CFD analysis of the influence of distinct thermal enhancement techniques on the efficiency of double pass solar air heater (DP-SAH)

Kumar, Sushil; Kumar, M. Pradeep; Piyush,; Harsh,; Chandini, Shaik; Chand, Satish; Kishore, T. L.; Anandaram, Harishchander; Rana, Naveen; Siddiqui, Aaliyah

doi:10.1016/j.matpr.2023.05.454

Cited by 1 publication

(1 citation statement)

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“…Its average output temperature was 18.11 °C, which means 5.22 °C above the environmental temperature, and its average thermal efficiency was 16.53 %. The difference in the temperature and thermal efficiency is due to the higher time of contact between the air and the absorber plate of the SAH of the doublepass, enhancing the heat transfer (Kashyap et al, 2023), forming higher turbulence in the pass (Kumar et al, 2023), and also the use of a double-pass allows for reduced thermal losses through the cover, because of a due to higher utilisation of this heat by the air (Pachori et al, 2023).…”

Section: Solar Air Heaters Evaluationmentioning

confidence: 99%

Solar drying of sludge of biofouling washing coming from the aquaculture industry.

Poblete,

Valencia-Ceballo,

Cortes

et al. 2023

JER

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The sludge produced in the aquaculture industry has an amount of moisture traditionally dried using the open sun drying method, which results in problems such as rewetting during rainfall events, the arrival of vectors and pollution. It is the first research where has been studied the use of a solar air heater with fins of different heights, a single and double-pass solar air heater and different thermal storage materials to enhance the efficiency of a solar dryer for drying sludge coming from the culture of Argopecten purpuratus, as a sustainable energy strategy. When using higher fins, the solar air heater requires less solar energy. With 8 cm high fins, the sludge got a constant mass when 58,567 kJ of solar energy was received in the dryer. When the height of the fins was 6, 4, and 0, a complete dried sludge was obtained with 71,394; 71,255; and 92,523 kJ of accumulative solar energy, respectively. Fin size variations result in significant differences in the drying process. The highest performance of the solar air heater was obtained with the run involving 8 cm high fins, and the performance decreased as the fins got smaller. The performance results were 6.7%, 11.0%, 21.2% and 27.9% for heights of 0, 4, 6 and 8 cm, respectively. In the evaluation of single and double pass in the solar air heater, the first one gets at the exit of the device 3.48 °C above environmental temperature, with an average thermal efficiency of 8.51% and the double pass SAH get an output temperature of 5.22 °C above the environmental temperature, and an average thermal efficiency was 16.53%. Also, different materials were evaluated as thermal storage, obtaining thermal efficiencies for heat storage were 0.88 for sand in aluminium cans, 0.49 for pebbles and 0.48 for rocks. Using these materials in a thermal storage system maintains the output temperature above the input temperature when there is low or null solar radiation. The thermal storage system permits a higher moisture reduction ever after before the sunshine, promoting a dry in the non-sunny hours.

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Section: Solar Air Heaters Evaluationmentioning

confidence: 99%