Effects of infrared radiation drying and heat pump drying combined with tempering on the quality of long-grain paddy rice

2018 ◽  
Vol 53 (11) ◽  
pp. 2448-2456 ◽  
Author(s):  
Xuxia Zhou ◽  
Lin Liu ◽  
Pengcheng Fu ◽  
Fei Lyu ◽  
Jianyou Zhang ◽  
...  
Keyword(s):  
Heat Pump ◽  
Infrared Radiation ◽  
Paddy Rice ◽  
Heat Pump Drying

scholarly journals ENERGY SAVING TECHNOLOGIES FOR DRYING OF HEAT-SENSITIVE MATERIALS

2019 ◽  
Vol 41 (4) ◽  
pp. 5-12
Author(s):  
Yu.F. Sniezhkin ◽  
Xiong Jian ◽  
D.M. Chalaev ◽  
М.М. Ulanov ◽  
N.О. Dabizha
Keyword(s):  
Heat Pump ◽  
Thermal Conditions ◽  
High Energy ◽  
Heat Pumps ◽  
Convective Drying ◽  
Drying Time ◽  
Long Duration ◽  
Heat Pump Drying ◽  
Promising Development

The promising development of convective drying of thermolabile materials is the use of heat pumps. The main advantages of heat pump drying are high energy efficiency, controlled thermal conditions of drying, high quality of the final product, environmental cleanliness of the technological process.The processes of air treatment in convective heat pumps with different schemes of dehydration of the drying agent are considered in the paper. As determined, the main disadvantage of heat pump drying is the long duration of the process due to the drying temperature limitation not exceeding 50-60 °C, and the dried material is not initially heated above the temperature of the wet thermometer, which is 25-30 °C. The possibility of using infrared radiation in combination with a heat pump was studied to intensify the process of low-temperature convective drying. It is shown that the combination of heat pump and infrared drying processes provides a synergistic effect, which leads to a shorter drying time and reduced energy consumption, as well as to obtain better quality dried products.

Study on drying bamboo shoots by Sasaki heat pump drying technology

2021 ◽  
Vol 63 (6) ◽  
pp. 57-62
Author(s):  
Thi Bac Doan ◽  
◽  
Thu Hang Ta ◽  
Dac Binh Minh Nguyen ◽  
Thi Hoang Lan Nguyen ◽  
...  
Keyword(s):  
Heat Pump ◽  
Salt Concentration ◽  
Color Variation ◽  
Food Hygiene ◽  
Bamboo Shoots ◽  
Heat Pump Drying ◽  
Drying Technology ◽  
Water Compensation ◽  
Cyanide Content

The study was conducted to investigate the effects of blanching regimes at the salt concentration and drying temperature using Sasaki heat pump drying technology on the quality of dried bamboo shoots to create a product that can be kept color, flavour, and quality. Fresh bamboo shoots were cut into slices with a thickness of 6 mm, boiled in hot saltwater at 100oC at different concentrations (0, 1, 3, 5%) for 15 minutes. Then, they were dried in the temperature setting differences (30, 40, 50oC) by Sasaki dryers and tested for moisture, color, cyanide content, microorganisms, water compensation capacity, and product sensory quality. Fresh bamboo shoots were boiled in hot saltwater at 100oC, 3% salt concentration for 15 minutes, and dried at 40oC by Sasaki drier for the best quality. This treatment mode provides the lowest color variation and the best water compensation compared to other treatment modes. Dried bamboo shoots are bright yellow, uniform color, characteristic odour, toughness with little deformation, low cyanide content, and microbiological content below the threshold of food hygiene and safety.

scholarly journals Experimental study of infrared – assisted heat pump drying of lime slices

2021 ◽  
pp. 1-10
Author(s):  
Nguyen Minh Ha ◽  
Ha Anh Tung
Keyword(s):  
Heat Pump ◽  
Radiation Intensity ◽  
Infrared Radiation ◽  
Effect Of Temperature ◽  
Air Velocity ◽  
Drying Time ◽  
Infrared Radiator ◽  
Chamber Temperature ◽  
Heat Pump Drying ◽  
Drying Chamber

This paper describes the experimental drying of lime slices using an infrared –assisted heat pump dryer. Experiments were carried out on a heat pump dryer model with a capacity of 1 HP integrated with 2000 W infrared radiator whose power can be varied from 0% to 100%. Experiments have been performed with the drying capacity of 1,2 kg/batch and the drying air velocity of 1,2 m/s. Three evaluations were considered: the effect of material thickness on drying time; the effect of temperature in drying chamber and intensity of infrared radiation on drying time, power consumption and product quality. The results showed that the drying process having 3 mm thickness of lime slices, the temperature in the drying chamber of 42,5¸45oC and the radiation intensity of 110¸300W/m2 was the good effective drying range. In addition, the study formulated a linear regression equation for the drying time relationship with drying chamber temperature and infrared radiation intensity. This mathematical model can be used as reference to determine actual drying time as well as a helpful tool for designing infrared - heat pump dryer.

scholarly journals A combined infrared/heat pump drying technology applied to a rotary dryer

2002 ◽  
Vol 11 (3) ◽  
pp. 209-218 ◽  
Author(s):  
K. PÄÄKKÖNEN
Keyword(s):  
Heat Pump ◽  
Infrared Radiation ◽  
Crop Production ◽  
Quality Parameters ◽  
Small Scale ◽  
Rehydration Ratio ◽  
Drying Time ◽  
Operation Temperature ◽  
Rotary Dryer ◽  
Heat Pump Drying

The short drying time and low product temperature makes it suitable for drying such heat-sensitive materials as herbs and vegetables. The purpose of this work was to develop a small-scale dryer for herbs and vegetables. A prototype rotary dryer combining infrared radiation with a so-called heat pump drying method was applied in drying experiments for several herbs and vegetables. The drying experiments were performed under actual crop production conditions. The drying curves for leaves of birch (Betula spp.), rosebay willowherb (Epilobium angustifolium) and dandelion (Taraxacum spp.) as well as slices of red beet (Beta vulgaris) and carrot (Daucus carota) are presented. During the drying operation, temperature and humidity of the drying air were recorded, as well as the energy consumed in drying. The quality parameters measured were water content, colour and rehydration ratio. In the present rotary dryer design, intermittent irradiation and mixing of the product enable to avoid overheating, which is particularly important for maintaining product quality. In this dryer design the drying drum slowly rotates and simultaneously mixes the product. The infrared heaters are attached to a panel, allowing the product to receive infrared radiation periodically.

scholarly journals Drying characteristics and quality of lemon slices dried undergone Coulomb force assisted heat pump drying

2018 ◽  
Author(s):  
S. K. Chin ◽  
Y. H. Lee ◽  
B. K. Chung
Keyword(s):  
Vitamin C ◽  
Heat Pump ◽  
Coulomb Force ◽  
Total Phenolic ◽  
Drying Rate ◽  
Total Energy Consumption ◽  
Drying Time ◽  
Drying Characteristics ◽  
Heat Pump Drying

In this research, a Coulomb force assisted heat pump (CF-HP) dryer was invented for the purpose of improving the drying characteristics and product quality of biomaterials. As compared to heat pump drying alone, the assistance of Coulomb force in heat pump dryer enhanced the drying rates and effective moisture diffusivity of lemon slices up to 26%, which eventually shortened the total drying time to 40%. This saved the total energy consumption of HP drying by 31.5%. High retention of vitamin C and TPC were also found in CF-HP dried slices due to mild drying temperature and fast drying rate. Keywords: Coulomb force; Heat pump drying; Drying rate; Vitamin C; Total Phenolic Content (TPC).  

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