Some standard content:
Mechanical Industry Standard of the People's Republic of China
Air heater
1 Subject content and applicable examples
JB/T 7225-94
This standard specifies the types and basic parameters, technical requirements, test methods, inspection rules, marking, packaging and storage of air heaters. This standard applies to air heaters equipped with axial flow fans or centrifugal fans, and the coil heat medium is hot water or steam. This standard does not apply to heating equipment using gas or electricity as a heat source, nor to air heating equipment using a duct system for heating. Reference standards
GB985Basic types and dimensions of weld grooves for gas welding, manual arc welding and gas shielded weldingGB9068Engineering method for determination of sound power level of noise for heating, ventilation and air conditioning equipment
GB10080Ventilators for air conditioning
Safety requirements
GB 10891
Air handling unit
GB/T13306Signage
3Fan coil unit
JB/T4283
JB4292Technical conditions for coils
JB/T4302
ZB J72 009
ZB J72 017
ZB J72 021
ZB J72 026
ZB J72 029
3 Type
Heating and ventilation equipment
Safety requirements
Model compilation method
Air heating coil performance test method
Coating technical conditions for heating, ventilation and air conditioning equipment Coil pressure test and sealing inspection
General technical conditions for packaging of heating and ventilation equipment Appearance quality and cleanliness of heating and ventilation equipment 3.1 The model code of the heater shall comply with the provisions of Table 1. Table 1
Fan type
Heat medium type
Axial flow type
Centrifugal type
3.2 The model compilation of the heater shall comply with the provisions of JB/T4302. 4 Basic parameters
4.1 The rated voltage of the AC power supply is 220V single-phase or 380V three-phase, and the frequency is 50Hz. 4.2 The basic parameters of the heater shall not be lower than those specified in Table 2. Approved by the Ministry of Machinery Industry of the People's Republic of China on July 18, 1994, 742
Implementation from July to January 1995
Rated air volume
20 000
JB/T 7225—94
Rated heating supply, kwbzxZ.net
4.3 The rated air volume and rated input power of the heater shall be determined according to the working conditions specified in Table 3. Table 3
Inlet air dry-bulb temperature, ℃
Heating conditions
Fan speed
Inlet and outlet air static pressure difference+Pa
The rated heating parameters of the fan heater are determined according to the working conditions specified in Table 4. Table 4
Inlet air dry-bulb temperature, C
Inlet water/return water/water temperature, C
Inlet steam pressure, MPa
Fan speed
Inlet and outlet air static pressure difference, Pa
Working conditions parameters
10～30
No heating
Rated maximum speed
Working conditions parameters
Rated maximum speed
5 Technical conditions
…General requirements
JB/T 7225—94
The fan heater should comply with the provisions of this standard. And manufactured according to the drawings and technical documents approved by the prescribed procedures. 5.2 Performance requirements of air heaters
The measured air volume of the air heater should not be less than 90% of the rated air volume. 5.2.2
The measured heat supply of the air heater should not be less than 90% of the rated heat supply. The outlet temperature of the air heater should not be lower than 35℃. 5.2.3
The vibration speed of the air heater should not exceed 6.3mm/s. 5.2.5
The noise limit of the air heater should comply with the provisions of Table 5. Table 5
Rated air volume, m2/h
>3150~8000
>8 000-~20 000
≥>20 000~50 000
5.3 Requirements for main parts and components
Axial flow
Noise (sound pressure level), dB(A)
Standard parts, outsourced parts and purchased parts shall comply with the provisions of relevant standards and be accompanied by product certificates. 5.3.2
The coils used for the heater shall comply with the provisions of JB4292. 5.3.3
The fan impeller used for the heater shall be manufactured in accordance with the provisions of relevant standards. Requirements for the heater casing
Centrifugal
5.3.4.1 The flange size of the assembled coil shall be consistent with the flange size of the matching coil, and the tolerance shall comply with the provisions of JB4292. 5.3.4.2
The flatness tolerance of the flange surface shall not exceed 2.5/1000. 5.3.4.3 The flatness tolerance of the two side plates supporting the impeller drive shaft of the centrifugal heater shall not exceed 5/1000. 5.4 Requirements for welding of heaters
The type and size of general welding joints shall comply with the provisions of GB985. 5.4.2 The welded joint shall be firm and reliable, and shall not have defects such as cracks, slag inclusions, pores and incomplete penetration that affect strength. The weld shall smoothly transition to the parent material.
5.5 Requirements for assembly of heaters
After assembly, the impeller, pulley and other parts shall rotate flexibly and without obstruction. 5.6 Safety requirements
The fan inlet of the centrifugal heater should be equipped with a protective cover. The insulation resistance and leakage current of the heater should comply with the provisions of Chapter 8 and Chapter 10 of GB10891. 5.7 The painting, appearance quality and cleanliness of the heater should comply with the provisions of ZBJ72017 and ZBJ72029 respectively. 5.8 Warranty period
The user shall comply with the product manual and various regulations. Within 18 months from the date of shipment from the manufacturer, the actual use time shall not exceed 8000h. If the product is damaged or cannot work normally due to poor manufacturing, the manufacturer shall repair or replace it free of charge (excluding wearing parts). 6 Test method
6.1 Test conditions
6.1.1 The thermal performance test device of the heater is shown in Appendix A (supplement). 714
6.1.2 The test conditions shall be in accordance with the provisions of Table 6.
Air volume test
Heating test
Inlet air dry bulb temperature
JB/T 7225—94
Operating parameters
Water supply inlet temperature
Air supply inlet pressure
Fan speed
Rated maximum speed
Inlet and outlet air static pressure difference
6.1.3 All kinds of instruments and meters used in the test shall be accompanied by a metrological verification certificate within the effective use period, and their minimum scale value and accuracy shall comply with the provisions of the table. When a rod-type glass mercury thermometer is used to measure the temperature of the heat medium, a protective cover shall be added. Table 7
Measurement items
Air inlet and outlet temperature
Hot water inlet and outlet temperature
Steam temperature
Condensate temperature
Hot water flow
Weight of sampled water or condensate
Wind speed at air outlet
Steam inlet pressure
Pressure loss
Atmospheric pressure
Ambient temperature
Relative humidity
6.2 Test contents
6.2.1 Thermal performance test
Instrument name
Rod-type glass mercury thermometer|| tt||Thermocouple (resistance) thermometer
Rod-type glass mercury overflow meter
Orifice plate, turbine flowmeter, etc.
Weight meter
Water meter
Hot-bulb anemometer
Lergometer
U-type differential pressure gauge
Mercury liquid column barometer
Volume meter
Rod-type glass mercury thermometer
Dry and wet bulb thermometer
Tachometer
Sound level meter
Power meter
Vibration meter
Test according to the method specified in Appendix A and the working conditions specified in Table 6. 6.2.2 Noise test
According to the relevant provisions of GB9068.
6.2.3 Input power and current test
Minimum scale
<2% of the range
0.5% of the measured value
1% of the instrument range
While carrying out the test in 6.2.1, measure the input power and current value of the motor used by the heater. 6.2.4 Water resistance test of heater
2% of the range
According to the relevant provisions of ZBJ72009.
6.2.5 Start-up and operation test
According to the relevant provisions of JB4283.
6.2.6 Appearance inspection
According to the relevant provisions of ZBJ72029.
6.2.7 Leakage test
According to the relevant provisions of ZBI72021.
6.2.8 Vibration test
According to the relevant provisions of GB10080.
Inspection rules
JB/T 7225—94
7.1 The heater should be inspected and qualified by the quality inspection department and can be shipped with the product certificate. Various types of inspections of heaters shall be in accordance with the provisions of Table 8. Table 8
Inspection items
Heating
Input power and current
Water resistance
Insulation resistance
Leakage current
Starting, operation
7.2 Type inspection
Inspection category
7.2.1 When trial-producing new products, transferring old products to other factories, and re-starting production of products that have been discontinued for more than three years, type inspection should be carried out. 7.2.2 When changes in important raw materials, design, and process structure may affect product performance, type inspection should be carried out. 7.3 Sampling inspection shall be in accordance with the provisions of Table 9.
100500
8 Marking, packaging and storage
8.1 Marking
Sample size
Qualified judgment number A.
Number of unqualified judgment R,
8.1.1 Each fan heater shall be fixed with a label in an obvious position. The type, size and technical requirements of the label shall comply with the regulations of GB/T13306. The label shall indicate the following contents:
Manufacturer name;
b. Product model and name;
JB/T7225
Main technical characteristics: air volume, m/h; heating capacity, kW: water supply temperature, C (or steam pressure, MPa); speed, x/min; motor input power, kW; voltage, V; frequency, Hz; weight, kg, d.
Manufacturing date;
Product factory number.
8.1.2 The fan heater shall have the following signs to indicate the working conditions: a
Direction of rotation of the fan impeller;
Direction of water (gas) inlet and outlet.
8.1.3 The heater should be marked with a registered trademark.
8.2 Packaging
8.2.1 The packaging of the heater should comply with the provisions of ZBJ72026. 8.2.2
The following technical documents should be included in the packaging box: a.
Material;
Product certificate:
Product manual, including: product structure and installation diagram, installation instructions and requirements, usage methods, maintenance and care notes packing list.
8.3 Storage
8.3.1 The heater should be stored in a ventilated and dry warehouse or shed, and the product should be protected from bumps and corrosive gases. 8.3.2 The storage period is one year, and it should be inspected in time if it exceeds one year. 747
Test device
JB/T 7225—94
Appendix A
Thermal performance test of air heater
(Supplement)
The test device is divided into two types: hot water heating system and steam heating system. A1.1 Test device for hot water heating system
The test device is shown in Figure A1. The flow rate of the heating system should be adjustable and ensure continuous water supply. A7.1.1 Hot water pipeline system
High-level water sugar
Secondary heating device
Thermometer
+++.++++.++
Connect pressure gauge
Warm fan
Connect pressure gauge
Flow meter
Thermometer
Cooler
Regulating valve
A1.1.1.1 There should be an air discharge device above the water inlet pipeline, and it should be ensured that the heating system is not mixed with air during the test. A1.7.1.2 The flow measurement section pipeline should be a straight pipe section with the smallest change in hot water flow. The pipe diameter should be the same as the pipe diameter, and its front and rear length should meet the installation requirements of the relevant flow meter.
{B/T7225—94
A1.1.1.3The distance between the measuring position of the hot water inlet and outlet temperature and the hot water inlet and outlet pipes of the heater is less than or equal to 300mm, and the thermometer heat-sensing element should pass through the pipeline axis. When using a mercury thermometer for measurement, the thermometer should be inserted into a protective sleeve filled with oil, and the insertion type of the protective sleeve is shown in Figure A2.
Water flow direction
Vertical pipe
bHorizontal pipe
Water flow direction
℃Right-angle elbow
A1.1.1.4The amount of hot water in the heater is measured by weight or volume. The water meter used should meet the requirements of Table 7. The dead weight of the collection container should not exceed 50% of the normal capacity weight, and the return water should be below 50℃ after passing through the cooling device. Orifice plates, turbine flow meters or float flow meters can be attached to the pipeline to observe the stability of the water volume. A1.1.1.5 Use 50mm thick styrene tiles, slag wool felt or other equivalent materials to insulate the hot water inlet and outlet of the secondary heater and flow meter.
A1.1.1.6 There should be enough height difference between the high-level water tank and the water inlet of the heater to overcome the water resistance of the test system. A1.2 Steam heating system test device
The configuration of the test device and measuring instruments is shown in Figure A3. A1.2.1 Steam source and pipeline
The steam system should have sufficient gas supply, convenient pressure regulation, and be equipped with an overheating device. The pipeline design should be as short as possible, and the diameter of the measuring section should be the same as the diameter of the heater pipe.
A1.2.2 Gas-water separator and throttle valve
The gas-water separator and throttle valve are installed on the air inlet pipe of the heater. The gas-water separator should be set so that the intake air does not contain condensed water, and the distance between it and the steam inlet of the heater should not exceed 600mm. The throttle valve should be able to be adjusted in small amounts. A1.2.3 Measurement of steam pressure and steam temperature The pressure gauge and thermometer for measuring the steam state at the heater inlet should be installed behind the throttle valve. The distance between the measuring position and the heater inlet should not exceed 300mm, and the heat-sensitive part of the thermometer should touch the main steam flow. 749
Connect to steam system.
JB/T 7225—-94
Automobile separator
Drain pipe
Thermometer
Superheater
Purifier
A1.2.4 Condensate delivery and outlet regulating valve pressure gauge
Heater
Thermometer
Exhaust port
Surface gauge
Thermometer
The condensate delivery pipe should be equipped with a glass liquid level gauge, and the length of the delivery pipe should not exceed 1000mm. The outlet regulating valve should be capable of micro-adjustment. A1.2.5 Condensate measurement
Condensate is measured by weight or volumetric method, and its minimum scale and accuracy should comply with the provisions of Table 7. The condensate deviation (converted to the same time value) of each cycle (referring to the time recorded from 16 measurements) should be within ± 2% of its average value. The temperature of the condensate flowing into the collection container should be kept below 50C.
A1.2.6 Insulation
The air-water separator, condensate delivery pipe and the steam inlet and outlet of the heater should be insulated with polystyrene tiles, slag wool felt or other equivalent materials with a thickness of about 50mm
A1.3 Air duct system of heater
A1.3.1 There is no pipeline at the air inlet of the heater, and a short pipe with the same cross-sectional size as the outlet of the heater and a length equal to one equivalent diameter is installed at the air outlet to measure the average wind speed and outlet temperature of the outlet cross-sectional area of the heater. The outside of the short pipe should be insulated. A1.3.2 Inlet air temperature measurement
Place the thermometer in front of the heater inlet to measure the inlet air temperature. There should be no less than three measuring points and the arithmetic mean is taken. A1.3.3 Outlet air temperature measurement
Place the thermocouple thermometer at a distance of 2/3 of the equivalent diameter of the heater outlet to measure. The temperature detection should be evenly distributed throughout the outlet. There should be more than nine measuring points and the arithmetic mean is taken.
A1.3.4 Outlet wind speed measurement2 When changes in important raw materials, design, and process structure may affect product performance, type inspection should be carried out. 7.3 Sampling inspection shall be in accordance with the provisions of Table 9.
100500
8 Marking, packaging and storage
8.1 Marking
Sample size
Qualified judgment number A.
Unqualified judgment number R,
8.1.1 Each heater should be fixed with a label in a conspicuous position. The type, size and technical requirements of the label should comply with the regulations of GB/T13306. The label should indicate the following contents:
Manufacturer name;
b. Product model and name;
JB/T7225
Main technical characteristics: air volume, m/h; heating supply, kW: water supply temperature, C (or steam pressure, MPa); speed, x/min; motor input power, kW; voltage, V; frequency, Hz; weight, kg, d.
Date of manufacture;
Product factory number.
8.1.2 The heater should have the following signs to indicate the working conditions: a
Direction of rotation of the fan impeller;
Direction of water (gas) inlet and outlet.
8.1.3 The heater should be marked with a registered trademark.
8.2 Packaging
8.2.1 The packaging of the heater should comply with the provisions of ZBJ72026. 8.2.2
The following technical documents should be included in the packing box: a.
Material;
Product certificate:
Product manual, including: product structure and installation diagram, installation instructions and requirements, usage methods, maintenance and care notes packing list.
8.3 Storage
8.3.1 The heater should be stored in a ventilated and dry warehouse or shed, and prevent the product from being knocked and corrosive gas 8.3.2 The storage period is one year, and it should be inspected in time if it exceeds one year. 747
Test device
JB/T 7225—94
Appendix A
Thermal performance test of heater
(Supplement)
The test device is divided into two types: hot water heating system and steam heating system. A1.1 Test device for hot water heating system
The test device is shown in Figure A1. The flow of the heating system should be adjustable and ensure continuous water supply. First filter
A7.1.1 Hot water pipeline system
High water sugar
Second heating device
Thermometer
+++.++++.++
Connect pressure gauge
Warm fan
Connect pressure gauge
Flow meter
Thermometer
Cooler
Regulating valve
A1.1.1.1 There should be an air discharge device above the water inlet pipeline to ensure that the heating system is not mixed with air during the test. A1.7.1.2 The flow measurement section pipeline should be a straight pipe section with the smallest change in hot water flow. The pipe diameter should be the same as the pipe diameter, and its front and rear length should meet the installation requirements of the relevant flow meter.
{B/T7225—94
A1.1.1.3The distance between the measuring position of the hot water inlet and outlet temperature and the hot water inlet and outlet pipes of the heater is less than or equal to 300mm, and the thermometer heat-sensing element should pass through the pipeline axis. When using a mercury thermometer for measurement, the thermometer should be inserted into a protective sleeve filled with oil, and the insertion type of the protective sleeve is shown in Figure A2.
Water flow direction
Vertical pipe
bHorizontal pipe
Water flow direction
℃Right-angle elbow
A1.1.1.4The amount of hot water in the heater is measured by weight or volume. The water meter used should meet the requirements of Table 7. The dead weight of the collection container should not exceed 50% of the normal capacity weight, and the return water should be below 50℃ after passing through the cooling device. Orifice plates, turbine flow meters or float flow meters can be attached to the pipeline to observe the stability of the water volume. A1.1.1.5 Use 50mm thick styrene tiles, slag wool felt or other equivalent materials to insulate the hot water inlet and outlet of the secondary heater and flow meter.
A1.1.1.6 There should be enough height difference between the high-level water tank and the water inlet of the heater to overcome the water resistance of the test system. A1.2 Steam heating system test device
The configuration of the test device and measuring instruments is shown in Figure A3. A1.2.1 Steam source and pipeline
The steam system should have sufficient gas supply, convenient pressure regulation, and be equipped with an overheating device. The pipeline design should be as short as possible, and the diameter of the measuring section should be the same as the diameter of the heater pipe.
A1.2.2 Gas-water separator and throttle valve
The gas-water separator and throttle valve are installed on the air inlet pipe of the heater. The gas-water separator should be set so that the intake air does not contain condensed water, and the distance between it and the steam inlet of the heater should not exceed 600mm. The throttle valve should be able to be adjusted in small amounts. A1.2.3 Measurement of steam pressure and steam temperature The pressure gauge and thermometer for measuring the steam state at the heater inlet should be installed behind the throttle valve. The distance between the measuring position and the heater inlet should not exceed 300mm, and the heat-sensitive part of the thermometer should touch the main steam flow. 749
Connect to steam system.
JB/T 7225—-94
Automobile separator
Drain pipe
Thermometer
Superheater
Purifier
A1.2.4 Condensate delivery and outlet regulating valve pressure gauge
Heater
Thermometer
Exhaust port
Surface gauge
Thermometer
The condensate delivery pipe should be equipped with a glass liquid level gauge, and the length of the delivery pipe should not exceed 1000mm. The outlet regulating valve should be capable of micro-adjustment. A1.2.5 Condensate measurement
Condensate is measured by weight or volumetric method, and its minimum scale and accuracy should comply with the provisions of Table 7. The condensate deviation (converted to the same time value) of each cycle (referring to the time recorded from 16 measurements) should be within ± 2% of its average value. The temperature of the condensate flowing into the collection container should be kept below 50C.
A1.2.6 Insulation
The air-water separator, condensate delivery pipe and the steam inlet and outlet of the heater should be insulated with polystyrene tiles, slag wool felt or other equivalent materials with a thickness of about 50mm
A1.3 Air duct system of heater
A1.3.1 There is no pipeline at the air inlet of the heater, and a short pipe with the same cross-sectional size as the outlet of the heater and a length equal to one equivalent diameter is installed at the air outlet to measure the average wind speed and outlet temperature of the outlet cross-sectional area of the heater. The outside of the short pipe should be insulated. A1.3.2 Inlet air temperature measurement
Place the thermometer in front of the heater inlet to measure the inlet air temperature. There should be no less than three measuring points and the arithmetic mean is taken. A1.3.3 Outlet air temperature measurement
Place the thermocouple thermometer at a distance of 2/3 of the equivalent diameter of the heater outlet to measure. The temperature detection should be evenly distributed throughout the outlet. There should be more than nine measuring points and the arithmetic mean is taken.
A1.3.4 Outlet wind speed measurement2 When changes in important raw materials, design, and process structure may affect product performance, type inspection should be carried out. 7.3 Sampling inspection shall be in accordance with the provisions of Table 9.
100500
8 Marking, packaging and storage
8.1 Marking
Sample size
Qualified judgment number A.
Unqualified judgment number R,
8.1.1 Each heater should be fixed with a label in a conspicuous position. The type, size and technical requirements of the label should comply with the regulations of GB/T13306. The label should indicate the following contents:
Manufacturer name;
b. Product model and name;
JB/T7225
Main technical characteristics: air volume, m/h; heating supply, kW: water supply temperature, C (or steam pressure, MPa); speed, x/min; motor input power, kW; voltage, V; frequency, Hz; weight, kg, d.
Date of manufacture;
Product factory number.
8.1.2 The heater should have the following signs to indicate the working conditions: a
Direction of rotation of the fan impeller;
Direction of water (gas) inlet and outlet.
8.1.3 The heater should be marked with a registered trademark.
8.2 Packaging
8.2.1 The packaging of the heater should comply with the provisions of ZBJ72026. 8.2.2
The following technical documents should be included in the packing box: a.
Material;
Product certificate:
Product manual, including: product structure and installation diagram, installation instructions and requirements, usage methods, maintenance and care notes packing list.
8.3 Storage
8.3.1 The heater should be stored in a ventilated and dry warehouse or shed, and prevent the product from being knocked and corrosive gas 8.3.2 The storage period is one year, and it should be inspected in time if it exceeds one year. 747
Test device
JB/T 7225—94
Appendix A
Thermal performance test of heater
(Supplement)
The test device is divided into two types: hot water heating system and steam heating system. A1.1 Test device for hot water heating system
The test device is shown in Figure A1. The flow of the heating system should be adjustable and ensure continuous water supply. First filter
A7.1.1 Hot water pipeline system
High water sugar
Second heating device
Thermometer
+++.++++.++
Connect pressure gauge
Warm fan
Connect pressure gauge
Flow meter
Thermometer
Cooler
Regulating valve
A1.1.1.1 There should be an air discharge device above the water inlet pipeline to ensure that the heating system is not mixed with air during the test. A1.7.1.2 The flow measurement section pipeline should be a straight pipe section with the smallest change in hot water flow. The pipe diameter should be the same as the pipe diameter, and its front and rear length should meet the installation requirements of the relevant flow meter.
{B/T7225—94
A1.1.1.3The distance between the measuring position of the hot water inlet and outlet temperature and the hot water inlet and outlet pipes of the heater is less than or equal to 300mm, and the thermometer heat-sensing element should pass through the pipeline axis. When using a mercury thermometer for measurement, the thermometer should be inserted into a protective sleeve filled with oil, and the insertion type of the protective sleeve is shown in Figure A2.
Water flow direction
Vertical pipe
bHorizontal pipe
Water flow direction
℃Right-angle elbow
A1.1.1.4The amount of hot water in the heater is measured by weight or volume. The water meter used should meet the requirements of Table 7. The dead weight of the collection container should not exceed 50% of the normal capacity weight, and the return water should be below 50℃ after passing through the cooling device. Orifice plates, turbine flow meters or float flow meters can be attached to the pipeline to observe the stability of the water volume. A1.1.1.5 Use 50mm thick styrene tiles, slag wool felt or other equivalent materials to insulate the hot water inlet and outlet of the secondary heater and flow meter.
A1.1.1.6 There should be enough height difference between the high-level water tank and the water inlet of the heater to overcome the water resistance of the test system. A1.2 Steam heating system test device
The configuration of the test device and measuring instruments is shown in Figure A3. A1.2.1 Steam source and pipeline
The steam system should have sufficient gas supply, convenient pressure regulation, and be equipped with an overheating device. The pipeline design should be as short as possible, and the diameter of the measuring section should be the same as the diameter of the heater pipe.
A1.2.2 Gas-water separator and throttle valve
The gas-water separator and throttle valve are installed on the air inlet pipe of the heater. The gas-water separator should be set so that the intake air does not contain condensed water, and the distance between it and the steam inlet of the heater should not exceed 600mm. The throttle valve should be able to be adjusted in small amounts. A1.2.3 Measurement of steam pressure and steam temperature The pressure gauge and thermometer for measuring the steam state at the heater inlet should be installed behind the throttle valve. The distance between the measuring position and the heater inlet should not exceed 300mm, and the heat-sensitive part of the thermometer should touch the main steam flow. 749
Connect to steam system.
JB/T 7225—-94
Automobile separator
Drain pipe
Thermometer
Superheater
Purifier
A1.2.4 Condensate delivery and outlet regulating valve pressure gauge
Heater
Thermometer
Exhaust port
Surface gauge
Thermometer
The condensate delivery pipe should be equipped with a glass liquid level gauge, and the length of the delivery pipe should not exceed 1000mm. The outlet regulating valve should be capable of micro-adjustment. A1.2.5 Condensate measurement
Condensate is measured by weight or volumetric method, and its minimum scale and accuracy should comply with the provisions of Table 7. The condensate deviation (converted to the same time value) of each cycle (referring to the time recorded from 16 measurements) should be within ± 2% of its average value. The temperature of the condensate flowing into the collection container should be kept below 50C.
A1.2.6 Insulation
The air-water separator, condensate delivery pipe and the steam inlet and outlet of the heater should be insulated with polystyrene tiles, slag wool felt or other equivalent materials with a thickness of about 50mm
A1.3 Air duct system of heater
A1.3.1 There is no pipeline at the air inlet of the heater, and a short pipe with the same cross-sectional size as the outlet of the heater and a length equal to one equivalent diameter is installed at the outlet to measure the average wind speed and outlet temperature of the outlet cross-sectional area of the heater. The outside of the short pipe should be insulated. A1.3.2 Inlet air temperature measurement
Place the thermometer in front of the heater inlet to measure the inlet air temperature. There should be no less than three measuring points and the arithmetic mean is taken. A1.3.3 Outlet air temperature measurement
Place the thermocouple thermometer at a distance of 2/3 of the equivalent diameter of the heater outlet to measure. The temperature detection should be evenly distributed throughout the outlet. There should be more than nine measuring points and the arithmetic mean is taken.
A1.3.4 Outlet wind speed measurement2 The storage period is one year. If it exceeds one year, it should be checked in time. 747
Test device
JB/T 7225—94
Appendix A
Thermal performance test of heater
(Supplement)
The test device is divided into two types: hot water heating system and steam heating system. A1.1 Hot water heating system test device
The test device is shown in Figure A1. The flow of the heating system should be adjustable and ensure continuous water supply. A7.1.1 Hot water pipeline system
High-level water sugar
Secondary heating device
Thermometer
+++.++++.++
Connect pressure gauge
Warm fan
Connect pressure gauge
Flow meter
Thermometer
Cooler
Regulating valve
A1.1.1.1 There should be an air discharge device above the water inlet pipeline, and it should be ensured that the heating system is not mixed with air during the test. A1.7.1.2 The flow measurement section pipeline should be a straight pipe section with the smallest change in hot water flow. The pipe diameter should be the same as the pipe diameter, and its front and rear length should meet the installation requirements of the relevant flow meter.
{B/T7225—94
A1.1.1.3The distance between the measuring position of the hot water inlet and outlet temperature and the hot water inlet and outlet pipes of the heater is less than or equal to 300mm, and the thermometer heat-sensing element should pass through the pipeline axis. When using a mercury thermometer for measurement, the thermometer should be inserted into a protective sleeve filled with oil, and the insertion type of the protective sleeve is shown in Figure A2.
Water flow direction
Vertical pipe
bHorizontal pipe
Water flow direction
℃Right-angle elbow
A1.1.1.4The amount of hot water in the heater is measured by weight or volume. The water meter used should meet the requirements of Table 7. The dead weight of the collection container should not exceed 50% of the normal capacity weight, and the return water should be below 50℃ after passing through the cooling device. Orifice plates, turbine flow meters or float flow meters can be attached to the pipeline to observe the stability of the water volume. A1.1.1.5 Use 50mm thick styrene tiles, slag wool felt or other equivalent materials to insulate the hot water inlet and outlet of the secondary heater and flow meter.
A1.1.1.6 There should be enough height difference between the high-level water tank and the water inlet of the heater to overcome the water resistance of the test system. A1.2 Steam heating system test device
The configuration of the test device and measuring instruments is shown in Figure A3. A1.2.1 Steam source and pipeline
The steam system should have sufficient gas supply, convenient pressure regulation, and be equipped with an overheating device. The pipeline design should be as short as possible, and the diameter of the measuring section should be the same as the diameter of the heater pipe.
A1.2.2 Gas-water separator and throttle valve
The gas-water separator and throttle valve are installed on the air inlet pipe of the heater. The gas-water separator should be set so that the intake air does not contain condensed water, and the distance between it and the steam inlet of the heater should not exceed 600mm. The throttle valve should be able to be adjusted in small amounts. A1.2.3 Measurement of steam pressure and steam temperature The pressure gauge and thermometer for measuring the steam state at the heater inlet should be installed behind the throttle valve. The distance between the measuring position and the heater inlet should not exceed 300mm, and the heat-sensitive part of the thermometer should touch the main steam flow. 749
Connect to steam system.
JB/T 7225—-94
Automobile separator
Drain pipe
Thermometer
Superheater
Purifier
A1.2.4 Condensate delivery and outlet regulating valve pressure gauge
Heater
Thermometer
Exhaust port
Surface gauge
Thermometer
The condensate delivery pipe should be equipped with a glass liquid level gauge, and the length of the delivery pipe should not exceed 1000mm. The outlet regulating valve should be capable of micro-adjustment. A1.2.5 Condensate measurement
Condensate is measured by weight or volumetric method, and its minimum scale and accuracy should comply with the provisions of Table 7. The condensate deviation (converted to the same time value) of each cycle (referring to the time recorded from 16 measurements) should be within ± 2% of its average value. The temperature of the condensate flowing into the collection container should be kept below 50C.
A1.2.6 Insulation
The air-water separator, condensate delivery pipe and the steam inlet and outlet of the heater should be insulated with polystyrene tiles, slag wool felt or other equivalent materials with a thickness of about 50mm
A1.3 Air duct system of heater
A1.3.1 There is no pipeline at the air inlet of the heater, and a short pipe with the same cross-sectional size as the outlet of the heater and a length equal to one equivalent diameter is installed at the air outlet to measure the average wind speed and outlet temperature of the outlet cross-sectional area of the heater. The outside of the short pipe should be insulated. A1.3.2 Inlet air temperature measurement
Place the thermometer in front of the heater inlet to measure the inlet air temperature. There should be no less than three measuring points and the arithmetic mean is taken. A1.3.3 Outlet air temperature measurement
Place the thermocouple thermometer at a distance of 2/3 of the equivalent diameter of the heater outlet. The temperature detection should be evenly distributed throughout the outlet. There should be more than nine measuring points and the arithmetic mean is taken.
A1.3.4 Outlet wind speed measurement2 The storage period is one year. If it exceeds one year, it should be checked in time. 747
Test device
JB/T 7225—94
Appendix A
Thermal performance test of air heater
(Supplement)
The test device is divided into two types: hot water heating system and steam heating system. A1.1 Hot water heating system test device
The test device is shown in Figure A1. The flow of the heating system should be adjustable and ensure continuous water supply. A7.1.1 Hot water pipeline system
High-level water sugar
Secondary heating device
Thermometer
+++.++++.++
Connect pressure gauge
Warm fan
Connect pressure gauge
Flow meter
Thermometer
Cooler
Regulating valve
A1.1.1.1 There should be an air discharge device above the water inlet pipeline. During the test, it should be ensured that the heating system is not mixed with air. A1.7.1.2 The flow measurement section pipeline should be a straight pipe section with the smallest change in hot water flow. The pipe diameter should be the same as the pipe diameter, and its front and rear length should meet the installation requirements of the relevant flow meter.
{B/T7225—94
A1.1.1.3The distance between the measuring position of the hot water inlet and outlet temperature and the hot water inlet and outlet pipes of the heater is less than or equal to 300mm, and the thermometer heat-sensing element should pass through the pipeline axis. When using a mercury thermometer for measurement, the thermometer should be inserted into a protective sleeve filled with oil, and the insertion type of the protective sleeve is shown in Figure A2.
Water flow direction
Vertical pipe
bHorizontal pipe
Water flow direction
℃Right-angle elbow
A1.1.1.4The amount of hot water in the heater is measured by weight or volume. The water meter used should meet the requirements of Table 7. The dead weight of the collection container should not exceed 50% of the normal capacity weight, and the return water should be below 50℃ after passing through the cooling device. Orifice plates, turbine flow meters or float flow meters can be attached to the pipeline to observe the stability of the water volume. A1.1.1.5 Use 50mm thick styrene tiles, slag wool felt or other equivalent materials to insulate the hot water inlet and outlet of the secondary heater and flow meter.
A1.1.1.6 There should be enough height difference between the high-level water tank and the water inlet of the heater to overcome the water resistance of the test system. A1.2 Steam heating system test device
The configuration of the test device and measuring instruments is shown in Figure A3. A1.2.1 Steam source and pipeline
The steam system should have sufficient gas supply, convenient pressure regulation, and be equipped with an overheating device. The pipeline design should be as short as possible, and the diameter of the measuring section should be the same as the diameter of the heater pipe.
A1.2.2 Gas-water separator and throttle valve
The gas-water separator and throttle valve are installed on the air inlet pipe of the heater. The gas-water separator should be set so that the intake air does not contain condensed water, and the distance between it and the steam inlet of the heater should not exceed 600mm. The throttle valve should be able to be adjusted in small amounts. A1.2.3 Measurement of steam pressure and steam temperature The pressure gauge and thermometer for measuring the steam state at the heater inlet should be installed behind the throttle valve. The distance between the measuring position and the heater inlet should not exceed 300mm, and the heat-sensitive part of the thermometer should touch the main steam flow. 749
Connect to steam system.
JB/T 7225—-94
Automobile separator
Drain pipe
Thermometer
Superheater
Purifier
A1.2.4 Condensate delivery and outlet regulating valve pressure gauge
Heater
Thermometer
Exhaust port
Surface gauge
Thermometer
The condensate delivery pipe should be equipped with a glass liquid level gauge, and the length of the delivery pipe should not exceed 1000mm. The outlet regulating valve should be capable of micro-adjustment. A1.2.5 Condensate measurement
Condensate is measured by weight or volumetric method, and its minimum scale and accuracy should comply with the provisions of Table 7. The condensate deviation (converted to the same time value) of each cycle (referring to the time recorded from 16 measurements) should be within ± 2% of its average value. The temperature of the condensate flowing into the collection container should be kept below 50C.
A1.2.6 Insulation
The air-water separator, condensate delivery pipe and the steam inlet and outlet of the heater should be insulated with polystyrene tiles, slag wool felt or other equivalent materials with a thickness of about 50mm
A1.3 Air duct system of heater
A1.3.1 There is no pipeline at the air inlet of the heater, and a short pipe with the same cross-sectional size as the outlet of the heater and a length equal to one equivalent diameter is installed at the air outlet to measure the average wind speed and outlet temperature of the outlet cross-sectional area of the heater. The outside of the short pipe should be insulated. A1.3.2 Inlet air temperature measurement
Place the thermometer in front of the heater inlet to measure the inlet air temperature. There should be no less than three measuring points and the arithmetic mean is taken. A1.3.3 Outlet air temperature measurement
Place the thermocouple thermometer at a distance of 2/3 of the equivalent diameter of the heater outlet to measure. The temperature detection should be evenly distributed throughout the outlet. There should be more than nine measuring points and the arithmetic mean is taken.
A1.3.4 Outlet wind speed measurement4 Condensate delivery and outlet regulating valve pressure gauge
heater
thermometer
exhaust port
surface gauge
thermometer
The condensate delivery pipe should be equipped with a glass liquid level gauge, and the length of the delivery pipe should not exceed 1000mm. The outlet regulating valve should be able to be adjusted slightly. A1.2.5 Condensate measurement
Condensate is measured by weight or volume, and its minimum division and accuracy should comply with the provisions of Table 7. The condensate deviation (converted to the same time value) of each cycle (referring to the time recorded from 16 measurements) should be within the average value ± 2%. The temperature of the condensate flowing into the collection container should be kept below 50C.
A1.2.6 Insulation
The air-water separator, condensate delivery pipe and the steam inlet and outlet of the heater should be insulated with polystyrene tiles, slag wool felt or other equivalent materials with a thickness of about 50mm
A1.3 Air duct system of heater
A1.3.1 No duct is installed at the heater inlet. A short pipe with the same cross-sectional size as the heater outlet and a length equal to one equivalent diameter is installed at the outlet to measure the average wind speed and outlet temperature of the heater outlet cross-sectional area. The outside of the short pipe should be insulated. A1.3.2 Inlet air temperature measurement
The thermometer is placed in front of the heater inlet to measure the inlet air temperature. There are no less than three measuring points and the arithmetic average is taken. A1.3.3 Outlet air temperature measurement
Place the thermocouple thermometer at 2/3 of the equivalent diameter of the heater outlet for measurement. The temperature detection should be evenly distributed throughout the outlet. There should be more than nine measuring points, and the arithmetic average should be taken.
A1.3.4 Outlet wind speed measurement4 Condensate delivery and outlet regulating valve pressure gauge
heater
thermometer
exhaust port
surface gauge
thermometer
The condensate delivery pipe should be equipped with a glass liquid level gauge, and the length of the delivery pipe should not exceed 1000mm. The outlet regulating valve should be able to be adjusted slightly. A1.2.5 Condensate measurement
Condensate is measured by weight or volume, and its minimum division and accuracy should comply with the provisions of Table 7. The condensate deviation (converted to the same time value) of each cycle (referring to the time recorded from 16 measurements) should be within the average value ± 2%. The temperature of the condensate flowing into the collection container should be kept below 50C.
A1.2.6 Insulation
The air-water separator, condensate delivery pipe and the steam inlet and outlet of the heater should be insulated with polystyrene tiles, slag wool felt or other equivalent materials with a thickness of about 50mm
A1.3 Air duct system of heater
A1.3.1 No duct is installed at the heater inlet. A short pipe with the same cross-sectional size as the heater outlet and a length equal to one equivalent diameter is installed at the outlet to measure the average wind speed and outlet temperature of the heater outlet cross-sectional area. The outside of the short pipe should be insulated. A1.3.2 Inlet air temperature measurement
The thermometer is placed in front of the heater inlet to measure the inlet air temperature. There are no less than three measuring points and the arithmetic average is taken. A1.3.3 Outlet air temperature measurement
Place the thermocouple thermometer at 2/3 of the equivalent diameter of the heater outlet for measurement. The temperature detection should be evenly distributed throughout the outlet. There should be more than nine measuring points, and the arithmetic average should be taken.
A1.3.4 Outlet wind speed measurement
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