This standard specifies the product classification, technical requirements, test methods, inspection rules, marking, packaging and transportation of dry evaporators for Freon refrigeration devices (hereinafter referred to as evaporators). This standard applies to evaporators for air conditioning conditions that are supplied separately and use R22 as refrigerant and water as coolant. JB/T 7659.4-1995 Dry evaporators for Freon refrigeration devices JB/T7659.4-1995 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
Dry Evaporator for Freon Refrigeration Device
1 Subject Content and Scope of Application
JB/T7659.4-95
This standard specifies the product classification, technical requirements, test methods, inspection rules, marking, packaging and transportation of dry evaporators for Freon refrigeration devices (hereinafter referred to as evaporators).
This standard applies to separately supplied evaporators for air-conditioning conditions with R22 as refrigerant and water as coolant. 2 Reference standards
GB/T13306 Label
Technical conditions for grey iron castings for refrigeration compressors JB/T6421
JB/T 6917
ZB J73 029
3 Product classification
3.1 Type
Pressure vessels for refrigeration equipment
Cleanliness determination method for tubular heat exchangers for refrigeration equipment The type of evaporator is horizontal shell and tube type.
3.2 Model
3.2.1 Model Indication Method
The model of the evaporator consists of uppercase Chinese phonetic 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 design product Evaporator heat exchange tube surface area: Indicated by numbers, m2-Working condition code: R is used for heat pump working condition, and not indicated for refrigeration working condition Dry evaporator codebzxZ.net
3.2.2 Model Example
GZR20: The surface area of ​​the heat exchange tube is 20m2, used for heat pump working condition, and the dry evaporator designed for the first time. GZ20-1: The surface area of ​​the heat exchange tube is 20m2, used for refrigeration working condition, and the dry evaporator of the first retrofit. 3.3 Basic Parameters
3.3.1 Thermal Parameters
The heat transfer coefficient of the evaporator under nominal temperature and heat pump working condition shall be in accordance with the provisions of Table 1. Approved by the Ministry of Machinery Industry on June 16, 1995
Implemented on July 1, 1996
Heat transfer coefficient
3.3.2 Nominal operating conditions
The nominal operating conditions of the evaporator shall comply with the provisions of Table 2.
Outlet water temperature tm2
Inlet and outlet water temperature difference △t
Water pressure loss Ap
Fouling coefficient
Refrigerant side
Average water velocity between tubes
3.4 ​​Design conditions
JB/T7659.4--95
≥800
The design conditions of the evaporator shall comply with the provisions of Table 3. Item
Design pressure,
Design temperature,
Technical requirements
General requirements
Refrigerant side (tube side)
Water side (shell side)
Freon side (tube side)
Refrigeration conditions
Refrigeration conditions
≥1 000
Heat pump conditions
Heat pump conditions
The evaporator shall comply with the provisions of this standard and be manufactured according to the drawings and technical documents approved by the prescribed procedures, or it may be manufactured according to the agreement between the user and the manufacturer.
4.2 Materials
The materials used for the evaporator shell, tube sheet and tube side shall be accompanied by material certificates. The materials shall comply with the provisions of JB/T6917. The gray cast iron parts for evaporators shall refer to the relevant standards such as JB/T6421. 4.3 Cold and hot processing
The cold and hot processing of the evaporator shall comply with the provisions of JB/T6917. 4.4 Welding and flaw detection
The welding and non-destructive flaw detection of the evaporator shall comply with the provisions of JB/T6917. 4.5 Parts and components
The parts and components such as the cylinder, support, tube sheet, tube or tube bundle of the evaporator shall comply with the provisions of JB/T6917. 4.6 Pressure resistance and airtightness test
The evaporator shall be subjected to pressure and airtightness test, and its requirements shall comply with the relevant provisions of JB/T6917. 1480
4.7 Cleanliness
JB/T7659.4—95
The inside of the evaporator should be clean, and the impurity content of the surface in contact with the refrigerant should not exceed 300mg/m2.4.8 Appearance quality
The evaporator 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 there should be no defects that affect the appearance. 4.9 Completeness
4.9.1 The evaporator supplied as a complete set should include: a.
Refrigerant inlet joint,
Refrigerant outlet joint;
Children's water inlet connection assembly flange or connection nut, chilled water outlet joint;
Refrigerant, chilled water inlet and outlet connection assembly flange or connection nut. 4.9.2
According to the design requirements, the evaporator may also include: a.
Water drain joint,
Temperature measurement interface;
Support or saddle.
4.10 Warranty period
If the user complies with the provisions of the product manual, within 18 months from the date of shipment from the manufacturer, if the evaporator 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 of the evaporator can be carried out by industrial operation test. 5.2 Nondestructive testing
The method of nondestructive testing of the evaporator shall comply with the provisions of JB/T6917. 5.3 Pressure resistance and air tightness test
The pressure and air tightness test method of the evaporator shall comply with the provisions of JB/T6917. 5.4 Cleanliness determination
The cleanliness determination of the evaporator can refer to the provisions of 2BJ73029. 5.5 Gas filling protection
After the test, the remaining water in the evaporator should be drained and dried to ensure that there is no water vapor in the evaporator. The evaporator shipped alone should be filled with positive pressure dry nitrogen or specially treated dry air (dew point below 30℃), the maximum pressure should not exceed 0.1MPa, and it should be sealed immediately.
5.6 Test methods and test safety precautions are shown in JB/T6917. 6 Inspection rules
General requirements
The evaporator should be inspected by the technical inspection department of the manufacturer according to this standard and technical documents, and can only be shipped after passing the inspection. 6.2 Inspection items
6.2.1 Inspection classification
The inspection of the evaporator is divided into two categories: factory inspection and type inspection. 6.2.2 Inspection items
The inspection items of the evaporator should be in accordance with the provisions of Table 4. 1481
Performance test
Inspection items
Cleanliness (refrigerant side)
Main parts and components material report
Processing quality
Appearance quality
Pressure resistance and air tightness test
Product completeness
Product label content and factory documents
6.3 Factory inspection
Each evaporator shall be inspected after manufacture. 6.4 Type inspection
JB/T7659.4-95
Factory inspection
6.4.1 For at least one specification of evaporator, new products or old products that have undergone major reforms shall be inspected by type. 6.4.2 The test method of performance test can adopt industrial test. Marking, packaging and transportation
7.1 Marking
Type inspection
The evaporator should be fixed with a label on a conspicuous and flat part. The label should comply with the provisions of GB/T13306. The content of the label should include: model, name and factory number:
design temperature and design pressure;
refrigerant used;
maximum working (parking) pressure
test pressure;
heat exchange area:
manufacturer's name and trademark;
weight,
manufacturing date.
7.2 Packaging and transportation
All pipes of the evaporator should be properly sealed, and the exposed ferrous metal without coating protection should be coated with rust inhibitor. The packaging and transportation of evaporators shipped separately can refer to the provisions of JB/T6917. The factory documents of the evaporator can refer to the provisions of JB/T6917. The evaporator shipped separately should also provide product instructions and packaging. 7.2.2
Additional instructions:
This standard was proposed and managed by the Hefei General Machinery Research Institute of the Ministry of Machinery Industry. This standard was drafted by Shenyang No. 1 Refrigeration Factory. The main drafter of this standard is Zhang Yongyao.
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