Definition
Face velocity is the approach speed of air entering the core face:
face_velocity = volumetric_flow / core_face_area
It is measured in metres per second (m/s).
Typical range
For HVAC air-to-air cores, face velocity usually sits between 1.5 and 3.5 m/s. Lower is gentler on the core and the fan; higher packs more flow into a smaller core.
The core-size vs pressure-drop trade-off
Doubling face velocity roughly quadruples the Caída de presión across the core, which raises fan power. But a smaller core is cheaper and fits tighter casings. Selection is a balance: pick the face area that meets effectiveness at an acceptable fan penalty. This is the same lever discussed for los intercambiadores de placas and their pressure-drop budgets.
Frequently asked questions
Is higher face velocity ever good? Only when space is tight and fan energy is cheap; otherwise lower velocity wins on lifecycle cost.
Does face velocity equal duct velocity? Not exactly – it is referenced to the core opening, which may differ from the connecting duct.
Need help specifying the right air-to-air heat recovery for your project? Contact the QIYU engineering team – WhatsApp +86 157 5335 5505, or email kuns913@gmail.com.
Preguntas frecuentes
What is face velocity?
Face velocity is the volumetric airflow divided by the frontal area of the core; it is the speed of air entering the exchanger face.
Why does face velocity affect pressure drop?
Pressure drop rises roughly with the square of face velocity, while effectiveness improves only marginally; lowering face velocity with a larger core is the usual way to cut fan energy.
Preguntas frecuentes
What is face velocity?
Face velocity is the volumetric airflow divided by the frontal area of the core; it is the speed of air entering the exchanger face.
Why does face velocity affect pressure drop?
Pressure drop rises roughly with the square of face velocity, while effectiveness improves only marginally; lowering face velocity with a larger core is the usual way to cut fan energy.
Especifique el intercambiador adecuado
Nuestros ingenieros dimensionan el núcleo según su caudal, temperatura y presupuesto de caída de presión, y seleccionan recuperación por placa, rotativa o caloduc según la aplicación. Lea la guía del intercambiador , o contáctenos para una especificación.
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