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Calculation of Ventilation

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Calculation of Ventilation

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Calculation of Ventilation

The modification of the flap position is calculated according to following formula




L flap = ( deviation D-component)* VF *Gain pos

in the :  deviation = internal temperature – set value

D-component = (internal temperature – internal temperature last ) * difference time / sample time

Gain pos = Gain + position * ( Gain - Gain ) / l00

VF = 1.0, if outside temperature is higher than internal temperature - 8.0 °C, otherwise

VF = 1.0 – winter factor) * (internal temperature –outside temperature - 8) / 12

Example 1:

Gain @ 100 % 1.8 %

Gain@0%  0.8%

accept belt 0.1 °C

sample time 2 Min.

winter factor 1.0

difference time 15 Min.

time

set value

temp

outside tem.

ventilation

deviation

D-comp.

Gain

winter factor



~37.9

~36.9

deviation = 28.7 - 28.0 = 0.7 °C

D-component = (28.7 - 28.7) * 15/ 2 = 0

Gain = 0.8 + 33.3 * (1.8-0.8) / 100 = 1.133

Lflap

deviation = 28.9 - 28.0 = 0.9 °C

D-component = (28.9 - 28.7) * 15 / 2 = 1.5

Gain = 0.8 + 34.1 * (1.8-0.8) / 100 = 1.141

Lflap

deviation

D-component =

Gain =

Lflap

deviation

D-component -

Gain =

L * 1.0 --------- * -------------(-0.94)







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