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    Sorption–desorption characteristics of dried cow dung with PVP and clay as composite desiccants: Experimental and exergetic analysis
    (Elsevier Ltd, 2023) Dasar, S.R.; Boche, A.M.; Yadav, A.K.; Anish, S.
    The present study investigates the sorption and desorption characteristics of a natural composite desiccant based on dried cow dung (DCD). Polyvinyl Pyrrolidone (PVP) and clay are used as binders with DCD. The moisture uptake capacity of composite desiccants is measured with an isotherm experiment under different DCD to binder ratios. Based on their isotherms, composite desiccants are chosen for characteristic study under different humid conditions and validated with available literature data. Brunauer–Emmett–Teller (BET) and Barrett–Joyner–Halenda (BJH) analyses are carried out to understand the physical properties of DCD, DCD+PVP (3:1) and DCD+Clay (3:1). Total heat load reduction, exergy efficiency and power required for these dehumidification systems are calculated for different inlet conditions. Desorption characteristics are tested at 328 K and 6% RH. Results show the maximum moisture uptake capacity of DCD and DCD+PVP as 14.42 and 14.72 g/100 g, respectively. The maximum exergy efficiency of the DCD+PVP dehumidification system is found to be 55%. Desorption time for DCD+PVP desiccant is 17 min, which is 4 and 2 min higher compared to DCD, and DCD+Clay, respectively. With this experimental study, it is concluded that the DCD+PVP has the potential to become an alternative to chemical desiccants based on their exergy efficiency and moisture uptake capacity. © 2022 Elsevier Ltd
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    Experimental analysis of dehumidification system with natural composite desiccant coating on staggered hexagonal aluminium channels
    (Elsevier B.V., 2025) Dasar, S.R.; Bharti, N.K.; Sah, S.K.; Anish, S.; Yadav, A.K.
    This study aimed to develop an eco-friendly natural composite desiccant (NCD) for building cooling. NCD is a mixture of dried cow dung (DCD) and polyvinyl pyrrolidone (PVP) for use in a dehumidification bed with staggered hexagonal aluminium channels (SHACs). The natural composite desiccant was prepared by coating the mixture onto the channels with a 2:1 ratio of DCD:PVP. The maximum moisture uptake (MUC) and moisture uptake rate of the NCD was tested under different relative humidities (RH) and temperatures, and regeneration of NCDs was performed to maintain optimal performance. The results of the study showed that the NCD-coated SHACs dehumidification system had a high uptake capacity, with MUC values ranging from 8.34 to 14.31 g/100 g at different RH and temperature conditions. The system also showed an average uptake capacity rate of 0.26 g/100 g?min and a desorption rate of 0.51 g/100 g?min. Furthermore, the moisture flow design of the NCD-coated SHACs bed resulted in a low-pressure drop of 0.13 kPa, which was significantly lower than the NCD-packed bed. The study also calculated total heat load reduction at different inlet conditions. Eco-friendly dehumidification offers significant environmental benefits, and promising sustainable solutions. © 2024 Elsevier B.V.