A type of fire dynamics analysis model that divides each room into two or more spaces.

A type of fire dynamics analysis model that divides each room into two or more spaces.

• A. CFD Model
• B. One-Zone Model
• C. Zone Model
• D. Lumped-Parameter Model

Answer: (C)

Zone models represent the environment as several interconnected spaces rather than a single uniform volume. By dividing each room into two or more spaces, you can capture how hot gases stratify and how air moves between different parts of the room through openings, doors, or vents. Within each zone, conditions are treated as well-mixed, so you can apply straightforward mass and energy balances to describe heat transfer, gas movement, and pressure-driven flows between zones. This approach sits between a full CFD analysis and a single-room lumped model: it provides more spatial detail than a one-zone model without the heavy computational burden of resolving detailed flow fields everywhere. That division of a room into multiple zones is the hallmark that points to a zone model.

Zone models represent the environment as several interconnected spaces rather than a single uniform volume. By dividing each room into two or more spaces, you can capture how hot gases stratify and how air moves between different parts of the room through openings, doors, or vents. Within each zone, conditions are treated as well-mixed, so you can apply straightforward mass and energy balances to describe heat transfer, gas movement, and pressure-driven flows between zones. This approach sits between a full CFD analysis and a single-room lumped model: it provides more spatial detail than a one-zone model without the heavy computational burden of resolving detailed flow fields everywhere. That division of a room into multiple zones is the hallmark that points to a zone model.