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Calculation of Ventilation

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Calculation of Ventilation

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 0% + position * ( Gain 100% - Gain 0% ) / l00

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

                VF = 1.0 ( 1 – 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

10:00

28.0

28.7

10.0

33.3

10:02

28.0

28.7

9.7

33.3+ 0.79 ~34.1

0.7

0

1.133



1.0

10:04

28.0

28.9

9.5

34.1+ 2.74 ~36.8

0.9

1.5

1.141

1.0

10:06

28.0

28.9

9.4

------------  ~37.9

10:08

28.0

28.7

9.5

------------  ~36.9

10:02

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 = (0.7 + 0.0) * 1 .0 * 1.133 = 0.7931

10:04

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 = (0.9 + 1.5) * 1.0 * 1.141 = 2.7384

10:06

deviation =

D-component =

Gain =

Lflap = (-------- +--------- ) * 1.0 --------- * -------------(1.05)

10:08:

deviation =

D-component -

Gain =

L = (-------- +--------- ) * 1.0 --------- * -------------(-0.94)





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