Experimental study on heat and mass transfer of a multi-stage planar dehumidifier

Li, Chun-Han; Chen, Chen-Yu; Yang, Tsung Hsun; Li, Wen-Ken; Yan, Wei‐Mon

doi:10.1016/j.ijheatmasstransfer.2019.119104

Cited by 11 publications

(2 citation statements)

References 47 publications

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“…The total required energy was the amount of energy consumed for heating, decreasing Relative Humidity, fans, and other electricity needs (Li et al, 2020) The efficiency of the dehumidifier drying machine was calculated by the following formula (Singh, 2003) The calculation of moisture content using the formula (Charmongkolpradit et al, 2021)…”

Section: Performance Testmentioning

confidence: 99%

Dehumidifier Drying of Seagrass Simplicia at Low Temperature for Antioxidant and Phenolic Preservation

Susilo

Filayati

Hermanto

et al. 2023

JTP

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Syringodium isoetifollium is seagrass a marine plant which is mostly found in Indonesian sea waters. Phenol is a kind of sensitive heat compound which will damage at high temperatures. This research aimed to study the effect of temperature using a dehumidified drying machine on the quantity of phenol content and testing of this antioxidant activity and the evaluation of drying characteristics of seagrasses such as decrease of moisture content, the distribution of temperature drying relative humidity, and energy consumption. In this research, the independent variaable were tempeartures (30 °C, 40 °C, and 50 °C) and the independent variable were the content of phenol and antioxidant activity of the seagrasses. The phenol content of each extract was measured with a microplate reader using a Follin-Ciocalteu reagent. The antioxidant activity was measured with the 1,1-diphenyl-2-picrylhydrazyl (DPPH) method. The result showed that the highest content of phenolic compounds (80.42766 ± 0.409a) and antioxidant activity (88.4185 ± 32.0709a) was found in the dehumidified dryer at a temperature of 40 °C. There were significant differences between temperatures of 30 °C and 50 °C. Dehumidifier drying at 30 °C, 40 °C, and 50 °C required 13 hours, 12 hours, and 7.5 hours to reach the final moisture content of seagrass 18-20% from the initial moisture content of 89.4% ± 0.04% (wb). The total phenol content and antioxidant activity with a temperature treatment of 40 °C dehumidifier drying machine showed the best results compared to temperatures of 30 °C, 50 °C, and oven at 40 °C. Based on the same temperature treatment, dehumidifier drying requires a faster time (12 hours) than oven drying (17 hours). The appropriate temperature and time of drying can produce the optimal total phenol and antioxidant activity.

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Section: Performance Testmentioning

confidence: 99%

Dehumidifier Drying of Seagrass Simplicia at Low Temperature for Antioxidant and Phenolic Preservation

Susilo

Filayati

Hermanto

et al. 2023

JTP

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“…Results indicated that dehumidification efficiency was mainly affected by air flow rate and solution flow rate, and the system gave a dehumidification efficiency of 80%. Li et al [18] performed an experimental study on a multistage planar membrane dehumidifier both counter and parallel flow arrangements. Nafion 212 membranes were used, and the inlet operating conditions were initially maintained at 27 C, then varied.…”

Section: Introductionmentioning

confidence: 99%

Influence of Desiccant Concentration and Temperature on Moisture Absorption Using a Multistage Dehumidifier

Tejero‐González

Salins

Reddy³

2023

36th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems (ECOS 20

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Moisture control is essential for appropriate indoor air quality, mainly in humid regions. Liquid desiccant dehumidification system is among the latest techniques used to minimize the humidity indoors and maintain thermal comfort, requiring less energy than dehumidification through conventional refrigeration. In the current work, a four-stage dehumidifier is constructed, which consists of a dynamic packing soaked in the solution containing the desiccant. The linear motion of packing is induced by a cam spring follower mechanism powered by a motor. Celdek 7090 is used as packing along with Calcium Chloride of different concentrations as desiccant. Experiments are conducted for varying air velocity, desiccant concentration, and inlet dry bulb temperature. Input parameters are noted and performance parameters such as coefficient of performance, moisture removal rate, dehumidification efficiency, and humidity and temperature drops are evaluated. Results indicate that an increase in the desiccant concentration yields larger dehumidification, though 40% desiccant concentration led to adverse effects on the system components and hindered the flow. Rise in the inlet temperature slightly raised the dehumidification. System gave maximum moisture removal rate, dehumidification efficiency, and coefficient of performance equal to 4.83 g/s, 72.74%, and 4.35 respectively. Results also showed that increasing air velocity reduced the dehumidification efficiency. Air quality check conducted on the exit air, it is found that air quality is good and meets ASHRAE standards.

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Experimental study on performance measurement of planar vacuum membrane dehumidifier with serpentine flow channel designs

Lin

Chang

et al. 2022

Alexandria Engineering Journal

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Experimental study on heat and mass transfer of a multi-stage planar dehumidifier

Cited by 11 publications

References 47 publications

Dehumidifier Drying of Seagrass Simplicia at Low Temperature for Antioxidant and Phenolic Preservation

Dehumidifier Drying of Seagrass Simplicia at Low Temperature for Antioxidant and Phenolic Preservation

Influence of Desiccant Concentration and Temperature on Moisture Absorption Using a Multistage Dehumidifier

Experimental study on performance measurement of planar vacuum membrane dehumidifier with serpentine flow channel designs

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