Enhancement of Energy Efficiency and Food Product Quality Using Adsorption Dryer with Zeolite

Djaeni, Mohamad; Sasongko, Setia Budi; Boxtel, A.J.B. van

doi:10.14710/ijred.2.2.81-86

Cited by 5 publications

(5 citation statements)

References 15 publications

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“…Djaeni et al [14] proposed a new method to study the adsorption of zeolite molecular sieves. It consists of using the heat energy released via adsorption to improve the ambient air temperature, thus improving the overall energy efficiency and driving force of the drying process and effectively reducing the amount of energy consumed through dehumidification.…”

Section: Introductionmentioning

confidence: 99%

Study on Preparation and Properties of PNIPAm/PPy Hydrogel Hygroscopic Material for Solid Dehumidification System

et al. 2023

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Air-conditioning systems account for 40–60% of the energy consumption of buildings, and most of this figure corresponds to the cooling and dehumidification process of air-conditioning units. Compared with traditional compressed air-conditioning systems, solid adsorption dehumidification systems possess good potential to improve indoor air quality and reduce buildings’ energy consumption. However, there are still some problems that prevent the use of solid adsorption dehumidification systems, such as their complexity and high regeneration temperatures. The key to solving the above problem is the discovery of more suitable adsorbents. In this paper, poly N-isopropylacrylamide/polypyrrole (PNIPAm/PPy) hydrogel was selected as the research object, and the performance of the dehumidification material and its potential for application in solid dehumidification systems were studied. It was found that the pore structure of PNIPAm/PPy was relatively complex and that there were abundant pores with uneven pore sizes. The minimum pore size was about 4 μm, while the maximum pore size was about 25 μm, and the pore sizes were mostly distributed between 8 and 20 μm. Abundant and dense pores ensure good hygroscopic and water-releasing properties of the resulting hydrogel. The PPy inside the hydrogel acts as both a hygroscopic and photothermal agent. In an environment with a relative humidity of 90%, 60%, and 50%, the hygroscopic efficiency of PNIPAm/PPy reached 80% in about 75, 100, and 120 min, and the corresponding unit equilibrium hygroscopic capacity values were 3.85 g/g, 3.72 g/g, and 3.71 g/g, respectively. In the initial stage, the moisture absorption increased with the increase in time; then, the increase in moisture absorption decreased. When the temperature was below 40 °C, the hygroscopic performance of PNIPAm/PPy was almost temperature-independent. The PNIPAm/PPy with different thicknesses showed similar moisture absorption efficiency. The lowest desorption temperature of PNIPAm/PPy was 40 °C, which indicates that low-grade energy can be used for material desorption. And the higher the temperature, the faster the desorption rate of PNIPAm/PPy and the higher the desorption amount. It can be seen that the PNIPAm/PPy hydrogel presents good desorption performance and can be used repeatedly.

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Section: Introductionmentioning

confidence: 99%

Study on Preparation and Properties of PNIPAm/PPy Hydrogel Hygroscopic Material for Solid Dehumidification System

et al. 2023

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“…Artisanal farmers currently use direct sunlight to dry the harvested seaweed because it is easy and inexpensive (Hakim, Handoyo & Prasetya, 2019). However, the direct sunlight drying method is weather-dependent, time-consuming and insanitary (Djaeni, Sasongko, & Van Boxtel, 2013). Many studies have been conducted to deal with these complications.…”

Section: Introductionmentioning

confidence: 99%

Design and Performance of Scaled-Up Microwave Dryer for Seaweed Drying

Hakim

Handoyo

Prasetya

2020

Squalen Bull. Marine Fisheries Postharvest Biotech.

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Direct sunlight is commonly used to dry fresh seaweed by artisanal farmers in Indonesia due to its low cost and ease of handling. Nevertheless, this method poses some drawbacks such as lengthy duration, weather dependency and quality degradation. The application of microwave technology in food processing has progressed dramatically, including in the drying process. The microwave drying method is more efficient and can shorten the processing time. This study aimed to describe a large-scale microwave dryer (MD) design and performance to assist the fresh seaweed drying process. The design concept applies microwave energy with a volumetric heating feature to accelerate the seaweed drying process without damaging its functional groups. The MD dimensions were 2410 (l) x 270 (w) x 210 (h) mm with a dryer capacity of up to six kilograms, an enlarged cavity and multiple magnetrons. The main components of the MD were cavity, air circulation system, drying system and control system. According to the performance testing, the MD’s optimum performance was at a power level setting of P7 and six kilograms load. At this setting, we obtained a dried seaweed with a moisture ratio of 0.68±0.05, drying rate of 30.29±1.32 g/min, specific energy consumption of 3.96±0.08 MJ/kg H2O and energy efficiency of 58.45±2.65%. The total power of the P7 setting operation required 2.00 kW. Fourier-Transform Infrared (FTIR) spectra showed that the functional groups of the dried seaweed were unaltered.

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“…This process requires about 70% of total energy in post harvest treatment (Kudra, 2004;Djaeni et al, 2013a;Gilmour et al, 2004). In addition, most of industrial drying used the fossil fuel as energy source that was still in-efficient for energy usage.…”

Section: Introductionmentioning

confidence: 99%

“…It has been used for long time in almost of all areas, such as farming, fishery, forestry, and herbal medicine. However, the dryer was incovenience because of climate dependency (Djaeni et al, 2013a).…”

Section: Introductionmentioning

confidence: 99%

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Energy Efficient Dryer with Rice Husk Fuel for Agriculture Drying

Djaeni

Asiah

Suherman

et al. 2015

Int. J. Renew. Energy Dev.

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ABSTRACT:Energy usage is crucial aspect on agriculture drying process. This step spends about 70% of total energy in post harvest treatment. The design of efficient dryer with renewable energy source is urgently required due to the limitation of fossil fuel energy. This work discusses the performance of air dehumidification using rice husk fuel as heat source for onion, and paddy drying. Unlike conventional dryer, the humidity of air during the drying was dehumidified by adsorbent. Hence, the driving force of drying can be kept high. As consequences, the drying time and energy usage can be reduced. Here, the research was conducted in two step: laboratory and pilot scale tests. Results showed that the lowering air humidity with rice husk fuel has improved the energy efficiency. At operational temperature 60 o C, the heat efficiency of 75% was achieved.

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Enhancement of Energy Efficiency and Food Product Quality Using Adsorption Dryer with Zeolite

Cited by 5 publications

References 15 publications

Study on Preparation and Properties of PNIPAm/PPy Hydrogel Hygroscopic Material for Solid Dehumidification System

Study on Preparation and Properties of PNIPAm/PPy Hydrogel Hygroscopic Material for Solid Dehumidification System

Design and Performance of Scaled-Up Microwave Dryer for Seaweed Drying

Energy Efficient Dryer with Rice Husk Fuel for Agriculture Drying

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