Investigation of heat and mass transfer in a gauze-type structured packing liquid desiccant dehumidifier

Abstract

SUMMARYIn this experimental investigation, a packed bed column suitable for 5-ton hybrid cooling system has been designed to study the absorption of water vapour from moist air by contact with aqueous solutions of calcium chloride. The packing material used in the study was two elements of the BXPEP structured packing and the height of the each element was 17 cm. This packed bed dehumidifier handles desiccant flow rates from 10 to 32 l/min. This paper presents results from a detailed experimental investigation of the heat and mass transfer between a liquid desiccant (calcium chloride) and air in a gauze-type structured packing dehumidifier. The effects of different independent variables such as air inlet absolute humidity, desiccant inlet temperature, flow rate and its concentration on the performance of the dehumidifier have been investigated.

Experimental study of internally cooled liquid desiccant dehumidification: Application in Hong Kong and intensive analysis of influencing factors

“…The same trend was reported by other researchers. According to previous literature, some of them simply pointed out that the reason was the different temperature rises of the solution [26]. However, it is discovered that the temperature rise of the outlet solution in the work is only a little bigger when the inlet air temperature is higher.…”

Experimental study of an aqueous desiccant mixture system: Air dehumidification and desiccant regeneration

“…In the present study, the overall concentration of the desiccant mixture is maintained at 40 wt%. The following weight per cent combinations of CaCl 2 and LiCl are used: (a) 40 wt% CaCl 2 ; (b) 8 wt% [26,27]. The experimental results for the simultaneous operation of the structured packing with a humidity ratio of 0.027 kg of water per kg of dry air.…”

A simulation model for the performance of a hybrid liquid desiccant system during cooling and dehumidification

“…The advantages and benefits of using liquid-sorbent equipment for air-conditioning applications have been reported by Gandhidasan et al (2002), Dai et al (2001), Mago and Goswami (2003), Brandemuehl and Kattar (1997), Collier et al (1990), Albers et al (1991), Griffiths (1989), Peng and Howell (1984), Jurinak et al (1984), and Fumo and Goswami (2002) among others. Desiccant simulation models have been developed by various researchers such as: Dai and Zhang (2004), Ghaddar et al (2003), and Gandhidasan (2002) among others.…”