Water vapor sorption kinetics of polymer based sorbents: Theory and experiments

Sultan, Muhammad; El-Sharkawy, Ibrahim I.; Miyazaki, Takahiko; Saha, Bidyut Baran; Koyama, Shigeru; Maruyama, Tomohiro; Maeda, Siro; Nakamura, Takashi

doi:10.1016/j.applthermaleng.2016.05.192

Cited by 72 publications

(46 citation statements)

References 32 publications

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“…Figure 7a shows the difference between ambient air temperature and relative humidity with the product air temperature and relative humidity. It is clear from the figure that the product air temperature is lower than ambient air temperature due to water evaporation [30,[33][34][35]. However, relative humidity of product air is higher than ambient air relative humidity which is required for animal air-conditioning.…”

Section: M-cycle Assisted Desiccant Air-conditioning (M-dac) Systemmentioning

confidence: 99%

Investigation of Desiccant and Evaporative Cooling Systems for Animal Air-Conditioning

Sultan¹,

Niaz²,

Miyazaki³

2020

Low-Temperature Technologies

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Productivity of livestock animals particularly sheep, goats, dairy, and beef cattle are usually affected due to high thermal/heat (sensible and latent) stresses, particularly in the developing countries. Different types of heating, ventilation, and airconditioning (HVAC) systems are used worldwide depending upon the ambient air conditions to achieve the animals' thermal comfort. In this chapter, few low-cost options for the airconditioning system and for farm building designs are discussed. Desiccant-based two airconditioning systems are considered i.e., standalone desiccant airconditioning (D-AC) and M-cycle assisted D-AC (M-DAC) system. The feasibility of both systems is thermodynamically checked for climatic conditions of Multan, Pakistan. Daily-basis data of ambient and processed air from both systems are analyzed for the thermal comfort of Holstein Friesian cows. Temperature humidity index (THI) is calculated to investigate the thermal heat stress conditions. Results showed that the D-AC system can be used efficiently in the humid climatic conditions with relatively moderate-to-low temperatures. On the other hand, the M-DAC system can be used in humid climatic conditions with relatively high-temperature conditions. It is important to mention that the typical direct evaporative cooling systems can be obviously low-cost options in case of dry climatic conditions.

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Section: M-cycle Assisted Desiccant Air-conditioning (M-dac) Systemmentioning

confidence: 99%

Investigation of Desiccant and Evaporative Cooling Systems for Animal Air-Conditioning

Sultan¹,

Niaz²,

Miyazaki³

2020

Low-Temperature Technologies

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“…This behavior was caused by the water-vapor sorption kinetics properties of the polymer adsorbent. At high desorption temperature, the water vapor sorption kinetics is high [40], leading to a decrease in the time required for the desorption phase. It implies that the desorption rate at a high temperature is faster, as compared to the low temperature.…”

Section: Influence Of Desorption Temperature On the Water Content Remmentioning

confidence: 99%

Influence of Phase Change Phenomena on the Performance of a Desiccant Dehumidification System

et al. 2020

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Demands of standalone dehumidification systems have been increasing in order to realize energy savings in air-conditioning processes. In a desiccant dehumidification system, the water vapor from the moist air undergoes a phase change phenomenon, this being from vapor to adsorbed phase, a process analogous to latent heat exchange. The energy exchange involved in such a process is often significant—up to 80% of the total energy exchange. In this study, the influence of the phase change phenomena involved in a desiccant dehumidification system was evaluated experimentally, along with the performance investigation under low desorption air temperatures of 308, 318, 328, 338, and 345 K. The system was driven by a constant adsorption temperature of 293 K. The dehumidification ability, latent heat ratio, and latent effectiveness were employed as key performance indexes. The results showed that with the increased desorption temperature, the latent heat ratio decreased, whereas the dehumidification ability and latent effectiveness increased. The highest latent heat ratio was found to be 0.61 at the desorption temperature of 308 K, whereas the highest latent effectiveness was obtained at the desorption temperature of 345 K. A suitable temperature for the effective and efficient dehumidification was observed to be 318 K for the current system.

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“…Therefore, the DDS can also play a role to reduce the drying time by providing fast adsorption rate process. In this regard, many studies on desiccant materials have been reported for total moisture adsorption equilibrium [38,39] and moisture adsorption rate [40,41] . Similarly, different parameters of desiccant based drying system are optimized for energy minimization, e.g.…”

Section: Introduction mentioning

confidence: 99%

Investigation of energy-efficient solid desiccant system for wheat drying

Hanif

Sultan

Miyazaki³

et al. 2019

International Journal of Agricultural and Biological Engineering

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The study investigates the applicability of solid desiccant system for drying of freshly harvested wheat grains in order to reduce the moisture content to an optimum level. Fast and low-temperature drying systems are required by today's drying industries in order to provide economical and safe drying. Therefore, comparison of desiccant drying has been made with the conventional method in terms of drying kinetics, allowable time for safe storage, the total time for drying cycle, and overall energy consumption. It has been found that the air conditions of proposed desiccant drying system provides a high drying rate and longer allowable storage time for safe drying. As the desiccants possess water adsorbing ability by means of vapor pressure deficit, therefore, the desiccant system successfully provides low-temperature drying which ensures the quality of wheat grains. Overall energy consumption is estimated for both conventional hot air drying and desiccant drying system. It has been found that the desiccant system requires less energy as drying is accomplished at minimum level of air flow and within allowable storage time.In addition, the overall performance index of the desiccant system is higher at all temperatures. The study is useful for developing a low-cost and sustainable drying technology for various agricultural products.

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Water vapor sorption kinetics of polymer based sorbents: Theory and experiments

Cited by 72 publications

References 32 publications

Investigation of Desiccant and Evaporative Cooling Systems for Animal Air-Conditioning

Investigation of Desiccant and Evaporative Cooling Systems for Animal Air-Conditioning

Influence of Phase Change Phenomena on the Performance of a Desiccant Dehumidification System

Investigation of energy-efficient solid desiccant system for wheat drying

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