This standard specifies the types and basic parameters of oil-injected screw single-stage refrigeration compression condensing units. This standard applies to oil-injected screw single-stage refrigeration compression condensing units using R12, R22, and R717 as refrigerants. JB/T 5145.1-1991 Types and basic parameters of oil-injected screw single-stage refrigeration compression condensing units JB/T5145.1-1991 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
Types and basic parameters of oil-injected screw single-stage refrigeration compression condensing units
1 Subject content and scope of application
This standard specifies the types and basic parameters of oil-injected screw single-stage refrigeration compression condensing units. JB 5145.1—91
This standard applies to oil-injected screw single-stage refrigeration compression condensing units (hereinafter referred to as "units") using R12, R22, and R717 as refrigerants.
2 Reference standards
ZBJ73025 Method for compiling refrigeration machine models
ZBJ73030 Types and basic parameters of oil-injected screw single-stage refrigeration compressors 3 Types
3.1 Unit structure type
3.1.1 According to the structure of the compressor, the unit can be divided into open type and semi-closed type. 3.1.2 According to the cooling method of the condenser, the unit can be divided into water-cooled type and air-cooled type. 3.2 Unit model representation method
The unit model consists of uppercase Chinese pinyin letters and Arabic numerals, and its representation method is as follows: NJ
Remodel number: Indicated by numbers, omitted for the first design product Nominal working condition type: G indicates high temperature nominal working condition, Z indicates medium temperature nominal working condition, D indicates low temperature nominal working condition
Equipped motor power: Indicated by numbers, unit is kw Refrigerant: F indicates R12, R22; A indicates R717; Semi-closed type does not indicate Cooling method: F indicates air-cooled type, water-cooled type does not indicate Compressor type: LG indicates open screw type, BLG indicates semi-closed screw type - compression condensing unit code
Model indication example:
a. NJLGFA 200D2
Using ammonia (R717) as refrigerant, equipped with a motor power of 200kW, used for low temperature nominal conditions, the second modified air-cooled open screw type single-stage refrigeration compression condensing unit.
b.NJBLG 55G
Using Freon (R12, R22) as refrigerant, equipped with a motor power of 55kW, used for high temperature conditions, water-cooled semi-closed screw type single-stage Ministry of Machinery and Electronics Industry of the People's Republic of China approved on July 22, 1991 and implemented on July 1, 1992
Refrigeration compression condensing unit.
4 Basic parameters
4.1 The nominal conditions of the unit are specified in the following table. Suction temperature
JB 5145.1—91
Air inletbzxZ.net
Dry bulb temperature
Condenser cooling method
Water inlet temperature
Thermal resistance coefficient of fouling on the water side of heat transfer tubes of condenser in water-cooled unit under nominal working conditions: steel pipe
0.172m2.C/kw
0.086 m2 . C/kw
Water outlet temperature
Ambient temperature
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