An overview of a polyhouse dryer

Sangamithra, A.; Swamy, Gabriela John; Prema, R. Sorna; Priyavarshini, R.; Chandrasekar, V.; Sasikala, S.

doi:10.1016/j.rser.2014.08.007

Cited by 22 publications

(8 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…After 5 p.m., the samples were packed in air tight polythene covers and kept for greenhouse heating. The design, development and efficiency of polyhouse dryer has been reviewed by Sangamithra et al (2014) whereas the features and benefits of indirect type solar dryer for agricultural crops has been reviewed by Lingayat et al (2020). Khama et al (2016) classified the solar dryers into active or passive mode.…”

Section: Performance Evaluation Of Greenhouse Type Solar Dryermentioning

confidence: 99%

Development and effectiveness of greenhouse type solar dryer for coriander leaves

Singh¹,

Samsher²,

Singh³

et al. 2022

JEB

View full text Add to dashboard Cite

Aim: Sun drying system is not able to provide the best drying performance and quality dried produce of leafy vegetables. To facilitate better options to the farmers, this study aims to develop and evaluate a cost-effective greenhouse type solar dryer to improve shelf stability of coriander leaves. Methodology: A greenhouse type solar dryer (5m x 3m x 2.3m) was developed with the provision of rigid frame, 200 µ UV stabilized LDPE glazing material, solar collector cum drying chamber, inlet air and outlet air openings. The dryer was evaluated for its performance, drying characteristics of coriander leaves and qualitative evaluation of dried product as compared to open sun drying. Results: The greenhouse type solar dryer performed well for coriander drying with increased level of temperature inside the dryer (42oC) and 24% reduced drying time as compared to sun drying (29oC).The loading capacity, efficiency, payback period and B:C ratio of the dryer were found to be 100 kg, 70.47 %, 1.26 yr and 1.79, respectively. The drying of coriander leaves occured mostly in falling rate period. Coriander leaves dried under the dryer possessed higher values of chlorophyll content (1.356 mg g-1 of tissue), ascorbic acid content (111.257 mg 100g-1), rehydration ratio (5.302) and coefficient of rehydration (0.762) than sun dried coriander leaves with the respective values of these quality parameters being 1.097 mg g-1 of tissue, 62.37 mg 100g-1, 4.715 and 0.689, respectively.

show abstract

Section: Performance Evaluation Of Greenhouse Type Solar Dryermentioning

confidence: 99%

Development and effectiveness of greenhouse type solar dryer for coriander leaves

Singh¹,

Samsher²,

Singh³

et al. 2022

JEB

View full text Add to dashboard Cite

show abstract

“…Hence, the high rate of drying in solar poly house dryer resulted in reduction of drying time compared to conventional method. It was reported that the temperature inside the poly house dryer was 62-76% higher than the ambient temperature and the relative humidity inside the dryer varied from 26-50% resulting in high rate of drying (Sangamithra, 2014 ). In poly house dryer, the solar radiation passes through the transparent sheet and will be retained in the drying chamber thus increasing the temperature of the air.…”

Section: Drying Characteristics Of Granular Jaggery In Polyhousementioning

confidence: 99%

“…The solar dryers are reported to be suitable for retaining vitamins in preserved fruits, and colour in highly pigmented commodities (Jain and Tiwari, 2015). The quality and color of polyhouse dried products were proved to be superior than that in natural sun drying (Sangamithra, 2014) Alphabets in small letters (a and b) in the superscripts denote that the mean values are statistically; Different within the row at p<0.05…”

Section: Quality Analysis Of Jaggerymentioning

confidence: 99%

Development of Polyhouse Solar Dryer for Drying Granular Jaggery

Sreedevi¹,

Veerabhadrarao²,

Jamuna³

et al. 2021

IJBSM

View full text Add to dashboard Cite

Jaggery is a traditional Indian sweetener prepared from sugarcane juice through evaporation process and is considered as medicinal sugar due to its nutritional and thereupatic properties. To improve the shelf-life of solid jaggery , making jaggery in the form of granules with moisture content of 1–2% was recommended. A Polyhouse solar dryer for drying granular jaggery with a capacity of 200 kg was developed at Regional Agricultural Research Station, Anakapalle, Andhra Pradesh, India. Traditionally, granular jaggery was dried in openyard resulting in contamination with dust, insects, birds and rain. A comparative study was carried for drying granular jaggery with initial moisture of 9.3 to 10.5% (db) in both polyhouse solar dryer and in an open yard during the month of March– April, 2019. The study revealed that the rate of drying was faster in poly house compared to open yard drying. The temperature inside the polyhouse dryer was 59% higher than the ambient conditions. The percent saving in time for drying of granular jaggery in poly house dryer was 38% to attain optimum moisture content of 1.7% for stable shelf life besides maintaining hygienic conditions. The quality parameters of jaggery in terms of sucrose and reducing sugars percentage showed insignificant changes in both methods. However, the color of the granular jaggery was well retained in polyhouse dryer compared to open yard drying. Hence, this study will be helpful for small and micro entrepreneurs for large scale drying of granular jaggery under hygienic conditions utilizing renewable energy resources.

show abstract

“…The product is being dried by removing moisture from the inside to the surface of the product. The heated air in the solar dryer causes the vapour pressure of moisture inside the product and the moisture carrying capacity of the warm air to increase by decreasing its relative humidity [25]. Figure 2 shows drying process progression for the agricultural product where an initial heating period is first by an initial constant rate drying period and then by a subsequent falling rate drying period [9].…”

Section: Figure 1 Solar Dryermentioning

confidence: 99%

Recent advances in solar drying system: A Review

Razak

Tarminzi²,

Azmi³

et al. 2021

IJETS

View full text Add to dashboard Cite

Research on solar dryer technology proliferates since it reduces the drying period while keeping nutritional values in the agricultural products. This paper presented a review of recent advances in the solar drying system. This review is composed of working principles and classifications of solar dryers. They were classified into two main elements: airflow modes, either passive or active, and the way heat is transferred: direct, indirect, mixed-mode, and hybrid. The hybrid system used several types of elements to supply additional heat in the drying system, as elaborated in this paper, such as the electrical heater, biomass, and photovoltaic system. The advantages and disadvantages of the solar dryer also being discussed in this paper

show abstract

An overview of a polyhouse dryer

Cited by 22 publications

References 43 publications

Development and effectiveness of greenhouse type solar dryer for coriander leaves

Development and effectiveness of greenhouse type solar dryer for coriander leaves

Development of Polyhouse Solar Dryer for Drying Granular Jaggery

Recent advances in solar drying system: A Review

Contact Info

Product

Resources

About