*5.3. Results: Faults' Impact on Electric Energy Consumption*

Table 14 shows the electric energy consumptions of: the heat pump (EEHP), the refrigerating system (EERS), the humidifier (EEHUM), the supply air fan (EESAF), the return air fan (EERAF), and the total electric energy consumption (EETOT), with and without faults; in particular, the values associated to the faulty tests have been derived as outputs of the TRNSYS model by using the measured data as inputs, while the values associated to the fault free tests have been predicted by the coupling of the ANN16 and the TRNSYS model. Moreover, Table 14 reports the energy percentage difference (EPD) that has been valuated as follows:

$$\text{EPD} = \frac{\text{EE}\_{\text{W/o\\_fault,i}} - \text{EE}\_{\text{fault,i}}}{\text{EE}\_{\text{W/o\\_fault,i}}} \times 100\tag{19}$$

where EEw/o\_fault,i and EEfault,i are, respectively, the electric energy consumption of AHU component for the case without faults and with one of the above-mentioned faults.


**Table 14.** Electric energy consumption with and without faults.
