Changes during storage of driedMoringa oleiferaleaves prepared by heat pump-assisted dehumidified air drying

2015 ◽  
Vol 50 (5) ◽  
pp. 1224-1233 ◽  
Author(s):  
Yuparat Potisate ◽  
William L. Kerr ◽  
Singhanat Phoungchandang
Keyword(s):  
Heat Pump ◽  
Air Drying ◽  
Dehumidified Air Drying

scholarly journals Determining the Effect of Pre-Treatment in Rice Noodle Quality Subjected to Dehydration through Hierarchical Scoring

Processes ◽  
2021 ◽  
Vol 9 (8) ◽  
pp. 1309
Author(s):  
Muhammad Heikal Ismail ◽  
Hii Ching Lik ◽  
Winny Routray ◽  
Meng Wai Woo
Keyword(s):  
Heat Pump ◽  
Freeze Drying ◽  
Oil Content ◽  
Hot Air Drying ◽  
Air Drying ◽  
Starch Gelatinization ◽  
Hot Air ◽  
Heat Pump Drying ◽  
Pre Treatment ◽  
Noodle Quality

Fresh rice noodle was usually coated in a large amount of oil to avoid stickiness and extend the shelf life. Pre-treatment has been applied to reduce the quantity of oil in rice noodle. In this research, the pre-treatment and temperature effect on the rice noodle quality subjected to hot air drying, heat pump drying, and freeze drying was investigated. Texture, color, oil content, and starch gelatinization of the dried noodle was further evaluated. Results revealed that there were significant differences (p < 0.05%) in texture, color, oil content, and starch gelatinization in rice noodle subjected to pre-treatment. Furthermore, the texture, color, oil content, and starch gelatinization demonstrated a significant difference (p < 0.05%) in freeze drying rather than hot air drying and heat pump drying. The findings indicate that the qualitative features of the dehydrated noodle are synergistic to pretreatment and drying temperature. Despite superior quality shown by freeze drying, the hierarchical scoring has proven that rice noodle undergoing hot air drying at 30 °C to produce comparable quality attributes. The hierarchical scoring can be a useful tool in quality determination for the food industry.

Carrageenan drying with dehumidified air: drying characteristics and product quality

2012 ◽  
Vol 8 (3) ◽  
Author(s):  
Mohamad Djaeni ◽  
Setia Budi Sasongko ◽  
Aji Prasetyaningrum ◽  
Xin Jin ◽  
Anton J. van Boxtel
Keyword(s):  
Product Quality ◽  
Dimensional Model ◽  
Air Velocity ◽  
Drying Time ◽  
Air Drying ◽  
Drying Characteristics ◽  
Operational Conditions ◽  
Operational Temperature ◽  
Dehumidified Air Drying ◽  
Carrageenan Quality

Abstract Applying dehumidified air is considered as an option to retain quality in carrageenan drying. This work concerns the effects of operational temperature, air velocity, and carrageenan thickness on the progress of drying and product quality when using dehumidified air. Final product quality and progress of drying were measured by experiments, and a two dimensional model was developed to analyze progress of drying for the different operational conditions. The experimental and modeling results showed that air dehumidification with zeolite reduces the drying time the most at low temperatures. Under these conditions the carrageenan qualities whiteness and gel strength are the least affected by the exposure to the drying temperature. The drying time is the shortest at 120°C, but at this temperature the carrageenan quality degrades the most and is not be improved by air dehumidification. Moreover, the quality is improved by increasing the air velocity and by drying thin carrageenan sheets.

scholarly journals Study on Quality Influence of Hot Air Drying and Heat pump drying of Xiaocaoba Gastrodia elata

2020 ◽  
Vol 1601 ◽  
pp. 042009
Author(s):  
Bin Cheng ◽  
Chao Tan ◽  
Xiuying Tang ◽  
Zheyu Chu ◽  
Jiabao Min ◽  
...  
Keyword(s):  
Heat Pump ◽  
Gastrodia Elata ◽  
Hot Air Drying ◽  
Air Drying ◽  
Hot Air ◽  
Heat Pump Drying

scholarly journals Preservation of mesophilic mixed culture for anaerobic palm oil mill effluent treatment by convective drying methods

2018 ◽  
Author(s):  
S. K. Chin ◽  
D. T. Tan ◽  
H. M. Tan ◽  
P. E. Poh
Keyword(s):  
Heat Pump ◽  
Oxygen Demand ◽  
Effluent Treatment ◽  
Convective Drying ◽  
Drying Methods ◽  
Liquid Form ◽  
Air Drying ◽  
Log Reduction ◽  
Hot Air ◽  
Heat Pump Drying

While anaerobic digestion is a reliable method that treats the waste and produces renewable biomethane fuel, the necessary sludge in liquid form is difficult to handle due to the constant biogas generation. Therefore, this study investigates the possibility of convective air drying, namely heat pump and hot air circulation oven as preservation methods for anaerobic microbial sludge. Drying was conducted at various temperatures, ranging from 22℃ to 70℃. The study found that heat pump drying at 22℃ resulted in highest COD removal of 55.3% as well as the least log reduction in methanogens and anaerobes at 1.4 and 2.4, respectively.Keywords: Chemical Oxygen Demand (COD); Heat pump drying; Hot air drying; Log reduction; Methane yield   

The Air Cycle Heat Pump

1948 ◽  
Vol 158 (1) ◽  
pp. 30-51 ◽  
Author(s):  
T. F. Thomas
Keyword(s):  
Heat Pump ◽  
Heat Exchangers ◽  
Electric Heating ◽  
Heat Losses ◽  
Paper Briefly ◽  
Air Drying ◽  
Working Medium ◽  
Compression And Expansion ◽  
Lord Kelvin ◽  
The Ideal

The air cycle heat pump, using air both as working medium and as heat carrier, and suggested by Lord Kelvin nearly 100 years ago, has advantages as a means of combined heating and ventilating, on account of its simplicity and the recovery of ventilation heat losses. The paper briefly examines the theoretical possibilities of the air cycle for space heating and air drying. While the ideal air cycle is highly efficient with perfect machines, the inefficiency of actual machines and the temperature difference and air pressure drop across the heat exchanger reduce the performance considerably; but the power consumption for the net heat load is appreciably less than that for direct electric heating, whilst ventilation—for which electric heating is less suited—is provided in addition. Thus for certain applications such as hospitals, hotels, and restaurants where the number of air changes is greater, the air cycle heat pump might have economic advantages. The need for the improvement of heat exchangers is indicated, and the possibility of replacing separate compression and expansion machines by a “pressure exchanger” is discussed.

The Effects of Drying Techniques on Clay-Rich Soil Texture

1974 ◽  
Vol 32 ◽  
pp. 466-467
Author(s):  
T. G. Naymik
Keyword(s):  
Critical Point ◽  
Liquid Nitrogen ◽  
Liquid Nitrogen Temperature ◽  
Drying Methods ◽  
Air Drying ◽  
Freeze Dried ◽  
Critical Point Drying ◽  
Set Up ◽  
The Relationship ◽  
Quartz Grains

Three techniques were incorporated for drying clay-rich specimens: air-drying, freeze-drying and critical point drying. In air-drying, the specimens were set out for several days to dry or were placed in an oven (80°F) for several hours. The freeze-dried specimens were frozen by immersion in liquid nitrogen or in isopentane at near liquid nitrogen temperature and then were immediately placed in the freeze-dry vacuum chamber. The critical point specimens were molded in agar immediately after sampling. When the agar had set up the dehydration series, water-alcohol-amyl acetate-CO2 was carried out. The objectives were to compare the fabric plasmas (clays and precipitates), fabricskeletons (quartz grains) and the relationship between them for each drying technique. The three drying methods are not only applicable to the study of treated soils, but can be incorporated into all SEM clay soil studies.

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