Nawiew

Nawiew is a term used in ventilation and heating, ventilation, and air conditioning (HVAC) to denote the supply of air into a space. In Polish usage it refers to the inflow of air that is introduced to occupy space, as distinct from wywiew (exhaust) or recirculated air. The concept covers both outdoor air brought into a building and air that is mixed with return air from the space.

In HVAC systems, nawiew air is delivered through ducts and diffusers or grilles, and is produced by air handling units, fans, and sometimes air handling equipment located outdoors. The key characteristics of nawiew include the volume flow rate, supply air temperature, humidity, and velocity, all of which influence thermal comfort and indoor air quality. Common components associated with nawiew are nawiewnik (supply diffuser or grille) and przewody nawiewne (supply ducts).

Types and sources of nawiew differ by building design. Mechanical nawiew uses fans to introduce outdoor air or混合 air into occupied zones, often with filtration and heat exchange. Natural nawiew relies on openings and pressure differences to allow air entry. In many modern buildings, outdoor air is mixed with return air to balance energy use and air quality.

Design considerations include ensuring adequate and uniform distribution of supply air, avoiding uncomfortable drafts, and meeting standards for ventilation rates. Balancing, commissioning, and acoustic control are important to performance. Standards and guidelines from national and international bodies inform outdoor air requirements and system effectiveness for various building types.