2.8 Design Primary Energy Consumption

The design primary energy consumption of air conditioning equipment is calculated by the following formula. If evaluating an air handling unit group without a secondary pump, the calculation is performed assuming that a virtual secondary pump (no control over the number of devices, temperature difference 0, rated flow rate 0, rated power consumption 0, rated flow rate control method) is installed between the air handling unit group and the heat source group.

Table 150. Input

Variable Name	Description	Unit	Reference
\(E_{AC,ahu,i}\)	Annual primary energy consumption of the air handling unit group	MJ/year	2.5.12
\(E_{AC,pump,i}\)	Annual primary energy consumption of the secondary pump group	MJ/year	2.6.10
\(E_{AC,ref,i}\)	Annual primary energy consumption of the heat source group	MJ/year	2.7.18

Table 151. Output

Variable Name	Description	Unit	Reference
\(E_{AC}\)	Annual primary energy consumption of air conditioning equipment	MJ/year	－

\[ E_{AC} = \sum_{i=1} E_{AC,ahu,i} + \sum_{i=1} E_{AC,pump,i} + \sum_{i=1} E_{AC,ref,i} \]