Centrifugal refrigerant compressors
1 Scope
This standard specifies the terms and definitions, types and basic parameters, requirements, tests, inspection rules, marking, packaging, transportation and storage of centrifugal refrigerant compressors and centrifugal refrigerant compressor units.
This standard is applicable to centrifugal refrigerant compressors [hereinafter referred to as "compressor(s)"] and centrifugal refrigerant compressor units [hereinafter referred to as "compressor unit(s)"] for air conditioning purposes, and centrifugal refrigerant compressors and centrifugal refrigerant compressor units for other purposes may refer to this standard.
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 documents (including any amendment) applies.
GB/T 191 Packaging — Pictorial marking for handling of goods
GB/T 5773 The method of performance test for positive displacement refrigerant compressors
GB 6388 Transport package shipping mark
GB 9237 Mechanical refrigerating systems used for cooling and heating — Safety requirements
GB/T 9239.1-2006 Mechanical vibration — Balance quality requirements for rotors in a constant (rigid) state — Part 1: Specification and verification of balance tolerances
GB/T 13306 Plates
GB/T 18430.1 Water chilling (heat pump) packages using the vapor compression cycle — Part 1: Water chilling(heat pump) packages for industrial & commercial and similar application
GB/T 19410 Screw refrigerant compressors
JB/T 3165-1999 Thermodynamic performance test for centrifugal & axial blower and compressor
JB/T 7249 Terminology of refrigeration equipment
3 Terms and definitions
For the purposes of this standard, the terms and definitions given in JB/T 7249 and the following apply.
3.1
centrifugal refrigerant compressor
compressor that works on refrigerant vapour via impeller to increase the pressure and velocity of the refrigerant vapour, and then converts kinetic energy into pressure energy in the diffuser, driving the refrigerant vapour through the impeller in the radial direction
3.2
centrifugal refrigerant compressor unit
unit assembled with centrifugal refrigerant compressor, prime mover and other accessories for compressing refrigerant vapour
3.3
surging
instability phenomenon during the operation of a compressor (unit), characterized by the large fluctuation of refrigerant vapour flow with time, accompanied by strong vibration and noise
3.4
choking
instability phenomenon during the operation of a compressor (unit), characterized by aerodynamic blockage, where the refrigerant vapour flow no longer increases with the action of the regulating mechanism
3.5
refrigeration capacity
measured mass flow of refrigerant flowing through the evaporator in refrigeration cycle of the compressor (unit) multiplied by the difference between the specific enthalpy of refrigerant gas at compressor (unit) suction port and that of refrigerant liquid before evaporator expansion in refrigeration cycle of the compressor (unit) under the specified refrigerating capacity test conditions, expressed in watts (W)
3.6
heating capacity
measured mass flow of refrigerant flowing through the exhaust side of the compressor (unit) multiplied by the difference between the specific enthalpy of refrigerant gas at compressor (unit) exhaust port and that of refrigerant liquid before evaporator (air compensating circuit) expansion in refrigeration cycle of the compressor (unit) under the specified heating capacity test conditions, expressed in watts (W)
3.7
cooling (heating) coefficient of performance
ratio of refrigeration (heating) capacity of compressor (unit) to input power, expressed in watts per watt (W/W)
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Types and basic parameters
4.1 Types
4.2 Pressure and flow ranges of compressor (unit) under normal operation
4.3 Nominal conditions
5 Requirements
5.1 General requirements
5.2 Safety requirements
5.3 Performance requirements
6 Tests
6.1 General requirements for test
6.2 Test methods
7 Inspection rules
7.1 End-of-manufacturing inspection
7.2 Sampling inspection
7.3 Type inspection
8 Marking, packaging, transportation and storage
8.1 Marking
8.2 Packaging
8.3 Transportation and storage
Annex A (Informative) Requirements for arrangement of pressure and temperature measuring points and pipe components in refrigeration (heating) capacity tests of compressor (unit)
A.1 General
A.2 Requirements for arrangement of suction and exhaust pressure and temperature measuring points
A.3 Requirements for arrangement of straight pipes in suction and exhaust pipelines
Annex B (Informative) Technical requirements for rectifiers for compressor (unit) performance test device purpose
B.1 General
B.2 Construction
B.3 Mounting mode
Annex C (Normative) Test methods for refrigeration (heating) capacity of compressor (unit)
C.1 General
C.2 Test methods D1 and D2: refrigerant gas flowmeter method
C.3 Test method F: refrigerant liquid flowmeter method
C.4 Test method G: water-cooled condenser calorimeter method
C.5 Test method J: refrigerant gas cooling method
C.6 Method K: compressor exhaust pipe calorimeter method
Annex D (Informative) Symbols and definitions in equations
Figure A.1 Requirements for arrangement of suction and exhaust pressure and temperature measuring points
Figure B.1 Rectifier construction
Figure B.2 Rectifier mounting requirements
Figure C.1 Schematic diagram of method D of single-stage compressor (unit)
Figure C.2 Schematic diagram of method D of multi-stage compressor (unit)
Figure C.3 Schematic diagram for Method F
Figure C.4 Schematic diagram for Method G
Figure C.5 Schematic diagram for Method J
Figure C.6 Schematic diagram for Method K
Table 1 Nominal conditions of compressor (unit)
Table 2 Inspection items
Table A.1 Requirements for minimum dimensions of straight pipe in suction pipelines
Table A.2 Requirements for minimum dimensions of straight pipe in exhaust pipelines
Table D.1 Symbols and definitions
