Performance Assessment of Greenhouse Solar Dryer with and without Evacuated Tube Solar Collector under no-load

In this paper, the performance assessment of a hybrid active greenhouse solar dryer is carried out under no load condition. The hybrid greenhouse solar dryer consists of evacuated tube solar collector and heat exchanger kept inside the dryer that also act as the drying bed. The performance of developed dryer is evaluated with and without evacuated tube solar collector. The maximum room temperature inside the dryer with collectors is found 21.4% higher than the dryer without ETC. The average temperature difference between the room and ambient air temperature for the case of dryer with collector is 16°C while in case of dryer without ETC it is 7.51°C only. Hence the developed dryer is effective for drying of high moisture crops.

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Thermal Performance of Greenhouse Solar Dryer with Single and Double Evacuated Tube Solar Collector under no-load

Journal of Modern Thermodynamics in Mechanical System ◽

10.46610/jmtms.2021.v03i01.002 ◽

2021 ◽

Vol 3 (2) ◽

Keyword(s):

Thermal Performance ◽

Solar Collector ◽

Room Temperature ◽

Load Condition ◽

Drying Rate ◽

Evacuated Tube Solar Collector ◽

Solar Dryer ◽

Food Requirement ◽

In Series ◽

Evacuated Tube

Solar dryers are the sustainable solution for meeting the food requirement of rising population in future. The crops and other edible products can be dried to safe moisture level and then it can be stored for longer duration. An evacuated tube solar collector is attached to the hybrid greenhouse solar dryer. The thermal performance analysis of the developed hybrid dryer is carried out in active mode under no-load condition. The effect of single ETC and two ETC connected in series on the performance of the developed dryer are analyzed in the paper. The dryer with double ETC gives maximum of 22.6% higher room temperature than the dryer with single ETC. The dryer gives better performance with two ETC as higher room temperature will provide the faster drying rate but it also increase the capital cost of the dryer.

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A Study on Thermal Performance of a Novel All-Glass Evacuated Tube Solar Collector Manifold Header with an Inserted Tube

International Journal of Photoenergy ◽

10.1155/2015/409517 ◽

2015 ◽

Vol 2015 ◽

pp. 1-7 ◽

Cited By ~ 6

Author(s):

Jichun Yang ◽

Qingyang Jiang ◽

Jingxin Hou ◽

Chenglong Luo

Keyword(s):

Solar Collector ◽

Transfer Model ◽

Water Tank ◽

The Novel ◽

Water Heater ◽

Average Temperature ◽

Evacuated Tube Collector ◽

Evacuated Tube Solar Collector ◽

Evacuated Tube ◽

The Relationship

A novel all-glass evacuated tube collector manifold header with an inserted tube is proposed in this paper which makes water in all-glass evacuated solar collector tube be forced circulated to improve the performance of solar collector. And a dynamic numerical model was presented for the novel all-glass evacuated tube collector manifold header water heater system. Also, a test rig was built for model validation and comparison with traditional all-glass evacuated tube collector. The experiment results show that the efficiency of solar water heater with a novel collector manifold header is higher than traditional all-glass evacuated tube collector by about 5% and the heat transfer model of water heater system is valid. Based on the model, the relationship between the average temperature of water tank and inserted tube diameter (water mass flow) has been studied. The results show that the optimized diameter of inserted tube is 32 mm for the inner glass with the diameter of 47 mm and the water flow mass should be less than 1.6 Kg/s.

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