## 3 Materials and Methods
### Monitoring Equipment  
Both test cells were fully monitored to characterize the indoor thermal conditions and the energy profiling. Figure 4 presents the schematic location of the different sensors used into the test cells. Superficial temperature both in the envelope walls and openings (i.e., \begin{table}
\begin{tabular}{c c c c c} \hline \hline  & \begin{tabular}{c} **Total Applied** \\ **PCM Mass [kg]** \\ \end{tabular} & \begin{tabular}{c} **Mortar (Mixture)** \\ **Density [kg/m\({}^{3}\)]** \\ \end{tabular} & \
\begin{tabular}{c} **Phase Change** \\ **Temperatures \(\mathbb{I}^{4}\)**Cl** \\ \end{tabular} &
\begin{tabular}{c} **Latent Heat** \\ **[k]/kg]** \\ \end{tabular} \\ \hline \multirow{2}{*}{Microbial} & \multirow{2}{*}{10.4} & \multirow{2}{*}{1034} & Melting: 24.1 & Charge: 110 \\  & & Crystallization: 21.06 & Discharge: 110 \\ \hline \multirow{2}{*}{CrodaTherm} & \multirow{2}{*}{11.32} & \multirow{2}{*}{1322} & Melting: 28.55 & Charge: 183 \\  & & & Crystallization: 20.74 & Discharge: 179 \\ \hline \hline \end{tabular}
\end{table} 
Table 1: Thermo-physical properties of the two PCMs used into the applied mortars. Figure 3: Schematic diagram of the indoor coating solutions applied to the 2 test cells. (**a**) DEMO1; reference cell with only WEDI® panels (2) added to the base layer (1); (**b**) DEMO2; test cell with WEDI® panels (1) + PCM-based mortar layer (3) added to the base layer (1). Source: [19]. windows), heat flux values through the facades, and indoor temperatures were continuously recorded. The energy use of the space conditioning units was also monitored. Table 2 presents a summary list with all the monitored variables, for which data were recorded with a sampling rate of 5 min. \begin{table}
\begin{tabular}{c c} \hline \hline
**Variable** & **Units** \\ \hline Heat flux through the Northern facade & W/m\({}^{2}\) \\ Heat flux through the Southern facade & W/m\({}^{2}\) \\ Indoor room temperature & \({}^{\circ}\)C \\ Internal wall surface temperature at the Northern facade & \({}^{\circ}\)C \\ Internal wall surface temperature at the Southern facade & \({}^{\circ}\)C \\ External wall surface temperature at the Northern facade & \({}^{\circ}\)C \\ External wall surface temperature at the Southern facade & \({}^{\circ}\)C \\ Internal coating * surface temperature placed on the Northern facade & \({}^{\circ}\)C \\ Internal coating * surface temperature placed on the Southern facade & \({}^{\circ}\)C \\ Ceiling surface temperature & \({}^{\circ}\)C \\ Floor surface temperature & \({}^{\circ}\)C \\ Internal window surface temperature & \({}^{\circ}\)C \\ Electric current from total electricity & A \\ Electric current from air conditioning electricity & A \\ Total electricity & kWh \\ Air conditioning electricity & kWh \\ CO\({}_{2}\) concentration & ppm \\ Indoor room relative humidity & \% \\ \hline \hline \end{tabular}  
* coating: it hereby refers both to the WEDI®® insulation panels mounted into the reference test cell as well as to the PCM-based mortars incorporated into the panels placed at the target test cell.  
\end{table} 
Table 2: Summary list of the monitored variables (both at the reference and test constructions). Figure 4: Scheme of the location of the monitoring sensors into the test cells. (Both were equipped with the same number and type of sensors). In addition, the monitoring infrastructure was based on the standard Lonworks communication protocol. It was used for data storage and created a communication network between both cells. Each test cell was equipped with an electrical cabinet for monitoring purposes (see Figure 5). Apart from the thermomagnetic protections corresponding to each panel, the cabinets included the following equipment:  
* Head Equipment--iLON SmartServer: it acts as a central data logger as well as a communication gateway between Lonworks and TCP/IP. * Wattmeter for electrical energy use measurement.