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Clean Environment
heated and, finally, exhausted outside.
An analytical model was used to analyze the performance of R-IEC (Hasan, 2012). The size of this exchanger was: total length 0.86 m, total depth 1.1 m, total width 0.46 m, channel height 3 mm, channel width 45.8 mm and number of channels 320. The supply air volumetric flow rate was
1530 m3/h, and the secondary to intake air ratio was 0.44. A typical summer air conditions in Cordoba were selected: dry bulb temperature 37.78 oC and air humidity ratio 9.05 g/kg.
3. Results and conclusions
The air conditions of primary and secondary airflows are shown in Figure 1. It can be observed than the primary outlet air temperature was 21.5 oC, i.e. a temperature reduction of 16.28 oC. These results also showed that the cooling capacity was 8303 W, the fan power consumption was 394 W and the coefficient of performance, COP, was 21.
Figure 1. Psychrometric chart. Primary and secondary air processes.
In conclusion, these results suggested that R-IEC can be considered as a very low energy consumption HVAC system to cool air in hot and dry air conditions, such as in South European climatic conditions. Moreover, these systems would contribute to achieving the European objectives of NZEB.
4. References
Duan, Z., Zhan, C., Zhang, X., Mustafa, M., Zhao, X., Alimohammadisagvand, B., Hasan, A., 2012. Indirect evaporative cooling: Past, present and future potentials. Renew. Sustain. Energy Rev. 16, 6823–6850.
Hasan, A., 2012. Going below the wet-bulb temperature by indirect evaporative cooling: Analysis using a modified ε-NTU method. Appl. Energy 89, 237–245.
Porumb, B., Ungureşan, P., Tutunaru, L.F., Şerban, A., Bálan, M., 2016. A Review of Indirect Evaporative Cooling Technology. Energy Procedia 85, 461–471.
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