## 5 Integrated Machine: Description, Plant Linking and Behaviour Analyses  
### Integrated Machine Description  
The machine is the same used in the test described in ref. [21]. That research analysed data coming from a test carried out between 2018 and 2019. In such a period, the machine was moved from the worker village of Dubai to a desert area of United Emirates, and it was used only to produce water to be bottled. The said research goal was focused on the water quality and water from air bottling economic effectiveness in comparison to traditional bottled water. The results are very interesting as they report that the produced water quality is comparable to that of the main bottle labels sold in the UAE. Thus, such a water quality is also assumed in this study. \begin{table}
\begin{tabular}{c c c c c c c c c c c c} \hline \hline
**Average** & **January** & **February** & **March** & **April** & **May** & **June** & **July** & **August** & **September** & **October** & **November** & **December** \\ \hline
**t** (\({}^{\circ}\)**C) & 20.6 & 21.7 & 24.4 & 28.5 & 32.8 & 34.2 & 37.0 & 36.8 & 34.4 & 31.2 & 26.5 & 22.3 \\ \hline
**R. H.** & 59.7 & 56.5 & 53.2 & 46.6 & 39.5 & 48.8 & 44.6 & 44.6 & 51.5 & 54.4 & 53.7 & 57.4 \\ (\%) & & & & & & & & & & & & \\ \hline \hline \end{tabular}
\end{table} 
Table 1: Dubai climate, expressed in monthly averages. The current research is based on the data coming from the test outputs of December 2017. In that period, as said before, the integrated machine was placed in the industrial side of Dubai in a worker village. It is worth mentioning that, for water extraction from air, the worst period in Dubai is from December to March, as it was underlined also in in ref. [47]. The machine was connected to the existing heating and cooling plants of the village kitchens in order to test the integration potentialities, intended to enhance the energy efficiency of the existing plants while producing high-quality water. The machine used in the worker village has the same features of that used for the test in Mexico [20]. The system is based on a thermodynamic reverse cycle, where the circulating coolant is R134a. The major items of the machine are described below:  
* Air filters placed in the inlet section. The air coming from the environment is cleaned by means of a filtration stage composed by two filter arrays in series: the first composed by coarse filters followed by pocket filters in order to avoid pollution due to dust, sand, insects, bacteria and other particles. * Evaporation and heat recovery coils. The cooling process is carried out by means of direct cooling on an evaporation coil combined with a heat recovery system. Both of them are made of food contact materials [48]. The airflow, after the cooling process, can be collected in a duct in order to be delivered to zones requiring cooled and dry air changes. * Evaporation fans. The machine has centrifugal evaporation fans that can provide an average airflow, in Dubai conditions, of 10,000 m\({}^{3}\)/h. * Screw Compressor. The compressor running the thermodynamic reverse cycle is a screw compressor having, in Dubai environmental conditions, an average cooling and heating capacity, respectively, of 81 kW and 105 kW. The coolant is R134a. * Condensation coils. The machine is equipped by two kinds of condenser: a finned air-cooled coil and a plate heat exchanger. The condensation heat is delivered to the domestic water by means of this second condenser, where the water flow is run by a pump, regulated by the setting temperature. When heating is not required, the condensation is provided by the finned coil, cooled by the environmental air. The plate heat exchanger works with a classic temperature difference of 5 \({}^{\circ}\)C. The domestic water heating was set to obtain a temperature difference of 40 \({}^{\circ}\)C and a maximum temperature of 50 \({}^{\circ}\)C.
* Water treatment unit. The condensate coming from the evaporator is collected in a tank in stainless steel.