# Analytical Investigation of a Novel System for Combined Dew Point Cooling and Water Recovery
## 3 Results
### Performance of the DPC-WR System under Different Climatic Conditions
\begin{table}
\begin{tabular}{c c c c c c c} \hline \hline
**Symbol** & **Climatic Zone** & **Latitude** & **Longitude** & \(\mathbf{t}\) & \(\mathbf{x}\) & **EUF** \\  & & & & \({}^{\circ}\mathbf{C}\) & **g/kg** & \\ \hline Af & Tropical rainforest & 1.37 N & 103.92 E & 33.2 & 18.9 & 0.90 \\ Am & Tropical monsoon & 25.82 N & 80.3 W & 32.7 & 17.3 & 0.94 \\ As & Tropical savanna, dry & 21.98 N & 159.34 W & 29.1 & 16.0 & 0.87 \\ Aw & Tropical savanna, wet & 10.60 N & 66.98 W & 33.1 & 21.3 & 0.89 \\ BWk & Hot semi-arid & 33.42 N & 36.52 E & 38.0 & 4.9 & 0.95 \\ BWh & Cold semi-arid & 30.10 N & 31.18 E & 36.9 & 9.8 & 0.89 \\ BSk & Hot deserts & 39.75 N & 104.87 W & 32.9 & 3.9 & 0.95 \\ BSh & Cold desert & 34.57 N & 32.97 E & 33.3 & 13.5 & 0.89 \\ Cfa & Humid subtropical & 34.57 S & 58.42 W & 29.8 & 14.7 & 0.93 \\ Cfb & Temperate oceanic & 51.52 N & 0.1 W & 26.2 & 9.0 & 0.88 \\ Cfc & Subpolar oceanic & 37.00 S & 174.80 E & 24.3 & 11.9 & 0.89 \\ Csa & Hot-summer & 38.52 N & 27.02 E & 35.2 & 10.2 & 0.95 \\  & Mediterranean & & & & & \\ Csb & Warm-summer & 33.97 S & 18.60 E & 29.2 & 9.4 & 0.94 \\  & Mediterranean & & & & & \\ Csc & Cool-summer & 29.92 S & 71.2 W & 21.3 & 9.8 & 0.90 \\  & Mediterranean & & & & & \\ Cwa & M-i\({}^{1}\), humid & & & & & \\  & subtropical & 28.58 N & 77.20 E & 40.7 & 10.1 & 0.91 \\ Cwb & Subtropical highland & 19.43 N & 99.13 W & 27.9 & 3.9 & 0.90 \\  & Hot-summer humid & & & & & \\  & continental & 19.43 N & 99.13 W & 32.5 & 10.4 & 0.89 \\  & Warm-summer humid & & & & & \\  & continental & 19.43 N & 99.13 W & 24.9 & 8.2 & 0.89 \\  & Dfc & Subarctic & 64.82 N & 147.86 W & 25.7 & 6.7 & 0.90 \\  & Extremely cold & 62.02 N & 129.72 E & 28.2 & 9.0 & 0.90 \\  & Subarctic & & & & & \\  & Hot, dry-summer & & & & & \\  & continental & 42.85 N & 74.53 E & 33.7 & 7.5 & 0.75 \\ Dsb & Warm, dry-summer & & & & & \\  & continental & & & & & \\ Dsc & Dry-summer subarctic & & & & & \\  & M-i\({}^{1}\), warm-summer & & & & & \\ Dwa & M-i\({}^{1}\), warm-summer & & & & & \\  & humid continental & & & & & \\ Dwb & M-i\({}^{1}\), subarctic & 52.27 N & 104.32 E & 26.8 & 8.7 & 0.89 \\  & M-i\({}^{1}\), extremely cold & & 53.47 N & 122.40 E & 28.5 & 9.5 & 0.87 \\  & subarctic & & & & & \\ \hline \hline \end{tabular} \({}^{\dagger}\)Mi–monsoon-influenced.  
\end{table} 
Table 3: Climatic parameters defined by design conditions by ASHRAE [26] and performance indicator energy utilization factor (EUF) calculated for different climate zones [25]. the other hand, the lowest COP is noted in tropical climatic zones, which are characterized by high air humidity ratio. It can therefore be stated that a low air humidity ratio, especially in combination with high air temperature, enhances the cooling effectiveness of the DPC-WR system. The performance indicator GOR of the DPC-WR system is calculated for different climatic conditions and presented in Figure 5. As in the case of COP, the high values of GOR, ranging from 354 to 1814, results from taking for GOR calculation only the electric power input to the fan to transport the air through the following stages of the DPC-WR system. Additionally, like COP, GOR is highest in semi-arid, hot desert, and subtropical climatic zones and lowest in tropical climatic zones. Therefore, it can be stated that low air humidity ratio and high air temperature enhance not only the cooling effectiveness but also the water recovery effectiveness of the DPC-WR. Moreover, it can be seen that GOR is greater than COP in all climatic zones. This means that more energy supplied to the system is used in the water recovery process (water evaporation and subsequent condensation) than in the cooling process. An increased share of energy used in the water recovery process is the basis of the DPC-WR system operation. Thanks to this, it is possible not only to cool the air as in a standard dew point cooling system, but also to produce such an amount of water that the DPC-WR system could be an alternative and competitive method for water recovery.