are modified (see Sub-clause 4.9; Sub-clause 5.9 of Edition 2009);
——the technical indexes and test methods for external corrosion resistance are added (see Sub-clauses 4.11 and 5.5);
——the technical indexes and test methods for drop hammer resistance test are added (see Sub-clauses 4.12 and 5.6);
——the measurement methods for trans-heat, resistance and heat exchange efficiency are modified (see Sub-clause 5.3; Sub-clause 6.3 of Edition 2009).
This standard was proposed by China Machinery Industry Federation.
This standard is under the jurisdiction of National Technical Committee on Internal Combustion Engines of Standardization Administration of China (SAC/TC 177).
The previous edition of this standard is as follows:
——GB/T 23338-2009.
Internal combustion engines - Charge air coolers - Specification
1 Scope
This standard specifies the terms and definitions, technical requirements, test methods, inspection rules, marking, packaging, transport and storage of charge air coolers of internal combustion engine.
This standard is applicable to charge air coolers of internal combustion engine (hereinafter referred to as intercoolers) for automobiles, tractors and construction machinery. Other charge air coolers of internal combustion engine can also be used for reference.
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 2423.17 Environmental testing for electric and electronic products - Part 2: Test methods - Test Ka: Salt mist
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 3821 Small and medium power internal combustion engines - Cleanliness limits and measurements
JB/T 10408 Internal combustion engines - Heat exchangers - Reliability test method
JB/T 11798 Internal combustion engines - Heat exchangers - Wind tunnel test equipments
3 Terms and definitions
For the purposes of this document, the terms and definitions given in JB/T 11798 and the following apply.
3.1
fronted area
the area of the windward side of the intercooler core where the cooling medium is air
3.2
heat exchange efficiency
the ratio of the actual heat exchange of the intercooler to the maximum possible heat exchange under the same conditions
3.3
hot side
the channel of the charge air in the intercooler
3.4
cold side
the channel of the cooling medium (cooling water or air) in the intercooler
3.5
water cooling type
a type of intercooler that uses water as the cooling medium
3.6
air cooling type
a type of intercooler that uses air as the cooling medium
3.7
standard air
the air at a temperature of 20℃ and under the pressure of 101.3 kPa
4 Technical requirements
4.1 General
The intercooler shall be manufactured according to the product drawings and technical documents approved by the prescribed procedures, and shall meet the requirements of this standard.
4.2 Airtightness
4.2.1 The hot side of the intercooler shall be sealed, and shall be free of leakage after dry compressed air not less than 1.5 times the working pressure and not less than 200 kPa is introduced and the pressure is maintained for 1 min.
4.2.2 The cold side of the water cooling type intercooler shall be sealed, and shall be free of leakage after dry compressed air not less than 350 kPa is introduced and the pressure is maintained for 1 min.
4.3 Hot side cleanliness
The hot side cleanliness of the intercooler is expressed as the impurity mass Wc cleaned from the hot side surface of each intercooler, and Wc shall be calculated according to Formula (1):
Wc≤a+bFh (1)
where,
a——the empirical constant, taken as 10 mg;
b——the empirical constant, taken as 25 mg/m2;
Fh——the heat transfer area of hot side, m2.
4.4 Trans-heat
The trans-heat of the intercooler shall meet the requirements of the product drawing or supply agreement. In comparison, the actual trans-heat of the charge air under the test conditions shall be converted into the converted trans-heat.
4.5 Resistance
The resistance of medium flowing through the intercooler shall conform to the requirements of product drawings or supply agreements, and the cold side resistance of the air cooling type intercooler shall be corrected to the standard air condition according to Formula (2) for comparison:
(2)
where,
Δp′a——the cold side under standard air condition, kPa;
P——the absolute atmospheric pressure during test, kPa;
t——the ambient temperature during test, ℃;
Δpa——the measured resistance on the cold side, kPa.
4.6 Heat exchange efficiency
4.6.1 Air cooling type intercooler
The heat exchange efficiency of the air cooling type intercooler shall meet those specified in Table 1.
Table 1 Heat exchange efficiency of air cooling type intercooler
Test medium Parameter Diesel engine Gasoline engine (≤200 kW)
Specified conditions Heat exchange efficiency Specified conditions Heat exchange efficiency
Charge air Inlet temperature/℃ Room temperature +150 ≥83 Room temperature +125 ≥80
Inlet pressure/kPa 200 150
Hot side resistance/kPa 10 10
Cooling air Inlet temperature/℃ Room temperature Room temperature
Cold side resistance under standard air condition/kPa 0.200 0.300
4.6.2 Water cooling type intercooler
The heat exchange efficiency of the water cooling type intercooler shall meet those specified in Table 2.
Table 2 Heat exchange efficiency of water cooling type intercooler
Test medium Parameter Diesel engine Gasoline engine (≤200 kW)
Specified conditions Heat exchange efficiency Specified conditions Heat exchange efficiency
Charge air Inlet temperature/℃ 180 ≥87 150 ≥90
Inlet pressure/kPa 200 150
Hot side resistance/kPa 10 7
Cooling water Inlet temperature/℃ 60 50
Cold side resistance/kPa 30 30
4.7 Vibration resistance
Fill the intercooler with working medium, and fix it on the vibration test stand according to the installation mode during operation. Fix the control sensor on the vibration test stand and the vibration direction is vertical. Make it vibrate according to the requirements of Table 3 for 3 h. Without leakage and damage of parts, the intercooler shall meet the requirements for airtightness in Sub-clause 4.2 after the test.
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Technical requirements
5 Test methods
6 Inspection rules
7 Marking, packaging, transport and storage
Annex A (Informative) Original record of neutral salt spray test
