Experimental investigation on a solar assisted heat pump in-store drying system

Li, Yuehua; Li, H.F.; Dai, Yanjun; Gao, Sen; Lei, Wei; Li, Z.L.; Odinez, I.G.; Wang, Ruzhu

doi:10.1016/j.applthermaleng.2011.02.014

Cited by 44 publications

(18 citation statements)

References 7 publications

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“…Air is drawn through the dryer by natural convection or sometimes by a fan. It is heated as it passes through the collector and then partially cooled as it catches moisture from the material [24][25][26][27]. The material is heated both by the air and sometimes directly by the sun.…”

Section: Solar Dryermentioning

confidence: 99%

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A Review on Solar Drying of Agricultural Produce

Tiwari¹

2016

J Food Process Technol

112

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Section: Solar Dryermentioning

confidence: 99%

“…Li et al [27] Pegaga leaf Solar assisted dehumidification dryer -The colour of solar dried pegaga leaf did not become darker due to the lower air temperature and Rh used (T< 56°C, RH< 36%). -Pegaga leaf dried at 65°C using hot air became darker.…”

Section: Balladin Andmentioning

confidence: 99%

A Review on Solar Drying of Agricultural Produce

Tiwari¹

2016

J Food Process Technol

112

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“…Drying operation is performed in moderate conditions of temperature and humidity due to air dehumidification, allowing the retention of bioactive compounds that are heat sensitive (Li et al . ).…”

Section: Introductionmentioning

confidence: 97%

“…This equipment consists of a drying chamber and a heat pump (evaporator, condenser, compressor and expansion valve). Drying operation is performed in moderate conditions of temperature and humidity due to air dehumidification, allowing the retention of bioactive compounds that are heat sensitive (Li et al 2011).…”

Section: Introductionmentioning

confidence: 99%

Optimization of Spirulina sp. Drying in Heat Pump: Effects on the Physicochemical Properties and Color Parameters

Costa

Rodrigues

Rocha

et al. 2015

Journal of Food Processing and Preservation

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The aim of this work was to optimize the drying operation of Spirulina sp. using the heat pump to dehumidify the air. An experimental design using the drying air temperature (30, 40 and 50C) and the initial sample thickness (1, 3 and 5 mm) was performed. The responses were the physicochemical properties and the color parameters of the dried microalgae. The air temperature presented the highest effect on the phycocyanin content, while the sample thickness showed the highest influence on the other responses. The optimal operating conditions for the heat pump drying of Spirulina sp. were at air drying temperature of 50C and sample thickness of 5 mm. The phycocyanin content, total antioxidant activity and color difference were found to be 19.60 mg/g, 52.6% and 5.71, respectively. Thermograms (differential scanning calorimetry) showed that under these conditions, the product showed the highest thermal stability. PRACTICAL APPLICATIONSThe culture of Spirulina sp. is attractive for various commercial purposes, such as nutritional supplement for humans and animals and supply of active metabolites in the pharmaceutical and cosmetic industry. The conventional tray drying is a traditional method that is used in the microalgae drying. However, the heat pump drying enables operation in lower temperatures than the traditionally used in convective hot air drying. This operation occurs in moderate conditions of temperature and humidity due to air dehumidification, leading to retention of bioactive compounds in products that are heat sensitive. Therefore, the use of heat pump dryer for the production of dried Spirulina should be promising to preserve its phytochemicals and physical characteristics. The benefits of heat pump drying have been shown in different studies in the literature, but there are no reports about its use in Spirulina drying and its influence on the physicochemical and functional characteristics.

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“…This equipment consists of a drying chamber and a heat pump (evaporator, condenser, compressor and expansion valve). The drying operation occurs in mild conditions of temperature and humidity due to air dehumidification, promoting retention of bioactive compounds which are heat sensitive (Li et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Physicochemical characteristics of the Spirulina sp. dried in heat pump and conventional tray dryers

Costa

Rocha

Rodrigues

et al. 2015

Int J of Food Sci Tech

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Summary A comparative study of Spirulina drying in heat pump dryer (HPD) and in conventional tray dryer (CTD) was performed. The effects of the methods used for the sample were evaluated in relation to the operation kinetics and the characteristics of the dehydrated microalgae. The air temperatures were 50 and 60 °C, and the absolute humidity of HPD was ten times smaller than in CTD. The values of the total drying time of HPD were 40% inferior to the found in CTD, for both air temperatures. The highest preservation of the Spirulina characteristics was found in HPD and air temperature of 50 °C, and in this condition, the values of phycocyanin, total phenolic compounds and total antioxidant activity were 14%, 60% and 10% higher than the values to the found in the same condition for CTD, respectively. These results are showing that the drying method is decisive in the product quality dehydrated.

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Experimental investigation on a solar assisted heat pump in-store drying system

Cited by 44 publications

References 7 publications

A Review on Solar Drying of Agricultural Produce

A Review on Solar Drying of Agricultural Produce

Optimization of Spirulina sp. Drying in Heat Pump: Effects on the Physicochemical Properties and Color Parameters

Physicochemical characteristics of the Spirulina sp. dried in heat pump and conventional tray dryers

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