This mode is intended for a mechanical ventilation system where the ventilation is controlled from a single zone's dry bulb temperature. There is a minimum ventilation rate specified in l/s/m^2. The additional ventilation starts when the temperature in the zone reaches the lower limit and increases proportionally until the upper limit is reached and the maximum ventilation value plus the minimum value will apply.
This mode requires the following parameters.
Parameter |
Description |
Zone |
The zone number whose dry bulb temperature will control the ventilation. If you enter 0 for this value, the ventilation will be controlled on the temperature of the zone that this internal condition is applied to. |
Lower limit |
The additional ventilation will be off if the controlling zone dry bulb temperature is below this value. |
Upper limit |
The function will give the maximum ventilation value equal to the additional vent plus the minimum ventilation rate when the controlling zone dry bulb temperature is above this value. |
Minimum Ventilation Value |
The minimum amount of ventilation used at any given hour where this function is used. It is measure in l/s/m^2. |
Addition Vent Value |
The maximum amount of additional ventilation used at any given hour where this function is used. It is measure in air changes per hour. |
For example, 'tmmvc,0,24,26,1.11,5' would define the following strategy for ventilation.
There will be a minimum ventilation rate of 1.11l/s/m^2 supplied during the occupied period, it will be independent of dry bulb temperature. As the dry bulb temperature in the adjacent zone rises above 24 deg. C an additional ventilation rate will be provided. The additional ventilation will be on at its peak value of 5ACH when the temperature within the zone is at or above 26 deg C. The minimum ventilation rate will be added onto this value. For a full description of how final ventilation values are calculated, please see the section: Ventilation Functions.