## 4 Results and Discussion
### Potential of Energy Savings in Terms of Primary Energy Per Year (MW/h)  
To obtain the energy savings for each of the POS (Table 7), it has to be defined in the tool the climatic zone, the energy cost for the country, the reference building, spinned (if the main facades are orientated differently to the reference building), the interest rate, \begin{table}
\begin{tabular}{c c c c c c c c c c c c} \hline \hline  & \multicolumn{2}{c}{**SFH1**} & \multicolumn{2}{c}{**SFH2**} & \multicolumn{2}{c}{**SFH3**} & \multicolumn{2}{c}{**MFH1**} & \multicolumn{2}{c}{**MFH2**} & \multicolumn{2}{c}{**MFH3**} \\ \hline  & **N-S** & **E-W** & **N-S** & **E-W** & **N-S** & **E-W** & **N-S** & **E-W** & **N-S** & **E-W** & **N-S** & **E-W** \\ \hline W1S2 & POS5 & \begin{tabular}{c} POS5 \\ spinned \\ \end{tabular} & POS12 & \begin{tabular}{c} POS12 \\ spinned \\ \end{tabular} & POS13 & \begin{tabular}{c} POS12 \\ spinned \\ \end{tabular} & POS14 & POS15 & POS12 & POS12 & POS12 & POS13 & POS12 & POS12 & POS13 & POS13 & POS12 & POS13 & \
\begin{tabular}{c} POS9 \\ spinned \\ \end{tabular} \\ W2S2 & POS5 &
\begin{tabular}{c} POS5 \\ spinned \\ \end{tabular} & POS5 & POS14 & POS14 & POS14 & POS15 & POS15 & POS15 & POS16 & POS17 & POS18 \\ \hline \hline \end{tabular}
\end{table} 
Table 7: POS according to the type of building and orientation, and climate zone in Comunitat Valenciana region. inflation, and years. In the case of POS1, W1S2 and the reference building located in Cyprus (Figure 5). For the different constructive elements (slabs, roofs, etc. ), what can be changed is the cost (\(\epsilon/\text{m}^{2}\)). Moreover, different systems for heating, cooling, and domestic hot water can be chosen. For the purpose of this study, the energy costs of Spain apply, and the interest rate of 3.5% and inflation of 2% are fixed values for all the cases. It has been selected 30 years as described in the LCC calculation [5]. The aim of the paper was to analyse the potential for reducing global consumption. For the reference heating system, the different performances can be seen in the Appendix B table [22]. Using this value, the final energy consumption has been evaluated. The transition from final to primary energy has been made using a factor of 1.01 kWhp.e./kWhf.e. This value is the one reported for Spain in [23]. For the reference cooling system, the procedure is analogous, the energy source is electricity, and its average efficiency or seasonal energy efficiency ratio is shown in Appendix B; the transfer factor from final to primary energy is 2.61 kWhp.e./kWhf.e. The thermal systems have not been considered for the renovation since EVha manages public housing stock where passive measures for improving the building envelope are prioritized to active measures [6,7]. Therefore, further energy savings could be obtained if they are considered in the renovation. After selecting the mentioned parameters to obtain POS1 in the tool, the representative global values for each solution are summarized in Table 8.  
The energy needs of the building in its initial situation are the following:  
Heating energy needs: 44.22 kWh/m\({}^{2}\). Cooling energy needs: 21.28 kWh/m\({}^{2}\). DHW energy needs: 16.23 kWh/m\({}^{2}\), they are not relevant for the identification of the optimal as the renovation measures does not concern this energy need. The primary energy consumption (current situation) is 99.78 (kW/h m\({}^{2}\)). The final energy consumption (current situation) is 72.33 (kWh/m\({}^{2}\)). The CO\({}_{2}\) emissions in its initial situation are 19.49 kg/m\({}^{2}\). Figure 5: POS1 Scenario. Once the solutions that provided the higher energy savings for each of the POS were selected, the results were applied to the whole building stock. To do so, it was necessary to obtain the useful area for each group of buildings that were characterised as explained in Section 3 per type of reference building, orientation and reference climate.