GB19761-2020

Minimum allowable values of energy efficiency and energy efficiency grades for fan

通风机能效限定值及能效等级

GB 19761-2020 es una norma nacional china obligatoria vigente: Minimum allowable values of energy efficiency and energy efficiency grades for fan. Sector: Construcción. Enfoque: Eficiencia energética. Entrada en vigor: 1 jun 2021.

La aplicabilidad depende del alcance del producto, la vía de certificación, los avisos de la autoridad competente y las reglas de transición. Solicite una traducción o verifique la fuente antes de usar esta ficha en una decisión de cumplimiento.

Resumen de cumplimiento

Este resumen está disponible por ahora solo en inglés.

Alcance y aplicabilidad

This standard applies to general-purpose centrifugal fans, axial fans, industrial boiler induced draft fans, power station boiler fans, HVAC centrifugal fans, and forward-curved multi-blade centrifugal fans. It explicitly excludes ducted fans, cabinet fans, housing-less centrifugal fans, and other special structural types. Engineers must verify their specific fan category against this scope to determine compliance requirements.

Requisitos técnicos

The standard categorizes fan energy efficiency into three grades, where Grade 1 represents the highest efficiency and Grade 3 represents the minimum allowable value. For centrifugal fans, the requirements are determined by the pressure coefficient and specific speed, with specific adjustments applied for double-suction configurations and HVAC applications. Grade 3 serves as the mandatory minimum efficiency limit for market access. For axial fans, efficiency grades are evaluated based on the hub ratio and fan size, with distinct penalty reductions applied if an inlet box is present or if the fan is reversible. The standard also introduces specific efficiency calculation methods for fans directly coupled with ordinary motors and external rotor motors. The standard defines critical calculation formulas for fan efficiency, unit efficiency, pressure coefficient, and specific speed. Manufacturers must use the highest efficiency point within the stable working zone as the assessment value for compliance.

Métodos de ensayo

Performance testing must be conducted using a full-size fan according to the standardized airway methods specified in GB/T 1236 or the field performance testing procedures in GB/T 10178. If multiple test setups are applicable, the one closest to the actual application must be selected. When using electrical measurement to calculate efficiency, the motor efficiency characteristic curve must be provided.

Preguntas frecuentes

What products are regulated under GB 19761-2020?

This standard applies to general-purpose centrifugal fans, general-purpose axial fans, industrial boiler centrifugal induced draft fans, power station boiler fans, HVAC centrifugal fans, and forward-curved multi-blade centrifugal fans. It does not apply to ducted fans, cabinet fans, or housing-less centrifugal fans.

Are there any updates from the previous version of GB 19761?

The 2020 version adjusts the scope to explicitly include HVAC centrifugal fans and forward-curved multi-blade centrifugal fans. It also modifies the efficiency grades for various fan types, updates the calculation methods for direct-drive fans, and removes the concept of 'energy efficiency evaluation values' found in the 2009 version.

How does GB 19761-2020 differ from international fan standards?

The standard references GB/T 1236 and GB/T 10178 for its performance testing methodologies. While these are aligned with international ISO testing principles, the specific efficiency grading tiers and mandatory minimum allowable values are uniquely established for the Chinese market.

The summary above provides a high-level overview of GB 19761-2020. To ensure complete compliance for your products entering the Chinese market, a precise and professional translation of the full technical specifications is essential. Purchase our high-quality English translation of GB 19761-2020 today to access all detailed efficiency parameters, calculation formulas, and testing procedures.

Indicaciones de aplicabilidad

Tipo: Básica
CCS: F01
ICS: 27.010
Organismo competente: Standardization Administration of China
Comité técnico: National Technical Committee on Energy Fundamentals and Management of Standardization Administration of China

Relaciones

Sustituye a:GB 19761-2009