Dehumidification behavior of an aluminophosphate zeolite coated crossflow heat exchanger driven with direct hot water heating and evaporative cooling

Sunhor, Seng; Saputra, Dendi Adi; Osaka, Yugo; Tsujiguchi, Takuya; Kodama, Akio

doi:10.1016/j.applthermaleng.2022.118355

Cited by 10 publications

(1 citation statement)

References 28 publications

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“…Recently, many studies have been focused on the development of a desiccantcoated heat exchanger (DCHE) to improve dehumidification performance by employing various desiccant materials and heat exchangers. Sunhor et al [6] investigated experimentally the dehumidification behavior of AlPO-zeolite-coated heat exchanger by varying operating conditions. Chai et al [7] presented a desiccant heat pump by combining a heat pump and a desiccant-coated heat exchanger.…”

Section: Introductionmentioning

confidence: 99%

Heat and Mass Transfer of a Decoupling Cooling System: A Desiccant-Coated Heat Exchanger and a Dew-Point Evaporative Cooler

Oh¹,

Kim²,

Yang³

et al. 2023

Heat Transfer - Fundamentals, Enhancement and Applications

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This study presents an innovative de-coupling cooling technology where latent and sensible cooling loads are handled separately by a desiccant-coated heat exchanger (DCHE)-based dehumidifier and a dew-point evaporative cooler (DEC). The DCHE first removes the moisture of humid outdoor air by adsorption process. Subsequently, the DEC sensibly cools down the dehumidified air, maintaining the humidity ratio. Their performances are investigated numerically by analyzing the heat and mass transfer. The cyclic average outlet values of DCHE are applied to the inlet conditions for DEC simulation. Comparison between the simulation results and the experimental data was carried out and showed good agreement and a similar trend with a maximum discrepancy of 8.6% for DCHE and 3.2% for DEC, respectively. Key results revealed that moisture removal capacity (MRC) and latent cooling capacity (QL) for DCHE are largely affected by varying air dry-bulb and air wet-bulb temperatures, while the almost constant COPth was observed regardless of the variation of temperatures. For the DEC, the higher dew-point effectiveness and wet-bulb effectiveness were observed at the higher dry-bulb temperature and higher humidity ratio, while the higher sensible cooling capacity was observed at the higher dry-bulb temperature and lower humidity ratio.

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Section: Introductionmentioning

confidence: 99%

Heat and Mass Transfer of a Decoupling Cooling System: A Desiccant-Coated Heat Exchanger and a Dew-Point Evaporative Cooler

Oh¹,

Kim²,

Yang³

et al. 2023

Heat Transfer - Fundamentals, Enhancement and Applications

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Preparation of high specific surface area activated carbon fiber by high-temperature vacuum activation and its superior water vapor adsorption for air humidity control

Chen

et al. 2023

J Mater Sci

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Performance evaluation of an indirect–direct evaporative cooler using aluminum oxide-based nanofluid

Ganesha,

Kumar,

Kumar

et al. 2023

J Therm Anal Calorim

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Indoor comfort has become a necessity in recent times with the advancement of science and technology. The usage of direct type air coolers increases the humidity of the closed room, and this increase in humidity is unfavorable. The present work deals with the study related to the combination of direct and indirect type air cooler to increase the performance. A set of mild steel plates have been arranged to form a cross flow heat exchanger to exchange the heat between cold nanofluid and warm air forms the indirect heat exchanger. Al2O3-based nanoparticles have been blended with pure water and used in indirect air coolers. Celdek pad 7090 is used as the cooling pad in the direct type of air cooling. Experiments are performed by varying the flow rates of water from 1 to 4 lpm, by varying the air velocities from 3 to 6 ms−1, and by varying the concentration of nanoparticles in the water from 0 to 0.2.5%. Performance parameters such as change in temperature, change in Relative humidity (RH), cooling efficiency and coefficient of performance (COP) are determined. It was found that by adding the nanoparticles, the performance of the cooler has been enhanced. Chane in dry bulb temperature (ΔDBT), cooling efficiency increased by 13.1%, 14% as compared to the indirect method without using the nanoparticles and 39.2% and 21% as compared to the only direct type. Similarly, ΔRH reduced by 27% when compared to only direct evaporative cooler. 3 LPM showed the best performance with the highest humidification efficiency and COP of 96% and 5.9, respectively. When the air velocity is increased from 3 to 6 ms−1, energy consumption increases by 49%. Combination of indirect–direct techniques with the use of nanofluid has shown the potential of greater reduction in the exit DBT with simultaneously without appreciably increasing the exit RH.

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Dehumidification behavior of an aluminophosphate zeolite coated crossflow heat exchanger driven with direct hot water heating and evaporative cooling

Cited by 10 publications

References 28 publications

Heat and Mass Transfer of a Decoupling Cooling System: A Desiccant-Coated Heat Exchanger and a Dew-Point Evaporative Cooler

Heat and Mass Transfer of a Decoupling Cooling System: A Desiccant-Coated Heat Exchanger and a Dew-Point Evaporative Cooler

Preparation of high specific surface area activated carbon fiber by high-temperature vacuum activation and its superior water vapor adsorption for air humidity control

Performance evaluation of an indirect–direct evaporative cooler using aluminum oxide-based nanofluid

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