TWO-ZONE MODEL DESCRIPTIONZonal Models

Zonal models are often used in analytical calculation of temperature, concentra­tion, or humidity conditions in ventilated spaces. The space is divided in two or several zones, which typically have different target levels as described in Section 2.1.1—3 These typical zones can also be divided into additional subzones.

The zoning of the space is based on the assumption of constant tempera­ture, concentration, and humidity in each separate zone.4’5 The boundaries be­tween the zones can be vertical or horizontal. The balances for air mass flow, contaminant mass flow, water vapor mass flow, and heat flow are determined between zones and between zone and outer boundaries.

Zonal models can be applied for each room air conditioning strategy (see Section 8.6), but they are mostly used in stratification and zoning strategies with different air distribution methods (see Section 8.7).

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