GB/T 5773-2016 English PDF (GBT5773-2016)

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GB/T 5773-2016: The method of performance test for positive displacement refrigerant compressors
GB/T 5773-2016
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 27.200
J 73
Replacing GB/T 5773-2004
The method of performance test for positive displacement
refrigerant compressors
ISSUED ON: DECEMBER 13, 2016
IMPLEMENTED ON: JULY 01, 2017
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Terms and definitions ... 5
4 Test regulations ... 6
5 Test methods ... 15
6 Input power calculation ... 46
7 Calculation of cooling (heating) coefficient of performance ... 47
8 Volume efficiency calculation ... 49
9 Isentropic efficiency calculation ... 49
10 Deviation between method X and method Y ... 49
11 Performance measurement uncertainty analysis ... 50
Appendix A (Informative) Oil content measurement method ... 51
Appendix B (Informative) Symbols and meanings used in formulas ... 52
Appendix C (Informative) Performance measurement uncertainty analysis example 56
The method of performance test for positive displacement
refrigerant compressors
1 Scope
This Standard specifies the terms and definitions, test regulations, test methods, as well
as calculation of input power, cooling (heating) coefficient of performance, volume
efficiency, isentropic efficiency and test deviation for positive displacement refrigerant
compressors.
This Standard applies to the performance test for single-stage positive displacement
refrigerant compressor (hereinafter referred to as “single-stage compressor”), positive
displacement refrigerant compressor equipped with economizer (hereinafter referred to
as “compressor equipped with economizer”) and positive displacement refrigerant
compressor equipped with flash-tank (hereinafter referred to as “compressor equipped
with flash-tank”). It applies as a reference to the tests for other types of compressors.
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 document (including any amendments) applies.
GB/T 2624.1, Measurement of fluid flow by means of pressure differential devices
inserted in circular cross-section conduits running full - Part 1: General principles
and requirements
GB/T 2624.2, Measurement of fluid flow by means of pressure differential devices
inserted in circular cross-section conduits running full - Part 2: Orifice plates
GB/T 2624.3, Measurement of fluid flow by means of pressure differential devices
inserted in circular cross-section conduits running full - Part 3: Nozzles and Venturi
nozzles
GB/T 2624.4, Measurement of fluid flow by means of pressure differential devices
inserted in circular cross-section conduits running full - Part 4: Venturi tubes
GB 9237, Refrigerating systems and heat pumps - Safety and environmental
requirements
GB/T 29030-2012, Positive displacement CO2 refrigerant compressor (unit)
4.1.6 Provide equipment for sampling the refrigerant-oil mixture to measure the oil
content.
4.2 Test regulations
4.2.1 The compressor refrigerating capacity performance test of a single-stage
compressor includes two test methods, namely, method X and method Y. The two
methods shall be tested simultaneously; the deviation between the test results of method
X and method Y shall be within ±4%; the average value of the measurement and
calculation results of method X and method Y shall prevail.
4.2.2 For the compressor heating capacity test of the compressor and the compressor
refrigerating capacity test of the compressor equipped with economizer or flash-tank,
only one test method (method X or method Y) may be used for measurement.
4.2.3 During the test of a compressor, the system shall establish a thermal equilibrium
state, and the test time shall generally be no less than 1 hour. The measurement data
shall be recorded once every 15 minutes after the test conditions have stabilized for half
an hour, until the four measurement data meet the requirements of Table 2, 4.2.1 and
4.2.2. If the test data is automatically collected by computer, the continuous
measurement data collection time shall not be less than 30 minutes. Minor adjustments
to pressure, temperature, flow and liquid level are allowed during the test data recording
period.
4.2.4 Types of test methods
The compressor test shall comply with the requirements of 4.2.1 and 4.2.2. During each
test cycle, the data specified in the test report (see 4.5.2) shall be measured, together
with any additional data required for each test method.
a) Test methods for subcritical cycle compressors
The nine different test methods are as follows:
Method A: Second refrigerant calorimeter method (see 5.1.1);
Method B: Fully liquid refrigerant calorimeter method (see 5.1.2);
Method C: Dry refrigerant calorimeter method (see 5.1.3);
Method D1: Suction pipe refrigerant gas flow meter method (see 5.1.4);
Method D2: Exhaust pipe refrigerant gas flow meter method (see 5.1.4);
Method F: Refrigerant liquid flow meter method (see 5.1.5);
Method G: Water-cooled condenser calorimeter method (see 5.1.6);
Method J: Refrigerant gas cooling method (see 5.1.7);
4.3.2 The temperature difference between the inlet and outlet of the cooling or heating
medium of the calorimeter shall not be less than 6 °C during calibration or testing.
4.4 Provisions for measuring instruments and accuracy
4.4.1 General provisions
4.4.1.1 The types of instruments for testing may be one or more.
4.4.1.2 The instruments for testing shall be calibrated and within the valid use period.
4.4.2 Temperature measurement
4.4.2.1 Instrumentation
Instruments for measuring temperature include: glass mercury thermometer,
thermocouple, resistance thermometer, semiconductor thermometer and differential
thermometer.
4.4.2.2 Accuracy
The accuracy requirements of the measuring instrument are as follows:
a) Inlet and outlet temperatures of the heating or cooling medium and refrigerant
of the calorimeter: accuracy ±0.1 °C;
b) Temperature of cooling water in condenser: accuracy ±0.1 ℃;
c) Compressor suction temperature, temperature before flow throttling device:
accuracy ±0.1 ℃;
d) Other temperatures: accuracy ±0.2 °C.
4.4.2.3 Measurement regulations
The following requirements shall also be met during measurement:
a) The thermometer sleeve is made of thin-walled steel pipe or stainless steel thin-
walled pipe or copper pipe, and is inserted vertically into the fluid (the size of
the thermometer sleeve shall not significantly affect the airflow). If the pipe
diameter is small, it can be inserted obliquely in reverse flow or a temperature
measuring tube can be used, and the insertion depth is 1/2 the pipe diameter.
Heat-conducting medium is injected into the sleeve, and the thermometer shall
not be pulled out when reading.
b) Where possible, when measuring the inlet and outlet temperature difference of
the heating or cooling medium and refrigerant in the calorimeter, the inlet and
outlet thermometers shall be exchanged after each reading to improve the
measurement accuracy.
Electrical measuring instruments include: power meter (including indicating and
integrating types), ammeter, voltmeter, power factor meter, frequency meter and
transformer.
4.4.5....