## 3 Computational Methodology
### Energy Efficiency Proposal Using Passive and Active Technologies
\begin{table}
\begin{tabular}{c c c c c c c c c} \hline  & & \multicolumn{6}{c}{**Passive Thermal Restoration Technologies**} \\ \hline
**Proposed Envelope** & **U-Value** & **Width** & **Conductivity** & **Specific Heat** & **Baseline (\%)** & **Annual** & **Unitary Price \({}^{\star}\)** & **Ref.** \\
**Material** & **(W/(m\({}^{2}\)K)** & **(m)** & **(W/(m-K))** & **(J/(kg-K))** & **Reflectance (\%)** & **Maintenance** & **(MON/(m\({}^{2}\))** & **Ref.** \\ \hline White reflective coating & 1.278 & 0.025 & 0.40 & 780 & 90 & - & 160 & [35] \\ Expanded polystyrene & 1.760 & 0.050 & 0.04 & 1400 & - & - & 469 & [31] \\ Green roof & 1.161 & 0.200 & 0.30 & 1000 & 25 \({}^{\rm b}\) & 1200 MON & 550 & [36] \\ \hline \multicolumn{6}{c}{**Active thermal restoration technologies**} \\ \hline
**Building zone** & **TOR \({}^{\star}\)** & **A/C Power** & **Average** & **Average** & **Average** & **Electtical device cost** & **Maintenance cost** \\
**(MON/(m\({}^{2}\)M))** & **(M/month)** & **TOR \({}^{\star}\)** & **A/C Power (W/mooth)** & **A/C Power (MON)** & **A/C Power (MON/year)** & **A/C Power (MON/year)** \\ \cline{2-8} \multicolumn{6}{c}{Current conditions} & \multicolumn{6}{c}{Technological replacement} \\ \hline Ophthalmological office & 1.0 & 1.22 & 839 & 1.5 & 1.7 & 774 & 7500.00 & 1400.00 \\ Eye care & 1.0 & 1.28 & 882 & 1.5 & 1.71 & 779 & 7500.00 & 1400.00 \\ Patient recovery & 1.0 & 1.24 & 246 & 1.0 & 1.18 & 155 & 6000.00 & 1400.00 \\ Surgery room & 2.0 & 2.52 & 501 & 2.0 & 2.4 & 315 & 9900.00 & 1400.00 \\ Surgery office & 1.0 & 1.22 & 242 & 1.5 & 1.72 & 226 & 7500.00 & 1400.00 \\ Waiting room & 1.0 & 1.22 & 242 & 1.0 & 1.16 & 152 & 6000.00 & 1400.00 \\ \hline \end{tabular}  
* Including installation cost.\({}^{\star}\) Considering a 1.0 \(\rm{M}\) of 3.75, emissivity of 0.9, and a stomatal resistance of 175. \({}^{\star}\) TOR: Tons of refrigeration.  
\end{table} 
Table 4: Passive and active strategies used to improve building energy efficiency and achieve thermal restaratum. The passive and active technologies were assessed systematically, dividing them into lots containing the thermal restoration scenarios. Lot A comprises restoration scenarios with passive modifications to the roof (insulating material, reflective coating, and green roof) or reflective paint on the walls. Lot B includes passive changes in the roof combined with efficient air conditioning systems (inverters). Finally, in Lot C, the reflective coating on the walls is added to the active and passive modifications. Table 5 enlists the 15 thermal restoration scenarios, whereas Figure 7 depicts the layer distribution of material of the 5 essential changes in the envelope from which the scenarios are derived. In the green roof, simulation is important considerer the irrigation process [37]; however, energy plus software does not have enough information to model that process. To consider the effect of irrigation, the model contemplates a scheduled irrigation once a month with an irrigation rate of 0.3 m/h, according to similar studies [36]. Figure 7: Description of passive modifications implemented in the envelope of the medical center: (**a**) roof with polyurethane insulation; (**b**) roof with reflective coating (This is the same material implemented in the case of the walls); (**c**) roof with polyurethane insulation and reflective coatings; (**d**) green roof.