Some standard content:
JB/T9056—1999
This standard is a revision of ZBJ73008.1—89 "Piston-type single-stage refrigeration compression condensing units 1 types and basic parameters", ZBJ73
008.2—89 "Technical conditions for piston-type single-stage refrigeration compression condensing units" and ZBJ73008.3--89 "Test methods for piston-type single-stage refrigeration compression condensing units".
Compared with ZBJ73008.1~008.3-89, the main technical contents of this standard have been changed as follows: the name of the standard has been modified;
The scope of application of the standard has been modified;
The provisions on the model have been cancelled, and a reminder appendix has been set up; the nominal refrigeration capacity working conditions have been modified, and new working fluids have been added; the insulation resistance value has been modified;
The provisions on the maximum temperature have been modified;
-The provisions on unit noise have been modified;
-The provisions on cleanliness have been cancelled;
The test pressure of the airtightness test has been modified. This standard replaces ZBJ73008.1~008.3-89 from the date of implementation. Appendix A of this standard is a reminder appendix.
This standard is proposed and managed by the National Technical Committee for Standardization of Refrigeration Equipment. The responsible drafting units of this standard are: Shanghai General Mechanical Technology Research Institute, Shanghai Centennial Taikang Machinery Equipment Co., Ltd. The main drafters of this standard are Weng Jianting, Wang Chi, Dong Tianlu, Ge Weiming. 574
Machinery Industry Standard of the People's Republic of China
Positive displacement refrigerant compressor condensing units
Positive displacement refrigerant compressor condensing units1Scope
JB/T9056—1999
Replaces ZBJ73008.1～008.3—89
This standard specifies the types, basic parameters, technical conditions and performance test methods of positive displacement refrigerant compressor condensing units. This standard applies to positive displacement refrigerant compressor condensing units (hereinafter referred to as units) with piston, rotary or scroll compressors. This standard does not apply to compression condensing units used in household refrigerators, room air conditioners, automotive air conditioners, and dehumidifiers. 2 Referenced standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard was published, the versions shown were all valid. All standards are subject to revision. Parties using this standard should explore the possibility of using the latest versions of the following standards. GB191--1990 Pictorial markings for packaging, storage and transportation
GB/T2624-1993 Flow measurement Throttling device Measuring the flow of fluids filling a circular tube using orifice plates, nozzles and venturi tubes GB/T5773-1986 Performance test methods for positive displacement refrigeration compressors GB/T6388-1986 Shipping and receiving markings for transport packaging GB9237-1988 General technical specifications for refrigeration equipment GB/T13306-1991 Labels
JB/T4330-1999 Determination of noise for refrigeration and air-conditioning equipment 3 Terminology
3.1 Positive displacement refrigeration compression condensing unit
A specific combination of one or more positive displacement refrigeration compressors, motors, condensers and necessary auxiliary equipment suitable for a given refrigerant.
3.2 Nominal cooling capacity of the unit
The value obtained by testing the mass flow rate of the refrigerant of the compressor multiplied by the difference between the specific flame of the refrigerant vapor at the suction port of the unit and the specific flame of the refrigerant liquid at the discharge port.
3.3 Total input power of the unit
It is the sum of the input power of the compressor motor plus the input power used by other auxiliary equipment (such as fan motor, etc.) included in the unit. 3.4 Unit unit power output cooling capacity (EER) The ratio of the nominal cooling capacity of the unit to the total input power. 4 Structural type
4.1 According to the compressor structural type, it can be divided into open type, semi-closed type and fully closed type. 4.2 According to the cooling method of the condenser, it can be divided into water-cooled type and air-cooled type. 4.3 The model representation method of the unit is shown in Appendix A (Suggested Appendix). Approved by the State Bureau of Machinery Industry on July 12, 1999, and implemented on January 1, 2000
Basic parameters
The nominal cooling capacity of the unit is as specified in Table 1. 5.1
Suction temperature
Evaporation temperature2
1) See Appendix A.
R12, R134a
R22.R404A
R407C, R502
5/183)
2) For non-azeotropic refrigerants, it is the suction dew point temperature. JB/T9056--1999
Condenser inlet and outlet temperature
Air inlet
Dry bulb temperature
3) For fully enclosed compressors, the suction temperature is 5C: for open or semi-enclosed compressors, the suction temperature is 18C. ℃
Ambient temperature
5.2 In water-cooled units, the fouling coefficient of the water side of the heat transfer tube of the condenser under nominal conditions is 0.172 (m2, C)/kW for steel tubes and 0.086 (m2.C)/kW for copper tubes.
6 Technical requirements
6.1 The unit shall be manufactured in accordance with the provisions of this standard and in accordance with the drawings and technical documents approved through the prescribed procedures. 6.2 The unit shall be able to operate normally for a long time under the following maximum load operating conditions: a) Maximum ambient temperature: 43℃;
b) Maximum water inlet temperature of the water-cooled condenser is 33℃; c) Maximum evaporation temperature: specified by the manufacturer in the instruction manual. 6.3 The refrigeration compressor in the unit shall comply with the provisions of the relevant refrigeration compressor product standards. 6.4 The motor, fan, condenser and necessary auxiliary equipment in the unit shall comply with the provisions of the relevant product standards. 6.5 The electrical and control components of the unit shall comply with the provisions of the relevant product standards. 6.6 The relevant safety protection devices in the unit shall comply with the relevant provisions of GB9237. The refrigeration system of the unit shall be airtight, clean and dry, and there shall be no leakage during operation. 6.7
6.8 The water pressure loss of the cooling water passage in the condenser of the water-cooled unit shall be less than 0.1MPa under nominal conditions. 6.9 The electrical parts of the unit shall meet the following requirements: 6.9.1 There shall be a reliable grounding device.
6.9.2 The insulation resistance of live parts to non-live parts shall not be less than 1MQ. 6.9.3 The insulation dielectric strength test of live parts to non-live parts shall not have breakdown and flashover. 6.10 The unit shall be able to start and operate normally under maximum load operating conditions when the power supply voltage is 90% and 110% of the rated voltage. 6.11 The tolerance between the actual cooling capacity of the unit under nominal cooling capacity and the cooling capacity on the nameplate is: -7% for less than 35kW and -5% for greater than or equal to 35kW. The tolerance between the total input power and cooling water consumption under nominal conditions and the specified value is +5%. 6.12 The appearance of the unit should be clean, free of defects and have anti-corrosion properties. The coating surface should be flat and smooth with uniform color. 6.13 The noise of the unit should meet the design limit requirements and relevant national environmental protection regulations. 6.14 According to the use conditions of the unit, the following components can be configured: 576
a) Unit electrical control device;
JB/T9056—1999
b) Pressure gauge and pressure controller (including high pressure, low pressure, oil pressure); c) Liquid receiver;
d) Various valves;
e) Refrigerant liquid pipeline drying filter; f) Water supply control device;
g) Liquid pipeline humidity indicator;
h) Gas-liquid separator and suction filter;
i) Others.
6.15 Under the condition that the user complies with the provisions in the product manual, the manufacturer shall provide free warranty for the user if the unit is damaged or cannot work normally due to poor manufacturing quality within 18 months from the date of shipment from the manufacturer and does not work for more than 5000 hours. 7
Inspection rules
7.1 Each component and auxiliary equipment in the unit shall be inspected by the manufacturer's technical inspection department in accordance with this standard and relevant standards and technical documents.
7.2 Factory inspection
Each unit shall undergo the following factory inspection, and the test methods shall be carried out in accordance with the provisions of this standard. 7.2.1 Air tightness test.
7.2.2 Insulation resistance test.
7.2.3 Insulation dielectric strength test.
7.2.4 Electrical and control action test (when applicable). 7.3 Type inspection
7.3.1 If the unit has any of the following conditions, a type inspection shall be carried out after passing the factory inspection: a) Trial determination and identification of new products or old products transferred to the factory for production; b) After formal production, if there are major changes in structure, materials, and processes that may affect product performance. 7.3.2 Type inspection requirements shall be carried out in accordance with the provisions of 8.4 to 8.8. 7.4 Random inspection
Each type of unit produced in normal batches shall be inspected and tested according to the number of units specified in Table 2 based on the annual output. If there are any unqualified units in the random inspection, re-inspection shall be carried out with double the number. If they are still unqualified, the batch of products shall be inspected one by one. The random inspection requirements shall be carried out in accordance with the provisions of 8.4, 8.5, 8.6 and 8.8.
Number of inspection
Number of random inspection
8 Test items
8.1 Air tightness test
>100～500
≥500
After the unit is assembled, its refrigeration system shall be filled with dry air or nitrogen for air tightness test; the test pressure shall be in accordance with the provisions of Table 3, and ensure that the unit meets the provisions of 6.7. Table 3
Refrigerant
R22, R404A, R407C, R502, R507, R717R12, R134a
Force MPa
8.2 The unit shall be subjected to the following tests
JB/T 9056—1999
8.2.1 Insulation resistance test: Use a 500V DC insulation resistance meter to measure the insulation resistance of the live parts to the non-live parts of the unit, which shall not be less than 1 M2.
8.2.2 Insulation dielectric strength test: Conduct an insulation dielectric strength test between the live parts and the non-live parts of the unit. When the charged part is below 300V, the test current is 50Hz and the sine wave AC voltage is 1500V; when the charged part is above 300V, the test voltage is 1000V + 2 times the working voltage, which lasts for 1min or the test voltage increases by 20% for 1s, and there should be no breakdown or flashover. 8.3 Electrical and control component action test
The electrical and control components in the unit should be tested for action, which should be sensitive and reliable. 8.4 Nominal cooling capacity working condition test
At the specified voltage and frequency, the working conditions specified in Table 1 should be followed. Determine its nominal cooling capacity, total input power, unit input power cooling capacity, water volume and water resistance.
8.5 Partial load operation test
For units with unloading stages, partial load operation tests should be carried out at each unloading stage to measure its cooling capacity and input power under nominal conditions. 8.6 Maximum load operation test
8.6.1 Carry out in accordance with the requirements of 6.2.
8.6.2 When the power supply voltage is 90% and 110% of the rated voltage, the unit should be able to start normally and run for at least 1 hour each. 8.7 Full performance test
The unit should provide a full performance curve chart after the test, that is, the cooling capacity, total input power and other values under different condenser inlet water (inlet air) temperatures (not less than 3 points) and different evaporation temperatures (not less than 5 points). The water volume during the test of the water-cooled unit is the same as the water volume under the nominal operating condition.
8.8 Noise test
The unit shall be measured under the nominal cooling capacity condition in accordance with the provisions of JB/T4330. 9 Performance test requirements
9.1 General requirements for test equipment
9.1.1 The test equipment should be set up in a test room where the ambient temperature can be controlled. 9.1.2 The refrigeration system of the test device should ensure that there is no refrigerant leakage and escape. 9.1.3 The liquid pipeline and suction pipeline of the test device should be insulated. 9.1.4 When using a liquid receiver, the refrigerant in the receiver should maintain a normal liquid level during operation. 9.1.5 The test device should be equipped with a joint that can extract the refrigerant-oil mixture. 9.1.6 There should be no abnormal air flow around the test device. 9.2 Adjustment requirements during the test
9.2.1 The reading deviation of each test parameter during the test shall be in accordance with the provisions of Table 4. Table 4
Test parameters
Suction (absolute) pressure, %
Suction temperature, C
Condenser inlet air temperature, C
Condenser inlet water temperature, ℃
Voltage, %
Maximum allowable deviation between measured value and specified value ±1.0 (or 2kPa)
Note: Applicable when the value of 1.0% is less than 2kPa. 578
【The maximum allowable deviation of each measured value reading relative to the average value is ±0. 5
JB/T9056—1999
9.2.2 The ambient temperature of the water-cooled unit shall be the temperature specified in the corresponding compressor standard. The temperature value is the average reading of four temperature measuring instruments placed on a horizontal plane with a height of half the unit height and 450mm away from each side. 9.2.3 The condenser inlet air temperature of air-cooled units shall be the average reading of at least four temperature measuring instruments placed in a position that can indicate the average air temperature. It may also be measured using a sampling device. 9.2.4 Each temperature measuring instrument for the condenser inlet air of an air-cooled unit shall avoid heat radiation. 9.2.5 The unit shall take readings after the temperature of each test condition and each measuring point has stabilized. 9.3 Measuring instruments and accuracy requirements
The measuring instruments used for the test shall be within the valid use period and be accompanied by a certificate of compliance recently calibrated by the relevant departments. 9.3.1 Temperature measuring instruments and accuracy
9.3.1.1 Instruments: glass mercury thermometer, resistance thermometer, thermocouple. 9.3.1.2 Accuracy:
a) The inlet and outlet temperatures of brine or water, refrigerant in the calorimeter, with an accuracy of ±0.1°C; b) The cooling water temperature in the condenser, with an accuracy of ±0.1°C; c) The air temperature and wet bulb temperature, with an accuracy of ±0.1°C; d) All other temperatures, with an accuracy of ±0.3°C. 9.3.2 Pressure measuring instruments and accuracy
9.3.2.1 Instruments: Mercury column atmospheric pressure gauge, U-type differential pressure gauge, Bourdon tube pressure gauge, pressure sensor, etc. 9.3.2.2 Accuracy
a) All pressure measuring instruments shall have an accuracy within ±1%; b) Differential pressure gauges with a reading less than 250mm liquid column height shall not be used; c) The range of the pressure gauge shall be selected so that the indicated pressure value is between 1/3 and 2/3 of the full scale; d) The vapor pressure of the refrigerant shall be measured on a straight pipe section at least 150mm and not less than 4 times the pipe diameter in front of the unit suction port to determine the saturated suction temperature of the incoming refrigerant. 9.3.3 Electrical measuring instruments and accuracy
9.3.3.1 Instruments: voltmeter, ammeter, power meter (indicating or integrating), frequency meter, etc. 9.3.3.2 Accuracy;
a) Indicating instruments, accuracy within 0.5% of full scale reading; b) Integrating instruments, accuracy within ±1% of the measured value; c) Frequency meters, accuracy within ±0.5%. 9.3.4 Flow measurement instruments and accuracy
9.3.4.1 Instruments: liquid flow meter, liquid dosing meter, flow throttling device. 9.3.4.2 Accuracy
a) The accuracy is within ±2% of the measured value; b) The design, manufacture, installation and calculation of the flow throttling device shall comply with the provisions of GB/T2624. 9.3.5 Speed measurement instruments and accuracy
9.3.5.1 Instruments: tachometer, tachometer, flash frequency meter, etc. 9.3.5.2 Requirements: The accuracy is within ±1% of the measured speed. 9.3.6 Time measurement
Use a stopwatch to measure, with an accuracy of ±0.1% of the measured elapsed time. 9.3.7 Weight measurement
Use a platform scale or weighing scale to measure, with an accuracy of ±0.2% of the measured weight. 579
10 Performance test method
JB/T9056—1999
The performance test of the unit can be carried out by one of the following methods: second refrigerant calorimeter method, secondary fluid calorimeter method, dry refrigerant calorimeter method, suction refrigerant vapor flowmeter method, water-cooled condenser method, refrigerant liquid flowmeter method. 10.1 Second refrigerant calorimeter method (Figure 1) 10.1.1 Construction of the device
10.1.1.1 The second refrigerant calorimeter consists of a group of direct evaporation coils as the main evaporator. The evaporator is suspended on the top of an insulated pressure vessel. The bottom of the vessel contains a volatile second refrigerant (R11 or R12) and a heater device for heating the second refrigerant liquid. 10.1.1.2 The flow of the first refrigerant is controlled by an expansion valve installed close to the calorimeter. The refrigerant pipeline between the expansion valve and the calorimeter should be insulated.
10.1.1.3 The heat leakage of the calorimeter shall not exceed 5% of the nominal cooling capacity of the unit. 10.1.1.4 The calorimeter shall have a device for measuring the pressure of the second refrigerant. F2
Compressor
Calorimeter
Condenser
hr2 hf
hg2 hgl
10.1.1.5 The calorimeter shall be equipped with a safety switch to stop heating the second refrigerant when the rated pressure is exceeded. 10.1.2 Calibration of the device
10.1.2.1 Adjust the electric heating amount input to the second refrigerant so that the saturation temperature corresponding to the second refrigerant pressure is about 15°C lower than the ambient temperature. The ambient temperature should be kept below 32°C at any temperature, and the temperature fluctuation should not exceed ±1°C. 10.1.2.2 Keep the electric heating amount input to the second refrigerant constant, and measure the pressure every 1 hour until the corresponding saturation temperature fluctuation does not exceed ±0.5°C for four consecutive times.
10.1.2.3 The heat leakage coefficient is calculated according to formula (1): 580
JB/T90561999
10.1.2.4 The heat leakage during the unit test is calculated according to formula (2): Qa = Ki(ta - t)
Wherein: K
Heat leakage coefficient of calorimeter, W/K;
Heat input of calorimeter, W;
Saturation temperature of the second refrigerant, C;
fa\-Average ambient temperature around the calorimeter, C; Q.-Heat leakage of the calorimeter, W.
10.1.3 Adjustment method and requirements for test conditions 10.1.3.1 The unit suction pressure corresponding to the refrigerant saturation temperature is adjusted by the expansion valve. 10.1.3.2
The suction temperature of the refrigerant vapor is adjusted by the amount of heat input to the second refrigerant. 10.1.3.3 During the test period, the fluctuation of the heat input to the calorimeter shall not exceed ±1% of the unit's cooling capacity. 10.1.3.4 After the test conditions are determined, the following data should be recorded: a) The refrigerant vapor pressure and temperature at the evaporator outlet; b) The liquid refrigerant pressure and temperature at the expansion valve inlet; c) The ambient temperature of the calorimeter;
d) The pressure of the second refrigerant;
e) The amount of electric heat input to the calorimeter.
10.1.4 Measurement method and requirements
Measurement shall be made every 15 minutes, and the test shall continue until four consecutive readings are within the range specified in 9.2.1. 10.1.5 The cooling capacity is calculated according to formula (3):
hal-hn ×(Qn+Q)×
hg2 ht
wherein: Q is the cooling capacity of the unit, W
is the specific flame of the refrigerant vapor entering the unit under the specified operating conditions, J/kg; hg2 is the specific melting point of the refrigerant vapor at the outlet of the calorimeter, J/kg; h is the specific flame of the refrigerant liquid leaving the unit, J/kg; hg2 is the specific melting point of the refrigerant liquid at the inlet of the expansion valve, J/kg; V is the actual specific volume of the refrigerant vapor entering the unit, m2/kg; Vg!
is the specific volume of the refrigerant vapor entering the unit under the specified operating conditions, m2/kg. 10.2 Secondary Fluid Calorimeter Method (Figure 2)
10.2.1 Apparatus Construction
(3)
10.2.1.1 The calorimeter consists of two independent fluid circuits for heat exchange. The liquid refrigerant flows through the inner circuit to evaporate and superheat. The heating medium flows through the outer circuit to provide the heat required for evaporation and superheating. a) When water vapor, water or brine is used as the heating medium, the calorimeter shall be made into a concentric tube type: b) When water and brine are used as the heating medium, the calorimeter shall be made into a liquid cooler with a set of direct evaporation refrigerant coils, and the coils are immersed in a second fluid in a container. 10.2.1.2 The flow rate of the refrigerant is controlled by an expansion valve installed close to the calorimeter. The refrigerant pipeline between the expansion valve and the calorimeter shall be insulated. 10.2.1.3 The heat leakage of the calorimeter shall not exceed 5% of the nominal cooling capacity of the unit. 70.2.2 Calibration of the device
10.2.2.1 The heat leakage of the calorimeter is determined by the flow rate of the heating medium circulating in the outer loop of the calorimeter. 581
Calorie
Heating capacity
JB/T9056—1999
Compressor
Cold shock
a) When water or brine is used as the heating medium, the temperature difference between the inlet and outlet of the water or brine should not be less than 6°C. At this time, the ambient temperature should be within ±1°C of any temperature below 32°C. The inlet temperature of the water or brine should be 17°C higher than the ambient temperature. The test should be carried out continuously and the flow rate should be kept constant. Measure once every 1h until the fluctuation of the inlet and outlet temperatures of the water or brine measured for four consecutive times is no more than ±1°C.
b) When water vapor is used as the heating medium, the condensate collected from the heating medium circuit is used to determine the heat leakage of the calorimeter. The water vapor pressure should be maintained within ±4kPa of any value. At this time, the ambient temperature should be within ±1℃ of any temperature below 32℃. The superheat of the water vapor entering the calorimeter should be maintained at not less than 5℃, and the condensate should be supercooled to prevent the loss of the collected condensate due to evaporation. The average temperature of the outer surface of the concentric tube is measured by at least 10 equidistantly distributed temperature measuring instruments. The test should be continued, measured every 1h, until the difference between four consecutive condensate readings does not exceed ±10%. 10.2.2.2 The heat leakage coefficient is calculated according to formula (4) and formula (5): a) When water or salt water is used:
mic(ti — ta)
Kt = 0.5 ×(- t) - t.
b) When steam is used:
Kt (hu = ha) Xm
(t- ta)
10.2.2.3 The heat leakage during the unit test is calculated according to formula (6) and formula (7): a) When water or salt water is used:
Q Kt × [0.5 × (t2 + t)] b) When steam is used:
Q = Ki(te - ta)
where: mt.-flow rate of circulating water or brine, kg/s; specific heat capacity of water or brine at 20℃, J/(kg·K); t,
temperature of water or brine at the inlet of calorimeter, C; temperature of water or brine at the outlet of calorimeter, ℃; t-—average temperature of the outer surface of the concentric tube, ℃; hs! —specific flame of water vapor entering the calorimeter, J/kg; h2specific flame of condensed water at the outlet temperature, J/kg582
（4）
·（5）
(（6）
flow rate of condensed water, kg/s.
10.2.3 Adjustment method and requirements for test conditionsJB/T 9056—1999
10.2.3.1 The unit suction pressure corresponding to the refrigerant saturation temperature is adjusted by the expansion valve. 10.2.3.2 The suction temperature of the refrigerant vapor is adjusted by the electric heating input to the secondary fluid. 10.2.3.3 When water or brine is used as the heating medium, the temperature fluctuation of the water or brine entering and leaving the calorimeter shall not exceed ±0.1C, and the flow fluctuation of the circulating water or brine through the calorimeter shall not exceed 0.5%. 10.2.3.4 When water vapor is used as the heating medium, the superheat of the steam entering the calorimeter shall not be less than 5 ℃, and at the same time, prevent the loss of condensed water due to evaporation.
10.2.3.5 After the test conditions are determined, the following data should be recorded: a) refrigerant vapor pressure and temperature at the evaporator outlet; b) liquid refrigerant pressure and temperature at the expansion valve inlet; c) ambient temperature of the calorimeter;
d) when water or brine is used, the temperature of the water or brine inlet and outlet of the calorimeter, and the flow rate of circulating water or brine; e) when water vapor is used, the water vapor temperature at the calorimeter inlet, the water vapor pressure in the calorimeter, the condensed water temperature and flow rate at the calorimeter outlet, and the surface temperature of the steam pipe.
10.2.3.6 Measurements should be taken every 15 minutes, and the test should continue until four consecutive readings are within the range specified in 9.2.1. 10.2.3.7 The fluctuation of the pressure and temperature of the heating medium during the test should not be large enough to cause the change in the unit's cooling capacity to exceed ±1%. 10.2.4 Calculation of cooling capacity
10. 2. 4.1
10. 2. 4. 2
When water or brine is used, the cooling capacity is calculated according to formula (8): ×[mc ×(t -)+Q]×
h — ht
When water vapor is used, the cooling capacity is calculated according to formula (9): h=h×[m. ×(hol— ha)+Q] ×
hgz2 — htz2
10.3 Dry refrigerant calorimeter method (Figure 3) Calorimeter
10.3.1 Construction of the device
Compressor
Refrigerator
(8)
10.3.1.1 The calorimeter is composed of a tubular sealed pressure vessel of appropriate length and diameter to meet the evaporation of the refrigerant circulating in the unit under test. The tubular vessel should be electrically insulated, with a tubular electric heater installed in the tubular vessel and a linear heater wrapped around the outside of the vessel.
10.3.1.2 The refrigerant flow is controlled by an expansion valve installed close to the calorimeter. The refrigerant pipeline between the expansion valve and the calorimeter should be insulated. 583
JB/T9056—1999
10.3.1.3 The heat leakage of the calorimeter should not be greater than 5% of the nominal cooling capacity of the unit. 10.3.1.4 When a heater is installed on the outer surface of a tubular pressure vessel, the electrically insulated outer surface of the heater and the outer surface of the bonding material when bonding material is used should be equipped with at least 10 equidistantly distributed temperature measurement points to determine the average surface temperature of the vessel. 10.3.2 Calibration of the deviceWww.bzxZ.net
10.3.2.1 The heater of the tubular pressure vessel should provide sufficient heat to make the surface temperature of the evaporator 15°C higher than the ambient temperature. 10.3.2.2 When an electric heater is installed in a tubular pressure vessel, the evaporator should be filled with refrigeration oil for calibration, and then the oil should be drained and thoroughly cleaned.
10.3.2.3 The test environment temperature shall be maintained within ±1°C of any temperature below 32°C, and shall be measured every 1 hour until the average difference of four consecutive times is no more than ±0.5°C.
10.3.2.4 The heat leakage coefficient shall be calculated according to formula (10): KL:
10.3.2.5 The heat leakage during the unit test shall be calculated according to formula (11): Qh
Qa KX (ts - t)
Where: t
The average surface temperature of the pipe (when the heater is installed outside, it is the average surface temperature of the heater), °C. 10.3.3 Adjustment method and requirements for test conditions 10.3.3.1 The unit suction pressure corresponding to the refrigerant saturation temperature is adjusted by the expansion valve. 10.3.3.2 The suction temperature of the refrigerant vapor is adjusted by the heat of the electric heater. 10.3.3.3 During the test, the fluctuation of the heat input to the calorimeter shall not exceed ±1% of the cooling capacity of the unit. 10.3.3.4 After the test conditions are determined, the following data shall be recorded: a) refrigerant vapor pressure and temperature at the evaporator outlet; b) liquid refrigerant pressure and temperature at the expansion valve inlet; c) ambient temperature of the calorimeter;
d) heat input to the calorimeter;
e) average surface temperature of the pipe (when the heater is installed outside, it is the average surface temperature of the heater). (10)
10.3.3.5 Measurements shall be taken every 15 minutes, and the test shall continue until four consecutive readings are within the range specified in 9.2.1. 10.3.4 Refrigeration capacity is calculated according to formula (12):
hlha ×(Q.+Q）)×
10.4 Refrigerant vapor suction flow meter method (Figure 4) 10.4.1 Device construction
h2 —hf2
10.4.1.1 The refrigerant vapor suction flow meter is composed of a nozzle or orifice type flow measurement throttling device, which is used to measure the volume flow rate of the refrigerant vapor flowing through.
a) The refrigerant vapor temperature and pressure before the throttling device; b) The pressure drop before and after the throttling device.
10.4.1.2 The throttling device should be installed on the suction side pipeline of the unit and in a closed system composed of a compressor, condenser, etc.
10.4.1.3 When flowing through the throttling device, it should be ensured that the refrigerant vapor is evenly superheated and completely free of droplets. 10.4.1.4 In order to reduce or eliminate the pulsation of the inhaled refrigerant vapor flow, a pulsation buffer should be installed on the suction side pipeline. 10.4.2 Adjustment method and requirements for test conditions 10.4.2.1 The unit suction pressure corresponding to the refrigerant saturation temperature is adjusted by the expansion valve. 584
Evaporator
Throttling device
JB/T 9056—1999
Pulsation buffer device
10.4.2.2 The unit suction temperature is adjusted by changing the evaporator load. 10.4.2.3 After the test conditions are determined, the data to be recorded are: a) Refrigerant vapor temperature before the throttling device; b) Pressure drop before and after the throttling device.
Compressor
Condenser
10.4.2.4 Measure once every 15 minutes. The test shall be continued until four consecutive readings are within the range specified in 9.2.1. 10.4.3 Refrigeration capacity is calculated according to formula (13):
tWhere: m-
-hn)× m×V
Q=（hg)
Refrigerant flow measured by the throttling device, kg/s. 10.5 Water-cooled condenser method (Figure 5)
10.5.1 Instructions and requirements
10.5.1.1 The water-cooled condenser method is only applicable to water-cooled units. 10. 5. 1. 2
The heat leakage of the condenser shall be less than 2% of the unit's refrigeration capacity. g1
compressor
purifier
evaporator
10.5.1.3After the test conditions are determined, the following data should be recorded: a) pressure and temperature of the refrigerant vapor entering the condenser; b) pressure and temperature of the refrigerant liquid leaving the condenser; Figure 5
+log p
hti hra
hg3 hg1
. (13)3 After the test conditions are determined, the following data should be recorded: a) Refrigerant vapor temperature before the throttling device; b) Pressure drop before and after the throttling device.
Compressor
Condenser
10.4.2.4 The test should be continued every 15 minutes until four consecutive readings are within the range specified in 9.2.1. 10.4.3 Refrigeration capacity is calculated according to formula (13):
tWhere: m-
-hn)× m×V
Q=（hg)
Refrigerant flow measured by the throttling device, kg/s. 10.5 Water-cooled condenser method (Figure 5)
10.5.1 Instructions and requirements
10.5.1.1 The water-cooled condenser method is only applicable to water-cooled units. 10.5.1.2
The heat leakage of the condenser should be less than 2% of the cooling capacity of the unit. g1
Compressor
Condenser
Evaporator
10.5.1.3 After the test conditions are determined, the data to be recorded are: a) the pressure and temperature of the refrigerant vapor entering the condenser; b) the pressure and temperature of the refrigerant liquid leaving the condenser; Figure 5
+log p
hti hra
hg3 hg1
. (13)3 After the test conditions are determined, the following data should be recorded: a) Refrigerant vapor temperature before the throttling device; b) Pressure drop before and after the throttling device.
Compressor
Condenser
10.4.2.4 The test should be continued every 15 minutes until four consecutive readings are within the range specified in 9.2.1. 10.4.3 Refrigeration capacity is calculated according to formula (13):
tWhere: m-
-hn)× m×V
Q=（hg)
Refrigerant flow measured by the throttling device, kg/s. 10.5 Water-cooled condenser method (Figure 5)
10.5.1 Instructions and requirements
10.5.1.1 The water-cooled condenser method is only applicable to water-cooled units. 10.5.1.2
The heat leakage of the condenser should be less than 2% of the cooling capacity of the unit. g1
Compressor
Condenser
Evaporator
10.5.1.3 After the test conditions are determined, the data to be recorded are: a) the pressure and temperature of the refrigerant vapor entering the condenser; b) the pressure and temperature of the refrigerant liquid leaving the condenser; Figure 5
+log p
hti hra
hg3 hg1
. (13)
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