## 2 Materials and Methods  
The city used for the simulation is Curitiba, with a climate classification, Cfa, according to [PERSON] subtropical, in the coldest month the average air temperature is 18 \({}^{\circ}\)C, and in the hottest month, the average air temperature is above 22 \({}^{\circ}\)C [12]. Table 1 shows the climate data for Curitiba, Brazil, while Table 2 shows the average values of conditions measured indoors. \begin{table}
\begin{tabular}{l c} \hline \hline
**Parameter** & **Value** \\ \hline City & Curitiba \\ Altitude (m) & 906 \\ Summer—Coinciding Wet Bulb Temperature & 23.2 \\ (\({}^{\circ}\)C) & Winter—Dry Bulb Temperature (\({}^{\circ}\)C) & 8.8 \\ Summer—Dry Bulb Temperature (\({}^{\circ}\)C) & 31 \\ \hline \hline \end{tabular}
\end{table} 
Table 1: Climate data for Curitiba [13]. \begin{table}
\begin{tabular}{l c} \hline \hline
**Parameter** & **Value** \\ \hline Standard Option & ASHRAE 62.1 \\ Indoor Relative Humidity & 40\% a 60\% \\ Humidity Control & Yes \\ Internal Dry Bulb Temperature (\({}^{\circ}\)C) & 28 \({}^{\circ}\)C (\(\pm\)2 \({}^{\circ}\)C) \\ \hline \hline \end{tabular}
\end{table} 
Table 2: Indoor data for Curitiba [14; 15; 16]. In an indoor pool environment, the water temperatures are measured. The air temperature is set to be from 0 to 4 K or higher than the water temperature. Still, the relative humidity of the air must be from 40% to 80%, a value below 60% serves as a reference, and for the airspeed, the reference value would be equal to or less than 0.10 m/s in the proximity to users. [17]. The quality of the air can be altered due to the high humidity, allowing the growth of fungi, bacteria, and viruses in this environment. Keeping the relative humidity between 50% and 60% will reduce the number and activity of these organisms [18]. High humidity values are what affect comfort, productivity and human health the most, so ASHRAE [19] proposed a table of growth of bacteria, viruses, fungi, mites and other situations derived from pathogens according to relative humidity. Figure 1 shows the importance of maintaining relative humidity control in indoor swimming pools. Values outside of the green bar (optimal zone) indicates a decrease in effect. There is evidence on how particular ranges of humidity may act to decrease the amount of infectious disease particles [20]. Using ASHRAE 62.1, assuming 4 to 6 changes per hour, airflow is calculated for the entirety covered pool area. This pool is located in the city of Curitiba and has a volume of 600 m\({}^{3}\); the necessary airflow as shown in Equation (1) [15]. \[\text{Air Flow}:600\text{ m}^{3}\times 4\ \frac{air\ changes}{hour}=2400\text{ m}^{3}/\text{h} \tag{1}\]  
Air renewal was used in this environment. An exhaust fan is used to ensure air renovation. For a comfortable temperature to be guaranteed for people, this equipment utilizes external air as an input for temperature control. Controlling the humidity of the pool enclosure is required to reduce and/or eliminate condensation on the walls and glass surfaces. The reference environmental conditions should be a dew point of 19.1 \({}^{\circ}\)C; relative humidity of 60%; and an internal temperature of 28 \({}^{\circ}\)C (ASHRAE Psychometric Chart application). Condensation will occur if the outside air temperature is below the 12 \({}^{\circ}\)C dew point while there is a relative humidity of 40%. This difference of 20% in relative humidity represents a condensation problem in 60% to 12.5% of hours annually. According to Figure 2, in the 60% relative indoor humidity condition the outdoor air is a major problem for condensation on the walls of the closed pool environment in 60% of the annual hours. At a relative humidity of 40%, the outside air would promote air condensation in the indoor pool in only 12.5% of the annual hours. Figure 1: Importance of maintaining control of relative humidity in indoor swimming pools (Adapted from [19]).