GB/T 5773-2016 PDF English
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| GB/T 5773-2016 | English | 515 |
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The method of performance test for positive displacement refrigerant compressors
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| GB/T 5773-2004 | English | RFQ |
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The method of performance test for positive displacement refrigerant compressors [including MODIFICATION 1]
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| GB/T 5773-1986 | English | 759 |
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The methods of performance test for positive displacement refrigerant compressors
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GB/T 5773-2016: The method of performance test for positive displacement refrigerant compressors---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT5773-2016
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
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)
JB/T 7249, Refrigeration and air conditioning apparatus - Terminology
3 Terms and definitions
For the purpose of this document, the following terms and definitions, as well as those
given in JB/T 7249, apply.
3.1
positive displacement refrigerant compressor
The refrigerant compressor that relies on the reduction of the internal volume of the
compression chamber to increase the refrigerant vapor pressure.
3.2
compressor refrigerating capacity
Under the specified refrigeration capacity test conditions, the mass flow rate of
refrigerant flowing through the evaporator in the refrigeration cycle where the
compressor is located multiplied by the difference between the refrigerant gas specific
enthalpy at the compressor suction port and the refrigerant liquid specific enthalpy
before expansion in the evaporator in the refrigeration cycle where the compressor is
located.
3.3
compressor heating capacity
Under the specified heating capacity test conditions, the mass flow rate of refrigerant
flowing through the exhaust side of the compressor multiplied by the difference
between the specific enthalpy of the refrigerant gas at the compressor exhaust port and
the specific enthalpy of the refrigerant liquid before expansion in the evaporator (air
supply circuit) in the refrigeration cycle where the compressor is located.
Note. The unit is W.
4 Test regulations
4.1 General regulations
4.1.1 Remove non-condensable gases from the test system. Check that there is no
refrigerant leakage.
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.
4.2.4 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.
4.2.5 Selection between test method X and method Y
For subcritical cycle compressors, any of the performance test methods A, B, C, D1,
D2, F, G and K may be used as method X.
4.2.6 Combination of test method X and method Y
Table 1 shows the permitted and recommended combinations of method X and method
Y for the performance test of subcritical cycle compressors.
4.4 Provisions for measuring instruments and accuracy
4.4.1 General provisions
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.
4.4.2.3 Measurement regulations
The following requirements shall also be met during measurement.
4.4.3 Pressure measurement
4.4.3.1 Instrumentation
Instruments for measuring pressure include. spring tube pressure gauge, pressure sensor
and mercury column atmospheric pressure gauge, etc.
4.4.3.2 Accuracy
For all pressure measuring instruments, the accuracy of absolute pressure reading or
differential pressure reading shall be within ±1.0%.
4.4.3.3 Measurement regulations
When measuring atmospheric pressure using a mercury barometer, the reading shall be
corrected for temperature.
4.4.4 Flow measurement
4.4.5 Electrical measurements
4.4.5.1 Instrumentation
Electrical measuring instruments include. power meter (including indicating and
integrating types), ammeter, voltmeter, power factor meter, frequency meter and
transformer.
4.4.5.2 Accuracy
The accuracy requirements of the measuring instrument are as follows.
4.4.5.3 Measurement regulations
The power meter measurement value shall be above 1/3 of the full scale (when using
the “two-power meter” method for measurement, the measured value of one of the
power meters can be less than 1/3 of the full scale). When using the “two-power meter”
method or the “three-power meter” method to measure the power of a three-phase AC
motor, the indicated current and voltage values shall not be less than 60% of the rated
current and voltage values of the power meter.
For digital power meters. If a current transformer is used, the actual displayed current
value shall not be less than 20% of the transformer range.
4.4.6 Compressor power measurement
4.5.2 Test report
4.5.2.1 General data
It mainly includes.
4.5.2.2 Test conditions
It mainly includes.
4.5.2.3 Test method
Method X and method Y.
4.5.2.4 Average value of test measured values
It mainly includes.
4.5.2.5 Test result data
It mainly includes.
5 Test methods
5.1 Test methods for subcritical cycle compressors
5.1.1 Method A. Second refrigerant calorimeter method (Figure 1)
The performance test process of single-stage compressor is shown in Figure 1a); the
performance test process of compressor equipped with economizer is shown in Figure
1b); the performance test process of compressor equipped with flash-tank is shown in
Figure 1c).
5.1.1.1 Construction
The second refrigerant calorimeter is composed of a group of direct evaporation coils
as an evaporator, which is suspended on the upper part of an insulated pressure container.
The electric heater is installed at the bottom of the container and is immersed in the
second refrigerant in the container.
5.1.1.3 Test procedure
5.1.1.3.1 The suction pressure of the compressor refrigerant is regulated by the main
circuit expansion valve, and the suction temperature is regulated by the electric heating
capacity input to the second refrigerant.
5.1.2 Method B. Fully liquid refrigerant calorimeter method (Figure 2)
The performance test process of single-stage compressor is shown in Figure 2a); the
performance test process of compressor equipped with economizer is shown in Figure
2b); the performance test process of compressor equipped with flash-tank is shown in
Figure 2c).
5.1.2.3.5 During the test period, the change in the compressor refrigerating capacity
caused by the fluctuation of the input heat shall not exceed 1%. If the heater is working
intermittently, the change in the saturation temperature (or dew point temperature)
corresponding to the refrigerant liquid shall be less than ±0.5 ℃.
5.1.2.3.6 Additional data include.
5.1.2.4 Refrigerant flow rate calculation
6 Input power calculation
6.1 Motor input power measurement
6.2 Compressor shaft power calculation
6.3 Input power
The input power shall be the above motor input power or compressor shaft power after
correction plus the auxiliary power required to maintain the compressor operation. The
above power shall be corrected for open or closed compressors according to Formula
(24) to obtain the input power.
7 Calculation of cooling (heating) coefficient of performance
7.1 Compressor refrigerating capacity
7.1.1 Calculate the actual compressor refrigerating capacity under specified working
conditions as follows.
7.1.2 Calculate the compressor refrigerating capacity based on the measured
compressor refrigerating capacity after speed correction or frequency correction
according to Formula (28).
7.2 Cooling coefficient of performance
Calculate the cooling coefficient of the compressor according to Formula (29).
7.3 Compressor heating capacity
7.4 Heating coefficient of performance
Calculate the heating coefficient of the compressor according to Formula (35).
8 Volume efficiency calculation
Calculate the volume efficiency of the compressor according to Formula (36).
9 Isentropic efficiency calculation
Calculate the isentropic efficiency of single-stage compressor according to Formula
(37).
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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