دانلود رایگان مقاله ارزیابی عملکرد بسته بندی گاز پانسمان برای سیستم رطوبت خشک کن مایع

Abstract

Desiccant systems have found applications in a very large variety of industrial and daily usage products including the new HVAC installations. The dehumidifier is one of the essential parts of those systems, which severely affects the whole system performance. This paper theoretically and experimentally studies the performance of the cross flow dehumidifier, which has been less studied than the counter flow dehumidifier, although it is more applicable in practice. Channel gauze structured packing was used in the dehumidifier and a LiCl aqueous solution was used as the liquid desiccant. The humidity reduction and dehumidifier effectiveness were adopted as the dehumidifier performance indices. The effects of the dehumidifier inlet parameters, including inlet air and desiccant flow rates, inlet air and desiccant temperature, inlet desiccant concentration and inlet air humidity ratio, on the two indices were investigated. The characteristics of the dehumidifier performance agreed well with the other studies reported in the open literature.

6. Conclusion

This paper theoretically and experimentally studies the mass transfer process between the air and the desiccant when they cross flow through channel gauze structured packing dehumidifier. Humidity reduction and dehumidifier effectiveness were used as the performance indices of the mass transfer process. Generally, inlet parameters have the same trends in affecting the performance of the present dehumidifier and the experimental results reported in the literature. The main conclusions that can be derived from this study can be summarized as follows: 1. In experimental investigation, it was found that the performance parameters did not show any dependency on the liquid flow rate when liquid to air flow rate ratios (ms,i/ma,i) is equal or greater than 2.0. The effect of the specific area of packing per volume on the humidity reduction is extremely high while its effect on the pressure drop is affected slightly. 2. Increasing the length of packing from 0.5 m to 1.0 m enhanced the humidity reduction and dehumidifier effectiveness about 1.33 times. 3. Using structured packing arranged as straight sheets produced significantly low pressure drop compared to the experimental pressure drop of selected dehumidifiers from the literature, in turn, more energy saving in air stream.