JB/T 5146.3-1991 Performance test method for humidifiers used in air conditioning equipment
Some standard content:
Mechanical Industry Standard of the People's Republic of China
Humidifier for air conditioning equipment
Performance test method
Subject content and scope of application
This standard specifies the performance test method for humidifiers for air conditioning equipment (hereinafter referred to as "humidifier"). This standard applies to humidifiers specified in JB/T5146.1. 2 Reference standards
Room air conditioner
GB 7725
GB10223 Performance test method for air coolers and air heaters GBJ19 Design specification for heating, ventilation and air conditioning JB/T5146.1 Types and basic parameters of humidifiers for air conditioning equipment 3 Terms
Humidification capacity per unit of electrical power
The ratio of humidification capacity to electrical power consumed when the humidifier is operating under standard conditions, in kg/kW. 3.2 Humidification efficiency
The ratio of humidification capacity to total water consumed when the humidifier is operating under standard conditions. 3.3 Air humidity difference method
JB/T 5146.3—91
A method for directly determining the humidification capacity of a humidifier, measuring the air parameters and air volume before and after the humidifier, and determining the humidification capacity by multiplying the measured air volume by the difference in air humidity before and after the humidifier. 4
Accuracy of test instruments
The accuracy of test instruments shall be as specified in Table 1. Table 1
Temperature measurement
Pressure measurement
Electrical measurement
Measuring instruments
Liquid thermometer
Thermocouple thermometer
Resistance thermometer
Pressure measuring instrument|| tt||Barometer
Indicating type
Integrating type
Approved by the Ministry of Machinery and Electronics Industry of the People's Republic of China on 199107-22 948
Instrument accuracy
! Air dry and wet bulb temperature
Other temperatures
Air dynamic pressure, static pressure
Water pressure, steam pressure
Atmospheric pressurebzxz.net
±1kPa
±10kPa
Implemented on 1992-07-01
Time measurement
Water volume measurement
5 Test conditions
JB/T 5146. 3—91
Continued Table 1
Measuring instruments
Timer
Liquid meter
Liquid meter
5.1 See Appendix A (Supplement) for the test device of humidification amount. 5.2 See JB/T5146.1 for the test conditions.
5.3 All tests of humidifiers shall be carried out according to the rated voltage and frequency on the nameplate. 5.4 The measuring device of dry and wet air temperature shall be in accordance with the provisions of Appendix B (Supplement). 6 Test methods
6.1 Water supply control test
Instrument accuracy
The instrument accuracy shall reach ±0.2% of the measured value. The instrument accuracy shall reach ±0.1% of the measured value. Connect the humidifier to the water supply source, the water supply temperature is 10~16C, run for 1h, and observe the working condition of the water level controller. 6.2 Humidification capacity test
6.2.1 According to the method given in Appendix A and the provisions of Article 6.3 of JB/T5146.1. 6.2.2 When the length of the steam nozzle is greater than 1m and the number is more than 3, nozzles of different lengths and numbers can be used for simulation tests to estimate the humidification capacity after the length and number are increased.
6.3 Power consumption test
According to the method given in Appendix A, measure the input power, voltage, frequency and current while measuring the humidification capacity. 6.4 Humidification efficiency test
6.4.1 For water-supply humidifiers, measure the total water supply while measuring the humidification capacity according to the method given in Appendix A, and calculate according to the methods specified in Articles A4.5 and A4.6.
6.4.2 For steam-supply humidifiers, measure the condensate removal while measuring the humidification capacity according to the method given in Appendix A, and calculate according to the methods specified in Articles A4.5 and A4.6.
6.5 Air circulation resistance test
According to the method given in Appendix A, measure the static pressure difference before and after the mixer while measuring the humidification amount. 6.6 Water cut-off protection operation test
When the humidifier runs to normal working state, cut off the water supply, continue to run until the protection device works, then connect the water supply to normal start, and repeat the above three cycles.
7 Test results and tolerances
7.1 When testing according to the method given in Appendix A, the humidification amount shall be based on the results measured on the air side. 7.2 For steam-generating humidifiers, the difference between the humidification amount measured on the air side and the water consumption on the water side is not more than 5%, and the test is valid. 7.3 When testing the humidification amount, the allowable deviation of each parameter reading shall comply with the provisions of Table 2. 949
Parameter name
Dry bulb temperature, C
De-bulb temperature, ℃
Air static pressure, Pa
Water supply temperature, C
Steam supply pressure, kPa
Voltage, V
JB/T 5146. 3--91
Deviation of the average reading from the specified
operating condition
Rated value±1%
Maximum deviation of a single reading from the specified
operating condition
Rated value±2%
A1 Test device
A1.1 Layout of test device
JB/T 5146.3—91
Appendix A
Air humidity difference method
(Supplement)
The test device of air humidity difference method consists of air handling device, air sampling device, humidifier test section, air mixer, air volume measuring device and water volume measuring device, etc. Its layout is shown in Figure A1. Flow plate ≥300=300300
A1.2 Air handling device
300/300
Static pressure measuring ring
≥1800
Horizontal mixer
a/2, b/2--360 -
Air flow
Measurement device
Dry and wet bulb wetness cancellation device
The air handling device should be able to meet the air and wet bulb temperature ranges and the regulation of air flow rate and pressure required by the performance test. A1.3 Humidifier test section
According to the installation method of the humidifier in the air conditioning equipment, there are two types: steam nozzle installed in the air flow and humidifier installed in the air flow as a whole. A1.3.1 The test section where the steam nozzle is installed in the air flow and the steam generator is installed outside the air flow is shown in Figure A2. The distance between the steam nozzle and the pipe wall should be no less than 200mm.
300,300
≥1500
Pressure measurement point location
Tested mixer
A1.3.2 When the humidifier is installed in the air flow as a whole, it should be installed according to the relevant requirements of the manufacturer, and the humidifier should not be changed in any way. A1.3.3 When the humidifier test section is connected to other devices, transition accessories or corner accessories that have the least interference with the air flow should be used. A1.4 Air mixer
According to the devices and requirements given in Appendix B of GB10223. A2 Test steps
A2.1 Adjust the cooling capacity, heating capacity and air volume of the air handling device so that the dry-bulb and wet-bulb temperatures, air velocity and pressure in the humidifier test section meet the test measurement requirements.
A2.2 When the test conditions are stable, conduct the test for 1 hour continuously, reading once every 10 minutes for 7 consecutive times. A2.3 The humidification capacity is calculated based on the average value of 7 consecutive measurements. 951
A3 Data records
A3.1 General data
Test date;
Tester;
JB/T 5146.3—91
Manufacturer name, model, rated humidification capacity and power of the humidifier under test. A3.2 Measurement parameters
Humidifier input power, W:
Humidifier working voltage, V;
Humidifier working current, A:
Frequency, Hz,
Dry-bulb temperature of air before humidifier, C;
Wet-bulb temperature of air before humidifier, ℃;
Dry-bulb temperature of air after humidifier, C;
t2—Wet-bulb temperature of air after humidifier, C; p.-Static pressure of air in the test section before humidifier, Pa; Ap——Static pressure difference before and after air flow nozzle, Pa; p
Atmospheric pressure, hPa.
A3.3 The humidifier with water supply should also record the following parameters: h.
Initial reading of humidifier water supply tank, m;
Final reading of humidifier water supply tank, mm;
Th-Tha
Time of measuring hihz, h, min; s;
Water supply pressure, kPa:
Water supply temperature, C.
A3.4 The humidifier supplying steam shall also record the following parameters: Wn, Waz
ThnlTa2-
The initial and final weight of condensed water removed by the humidifier, kg: The time for measuring Wnl and Wnz, h, min; s; The supply steam pressure, Pa.
A4 Calculation of test results
A4.1 Calculation of air flow
Calculate according to the formula given in Appendix A of GB10223. A4.2 Calculation of air moisture content
The measured air wet bulb temperature is approximately equal to the thermodynamic wet bulb temperature, dry bulb humidity and atmospheric pressure. Calculate the moisture content using formula (A1). d = d,- (1.005 + 1.86d) × (tg t.)/(2 500.9 + 1.86t- 4.19t.) **(A1) Where: d-
humidity content of air, kg/kg
saturated humidity at wet bulb temperature, d=0.622e/(—e)ew. saturated water vapor partial pressure at wet bulb temperature, hPa,) 5.028 10g(）
logew =10.795 74/ 1 - 1
+ 1.504 75 X 10-4[1 - 10-8.296 9(T/T,-1)]+ 0.428 73 × 10-[104.769 551 -T,/7) - 1] + 0. 786 14952
e ws —— 10log wa
T一273.16K (triple point temperature of water) T,=273.15+tsK;
T2=273.15+t2,K.
A4.3 Calculation of humidification capacity
Wherein: w-—
air humidification capacity, kg/h;
air flow rate, kg/h,
JB/T 5146.3—91
W = q(dz - di)
di, d, air moisture content before and after humidification, kg/kg. A4.4 Calculation of water supply of humidifier
The water supply of humidifier is calculated according to formula (A4):
Wherein: W. water supply of humidifier, kg/h;
K—--calibration coefficient of water supply tank, kg/mm.
A4.5 Calculation of steam supply of humidifier
The steam supply of humidifier is calculated according to formula (A5): K(h, h2)
Th2 — Thi
Wherein: w,--
Steam supply of humidifier, kg/h;
W—·Air humidification amount calculated by measurement, kg/h; W.--Condensate discharged by the measured humidifier, kg/hA4.6
5 Calculation of humidification efficiency
Wherein: 7. -Humidification efficiency.%.
A4.7 Calculation of humidification capacity per unit power
W. = (Wn2 - W.)/(Tn2 -Tl)
n = W/W(W) × 100%
The humidification capacity per unit power is calculated according to formula (A8): E=W/N
Wherein: E——humidification capacity per unit power, kg/kw. Appendix B
Device for measuring dry and wet bulb temperature of air
(Supplement)
B1 Composition of the amount
Green self-mail
(A4)
(A5)
(A6)
(A7)
(A8)
Device for measuring dry and wet bulb temperature of air is used to measure the average temperature and humidity of the air flowing through the section. It is composed of sampling tube, dry and wet bulb temperature measuring tube and fan, as shown in Figure BI. B2
Sampling tube
The sampling tube is set in the test section of the humidifier, and the sampling holes should be evenly distributed in the section, with at least one sampling hole every 0.01m section. 953
B3 Dry-bulb and wet-bulb temperature measuring tubes
JB/T5146.3—91
The equivalent diameter of the dry-bulb and wet-bulb temperature measuring tubes shall not be less than 75mm. The temperature sensing elements of the dry-bulb and wet-bulb temperature measuring instruments shall be close to each other so as to measure the same sampled air. The dry-bulb thermometer shall be located upstream or on one side of the wet-bulb thermometer so that the measurement result of the dry-bulb temperature will not be affected by the evaporation of water in the wet-bulb thermometer. The outside of the measuring tube shall be insulated. B4 Sampling fan
The sampling fan shall be located downstream of the thermometer to prevent the heat generated by the fan from affecting the thermometer reading. Its air flow rate shall ensure that the wind speed passing through the wet-bulb thermometer is 5±1m/s.
B5 Provisions for determining the dry-bulb and wet-bulb temperature
B5.1 The wet-bulb gauze cover shall be made of special gauze that has been degreased. The gauze shall be close to the temperature sensing element and overlap by 1/4 of a circle. To prevent heat from being transmitted from the upper connecting rod of the temperature sensing element, the gauze should also cover the upper connecting rod by about 2.5 cm. B5.2 The gauze cover should be washed or replaced frequently. Use distilled water to moisten the gauze. B5.3 When the measured air may contain water, a protective cover should be added to prevent moisture from accumulating on the temperature sensing coil. Sampling tube
Measuring tube
Dry bulb thermometer
Wet bulb thermometer
Figure B1 Sampling device
Additional instructions:
This standard was proposed and managed by the Hefei General Machinery Research Institute of the Ministry of Machinery and Electronics Industry. This standard was drafted by the Air Conditioning Research Institute of the China Academy of Building Research and Beijing Qingyun Instrument Factory. The main drafters of this standard: Huang Zhimei and Liu Zongyuan. 954l)
n = W/W(W) × 100%
The unit power humidification capacity is calculated according to formula (A8): E=W/N
Wherein: E——unit power humidification capacity, kg/kw. Appendix B
Air dry and wet bulb temperature measuring device
(Supplement)
B1 Composition of the amount
Green self-mail
(A4)
(A5)
(A6)
(A7)
(A8)
The air dry and wet bulb temperature measuring device is used to measure the average temperature and humidity of the air flowing through the section. It is composed of a sampling tube, a dry and wet bulb temperature measuring tube and a fan, as shown in Figure BI. B2
Incoming sample tube
The sampling tube is located in the test section of the humidifier, and the sampling holes should be evenly distributed in the section, with at least one sampling hole every 0.01m section. 953
B3Dry and wet bulb temperature measuring tube
JB/T5146.3—91
The equivalent diameter of the dry and wet bulb temperature measuring tube should not be less than 75mm, and the temperature sensing elements of the dry and wet bulb temperature measuring instruments should be close to each other so as to measure the same sampled air. The dry bulb thermometer should be located upstream or on one side of the wet bulb thermometer so that the measurement result of the dry bulb temperature will not be affected by the evaporation of water in the wet bulb thermometer. The outside of the measuring tube should be insulated. B4Sampling fan
The sampling fan should be located downstream of the thermometer to prevent the heat generated by the fan from affecting the thermometer reading. Its air flow should be able to ensure that the wind speed flowing through the wet bulb thermometer is 5±1m/s.
B5 Provisions for determining dry-bulb and wet-bulb temperatures
B5.1 The wet-bulb gauze cover should be made of degreased special gauze. The gauze should be close to the temperature sensing element and overlapped by 1/4. To prevent heat from being transmitted from the upper connecting rod of the temperature sensing element, the gauze should also cover the upper connecting rod by about 2.5 cm. B5.2 The gauze cover should be washed or replaced frequently. Use distilled water to moisten the gauze. B5.3 When the measured air may contain water, a protective cover should be added to prevent moisture from accumulating on the temperature sensing coil. Sampling tube
Measuring tube
Dry-bulb thermometer
Wet-bulb thermometer
Figure B1 Sampling device
Additional notes:
This standard is proposed and managed by the Hefei General Machinery Research Institute of the Ministry of Machinery and Electronics Industry. This standard is drafted by the Air Conditioning Research Institute of the China Academy of Building Research and Beijing Qingyun Instrument Factory. The main drafters of this standard are Huang Zhimei and Liu Zongyuan.l)
n = W/W(W) × 100%
The unit power humidification capacity is calculated according to formula (A8): E=W/N
Wherein: E——unit power humidification capacity, kg/kw. Appendix B
Air dry and wet bulb temperature measuring device
(Supplement)
B1 Composition of the amount
Green self-mail
(A4)
(A5)
(A6)
(A7)
(A8)
The air dry and wet bulb temperature measuring device is used to measure the average temperature and humidity of the air flowing through the section. It is composed of a sampling tube, a dry and wet bulb temperature measuring tube and a fan, as shown in Figure BI. B2
Incoming sample tube
The sampling tube is located in the test section of the humidifier, and the sampling holes should be evenly distributed in the section, with at least one sampling hole every 0.01m section. 953
B3Dry and wet bulb temperature measuring tube
JB/T5146.3—91
The equivalent diameter of the dry and wet bulb temperature measuring tube should not be less than 75mm, and the temperature sensing elements of the dry and wet bulb temperature measuring instruments should be close to each other so as to measure the same sampled air. The dry bulb thermometer should be located upstream or on one side of the wet bulb thermometer so that the measurement result of the dry bulb temperature will not be affected by the evaporation of water in the wet bulb thermometer. The outside of the measuring tube should be insulated. B4Sampling fan
The sampling fan should be located downstream of the thermometer to prevent the heat generated by the fan from affecting the thermometer reading. Its air flow should be able to ensure that the wind speed flowing through the wet bulb thermometer is 5±1m/s.
B5 Provisions for determining dry-bulb and wet-bulb temperatures
B5.1 The wet-bulb gauze cover should be made of degreased special gauze. The gauze should be close to the temperature sensing element and overlapped by 1/4. To prevent heat from being transmitted from the upper connecting rod of the temperature sensing element, the gauze should also cover the upper connecting rod by about 2.5 cm. B5.2 The gauze cover should be washed or replaced frequently. Use distilled water to moisten the gauze. B5.3 When the measured air may contain water, a protective cover should be added to prevent moisture from accumulating on the temperature sensing coil. Sampling tube
Measuring tube
Dry-bulb thermometer
Wet-bulb thermometer
Figure B1 Sampling device
Additional notes:
This standard is proposed and managed by the Hefei General Machinery Research Institute of the Ministry of Machinery and Electronics Industry. This standard is drafted by the Air Conditioning Research Institute of the China Academy of Building Research and Beijing Qingyun Instrument Factory. The main drafters of this standard are Huang Zhimei and Liu Zongyuan.
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