JG/T 21-1999 Performance test methods for air coolers and air heaters
Some standard content:
1CS91.140.30
Construction Industry Standard of the People's Republic of China JG/T 211999
Air Cooler and Air Heater
Performance Test Methods
Test methods for determining the performanceof air cooling and air heatine coils1999-06-04 Issued
Promulgated by the Ministry of Construction of the People's Republic of China
1999-06-04 Implementation
JG21-1999
According to the requirements of the National Technical Supervision Bureau (No. 19981216), the Ministry of Construction approved the conversion of the national standards of the National Technical Supervision Bureau in 1992 and the product standards approved by the Ministry of Construction before 1992. The relevant standards have been cleaned up and rectified. The Ministry of Construction has confirmed and issued the standard 2—Air Cooler and Air Heater Performance Test Method with Document No. 54 of the Ministry of Construction Product Standard Cleanup and Rectification, and the new number is GT211s59
. In order to facilitate the implementation of the standard, only the original standard is maintained, and the above-line expressions of the book are corrected, and the original standard is reprinted and corrected after adding this error explanation. The People's Republic of China Construction Industry Industry Standard Air Cooler and Air Heater
Performance Test Method
'Iesi mcthods Tar delermining the performanceof ir couling aad wir heating cuils1 Topic table and applicable specifications
JC/T 21—1599
This standard specifies the performance test methods and requirements for forced flow surface air coolers and air heaters (hereinafter referred to as heat exchangers).
This standard is applicable to air coolers (or air heaters) with water as the medium and air heaters with steam as the medium. For air coolers with water or ethylene glycol as the medium, this standard can also be used for testing. This standard does not apply to transformers and condensers used in refrigeration systems. 2 Terminology
2.1 Forced flow surface air cooler Type: water-cooled air exchanger, which may have auxiliary plates on the frame, 2.2 Forced air heater
Forced air heater is a water-air or steam-air heat exchanger, which may or may not have auxiliary plates and heat-reducing steam in the tubes to heat the external moving air. 2.3 Potential balance
Thermal balance refers to the state when the deviation of the heat exchange between the air side and the water (or steam) side meets the limit values of 7.7. 2.4 Air loss
The heat loss of the air test refers to the full heat generated by the ideal insulation state in the test section. 2.5 Heat exchanger structure size
L heat exchanger length H heat exchanger pressure I positive E: British heat exchanger row medical exchanger size
Ministry of Construction of the People's Republic of China 1999-C6-04 approved 1999-06-4 implementation
2.5.1 Heat exchanger row number
Heat exchanger row number refers to the number of rows in the direction of the air flow. 2.5.2 Heat exchanger row number
JG/T 21:#999
Heat exchanger number of strokes or the number of single waterways that pass perpendicularly through the direction of air flow: 2.5.3 Heat exchanger number
Heat exchanger number of routes
Heat exchanger number of routes extending out of the heat exchanger header, 2.5.4 Windward front
Windward side refers to the product of the length and width of the windward side, as shown in Figure 1. 2.6 Standard state of air
The standard state of air refers to the state of air when the pressure is 20°C, the velocity is 101.3kPa, and the temperature is 1.2kg/m3. The test equipment
The test equipment is composed of the wind tunnel system and the water system (or the production system). This part is called the test section. The treatment section is mainly used to ensure the parameters of air and water required by the test. The test section must ensure the accuracy of the test data so as to provide reliable test data.
3.T The measuring device of the wind tunnel system
The wind tunnel system's central air volume, dry and wet bulb temperatures and air pressure are measured. 3.1.1 The wind tunnel system test must take the air with two pieces of sealing and two heat treatment methods. The air after the two heat treatment methods do not show the air just exchanged heat. When the heat head is less than 1%, the heat exchange efficiency can be corrected without reasonable heat exchange. The wind speed and the belt on the surface of the test piece shall be more or less. The difference between the maximum wind speed and the minimum wind speed on the section of the test piece before and after the test piece shall not exceed the minimum wind speed by 2: the relative air temperature at the point in the section shall not be greater than 0.6°C. 3.1.2 The air flow rate can be measured by a flow nozzle (see Appendix (Supplement) 1. The device can be installed in front of the heat exchanger test piece or after the heat exchanger test piece.
3.1.3 The dry and wet temperatures of the air entering and leaving the heat exchanger test piece should be measured by a sampling device (see Appendix (Supplement) 1. The selection of the device shall not cause obvious changes in the air flow and wind path. Heating measures must be taken for the exposed parts. The diameter of the sampling pipe section should not be less than 75m, and the pressure difference between the wind measuring point and the sampling point should not be 50DPa. Otherwise, the wet bulb should be properly pressure-stopped. For the heating test, it is also possible to take a self-collection. The static pressure temperature on the cross section of the test section is measured by evenly distributing the measuring elements on the surface of the test section. 3.1. In order to determine the pressure drop of the heat exchanger test piece, static pressure interfaces should be opened on the four walls of the test piece, and the test should be carried out by the device on the side. The static pressure interfaces should be opened on the upper and lower sides of the test piece, and the test piece should be at least 0.3 meters away. During the test, the bottom interface should be closed to prevent cold water from entering the static pressure interface and affecting the test results. The duct part should be equipped with a suitable drainage bend to remove cold water. The static pressure interface hole should be 13mm thick. The hole edge must be smooth and free of burrs, and should be connected to form a static pressure ring to measure the almost uniform static pressure value of the surface. Before connecting the static pressure ring, each static pressure interface should be measured to ensure that the difference between the individual readings of each interface is 10.5%. 3.1.5 When using the air duct system shown in Figure 2 The flow process of the air through the single-piece test chamber is as follows: h. The air after the treatment enters the air inlet through the humidifier and the equalizer plate (see Figure 2 of the attached figure). After the heat is removed, it enters the heat exchanger test piece. e. After the air passes through the heat exchanger test piece, it enters the mixing chamber (it can be subjected to the mixer and equalizer when necessary). e. After the air is mixed, it enters the air flow meter and is then discharged. d. The temperature and wave samples of the air should be divided into the air inlet chamber and Mixed wear near the inside. Original:
JG/T211999
Product limit six agricultural
Product limit market
1 Heat riser section; 2 Heat exchanger outlet section: Test equipment training air prison section; 1 Test station intelligent production room section 2 Air flow and humidity measuring device 3.2 Specification of water system A equipment
The water system is formed in the continent or causing water temperature and water pressure drop. 3.2.1 The water volume can be measured by a liquid flow meter. When using a liquid flow meter, there must be a calibrated instrument with a flow rate of at least 2 minutes. 3.2.2 The water temperature measuring instrument must be installed in a place where it can accurately measure the temperature of the test piece at the inlet and outlet. The temperature measuring instrument must be installed upstream of the test piece inlet pipe. If the water flow rate is large, two heads can be used as a mixing device to make the water mix. See Figure 3. 3.2.3 Use the pressure wave to determine the pressure drop of water from the heat exchanger inlet to the outlet. See Appendix E Figure 5.3.2.4 Use the device shown in the figure to measure the service parameters of the water-to-air heat exchanger. The meter
with the meter
, the pulse quantity is required, and the washing quantity
can be used to calculate the two
months.
Figure 3 Water parameter two-meter device
3.3 Measurement equipment of steam system
Measure the pressure, temperature, condensate temperature and condensate temperature of the steam in the steam system. 3.3.1 The steam bed and the temperature should be measured at the outlet of the test piece and the steam temperature should be calculated accordingly. The steam temperature flowing into the test piece should be at least 100000, and the water temperature should be the same. All the pipes between the temperature measuring position and the test piece must be measured. 3.3.2 The condensate temperature can be measured by the liquid meter according to the specified temperature. 3.3.3 The pressure drop from the inlet to the outlet of the test piece with steam should be determined by a mercury pressure gauge (as shown in Figure 4).This connected dynamometer pipeline must be traced back to the section filled with water liquid. When determining the steam pressure drop through the test piece, the influence of the static repulsion head should be checked: 3
Separation density
JGT21-1999
Yanqi Ri
Overheating gasket (install the lower steam seat when necessary
High steam seat
Master Photographer
Blowing off
Station This group built a
Transmission sample water device
Degree glass medical reduction gauge,
Over-stop is
Lack to low volume quantitative gauge||tt ||Charge water circuit
Mercury gauge
Condensate or river water
Figure 4. Parameters and flow rate of the best condensate 3.3.4 A steam-water separator must be installed upstream of the superheater and the regulator of the hot charging system. The condensate tank should use a suitable subcooler to prevent the re-evaporation of the condensate. It is also necessary to adjust the water level of the condensate. The water level of the condensate must be adjusted every time. At the top of the condensate or the water tank, a venting device must be installed to continuously form during the test: 3. 3. 5 Obtain the steam-air heat exchange data of various parameters, as well as the amount of condensate discharged during the heat exchange test, and use the pressure tester shown in Table 4.
4 Test Instruments
All instruments must be calibrated by the instrument department and qualified before they can be used. 4.1 Temperature measurement only
4.], 1 The accuracy of the temperature measurement instrument must meet the requirements of Table 1. Table 1 Temperature measurement only shows the accuracy of
4.1.2 Temperature measuring instruments should pay attention to the following matters when using. 10.2 When taking a small position of the medium or low position of the water drop, the wind speed passing through the ball must be kept at 3.5~100/s, preferably around 5m/s. When taking the data, the ball should be balanced. . To measure the single-ball temperature, special gauze and steamed water must be used and replaced frequently. When measuring the temperature of oxygenated water, the measuring instrument should be directly inserted into the water, or inserted into a tube filled with liquid, and the casing should be inserted into the pipeline. The liquid in the casing should be a liquid with large thermal conductivity, small heat release, and not easy to volatilize. 4.2 Micrometer
4.2.1 The accuracy of the random or compensated dynamometer for measuring air pressure should be within the range of 1% of the effective value. When the measuring force is less than 100Pa, the graduation should be Pa
4.2.2 The mercury dynamometer used to measure the water pressure drop should be able to ensure that its set value is accurate to 133P. 4.2.3 The dynamometer used to measure the water or steam pressure should ensure that the accuracy of the measured pressure is not less than 2% of the measured value. 4.2.4 The barometer used to measure the atmospheric pressure of the test environment should be able to ensure that its measured value is accurate to 1P4.3 Air pressure gauge
J/T 27—1999
The air-repellent instrument can ensure the accuracy of the measured gas quantity. 1.4 Water flow meter is the most accurate liquid flow meter. Its accuracy is not lower than the specified value. 5 Test method and requirements
5.1 Test method
5.1.1 According to the case number specified in Article 2, determine the combination of test parameters required. 5.1.2 Adjust the test equipment to make the air and water steam meet the required parameters, meet the requirements of 5.2.5.3, 5.4, and start to determine the starting time of each measurement. It should not be less than half an hour. During this period, the reading intervals should be basically equal to the average value of all readings. The test value is the average value of the test. 5.1.3 Adjust the test equipment, make sure that the air and water heat vapor parameters reach the specified combined weight as achieved in the test step 5.7.2, and the measured values obtained in 5.1.44 shall be used to calculate the heat exchange rate by two methods. One method uses the measured values of the air side to calculate the heat exchange rate, and the other method uses the measured values of the water side or the heat exchange side to calculate the heat exchange rate. The difference between the heat exchange rates calculated by the two methods shall not exceed 1%. Take the arithmetic average of the two as the heat exchange rate of the test piece. Table 2
Test parameter selection range
Cooling test
Air,
Air inlet pressure,
Air headwind 10/
Water proof; m/s
Channel pressure ka
2 Air test
1G--30
5 ~· 2G
0, 3~-7. D
Heating test
13--38
F4i-- 93
0. 15-.2.0
In the cooling test, the difference between the single reading and the average value of the air inlet temperature shall not exceed 1.5℃, and the difference between the single reading and the average value of the air inlet temperature shall not exceed 0.3℃. In the heating test, the difference between the single reading and the average value of the air inlet temperature shall not exceed 1.0℃.
5.3 Water side test requirements
Adjust the inlet temperature and water flow to the specified value. For the cooling test, the water temperature shall not deviate from the specified value by more than 1.1℃; for the heating test, the water temperature shall not deviate from the specified value by more than 0.5℃; and the maximum deviation of the ice flow from the specified value shall not exceed 1℃. 5.4 Hot steam heating test requirements
Adjust the steam pressure entering the heat exchanger to the specified value. The steam pressure shall not deviate from the specified value by more than 1.0kPa. 6 Data to be recorded
6. 1 1. Chamber performance data
h. Tester.
6.2 Heat exchanger test piece data
Manufacturer:
Model. Size←
Name:
Test non-support number, number of strokes, number of passages;
Test piece windward section;
Test piece windward number:
Campus version, general row:
First row (main row or branch row): Registered outer diameter:
Central tube outer diameter,
Tube material;
Auxiliary opening type:
Periodic tube material;
Uniform thickness of curved sheet;
Interface:
Compatible type of sheet and performance.
JG/T 21
6.3 Air balance data for water (or steam)-air heat exchanger a.
Atmospheric pressure;
Dry bulb temperature and wet temperature of air entering the test piece; Bulb temperature and apparent temperature of air leaving the test piece (only the bulb temperature needs to be recorded for hot test pieces); Bulb temperature of air in the mixing chamber and inlet chamber; Bulb temperature of air entering the test piece; Static pressure difference between the two nozzles or dynamic pressure at the nozzle outlet; Number and size of the used pressure regulators;
Heat loss coefficient of inlet air and mixing chamber;
Air pressure barrier of the test piece under working condition and wet condition. For the air pressure drop during working condition test and hot test, The test is carried out under isohumidification conditions, that is, no water passes through the test piece tube and steam is converted into steam: 1 The static pressure at the test piece inlet and the static pressure value on the leeward side of the spray nozzle or the spray nozzle, 6.4 Test data on the water side of water-to-air heat exchanger: water inlet temperature of the test piece;
Test piece outlet temperature:
Water pressure drop through the test piece under isohumidification conditions or test conditions: d
Maximum flow rate
6.5 Test data on the steam side of steam-to-air heat exchanger: a.
The steam pressure entering the test piece and the temperature when the condensing station water is opened,
The amount of condensed water:
The pressure drop through the test piece. Calculation of test results 7.1 Calculation of air flow 7.1.1 When the compressibility of air, the thermal expansion of the nozzle and the pressure drop can be ignored, the mass of air flowing through a single nozzle is calculated according to the following formula: GA,V2e,ar.r,(+a)p.= i61t.(o.622 +d)wherein: air mass fraction, kg+s-nozzle flow coefficient, nozzle flow coefficient, m: air density flowing through the nozzle, kg/m; AF,——static pressure difference before and after the nozzle, Pa, JG/T 21--1999
d.—.Air content difference at nozzle.kg/kg+→air pressure at nozzle,Pa1
Absolute air at nozzle K
7.1.2 When using multiple airflows, the total air mass flow rate is the sum of the airflow through the nozzles used. 7.1.3 The volume of air under standard conditions can be calculated as follows: 9:
Where;
.A. V2AP.wwW.bzxz.Net
The volume flow rate of air under standard conditions.m/s. 7.2 Calculation of heat lock of air
7.2.1 The air potential loss must be measured or calculated according to 3.1.1. The heat exchange capacity of the specimen shall be corrected. The ambient temperature used in the calculation shall not be less than the specified value. 7.2.2 The thermal conductivity coefficient of the air inlet chamber and the specimen can be approximately calculated by the following formula: Ku = Aud/e
Where: k—heat loss coefficient of the air inlet turbulence, kw/K: A—surface area outside the air inlet chamber, m\
Conductivity coefficient of the insulation material, kw/(·K
Thickness of the insulation material m.
Where: K.-heat loss coefficient of the limiting chamber, kW/K: A.—surface area outside the specimen, m\,
7.2.3 The thermal conductivity of the air inlet and outlet states must be adjusted according to the thermal conductivity of the air duct between the air fullness measuring point and the specimen. In order to eliminate the influence of thermal conductivity on the air inlet and outlet efficiency, the following formula is used for calculation: For the air inlet near the specimen,
=, /K(-)
- ... ——Air temperature at the mixing chamber outlet, J/k+
t..Air temperature at the mixing chamber outlet, 7.3 Calculation of heat transfer of air during cooling
7.3.1 The heat transfer of air during cooling is calculated by the following formula P=m(,)
Gadr,l
In: Hot
If there is a card, the heat transfer of air is required, kW:
Specific heat of water, [/(g,)!
JG/T 21—1999
,: The air temperature at the outlet of the test piece
The net moisture content of the air passing through the test piece, kR/ka+7.32 The heat transfer of air during cooling is calculated by the following formula @. =mGG: -?
Heat transfer of air side without dehumidification kW
Wherein: Cw.-Specific heat of air, hJ/(kg-K);
t,——·Test piece inlet is at global temperature; Test piece outlet is at global temperature
7.4 Heat transfer of air side heat exchanger during heating is calculated as follows: Wherein: Heat transfer of air side heat during heating.
.5 Water and steam The amount of condensed water should be calculated using the independent fixed timer
When the volumetric quantitative method is used,
reaches: 9--
The mass of water (or hot steam condensed water) is measured in g; a concentrated quantitative method allows the amount of water released, the number of people; 2 time, 5;
0, kg/m
V-minus the volume of water sensed by the meter, correct" 7.6 Medium heat exchange meter has
7.6.1 Cold water exchange lack of music
4, -- qC.(t t-1)
Where: \-medium (water) heat exchange; -mass flow rate of water, kg/!
C——Specific gravity of water, kJ/kg-K:
.Water outlet temperature difference.C;
.i——Water inlet temperature, T
7.6.7Heat exchange rate during heating
H.Air-water heat exchanger
b.Air-steam heat exchanger
+, =e(+: --.)
Dazhong: Shi—Steam heat exchange rate, W;
yAmount of condensed water from steam, hg/s:
I—Steam inlet value, hI/kg
Ia—Steam outlet value, kJ/kg.
7.7 Calculation of heat balance of flat channel heat exchange
. 13 )
7.7.1 The average heat of the specimen is calculated according to the following formula: @—average heat transfer.kw
JG/T 27.1999
( ,2
7.7.2 In each test, the heat transfer deviation of the air test and partial pressure side must be within the following limits [@, —P,)109
A1 additional image
G/T21:-1900
State recorder
Air trace blood flow device straight-item oh
(type as:
1.1 The nozzle device is composed of a receiving and selecting chamber, and there are two twist teeth between the two chambers. There is one or more nozzles on the partition (see Figure AI>.
Non-wind chamber
(1+5)mm
Its type
About 465%
Air type|| tt||A1.2 The center distance between the nozzles must be less than 3 times the nozzle diameter, and the center line of any nozzle must be less than 1.5 times the suction diameter + the distance between the nozzles. If the nozzle diameter is different, the height between the nozzle axis must be equal to the point.
A1. When installing the through plate in the air chamber, the distance from the nozzle end to the nozzle end must not be less than 2.5 times the throat diameter. From the nozzle outlet end to the nearest nozzle outlet end, the distance between the nozzles must not be less than 2.5 times the throat diameter. The distance from the obstruction to the object shall not be less than 5 times the diameter of the suction throat. The distance from the perforation installed in the receiving room to the upstream of the two plates shall not be less than 1.5 times the diameter of the largest throat, and the minimum distance from the receiving air intake is 0.0, where D is the cross-section of the receiving room. D.=Via-6
In the formula, the equivalent diameter of the cross-section of the receiving room m2 must be greater than the new surface size of the receiving room-m,
A1.4 When using a flow nozzle to measure the air flow test, the spray flow must be sufficient. The minimum is 15m/4, and the maximum is 35m/5.41 .5 The spray device and its compartments must be sealed. 42 Pressure measurement
Ten static ports flush with the inner wall and without thorns are evenly placed on two sections 40 mm apart before and after the spray plate, connected in parallel to form a static pressure ring, and the pressure difference is measured by a micromanometer. A3 nozzle
43.1 The structure of the nozzle must meet the requirements of Figure A2. When installed in accordance with the requirements of A1, it can be used without resistance. 43.7 The nozzle specification should meet the following requirements. The nozzle throat diameter is 1.00:1.5. The water and steam condensate quantity should be measured by independent calculation method. When the volumetric quantitative method is used, the following formula is used: 9--
The mass of water (or hot steam condensate) is measured with the amount of g; a concentrated quantitative method is used to calculate the amount of water discharged, the amount of people; 2 time, 5;
0, kg/m
V-the volume of water measured by the meter, the correct formula is "7.6 Medium heat exchange meter has
7.6.1 Cold water exchange rate
4, -- qC.(t t-1)
Where:
-Medium (water) heat exchange;
C-Water specific gravity, kJ/kg-K;
.Water outlet difference.C;
.i-Water inlet temperature, 7.6.7 Heat exchange capacity during heating H. Air-water heat exchanger b. Air-steam heat exchanger +, =e(+: --.)
Dazhong: Shi—steam heat exchange capacity, W;
y Steam condensate, hg/s:
I—steam inlet value, hI/kg
Ia—steam outlet value, kJ/kg.
7.7 Calculation of heat balance of flat channel heat exchange
. 13 )
7.7.1 The average heat of the specimen is calculated according to the following formula: @—average heat exchange capacity, kw
JG/T 27.1999
( ,2
7.7.2 In each test, the deviation of the heat exchange rate of the air measurement and partial pressure side must be within the following limits [@, —P,)109
A1 Supplementary image
G/T21:-1900
State recorder
Air trace blood device straight-item oh
(type as:
1.1 The nozzle device is composed of a receiving chamber and a selection chamber. There are two teeth between the two chambers. There is one or more nozzles on the partition (see Figure AI>.
Non-wind chamber
(1+5)mm
Its type
About 465%
Air type
One part to be inspected directly: One receiving chamber is the most vertical surface of Figure A1 Nozzle installation
A1.2 Nozzle The center distance of the same nozzle shall be less than 3 times the nozzle diameter, and the center line of any nozzle shall not be less than 1.5 times the suction diameter + 0.01mm. If the nozzle diameter is different, the minimum height between the nozzle axis must be equal to the point.
A1. When installing the through plate in the air chamber, the distance from the nozzle end to the nozzle end shall not be less than 2.5 times the throat diameter. The distance from the nozzle outlet to the nearest obstruction shall not be less than 5 times the suction throat diameter. The distance from the through hole installed in the receiving room to the upstream of the two plates shall not be less than 1.5 times the maximum throat diameter, and the minimum distance from the receiving through hole to the intake air shall not be less than 0.01mm. D is the required height of the receiving section. D.=Via-6
Where, ·-receiving chamber cross-sectional equivalent diameter m2 needs to store the receiving chamber new surface size-m,
A1.4 When using the flow nozzle to measure the air flow, the spray nozzle must be small enough to be 15m/4, and the disk must not exceed 35m/5.41.5 The spray device and its storage compartment must be sealed. 42 Pressure measurement
On the two sections with a distance of 40m before and after the spray plate, ten static ports flush with the inner wall without thorns are evenly placed on the two sections with a distance of 40m before and after the spray plate, and connected in parallel to form a static pressure ring. Use a micromanometer type instantaneous pressure gauge to measure the difference before and after. A3 nozzle
43.1 The structure of the nozzle must meet the requirements of Figure A2. When installed according to the requirements of A1, it can be used without adding resistance. 43.7 The nozzle specifications should meet the following requirements. The nozzle throat diameter is 1.00:1.5. The water and steam condensate quantity should be measured by independent calculation method. When the volumetric quantitative method is used, the following formula is used: 9--
The mass of water (or hot steam condensate) is measured with the amount of g; a concentrated quantitative method is used to calculate the amount of water discharged, the amount of people; 2 time, 5;
0, kg/m
V-the volume of water measured by the meter, the correct formula is "7.6 Medium heat exchange meter has
7.6.1 Cold water exchange rate
4, -- qC.(t t-1)
Where:
-Medium (water) heat exchange;
C-Water specific gravity, kJ/kg-K;
.Water outlet difference.C;
.i-Water inlet temperature, 7.6.7 Heat exchange capacity during heating H. Air-water heat exchanger b. Air-steam heat exchanger +, =e(+: --.)
Dazhong: Shi—steam heat exchange capacity, W;
y Steam condensate, hg/s:
I—steam inlet value, hI/kg
Ia—steam outlet value, kJ/kg.
7.7 Calculation of heat balance of flat channel heat exchange
. 13 )
7.7.1 The average heat of the specimen is calculated according to the following formula: @—average heat exchange capacity, kw
JG/T 27.1999
( ,2
7.7.2 In each test, the deviation of the heat exchange rate of the air measurement and partial pressure side must be within the following limits [@, —P,)109
A1 Supplementary image
G/T21:-1900
State recorder
Air trace blood device straight-item oh
(type as:
1.1 The nozzle device is composed of a receiving chamber and a selection chamber. There are two teeth between the two chambers. There is one or more nozzles on the partition (see Figure AI>.
Non-wind chamber
(1+5)mm
Its type
About 465%
Air type
One part to be inspected directly: One receiving chamber is the most vertical surface of Figure A1 Nozzle installation
A1.2 Nozzle The center distance of the same nozzle shall be less than 3 times the nozzle diameter, and the center line of any nozzle shall not be less than 1.5 times the suction diameter + 0.01mm. If the nozzle diameter is different, the minimum height between the nozzle axis must be equal to the point.
A1. When installing the through plate in the air chamber, the distance from the nozzle end to the nozzle end shall not be less than 2.5 times the throat diameter. The distance from the nozzle outlet to the nearest obstruction shall not be less than 5 times the suction throat diameter. The distance from the through hole installed in the receiving room to the upstream of the two plates shall not be less than 1.5 times the maximum throat diameter, and the minimum distance from the receiving through hole to the intake air shall not be less than 0.01mm. D is the required height of the receiving section. D.=Via-6
Where, ·-receiving chamber cross-sectional equivalent diameter m2 needs to store the receiving chamber new surface size-m,
A1.4 When using the flow nozzle to measure the air flow, the spray nozzle must be small enough to be 15m/4, and the disk must not exceed 35m/5.41.5 The spray device and its storage compartment must be sealed. 42 Pressure measurement
On the two sections with a distance of 40m before and after the spray plate, ten static ports flush with the inner wall without thorns are evenly placed on the two sections with a distance of 40m before and after the spray plate, and connected in parallel to form a static pressure ring. Use a micromanometer type instantaneous pressure gauge to measure the difference before and after. A3 nozzle
43.1 The structure of the nozzle must meet the requirements of Figure A2. When installed according to the requirements of A1, it can be used without adding resistance. 43.7 The nozzle specifications should meet the following requirements. The nozzle throat diameter is 1.00:1.
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