Design of an Automatic Control Algorithm for Energy-Efficient ...

8 System and functionality integration 79
to the passenger.
� � � �������� ¡ ����� � ������ ¡ ������ � ���������
with ����� � ������ � ��������� ��.
Scaling and weight
¡ ���������
(8.11)
As scaling a figure based on the PMV, called the predicted percentage of dissatisfied (PPD)
could be used. It is defined as
is found.
��� �� ���� ¡ � � �������¡���� ������¡��� � �
This gives as result of the thermal comfort objective function
������ � ��� ¡ ����
(8.12)
(8.13)
In DIN 7730, appendix D [7], an implementation of a thermal comfort calculation
8.1.3 Air speed comfort
As mentioned in Section 2.2.2, the air speed itself can cause discomfort. Using a different
comfort model, this objective could be included in a general thermal aspect. Here it has
to be implemented in a separate function.
The air speed towards the passengers is calculated by the air volume going through
the face-outlets divided by their area. When reaching the persons the maximum speed
��������� is reduced with a distance � (assuming circular outlets with a diameter �������)
[16].
��������� ���� ¡ �������
�
��������
¡
������������� ¡ ����
The temperature change in the jet is not taken into account here.
(8.14)
Based on Figure 2.3 an air speed comfort area is defined. Similar to the fogging