Some standard content:
Mechanical Industry Standard of the People's Republic of China
Combined Heat Source Heat Pump Screw
Chiller
1 Subject Content and Scope of Application
JB/T 7227-94
This standard specifies the terminology, product classification, technical requirements, test methods, inspection rules, marking, packaging and storage of composite heat source heat pump screw chillers.
This standard applies to composite heat source heat pump screw chillers (hereinafter referred to as units) that use R22 as refrigerant and can be used for cooling and heating.
2 Reference standards
GR1032
Packaging, storage and transportation pictorial symbols
Basic technical requirements for rotating electrical machines
Test methods for three-phase asynchronous motors
Flow measurement throttling devices
GB2624
GB 6388
GB 7373
GB7786
GB10875
Transport packaging delivery and receipt markings
Industrial use of difluoromonofluoromethane (F22)
Noise sound power level limits for power air compressors and diaphragm compressors Medium-sized piston single-stage refrigeration compressors
, technical conditions
GB/T 13306
GBJ50 Design specification for industrial circulating cooling water treatment JB/F 6906
JB/T 6917
JB4329
JB4330
Oil-injected screw single-stage refrigeration compressor
Pressure vessel for refrigeration equipment
Technical conditions for screw chillers
Engineering method for determination of sound power level of noise in refrigeration and air-conditioning equipment ZBE34033 Refrigeration oil
ZB J73 040
Electrical control equipment for refrigeration compressor units
3 Terms
3.1 General technical conditions for composite heat source heat pump type screw chillers
Liquid cooling unit with water as refrigerant and screw refrigeration compressor. In addition to refrigeration, it can also change the flow direction of the fluid so that the evaporator absorbs heat from more than two heat sources such as air and water at the same time, and releases heat through the condenser to heat certain spaces or objects (see Figure 1 for the schematic diagram).
Approved by the Ministry of Machinery and Electronics Industry of the People's Republic of China on July 18, 1994, and implemented on July 1, 1995
4 Product classification
JB/T 7227-94
1 Screw refrigeration compressor; 2-Water-cooled condenser; 3-Throttle valve + 4-Evaporator; 5 Air-cooled condenser; 6 Diverter; 7
Three-way valve: 8 Solenoid main valve
4.1 The unit can be divided into open type and semi-closed type according to the structure of its compressor. 4.2 The unit can be divided into single heat source type and composite heat source type according to its heat source (outdoor heat source is air, sun, etc., and indoor heat source is water). 5 Technical requirements
5.1 General requirements
The unit should comply with the provisions of this standard and be manufactured according to the drawings and technical documents approved by the prescribed procedures, or it can be manufactured according to the agreement between the user and the manufacturer.
5.2 Maximum load operating conditions
The unit should be able to operate normally for a long time under the following maximum load operating conditions. 5.2.1 Maximum load operating conditions for cooling
Maximum ambient temperature: 43C;
b. Maximum water inlet temperature of water-cooled condenser: 33℃; Maximum water outlet temperature of evaporator: 15℃. c.
5.2.2 Maximum load operating conditions for heating
Minimum ambient temperature: -8℃+
JB/T 7227-94
Maximum water outlet temperature of water-cooled condenser: 50C; Minimum water outlet temperature of evaporator: 2C.
5.3 Nominal operating conditions
Nominal operating conditions for cooling of the unit
Evaporator cold water outlet temperature: 7℃;
Condenser hot water (cooling water) inlet temperature: 32C; cold water flow rate per unit cooling capacity: 0.172m2/(h·kW); hot water (cooling water) flow rate per unit cooling capacity: 0.258m2/(h·kW). 5.3.2·Nominal operating conditions for heating of the unit
Water-cooled condenser hot water (cooling water) outlet temperature: 45C; evaporator cold water inlet temperature: 10℃, hot water (cooling water) flow rate per unit heating capacity: 0.258m/(h·kW); cold water flow rate per unit heating capacity: 0.172m2/(h·kW), air inlet temperature of air-cooled condenser: dry bulb temperature is 8℃, wet bulb temperature is 6℃. 5.4 Scope of use of the unit
5.4.1 Scope of use for cooling
Cold water outlet temperature: 4~15℃;
Cooling water inlet temperature: 20~33℃.
5.4.2 Scope of use for heating
Hot water outlet temperature: 35~~50℃;
Cold water outlet temperature: not less than 4℃.
5.5 Fouling coefficient
The fouling coefficient of the cold water side and hot water (cooling water) side of the unit is 0.172m2.℃C/kW. 5.6 Tolerance of nominal cooling capacity and heating capacity5.6.1 Tolerance of nominal cooling capacity
When the nominal cooling capacity of the unit is less than or equal to 240kW, the tolerance is -7%; when the nominal cooling capacity of the unit is greater than 240kW, the tolerance is 5%.
5.6.2 The nominal working condition heating supply difference is -5% 5.7 Nominal working condition cooling and heating coefficient
The nominal working condition cooling coefficient of the unit shall not be less than 4, and the heating coefficient shall not be less than 3. 5.8 The adjustment range of cooling (heating) capacity
The adjustment range of cooling (heating) capacity is 15% to 100%. 5.9 Noise value
The noise value of the unit under the nominal working condition of cooling (heating) shall not exceed the provisions of Table 1. 5.10 Vibration value
When the unit base is fixed, the vibration value of the unit shall be below 25um. 5.11 Power supply voltage deviation
When the power supply voltage deviation is -10% to +5% of the rated value, it should be ensured that the unit can start and operate normally. 667
Positive rotor speed
Positive rotor nominal diameter
Rotor aspect ratio
Open type
Semi-enclosed type
5.12 Lubricating oil
JB/T 7227---94
The lubricating oil used in the unit shall comply with the provisions of ZBE34003. 5.13 Refrigerant
The R22 refrigerant used in the unit shall comply with the provisions of GB7373. 5.14 Water quality
The water quality used in the unit shall comply with the provisions of GBJ50. 5.15 Heat exchanger water side resistance
The water side resistance of the unit heat exchanger (oil cooler, condenser and evaporator) shall not be greater than 0.1MPa under nominal working conditions. 5.16 Air tightness
The unit shall be airtight and shall not leak refrigerant. When the open type unit is running, the oil seepage at the compressor shaft seal should not exceed 3mL/h. 5.17 Cleanliness
The refrigerant circulation system of the unit should be clean. The cleanliness of the unit's refrigeration compressor should comply with the provisions of Table 2. The cleanliness per unit area of the unit's heat exchanger, liquid receiver, oil separator, oil receiver, valve and connecting pipes should not exceed 800mg/m2, where the heat exchanger is calculated based on its heat exchange area, and the liquid receiver, oil separator, oil receiver, valve and connecting pipes are calculated based on their inner surface area. Table 2
Nominal diameter of male rotor, nrm
Rotor aspect ratio
Cleanliness, mg
5.18 Lubrication system
The lubrication system of the unit should have reliable oil supply and ensure clean oil supply. 5.19 Safety protection device and electrical control element 1
The safety protection device of the unit should be sensitive and reliable, and the electrical control element should operate correctly. 5.20 Refrigeration compressor
The screw refrigeration compressor of the unit shall comply with the provisions of JB/T6906. 5.21 Auxiliary equipment
The auxiliary equipment of the unit shall comply with the provisions of the corresponding standards, and the pressure vessels shall be designed and manufactured in accordance with the provisions of JB/T6917. 5.22 Motor
The motors matched with the open type unit shall comply with the provisions of GB755 and GB1032; the motors matched with the semi-enclosed unit shall comply with the provisions of Appendix B of GB10875.
5.23 Control cabinet
The control cabinet matched with the unit shall be manufactured in accordance with the provisions of ZBJ73040. 5.24 Safety protection
The safety protection of the unit shall at least include:
Condensing pressure is too high protection;
b.: Cold water outlet temperature is too low protection;
Oil temperature is too high protection;
Precision filter pressure difference is too high protection;
e.Main motor overload protection;
f. Low cold water flow protection.
5.25 Appearance quality
JB/T 7227-94
The unit should be beautiful and elegant, the casting surface should be smooth and flat, the paint color should be harmonious and durable, and the pipeline connection should be simple and neat. 5.26 Reliability requirements
5.26.1 The trouble-free operation requirements of the unit should comply with the provisions of the relevant reliability standards. 5.26.2 The mean trouble-free operation time MTBF of the unit should be no less than 15,000 hours. 5.27 Ancillary equipment
The unit should be supplied as a complete set, including wearing parts, spare parts and special tools in addition to the unit. 5.28 Quality Assurance Period
Provided that the user complies with the rules for transportation, storage, installation and use of the product, within 18 months from the date of shipment from the manufacturer, and the actual working time of the unit does not exceed 8000 hours, if the unit is damaged or cannot work normally due to poor manufacturing (except for wearing parts), the manufacturer shall replace or repair it free of charge.
6 Test Method
6.1 Airtightness Test
Fill the system of the unit with dry, clean air or nitrogen, and the filling pressure is 1.6MPa (gauge pressure). Maintain the pressure for 1 hour, and use foaming liquid or other methods to check each joint. There should be no leakage. The airtightness test of the indoor and outdoor parts of the unit can be carried out separately. 6.2 Refrigerant Load Operation Test
The unit is operated continuously for 1 hour under the nominal condition close to cooling (heating). Check the action of the safety protection device and electrical control components. It should comply with the provisions of Article 5.19.
6.3. Noise measurement
At rated voltage, rated frequency and nominal cooling (heating) conditions, the noise shall be measured in accordance with JB4330 and converted into sound pressure level in accordance with GB7786. The result shall comply with the provisions of Article 5.9. 6.4 Vibration value measurement
At rated voltage, rated frequency and nominal cooling (heating) conditions, the measurement shall be carried out with reference to Appendix A of JB4329. The result shall comply with the provisions of Article 5.10.
6.5 Cleanliness measurement
After the type inspection or random inspection of the unit, the dedicated refrigerant liquid pipeline drying filter (100μm filter screen) shall be disassembled and cleaned, and the mass of the impurity content stored shall be weighed, which is the cleanliness of the unit. 6.6 The net cooling capacity and net heating supply test under nominal conditions shall be carried out at rated voltage and rated frequency in accordance with the conditions specified in Article 5.3 to determine the net cooling capacity, total input power, cooling coefficient, water volume and water-side resistance of the unit under nominal conditions, and the net heating supply, water volume, total input power, heating coefficient, water volume and water-side resistance of the heat exchanger under nominal conditions. 6.7 Partial load operation test
For units with energy regulation devices, three-level partial load operation tests of 25%, 50% and 75% shall be carried out to measure the cooling capacity and input power under nominal conditions, and the heating supply and input power under nominal conditions. 6.8 Maximum load operation test
6.8.1 The maximum load operation test of the unit shall be carried out in accordance with Article 5.2. 669
JB/T 7227—94
6.8.2 When the power supply voltage is 90% to 105% of the rated voltage, the unit should be able to start normally and run for at least 1 hour. 6.9 Full performance test
6.9.1 Measure the cooling capacity and total input power of the unit at different condenser water inlet (air inlet) temperatures (not less than three points) and different evaporator water outlet temperatures (not less than five points each).
6.9.2 Measure the heating capacity and total input power of the unit at different evaporator water outlet temperatures (not less than three points) and different condenser water outlet temperatures (not less than five points each).
6.9.3 The water volume during the test of the water-cooled unit is the same as the water volume during the nominal operating condition. 6.9.4 Draw a full performance curve chart of the unit based on the values measured in Articles 6.9.1 and 6.9.2. 6.10 Determination of net cooling capacity and net heating supply 6.10.1 The determination methods of the net cooling capacity and net heating supply of the unit are both based on the liquid refrigerant method, but two sets of measurements should be carried out, and the interval between the two sets of measurements should be at least 1 hour.
6.10.2 The test device for determining the net cooling capacity of the unit is shown in Figure 2. The water volume measuring device of the test device is located at the cold water inlet of the unit evaporator, and the cold water inlet and outlet water volume regulating valves of the test device are respectively located at the cold water inlet and outlet of the unit evaporator. ! Unit
1—Flow regulating valve; 2—Flowmeter; 3—Condenser 6.10.3 The test device for determining the net heating supply of the unit is shown in Figure 3. The water volume measuring device of the test device is located at the hot water (cooling water) inlet of the unit condenser, and the hot water inlet and outlet water volume regulating valves of the test device are respectively located at the hot water (cooling water) inlet and outlet of the unit condenser 6.10.4 The test device should also be equipped with additional devices that can provide continuous and stable cold and hot water flow and adjust the water temperature of the test condition. 6.10.5 Before the test, the non-condensable gas in the unit's refrigeration system should be removed and it should be confirmed that there is no refrigerant leakage. There should be enough refrigerant in the unit's refrigeration system, and the refrigerant should comply with the provisions of Article 5.13. 6.10.6
There should be enough lubricating oil in the unit's oil system, and the lubricating oil should comply with the provisions of Article 5.12. The unit test system should be equipped with necessary thermometer sleeves. 6.10.8
The test equipment and instruments of the unit test device should not hinder the normal operation and operation of the unit. 6.10.10 The unit's refrigeration system, oil system and water system should be cleaned before testing. 6. 10. 11
During the test, the allowable deviation of the unit test parameters should comply with the provisions of Table 3. Machine
1—Flow regulating valve: 2—Flowmeter; 3—Condenser Main test parameters
Cold and hot water inlet and outlet temperature
Cold and hot water inlet and outlet temperature difference
Cold and hot water mass flow
Power supply voltage
Power supply frequency
JB/T 7227—94
The maximum allowable deviation between each measured value and the specified value
The maximum allowable deviation of any reading of the measured value relative to the average value
6.10.12 The measurement should be carried out after the unit reaches a stable working state, and the test time is generally not less than 2 hours. The measurement data should be recorded after the test condition stabilizes for 1 hour, and the measurement should be measured every 20 minutes for ~ times until the four consecutive measurement data meet the requirements of Table 3. 6.10.13 All measurement values should be calculated based on the average value of four consecutive measurements. 6.10.14 The net cooling capacity and net heating capacity of the unit shall be calculated according to formula (1) and formula (2) respectively: Net cooling capacity:
Qn. = qmrc(tel - t2) + Qc
Net heating capacity:
Qnh = 9mhc(te2 ter)
Where: Qnr——
Net cooling capacity of the unit, W;
Qnh Net heating supply of the unit, W
qmr-Cold water mass flow rate, kg/s
Hot water mass flow rate, kg/s;
Specific heat of water at average temperature, J/(kg·℃);tet
Evaporator cold water inlet temperature, C;
Evaporator cold water outlet temperature, C;
Condenser hot water inlet temperature, C;
-Condenser hot water outlet temperature, C;Www.bzxZ.net
Correction term for the heat transferred from ambient air to the cold water side of the dry evaporator, W. Q
For a flooded evaporator, the heat transferred from ambient air to the refrigerant side is not included in the cooling capacity. When the dry evaporator is insulated, Q in formula (1) can be ignored. When there is no insulation, Q. Determined by formula (3): Q. = KA(t. - tm)
Wherein: K
·(2)
(3)
The heat transfer coefficient between the outer surface of the evaporator and the ambient air, W/(m2.C) [K=7W/(m2,℃) can be taken]; A—the surface area of the evaporator, m2
The ambient air temperature, ℃;
The average value of the inlet and outlet temperatures on the cold water side of the dry evaporator, ℃. Im
6.10.15 The test instrument shall be calibrated and qualified by the metrology department or relevant departments, and its qualification certificate shall be within the valid use period. The provisions on measuring instruments and their accuracy are shown in Appendix A (Supplement). 6.11 Total input power of the unit
6.11.1 The total input power of the unit is the sum of the input power of the main motor, oil pump motor, and air-cooled condenser fan motor. 6.11.2 The input power of the motor should be measured at the motor input terminal. The input power of a three-phase AC motor is measured using the "two-power meter" method or the "three-power meter" method. The measuring instrument and accuracy shall be in accordance with the provisions of Appendix A. 6.11.3 The input power of the motor is calculated by formula (4): NEP
(4)
Where: N—motor input power,W;
P—The power measured by each power meter, W. 6.12 Unit cooling and heating coefficients
JB/T 7227--94
The unit cooling and heating coefficients are calculated according to formula (5) and formula (6) respectively: Cooling coefficient:
Heating coefficient:
COPh =
Where: COP,
Cooling coefficient;
Heating coefficient;
Net cooling capacity of the unit, W
Net heating capacity of the unit, W,
Total input power of the unit when cooling, W;
Total input power of the unit when heating, W.
6.13 Determination of water side resistance
(5)
(6)
6.13.1 When measuring the water side resistance of the unit heat exchanger (oil cooler, condenser and evaporator), the length of the straight pipe extending from the water inlet and outlet sides of the heat exchanger shall be at least four times the diameter of the pipe, and the measuring hole shall be set at a length twice the diameter of the pipe. 6.13.2 When installing the connecting pipe for pressure testing on the straight pipe extending from the water inlet and outlet sides of the heat exchanger of the unit under test, the length of the connecting pipe shall be more than twice the diameter of the test hole, and the connecting pipe shall be installed vertically on the test hole. The test hole mouth shall be smooth and flat, without defects such as burrs and curling. 6.13.3 Before testing, the air in the connecting pipe between the instrument and the pressure test hole shall be exhausted and filled with clean water. When the unit is running under nominal conditions, at rated water volume, measure the pressure difference between the water inlet and outlet sides of the unit heat exchanger, and then reduce the water volume appropriately until the minimum water volume required for water cut protection is measured.
6.13.4 Water side resistance can be calculated according to formula (7) or formula (8) a.
When using a spring tube pressure gauge, the water side resistance is calculated according to formula (7): Apw = pw1 pw2
Where: w—-—ten thousand
Water side pressure loss, MPa;
pwi pw2
Oil cooler water side inlet and outlet pressure, MPa. When using a U-tube mercury differential pressure gauge, the water side resistance is calculated according to formula (8): b.
Apw = 0. 133 × Pe
Wherein: Apw——
water side pressure loss, MPa;
Pg——mercury density in the differential pressure gauge, kg/m3;
h.—Reading of the mercury column in the differential pressure gauge, m. 7 Inspection rules
General requirements
The parts, components and the entire unit of the unit shall be inspected by the technical inspection department of the manufacturer in accordance with this standard and relevant standards and technical documents, and can only be shipped after passing the inspection.
7.2 Inspection classification
The inspection of the unit is divided into factory inspection, type inspection and sampling inspection. The inspection items shall be in accordance with the provisions of Table 4. 672
Inspection items
Full performance test
Net cooling capacity under nominal conditions
Net heating capacity under nominal conditions
Maximum load operation test
Partial load operation test
Determination of water side resistance
Noise test
Determination of vibration value
Determination of unit cleanliness
Unit airtightness test
Refrigerant load operation test
Factory inspection
JB/T 7227—94
Type inspection
Sampling inspection
Note: During factory inspection and sampling inspection, one of the net cooling capacity under nominal conditions and the net heating capacity under nominal conditions can be selected for inspection according to the season. 7.3 Factory inspection
Each unit shall be inspected after assembly. After the unit passes the inspection, the refrigerant and lubricating oil should be released, and then the suction filter and oil filter should be disassembled and cleaned, and then the air tightness test should be repeated according to the provisions of Article 6.1. After passing the inspection, dry nitrogen should be filled, and the filling pressure should be 0.03~0. 05 MPa.
7.4 Type inspection
7.4.1 Each new product or finalized product should be subject to type inspection when there is a major change that affects the performance. 7.4.2 The type inspection time should be no less than 150h. 7.5 Sampling inspection
7.5.1 The units produced in batches should be subject to routine sampling inspection to check the stability of the production process. 7.5.2
The number of products of the same model produced in a year should be regarded as an inspection batch, and the sampling time should be evenly distributed throughout the year. If the annual output of the same model product is less than 30 units, 30 units can be accumulated as an inspection batch, and samples should be randomly selected from them. 7.5.3 The sampling plan is the sub-sampling plan specified in Table 5. Table 5
>50~100
>100500
Sample size n
7.5.4 The sampling inspection time should be no less than 24h. 8 Marking, packaging and storage
8.1 Marking
Qualified judgment number A.
Unqualified judgment number R.
8.1.1 Each unit should have a label fixed on a conspicuous and flat position, and the label size should comply with the provisions of GB/T13306. The following information should be marked on the unit's label:
Manufacturer's name;
Unit model and name:1. Repeat the airtightness test. After passing the test, fill with dry nitrogen with a pressure of 0.03~0. 05 MPa.
7.4 Type inspection
7.4.1 Each new product or finalized product shall be subject to type inspection when there is a major change that affects the performance. 7.4.2 The type inspection time shall be no less than 150 hours. 7.5 Sampling inspection
7.5.1 The units produced in batches shall be subject to routine sampling inspection to check the stability of the production process. 7.5.2
The number of products of the same model produced in a year shall be regarded as an inspection batch, and the sampling time shall be evenly distributed throughout the year. If the annual output of the same model product is less than 30 units, 30 units can be accumulated as an inspection batch, and samples shall be randomly selected from them. 7.5.3 The sampling plan shall be the sub-sampling plan specified in Table 5. Table 5
>50~100
>100500
Sample size n
7.5.4 The sampling inspection time should be no less than 24h. 8 Marking, packaging and storage
8.1 Marking
Qualified judgment number A.
Unqualified judgment number R.
8.1.1 Each unit should be fixed with a label in a conspicuous and flat position, and the label size should comply with the provisions of GB/T13306. The following information should be marked on the label of the unit:
Manufacturer's name;
Unit model and name:1. Repeat the airtightness test. After passing the test, fill with dry nitrogen with a pressure of 0.03~0. 05 MPa.
7.4 Type inspection
7.4.1 Each new product or finalized product shall be subject to type inspection when there is a major change that affects the performance. 7.4.2 The type inspection time shall be no less than 150 hours. 7.5 Sampling inspection
7.5.1 The units produced in batches shall be subject to routine sampling inspection to check the stability of the production process. 7.5.2
The number of products of the same model produced in a year shall be regarded as an inspection batch, and the sampling time shall be evenly distributed throughout the year. If the annual output of the same model product is less than 30 units, 30 units can be accumulated as an inspection batch, and samples shall be randomly selected from them. 7.5.3 The sampling plan shall be the sub-sampling plan specified in Table 5. Table 5
>50~100
>100500
Sample size n
7.5.4 The sampling inspection time should be no less than 24h. 8 Marking, packaging and storage
8.1 Marking
Qualified judgment number A.
Unqualified judgment number R.
8.1.1 Each unit should be fixed with a label in a conspicuous and flat position, and the label size should comply with the provisions of GB/T13306. The following information should be marked on the label of the unit:
Manufacturer's name;
Unit model and name:
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