1 Scope
This standard specifies the energy efficiency grades, minimum allowable values of energy efficiency, test methods and technical requirements for fan.
This standard applies to centrifugal fans for general use, axial fans for general use, centrifugal induced draft fans for industrial boilers, centrifugal fans for power station boilers, axial fans for power stations, centrifugal fans for HVAC and forward multi-wing centrifugal fans.
This standard does not apply to duct type fans for AC, box type fans, centrifugal fans without volute and fans with special structures or for other uses.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 1236 Industrial fan - Performance testing using standardized airways
GB/T 3235 Basic types sizes parameters and characteristics curve of fans
GB/T10178 Industrial fans - performance testing in situ
JB/T 2977 Technical terms for industry fans, turbo-blowers and compressors
JB/T 4357 Centrifugal ID - fan for industry boiler
JB/T 4358 Centrifugal fan for boiler of power station
JB/T 4362 Power station axial fans
JB/T 7221 Centrifugal fan for heating ventilation and air conditioner
JB/T 9068 Forward curved centrifugal fan
JB/T 10562 Technical specification for general purposes axial fans
JB/T 10563 Technical specification for general purposes centrifugal fans
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 1236, GB/T 3235 and JB/T 2977 and the following apply.
3.1
minimum allowable values of energy efficiency for fan
minimum allowable guaranteed value of efficiency for fan under the test conditions specified in the standard
3.2
plant
device consisting of a driver and a fan
4 Energy efficiency grade
The energy efficiency of a fan is classified into 3 grades, among which Grade 1 represents the highest energy efficiency, while Grade 3 represents the lowest. The requirements are as follows:
a) Centrifugal fan
1) The maximum fan efficiency ηr in stable working area shall not be lower than those specified in Table 1 and Table 2;
2) The maximum fan efficiency of centrifugal fans of common motor direct connection type (type A drive) in stable working area shall not be lower than those specified in Table 1 and Table 2;
3) The efficiency ηr of double-suction centrifugal fan in stable working area shall be reduced by 1 percentage point for Grades 1 and 2 according to those specified in Table 1 and Table 2, and by 3 percentage points for Grade 3;
4) The efficiency ηr of HVAC in stable working area shall be reduced by 1 percentage point for Grades 1 and 2 according to those specified in Table 1 and Table 2, and by 3 percentage points for Grade 3;
5) When there is an inlet box at the inlet, the efficiency ηr for each grade in stable working area shall be reduced by 4 percentage points according to those specified in Table 1 and Table 2;
6) For the forward multi-wing centrifugal fan with external rotor motor (except single-phase and three-phase multi-speed type, three-phase six-pole or above), the maximum unit efficiency shall not be lower than those specified in Table 4.
b) Axial fan
1) The maximum fan efficiency in stable working area shall not be lower than those specified in Table 3;
2) The maximum efficiency of centrifugal fans of common motor direct connection type (type A drive) in stable working area shall not be lower than those specified in Table 3;
3) When there is an inlet box at the inlet, it shall be reduced by 3 percentage points according to those specified in Table 3;
4) When the outlet is equipped with diffuser, the efficiency value shall not be lower than the provisions in Table 3 that 0.55<γ<0.75, and the machine number > No10. When there is no diffuser at the outlet of the fan, the efficiency value shall be increased by 2 percentage points from those in Table 3.
5) For axial fans with adjustable moving blades (synchronous adjustment of moving blade angle completed in operation), the efficiency value shall be not less than 89.5% for Grade 1, 87% for Grade 2 and 82% for Grade 3, under the condition that there is no inlet box at the inlet and no diffuser at the outlet;
6) For reversible axial fan, the efficiency value shall be reduced by 8 percentage points according to those specified in Table 3.
