This standard specifies the product classification, technical requirements, test methods, inspection rules, marking, packaging and transportation of water-cooled condensers (hereinafter referred to as condensers) for Freon refrigeration devices. This standard applies to condensers supplied separately with R12 (R134a) and R22 as refrigerants and with a nominal surface area of ​​the condenser heat exchange tube not exceeding 200m2. JB/T 7659.2-1995 Water-cooled condensers for Freon refrigeration devices JB/T7659.2-1995 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
Water-cooled condensers for Freon refrigeration units
1 Subject content and scope of application
JB/T 7659.2--95
This standard specifies the product classification, technical requirements, test methods, inspection rules, marking, packaging and transportation of water-cooled condensers for Freon refrigeration units (hereinafter referred to as condensers). This standard applies to separately supplied condensers using R12 (R134a) and R22 as refrigerants and with a nominal surface area of ​​condenser heat exchange tubes not exceeding 200 m2.
2 Reference standards
GB 1226
GB12241
General pressure gauge
Safety valve
GB/T13306 Label
JB/T 6421
JB/T 6917
JB/T 6918
General requirements
Technical conditions for grey iron castings for refrigeration compressorsPressure vessels for refrigeration equipment
Metal and glass sintered level gauges and sight glasses for refrigerationZB J73 029
Method for determination of cleanliness of tubular heat exchangers for refrigeration equipmentZBJ73042
3 Product classification
3.1 Type
Pressure and pressure differential controllers for refrigeration
There are two types: sleeve type and shell and tube type (horizontal). 3.2 Model
3.2.1 Model indication method
The model of the condenser consists of uppercase Chinese pinyin letters and Arabic numerals (hereinafter referred to as numbers), and the model indication method is as follows: -Retrofit number: Indicated by numbers, omitted for the first designed product Nominal condensing area: Based on the surface area of ​​the heat exchange tube, expressed by numbers, accurate to the unit place (the shell and tube type is accurate to the tenth place), m2
Applicable refrigerant: R12 (R134a) is represented by 12, and R22 is represented by 22. 3.2.2 Model example
Condenser code: Shell and tube condenser is represented by TN, and horizontal shell and tube condenser is represented by WN. WN22-8: Indicates that the nominal surface area of ​​the heat exchange tube is 8m\, and it is a horizontal shell and tube condenser designed for the first time with R22 as the refrigerant. Approved by the Ministry of Machinery Industry on June 16, 1995
Implemented on July 1, 1996
3.3 Basic parameters
3.3.1 Thermal parameters
JB/T7659.2-95
The heat transfer coefficient of the condenser under nominal conditions shall be as specified in Table 1. Table 1
Cooling method
3.3.2 Nominal conditions
R12 (R134a)
Shell and tube
Tube-tube
The nominal conditions of the condenser shall be as specified in Table 2. Item
Inlet water temperature t1
Inlet and outlet water temperature difference
Condensing temperature
Fouling coefficient
Water pressure lossbzxz.net
3.4 ​​Design conditions
Refrigerant side
The design pressure of the condenser shall be as specified in Table 3. Item
Design pressure
Maximum condensing temperature
Design temperature
4 Technical requirements
General requirements
m\℃/W
R12(R134a)
R12(R134a)
R12(R134a)
≥900
Heat transfer coefficient K
W/(m2.℃)
≥1 000
≥1 200
0. 000 00
Copper tube 0.00008
Steel tube 0.00017
Condensers shall comply with the provisions of this standard and be manufactured according to the drawings and technical documents approved through the prescribed procedures. They may also be manufactured according to the agreement between the user and the manufacturer.
4.2 Materials
4.2.1 The materials used to manufacture the main pressure-bearing components of the condenser shall have a material certificate. 4.2.2 The materials used for the condenser shall comply with the provisions of JB/T6917. 1168
4.3 Gray cast iron parts
JB/T 7659.2--95
Gray cast iron parts refer to the relevant provisions of JB/T6421. 4.4 Cold and hot processing
The cold and hot processing of the condenser shall comply with the provisions of JB/T6917. 4.5 Welding and flaw detection
The welding and non-destructive flaw detection of the condenser shall comply with the provisions of JB/T6917. 4.6 Test plates and test specimens
The test plates and test specimens of the condenser shall comply with the provisions of JB/T6917. 4.7 Parts and components
The parts and components of the condenser such as the cylinder, support, tube sheet, tube or tube bundle shall comply with the provisions of JB/T6917. 4.8 Safety accessories
In addition to complying with the provisions of JB/T6917, the safety accessories of the condenser shall also comply with the following provisions: the overpressure relief device shall comply with the provisions of GB12241 and relevant standards; a.
The high-pressure cut-off device shall comply with the provisions of ZBJ73042; b.
The liquid level gauge and sight glass shall comply with the provisions of JB/T6918; the pressure gauge shall comply with the provisions of GB1226.
4.9 Pressure resistance and airtightness requirements
The condenser shall be subjected to pressure test and airtightness test, and the requirements shall comply with the provisions of JB/T6917. 4.10 Cleanliness
The interior of the condenser should be clean and dry, and the impurity content of the surface in contact with the refrigerant should not exceed 3001g/m2.4.11 Appearance quality
The condenser should be beautiful and elegant, and the weld surface should be free of cracks, pores, arc pits and slag inclusions. The outer surface should be painted, and the paint layer should be uniform and smooth, with consistent color, and should not have defects that affect the appearance. 4.12 Completeness
The shell and tube condenser supplied in a complete set should include:4. 12. 11
Refrigerant inlet and outlet joints,
Cooling water inlet and outlet joints;
Safety device joints and safety devices:
Refrigerant inlet and outlet connection assembly flange or pipe nut; support or saddle.
2The complete set of shell-and-tube condensers shall include: 4.12.2
Refrigerant inlet and outlet joints,
Cooling water inlet and outlet joints,
Bracket.
4.13 Warranty period
If the user complies with the provisions in the product manual, within 18 months from the date of shipment from the manufacturer, if the condenser is damaged or fails to work properly due to poor manufacturing quality, the manufacturer shall replace or repair it free of charge. 5 Test method
5.1 Performance test
The performance test method of the condenser can be industrial operation test. 5.2 Nondestructive testing
The method of nondestructive testing of condensers shall comply with the provisions of JB/T6917. 1469
5.3 Pressure and air tightness test
JB/T7659.2—95
The pressure and air tightness test methods of the condenser shall comply with the provisions of JB/T6917. 5.4 Cleanliness determination
The cleanliness determination of the condenser may refer to the provisions of ZBJ73029. 5.5 Gas filling protection
At the end of the test, the remaining water in the condenser shall be drained and dried to ensure that there is no water vapor in the condenser. The condenser shipped separately shall be filled with positive pressure dry nitrogen or specially treated dry air (with a dew point below -30°C), with a maximum pressure not exceeding 0.1MPa, and immediately sealed.
6 Inspection rules
6.1 General requirements
The condenser shall be inspected by the technical inspection department of the manufacturer in accordance with this standard and technical documents, and can be assembled or shipped only after passing the inspection. 6.2 Inspection items
6.2.1 Inspection classification
The inspection of condensers is divided into factory inspection and type inspection. 6.2.2 Inspection items
The inspection items of condensers shall be in accordance with the provisions of Table 4. Table 4
Inspection items
Performance test
Cleanliness
Material report of pressure-bearing components
Processing quality
Quality of cast iron parts
Appearance quality
Non-destructive testing report
Pressure test, airtightness test
Complete set of products
Contents of product label and factory documents
6.3 Factory inspection
Each condenser shall be subjected to factory inspection after manufacture. 6.4 Type inspection
Factory inspection
6.4.1 For condensers of at least 100 specifications, new products or old products that have undergone major reforms should be subject to type inspection. 6.4.2 The performance test method can adopt industrial operation test. 7 Marking, packaging and transportation
7.1 Marking
Type inspection
A label should be fixed on the condenser in an obvious and flat position. The label should comply with the provisions of GB/T13306. The content marked on the label can refer to the provisions of 1470
JB/T 6917.
7.2 Packaging and transportation
JB/T 7659.2-95
7.2.1 All pipes of the condenser should be properly sealed. The exposed ferrous metal parts without coating protection should be coated with rust inhibitor. The packaging and transportation of the condenser shipped separately can refer to the provisions of JB/T6917. 7.2.2 The factory documents of the condenser can refer to the provisions of JB/T6917. The condenser shipped separately should also provide product instructions and packing lists.
Additional instructions:
This standard was proposed and approved by the Hefei General Machinery Research Institute of the Ministry of Machinery Industry. This standard was drafted by Shanghai Air Conditioner Factory and Nanjing Wuzhou Refrigeration (Group) Company. The main drafters of this standard are Shen Hesheng and Mao Yongnian.
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