The continuously growing energy demands for space air conditioning and depletion of conventional energy resources at a fast rate have propagated the need for producing a new and wide range of renewable and sustainable energy technologies. Liquid desiccant dehumidification technologies are the most optimistic approach due to their lower regeneration temperature required, a higher coefficient of performance, and the ability to be used during night hours. The factors responsible for the limited application of these systems are desiccant leakage, corrosion to the fabricating material, and carryover of desiccant droplets with the process air. To overcome these issues, a new multi-channel flat plate liquid desiccant air conditioning system has been developed and experimentally investigated. The performance of the system has been analyzed for the dehumidification and regeneration process. Calcium chloride has been used as a desiccant material with 40% and 35% by wt. concentration. Three sets of velocities of process air have been utilized, i.e., 0.9, 0.7, 0.5 m/s to investigate the system performance. Performance parameters, such as dehumidification rate, regeneration rate, dehumidification, and regeneration effectiveness, have been investigated in the present study. The liquid desiccant dehumidification system investigated in the present study includes a flat plate energy exchanger for heat and mass transfer between ambient moist air and liquid desiccant solution. This system conveys a large interfacial surface area between liquid desiccant solution and process air. Experimental results indicate that, in the dehumidification process, the ambient moist air has been dehumidified and cooled by 5.90 g kg −1 and 1.4°C, respectively, and dehumidification effectiveness of 0.239 has been achieved for the air velocity of 5 m/s at 40% concentration of the desiccant solution. Regeneration rate and effectiveness have been observed to be 0.014 g s −1 and 0.323, respectively, for the air velocity of 5 m/s at 35% concentration. The work presented in this study demonstrates the feasibility of the novel multi-layer flat plat liquid desiccant concept and provide growth and development to the liquid desiccant technologies for space air conditioning. Certain issues regarding the mass imbalance in the dehumidification and regeneration processes have been identified to be considered as future scope.
There has been a limited application of liquid desiccant (LD) dehumidification systems in space air conditioning until now. The key elements responsible for this restricted implementation are leakage of desiccant solution, corrosion of components, and solution carryover along with the processed air to the space to be conditioned. To remove these problems, an evacuated tube solar heat collector‐driven multichannel liquid desiccant air conditioning system has been proposed and experimentally investigated. In this study, dehumidification and regeneration rate, their effectiveness, cooling effect of the dehumidifier, and indirect evaporative cooling unit have been analyzed. The results obtained indicate that the process air has been dehumidified and cooled by 6.32 g kg−1 and 5.26°C, respectively. The regeneration rate and effectiveness have been obtained to be 0.26 g s−1 and 0.31, respectively. In terms of the cooling effect, the system output of 0.703 and 0.130 kW has been obtained from the dehumidifier and indirect evaporative cooling unit of the system, respectively. The proposed system validates the possibility of the novel solar‐powered liquid desiccant air conditioning system concept and provides growth and development of the LD air conditioning technology for space air conditioning.
In this research paper, Taguchi method, an influential technique for the optimization of operational parameters, is used to analyse the dehumidification parameters for a flat plate liquid desiccant dehumidification system. An orthogonal array using analysis of variance (ANOVA) and signal to noise ratio (S/N) are applied to find the dehumidification parameters of a liquid desiccant dehumidification system (LDDS). Calcium chloride (CaCl2) is used as a liquid desiccant solution. In this study, desiccant flow rate, air velocity and desiccant solution concentration are kept as operating parameters to find out the optimal relative humidity for room comfort. Experimental findings have shown proficient agreement with this approach.
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