دانلود رایگان مقاله عملکرد پارچه برای کاربردهای سرمایش تبخیری غیرمستقیم

Abstract

Indirect evaporative cooling, by using water evaporation to absorb heat to lower the air temperature without adding moisture, is an extremely low energy and environmentally friendly cooling principle. The properties of the wet channel surface in an indirect evaporating cooler, i.e. its moisture wicking ability, diffusivity and evaporation ability, can greatly affect cooling efficiency and performance. Irregular fibres help to divert moisture and enlarge the wetted area, thus promoting evaporation. A range of fabrics (textiles) weaved from various fibres were experimentally tested and compared to Kraft paper, which has been conventionally used as a wet surface medium in evaporative coolers. It was found that most of the textile fabrics have superior properties in moisture wicking ability, diffusivity and evaporation ability. Compared with Kraft paper, the wicking ability of some fabrics was found to be 171%e182% higher, the diffusion ability 298%e396% higher and evaporation ability 77%e93% higher. A general assessment concerning both the moisture transfer and mechanical properties found that two of the fabrics were most suitable for indirective evaporative cooling applications.

5. Conclusions

Seven different samples including six cloth fabrics and one of Kraft paper were experimentally studied in relation to their performance for indirect evaporative cooling applications. Tests were carried out to investigate their wicking ability, wetted areas, diffusion rates and evaporation rates. The results of the cloth fabrics have been analysed and compared to that of conventionally used Kraft paper. It was found that four of the fabrics have superior properties in terms of moisture wicking ability, diffusivity and evaporation ability compared to that of conventionally used Kraft paper. Two of them have low immediate diffusion ability and were considered not suitable for evaporative cooling applications.