primary air flow

  • Airflow Measurement and Management Systems

    Because many other optimization steps assume accurate measurement of primary air, air metering and control should be one of the first steps in the optimization of a pulverized coal-fired boiler. Depending on the location in the ductwork, venturis or flow nozzles are preferred.

  • Understanding Air Barriers | Building Science Corporation

    Oct 24, 2006 · Air barriers are systems of materials designed and constructed to control airflow between a conditioned space and an unconditioned space. The air barrier system is the primary air enclosure boundary that separates indoor (conditioned) air and outdoor (unconditioned) air.

  • Secondary flow - Wikipedia

    In fluid dynamics, a secondary flow is a relatively minor flow superimposed on the primary flow, where the primary flow usually matches very closely the flow pattern predicted using simple analytical techniques that assume the fluid is inviscid. (An inviscid fluid is a theoretical fluid having zero viscosity.). The primary flow of a fluid, particularly in the majority of the flow field remote ...

  • Primary and Secondary circuits in centralised HVAC systems

    May 15, 2017 · Newer designs may have variable flow primary pumps although a minimum flow rate must be ensured. In both cases the chiller or boiler manufacturers will specify a minimum flow rate that must be achieved, if the flow rate falls below this, the chiller or boiler can freeze or overheat which may result in catastrophic failure.

  • Role of Primary Air Fan and Secondary Air Fan in Thermal ...

    May 17, 2018 · Primary air ( pa fan) and Secondary air fan have an important role to play in fuel combustion and must be provided in different ratios according to the fuel quantity. PA or Primary Air fans are important item in a thermal plant ( boilers) as it lifts and carry coal to destination.