GB/T 5773-2004 Performance test methods for positive displacement refrigerant compressors
Some standard content:
1CS 27. 200
National Standard of the People's Republic of China
GB/T 5773—2004
Replaces GB/T5773—1986
The method of performance test for positive displacement refrigerant compressors
(ISO 917:1989 Testing of refrigerant comprcssors, MOD)Promulgated on June 9, 2004
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China Administration of Standardization of the People's Republic of China
Implementation on December 1, 2004
GB/T 5773—2004
This standard modifies and adopts [ISO917:1989(E) Testing method for refrigerant compressors. This standard is a revision of GB/T5773-1986 "Performance Test Method for Transverse Refrigeration Wax Press". The main differences between this standard and ISO 917:1939 (E) are as follows: ·· The referenced national standard ISO 917:1989 (F) is included in the main body of the standard, and its content is described in the test regulations of the main body of this standard and no longer appears as an appendix; ·· Appendix C of ISO 917:1989 (E) does not belong to the main body of the standard and is not required to be deleted. Compared with GB/T5773-1986, this standard has the following major changes: - The scope of application is not limited by power, but adopts the same method as ISO917:1989 (E), and is applicable to single-stage positive displacement refrigeration compressors: - Add normative references, terms and definitions, test methods: refrigerant gas cooling method, etc.; - The compressor performance test, including the main test and verification test, is changed to be the same as ISO917:1989 (F), and the test should include two test methods, X method and Y method, and both are carried out at the same time; - The symbols in the formula are changed to be consistent with ISO917:1989 (E). Appendix A and Appendix B of this standard are informative appendices. This standard replaces GB/T5773-1986 from the date of implementation. This standard is proposed by the China Machinery Industry Federation. This standard is under the jurisdiction of the National Technical Committee for Standardization of Refrigeration Equipment. The responsible drafting units of this standard are: Hefei General Machinery Research Institute, Zhejiang Guoyang Refrigeration Industry Co., Ltd. The participating drafting units of this standard are: Dalian Yang Compressor Co., Ltd. The main drafters of this standard are Ren Jinlu, Chen Junjian, Yue Haibing and Du Xigang. This standard is interpreted by the National Technical Committee for Standardization of Refrigeration Equipment. The previous versions of the standard replaced by this standard are: GB/T5773-1986.
GB/T5773--2004
ISO (formerly ISO) is a world-wide alliance of national standardization bodies (ISO member bodies). The formulation of international standards is usually carried out through ISO technical committees. Member bodies interested in a professional field for which a technical committee has been established have the right to participate in the committee. Liaison forces and non-governmental international organizations that have contact with ISO also participate in this work. ISO cooperates closely with the International Electrotechnical Commission (IEC) in the standardization of electrotechnical technology. The draft international standards adopted by the committee are circulated to all member bodies for voting in accordance with ISO procedures. When published as international standards, at least 75% of the member bodies must vote to approve them. The international standard ISO917 was proposed by the Technical Committee ISO/TC86 Refrigeration Subcommittee. The second edition of ISO 917 replaces the first edition (IS0917:1974), and this standard promotes its revision. Parties using this standard should indicate the time of revision of the international standard. Reference to this standard in other international standards means the latest version of the standard (unless otherwise specified).
1 Scope
Performance test methods for positive displacement refrigerant compressors GB/T 5773—2004
This standard applies to the performance test of single-stage positive displacement refrigerant compressors (hereinafter referred to as compressors). The test methods described and selected are used to measure the cooling capacity, power, volumetric efficiency, equivalent efficiency and refrigeration coefficient (unit power refrigeration maximum) of the compressor. Other types of compressor tests can also refer to the test methods described in this standard. 2 Normative references
The clauses in the following documents become clauses of this standard before being referenced by this standard. For any referenced document with a date, all subsequent amendments (excluding errata) or revisions are not applicable to this standard. However, parties that reach an agreement based on this standard are encouraged to study whether the latest version of this document can be used. For any referenced document without a date, its latest version is applicable to this standard. GB/T2624 Flow measurement Throttling device uses orifice plate, nozzle and venturi tube to measure the flow rate of fluid filling the circular tube (egv1S()5176-1:19913
GB9237 Safety requirements for mechanical refrigeration systems for refrigeration and heating (eqYISU5149:1993) 3 Terms and definitions
The following terms and definitions apply to this standard. 3.1
Refrigerant compressor refrigeration capacity@: refrigeranE compressor capacity The mass flow rate of refrigerant flowing through the compressor measured by the test directly multiplied by the refrigerant gas specific melting point at the compressor suction port and the liquid specific melting point at the saturation temperature (or dew point temperature) corresponding to the exhaust port pressure. 3.2
Volume efficiencyvolume efliciency
The ratio of the actual volume flow rate of the compressor under suction state measured at the specified position to the theoretical gas output of the compressor. 3.3
Input power Pinpul powen
For open compressors, it is the shaft power of the input compressor; for closed (including semi-closed and fully closed) compressors, it is the motor input power, as well as other auxiliary power required to maintain the normal operation of the compressor, such as an external lubricating oil pump. 3.4
Nisentrupic efficiency The ratio of the product of the actual mass flow rate of the refrigerant and the change in the compressor process and the input power of the compressor. 3.5
Coefficient of performance The ratio of the cooling capacity of the compressor to the input power. 4 Test regulations
4.1 General regulations
4. 1. 1 Eliminate non-condensable gases in the test system. Confirm that there is no refrigerant leakage. 4.1.2 There should be enough refrigerant in accordance with the relevant standards in the system, and the amount of lubricating oil in the compressor to maintain normal operation: 4.1.3 An effective oil separator should be installed in the exhaust pipe to ensure that the oil content in the circulating refrigerant liquid does not exceed 1.5% (by mass). GB/T 5773—2004
Measurement method is shown in Appendix A.
4.1.4 The pressure and temperature of the compressor suction and exhaust ports shall be measured at the same measuring point, which shall be at a straight pipe section 0.3m outside the suction and exhaust cut-off points. For closed compressors without valves, the pressure and temperature shall be at a straight pipe section 0.15m from the casing. 4.1.5 There shall be no abnormal air flow around the test system. 4.1.6 The ambient temperature of the test device shall be (30±5)℃. 4.1.7 Provide the test system with the following conditions: Equipment for extracting samples of refrigerant-oil mixture from the surface to measure the oil content. 4.2 Test regulations
4.2.1 Compressor performance test includes two test methods, namely X method and Y method, and the two methods should be measured at the same time. 4.2.2 The deviation between the test results of X method and Y method should be within ±4%, and the average value of the measurement and calculation results of X method and Y method should be used for extrapolation.
4.2.3 During the compressor test, the system should be in thermal equilibrium state, and the test time is generally not less than 1.5h. The measurement data should be recorded every 20min after the test conditions are stable for half an hour, until the four measurement data meet the requirements of Table 2 in 4.3 and 4.2.2. The time from the first measurement to the fourth measurement record is called the test cycle, and small adjustments to pressure, temperature, flow rate and liquid level are allowed during this period.
4.2.4 Types of test methods
According to the provisions of 4.2.1, all tests should include two test methods. The data specified in the test report (see 4.5.2) and the additional data required by each test method should be measured during each test cycle. The nine different test methods are as follows: Method A: Secondary refrigerant calorimeter method (see 5.1); Method B: Full liquid refrigerant calorimeter method (see 5.2); Method C: Downstream refrigerant calorimeter method (see 5.3); Method D1: Suction pipe refrigerant gas flowmeter method (see 5.4); Method D2: Exhaust pipe refrigerant gas flowmeter method (see 5.4); Method F: Refrigerant liquid flowmeter method (see 5.5): Method (: Water-cooled evacuator calorimeter method (now 5.6) Method J: Refrigerant gas cooling method (see 5.7); Method K: Compressor exhaust pipe calorimeter method (see 5.8). 4.2.5 Selection of test methods X and Y
Test force methods A, B, C, D1, D2, F, G and K Any of the above methods can be used as Method X. Except for the following points, any test method can also be used as Method Y. Test methods used as Method X;
Any method that measures the same quantity as Method X, for example: assuming that Method X measures the gas flow rate of the compressor exhaust pipe, then b
other test methods that measure the gas flow rate of the compressor exhaust pipe will no longer be selected as Method Y (such as J>2 cannot be combined with Method K), any method whose measurement method is similar to the principle of Method X, for example: assuming that Method X adopts the DI refrigerant gas flow meter method, then e
D2 refrigerant gas flow meter method will no longer be selected as Method Y. 4.2.6 Combination of Test Method X and Method Y
Table 1 gives the permitted and recommended combinations of Method X and Method Y. Table 1 Combination of Method X and Method Y
DI, D2, FGK
DI.DZ.FGK
4. 3 Test parameter provisions
Table 1 (line)
D1,D2,FG,K
ABCFGIK
A,B,C,DI.D2,K
ABCD1.D2,F
ARC,DI,FJ
The range of test parameter deviation allowed during the test shall be as specified in Table 2. Table 2 Test parameter allowable deviation
Test parameters
Suction pressure
Discharge pressure
Suction temperature
Shaft speed
The maximum allowable deviation between each measured value and the specified value -1. c%
-3, c%
DI,D2,K
GB7E 5773-2004
The maximum allowable deviation of any reading of the measured value relative to the average value is 0.5%
4.3.2 The temperature difference between the inlet and outlet of the calorimeter or the heat medium during calibration or testing shall not be less than 6°C. 4.4 Provisions on measuring instruments and accuracy
4.4.1 General provisions
4.4.1.1 The types of instruments used in the test can be measured by one or more types. 4.4.1.2 The test instruments should be within the effective use period and should have a certificate of recent calibration by the national metrology department or relevant departments. 4.4.2 Temperature measuring instruments and accuracy
4.4.2.1 Instruments
The instruments for measuring temperature include: glass mercury overflow meter, thermocouple, resistance thermometer, card conductor thermometer and differential thermometer. 4, 4.2. 2 Accuracy
The inlet and outlet temperature of the heating or cooling medium and the refrigerant of the calorimeter: Accuracy ±0.1℃ a)
The cooling water temperature in the condenser; Accuracy ±0.1℃: b)
The suction temperature of the compressor, the temperature before the flow throttling device: Accuracy ±G.1℃; The accuracy of other temperatures is mainly 0.2℃,
4.4.2.3 Provisions for temperature measurement
The thermometer sleeve adopts a thin-walled steel pipe or a stainless steel thin-walled pipe, and is inserted vertically into the fluid (the size of the thermometer sleeve does not significantly affect the airflow). When the pipe diameter is small, it can be inserted obliquely in the reverse flow or with a temperature measuring tube, and the insertion depth is 1/2 of the pipe diameter. The sleeve is filled with a refrigerator, and the temperature should not be pulled out when reading. When possible, it is used to measure the inlet and outlet of the heating or cooling medium and refrigerant of the calorimeter! When the temperature difference is measured, the inlet and outlet thermometers should be switched for measurement after each reading to improve the measurement accuracy; the measurement of the calorimeter ambient temperature is the average temperature measured in four directions at a height of 0.5m from the outer surface of the calorimeter and the center of the calorimeter.
GB/T5773—2004
4.4.3 Pressure measuring instruments and accuracy
4.4.3.1 Instruments
The instruments for measuring pressure include spring tube pressure gauges, U-tube differential pressure gauges, pressure sensors and mercury column dynamometers. 4.4.3.2 Accuracy
For all pressure measuring instruments, the accuracy of absolute pressure reading or differential pressure reading shall be within ±1.4.4.3.3 Pressure measurement regulations
a) When measuring atmospheric pressure with a mercury barometer, the reading shall be corrected for temperature, or the weather pressure value shall be consulted from the local meteorological office.b) The inner diameter of the glass tube of the U-type differential pressure gauge shall not be less than 6mm.4.4.4 Flow measurement instruments and accuracy
4.4.4.1 Instruments
Flow meters include: liquid measuring containers, flow throttling devices, and liquid mass or volume flow meters, etc.4.4.4,2 Accuracy
a) Heating or cooling mass of calorimeters, mass or volume flow of refrigerant liquids: the accuracy shall be within ±2% of the measured flow rate; b) Refrigerant gas flow rate: the accuracy shall be within ±2% of the measured flow rate. 4.4.4.3 Flow measurement regulations
) The design, manufacture, installation and calculation of flow throttling devices shall comply with the provisions of GB/T 2624; b) The differential pressure reading of the flow throttling device shall not be less than 250mm liquid column height. 4.4. 5 Electrical measurement instruments and accuracy
4.4.5.1 Instruments
Electrical measurement instruments include: power meter (including indicating and integrating type), ammeter, voltmeter, power factor meter, frequency meter and mutual inductor. 4.4.5.2 Accuracy level
a) Power meter: refers to the system with 0.5 level accuracy, integrating or 1 level accuracy; b) Ammeter, voltmeter. Power factor meter is called frequency meter: 0.5 level accuracy; c) Mutual inductor: 0.2 level accuracy.
4.4.5.3 Electrical Measurement Regulations
The measured value of the wattmeter should be above 1/3 of the full scale (the measured value of one of the wattmeters can be less than 1/3 when using the two wattmeter method). When measuring the power of a three-phase AC motor using the "two wattmeter" method or the "three wattmeter" method, the indicated current and voltage values should not be less than 60% of the rated current and voltage values of the wattmeter.
4,4.6 Compressor Power Meter Attenuation and Accuracy 4.4.6.1 Calibration
Power measuring instruments include: torque tachometer, balance dynamometer, standard motor and other dynamometers. 4. 4. 6. 2 Precision
The accuracy is within ±1.5% of the measured shaft power. 4.4.6.3 Power measurement regulations
a) The input power of three-phase AC motors is measured by the "two power meters" method or the "three power meters" method; b) When there is a belt or external gear drive, the transmission efficiency is as follows: direct drive: 1.0;
precision gear drive (each stage) 0.985
V-belt drive: 0.965.
4.4.7 Speed tracing instruments and accuracy
4.4.7.1 Instruments
Speed measuring instruments include: speed counting method, speed meter and flash speed meter, etc. 4.4.7.2 Precision
The accuracy is within ±1% of the measured speed. 4.4.8 Time measurement
A stopwatch is used for measurement. The accuracy is ±0.1% of the measured elapsed time. 4.4.9 Weight (mass) measurement
Use various types of platform scales, balances and scales. The accuracy is 0.2% of the measured weight (mass). 4.5 Test data collation and test report
4.5. Test data collation
GB/T 5773—2004
4.5.1. The values of the physical properties of the refrigerant used for calculation should adopt the latest published tables and diagrams of the physical properties of the relevant refrigerants. 4.5.1.2 The suction pressure of the compressor and its related pressures should be corrected according to the local atmospheric pressure value during the test. 4.5.1.3 All measured values should be calculated based on the average value of four consecutive soft measurements during the test period. 4.5, 1.4 The refrigeration capacity and shaft power of the open compressor are corrected by shaft speed; the refrigeration and input power of the closed compressor are corrected by frequency.
4.5, 2 Test report
4. 5. 2. 1 General data
Test period, start time, end time and measurement time: b)
Compressor category, model and serial number:
Compressor rated power
Compressor main structural parameters,
Compressor theoretical gas transmission conditions;
Compressor nominal speed or nominal frequency:
Refrigerant and lubricating oil,
4.5.2.2 Test conditions
Compressor suction pressure (corresponding evaporation temperature or dew point), suction temperature: b) Compressor discharge pressure (corresponding condensation temperature or dew point temperature) subcooling temperature. 4.5.2.3 Test method
x method:
4.5.2.4 Average value of test measurement values a)
Ambient temperature, atmospheric pressure: www.bzxz.net
Compressor suction pressure, temperature
Compressor exhaust pressure temperature:
Compressor speed or frequency,
Compressor lubricating oil pressure, temperature;
Power supply voltage, frequency, motor input power: Cooling water inlet and outlet temperature and flow rate:
h) Other data (depending on the test method used, different additional data may be required). 4.5.2.5 Test results
Heat leakage coefficient:
Refrigerant flow rate:
Related refrigerant ratio and ratio difference;
Compressor cooling capacity:
Volumetric efficiency:
GB/T5773-2004
Shaft power of open compressor and input power of closed compressor, g)
Equivalent efficiency;
Control coefficient:
i) Deviation of x method and y method test.
5 Test method
5.1 Method A; Second refrigerant calorimeter method (Figure 1) 5.1.3 Construction
The second refrigerant calorimeter consists of a set of direct evaporation coils as evaporator, which is suspended on the upper part of an insulated pressure vessel, and the electric heater is installed at the bottom of the vessel and is submerged by the first calorimeter in the vessel. The refrigerant flow is regulated by an expansion valve installed close to the calorimeter. In order to reduce the influence of external heat, the pipe between the expansion valve and the calorimeter should be insulated
The heat leakage of the calorimeter should not exceed 5% of the refrigeration capacity of the compressor. The pressure of the second refrigerant should be measured by a pressure measuring instrument with a graduation of 0.005MPa, and the pressure of the second refrigerant should not exceed the safety limit of the calorimeter in accordance with the provisions of GB9237. logp
Calorifier
Compressor auxiliary machine
Heater
Flow chart
5.1.2 Calibration of heat requirement
Net condensing type
Figure 1 Method A
Calibrate the heat leakage after closing the refrigerant inlet and outlet shut-off valves of the calorimeter. log ph graph
hpa 2a1
Regulate the electric heat input to the second refrigerant so that the saturation temperature (or dew point temperature) corresponding to the second refrigerant pressure is about 15℃ higher than the ambient temperature, and keep its pressure unchanged. The ambient temperature should be below 43℃, and its temperature fluctuation should not exceed ±1℃. The fluctuation of the electric heater input power should not exceed ±1%. Measure the second refrigerant pressure every 1h until the corresponding saturation temperature (or dew point temperature) value fluctuates no more than ±0.5℃ for four consecutive times. The heat leakage coefficient is calculated using formula (1):
Note: The symbols in the formula are shown in Appendix B, the same below. 5.1.3.1 The compressor refrigerant gas pressure is adjusted by the expansion valve, and the suction temperature is adjusted by the electric heating input to the second refrigerant. 5.1.3.2 The compressor refrigerant exhaust pressure is adjusted by changing the cooling water volume, heat exchange area or cooling water temperature of the refrigeration unit, and can also be adjusted by the pressure control valve in the exhaust pipe. GB/T 5773--2004 5.1.3.3 During the test period, the fluctuation of the input electric heating shall not cause the change of the compressor cooling capacity to exceed 1%. If the heater is intermittent, the change of the saturation temperature (or dew point temperature) corresponding to the first refrigerant liquid pressure shall be less than ±0.5℃. 5. 1. 3. 4
Additional data
Pressure and temperature of refrigerant gas at the outlet of the base calorimeter: b)
Pressure and temperature of refrigerant liquid before the expansion valve; calorimeter ambient temperature:
Pressure of the second refrigerant;
Electrical heating capacity of the input calorimeter.
Calculation of cooling capacity
5. 1. 4. 1
5. 1. 4. 2
Refrigerant flow plate measured by test
Actual cooling capacity under specified working conditions
Φ + F,
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