This standard specifies the test methods for variable air volume terminal devices. JB/T 5148-1991 Test methods for variable air volume terminal devices JB/T5148-1991 Standard download decompression password: www.bzxz.net

1 Subject content
Machinery Industry Standard of the People's Republic of China
Variable air volume terminal device
Test method
This standard specifies the test method for variable air volume terminal devices. 2 Reference standards
GB8070 Air distributor performance test method 3 Test method
3.1 Air volume and pressure loss test
JB/T 5148-91
3.1.1 The air volume and pressure loss test of the variable air volume terminal device shall be carried out under isothermal conditions (i.e., the supply air temperature is equal to the room temperature or the temperature difference between the two is not greater than 2°C).
3.1.2 The variable air volume terminal device shall change at least 4 opening degrees of the actuator (i.e., the opening degrees are 25%, 50%, 75%, and 100%), and 4 air flow and pressure loss tests shall be performed for each opening degree. 3.1.3 The air volume and pressure loss test device shall consist of a fan, a flow control device, an air flow measurement device, a pressure measurement device and a variable air volume terminal device (see Figure 1)
Air flow transposition
Flow control device
Liquid column pressure gauge
3.1.4 The air flow measurement device shall comply with the provisions of Article 2.4.2.1 of GB8070. Pressure measurement device
Liquid column pressure gauge
3.1.5 The pressure loss test device shall comply with the provisions of Articles 3.1.5.1 and 3.1.5.2 of GB8070. 3.1.6 The total pressure of the measuring surface shall comply with the provisions of Article 3.1.5.4 of GB8070. 3.1.7 Record the flow and static pressure values ​​while conducting the air flow and pressure loss tests. 3.1.8 Calculation of measured values
3.1.8.1 The calculation of air flow shall be in accordance with the provisions of Chapter A4 in Appendix A of GB8070. Variable air volume terminal device
3.1.8.2 The measured value of pressure shall be corrected to the pressure value of the air in the standard state (atmospheric pressure 101.325kPa, temperature 20℃, density 1.2kg/m2, relative humidity 65%), that is, the ratio of the measured pressure value multiplied by the density of the air in the standard state (p) to the actual air density (p) on the measuring surface, and the measured pressure and air flow shall be plotted into a total pressure (pt) or static pressure (force)-air flow (Q) relationship diagram for different opening degrees of the actuator of the variable air volume terminal device.
The Ministry of Machinery and Electronics Industry of the People's Republic of China approved 706 on July 22, 1991
Implementation on July 1, 1992
JB/T5148-91
3.1.8.3 The local resistance coefficient of the variable air volume terminal device is calculated as follows: +1
Where: p.
Static pressure measurement value, Pa;
2 (%), where P and Q are obtained under the same test conditions, A is the area (m) of the static pressure measurement surface section 1Q12
dynamic pressure, Pap.=o/2
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3.2 Temperature control test
3.2.1 The temperature control test device of the variable air volume terminal device is the same as that of Article 3.1.3, and a temperature regulating device that can control the temperature is also set.
3.2.1.1 The temperature control device shall have cooling and heating functions, the temperature inside the device shall be uniform, and the temperature fluctuation value shall be ±0.2℃. 3.2.1.2 The air flow measurement device shall comply with the requirements of Article 3.1.4. 3.2.2 Adjust the flow control device to make the flow reach a fixed value. Place the temperature sensing element of the variable air volume terminal device in the temperature control device, and perform the temperature control test according to the following steps:
a. Adjust the temperature in the temperature control device to reach the set temperature of the room temperature controller of the variable air volume terminal device. After stabilization, record the air flow.
b. Adjust the temperature in the temperature control device to be higher than the set temperature of the room temperature controller of the variable air volume terminal device, and record the air flow after the actuator stops moving;
c. Perform the test specified in Article b in the opposite direction. 3.3 Air supply jet characteristic test
The air supply jet characteristic test of the variable air volume terminal device should be equipped with an air supply port, and the test should be carried out under isothermal air supply conditions in the specified environment. The jet characteristics include the range (X), diffusion width (Y) and the drop distance or rise distance (Z). The jet characteristics shall be determined by tests at least at 4 opening degrees (25%, 50%, 75%, 100%) of the actuator under different flow rates. 3.3.1 The test room shall comply with the provisions of Article 4.7 of GB8070. 3.3.2 The air supply system of the test room shall consist of a fan, an air flow regulating device, an air flow measuring device, a test air duct and a variable air volume terminal device.
3.3.3 The thermometer in the test room shall be arranged in the test air duct upstream of the variable air volume terminal device, in the working area or the center of the return air outlet of the test room.
The air outlet of the variable air volume terminal device shall be installed in accordance with Figure 2. It shall be installed according to the requirements of the design or manufacturer. 3.3.4
Diffuser
3.3.5 The test requirements shall comply with the provisions of Articles 4.4.1 to 4.4.4 of GB8070. 3.3.6 The maximum center velocity of the jet shall be measured in accordance with the provisions of Article 4.5.1 of GB8070. 3.3.7 The flow envelope surface shall be measured in accordance with the provisions of Article 4.5.2 of GB8070. 3.3.8 The range shall be determined in accordance with the provisions of Article 4.5.3 of GB8070. 3.3.9 The diffusion width shall be determined in accordance with the provisions of Article 4.5.4 of GB8070. 3.3.10 The descending distance or ascending distance shall be determined in accordance with the provisions of Article 4.5.5 of GB8070. Slit-type air outlet
3.4 ​​Insulation resistance test
JB/T 5148--91
Under the conditions of normal temperature and relative humidity not exceeding 80%, use a 500V insulation resistance meter to measure the insulation resistance between the live part and the non-live part of the variable air volume terminal device.
3.5 Electric Strength Test
Apply 1500V rated frequency AC voltage between the live part and the non-live metal part of the variable air volume terminal device. The voltage should not be greater than half of the specified value at the beginning, and then quickly rise to the full value and last for 1 minute. 3.6 Operation Test
3.6.1 The control circuit of the variable air volume terminal device is reliably connected to the actuator and adjustment mechanism, and there is no abnormality. 3.6.2 Each variable air volume terminal device should be opened and closed for at least 10 consecutive times, and the movement should be flexible. Check that there should be no abnormality between the components.
3.7 Test Measuring Instruments
3.7.1 The air temperature measuring instrument shall comply with the provisions of Article 2.1 of GB8070. 3.7.2 Air pressure measuring instrument
3.7.2.1 The air pressure measuring instrument in the pipeline shall comply with the provisions of Article 2.2.1 of GB8070. 3.7.2.1.1 The minimum division of the pressure gauge shall comply with the provisions of Article 2.2.1.1 of GB8070. 3.7.2.1.2 The accuracy of the pressure gauge shall comply with the provisions of Article 2.2.1.2 of GB8070. 3.7.2.2 The atmospheric pressure measuring instrument of the test environment shall comply with the provisions of Article 2.2.2 of GB8070. 3.7.3 The air velocity measuring instrument shall comply with the provisions of Article 2.3 of GB8070. 3.7.4 Air flow measuring instrument
3.7.4.1 The accuracy of the air flow meter shall comply with the provisions of Article 2.4.2 of GB8070. 3.7.4.2 The air flow measuring instrument shall comply with the provisions of Article 2.4.2.1 of GB8070. Additional remarks:
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 Tongji University.
The main drafter of this standard: Zhang Enze.
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