NUMERICAL SIMULATION OF AN EVACUATED TUBE SOLAR COLLECTOR COUPLED TO A RESERVOIR
DOI:
https://doi.org/10.59627/cbens.2014.2095Keywords:
Solar collector, Evacuated tube, Numerical simulation, Natural convectionAbstract
This paper proposes a qualitative evaluation of natural convection that occurs in the evacuated tube solar collector. For this purpose the finite volume method was applied using the computational fluid dynamics tool FLUENT. Irradiance values on the tube of 300, 500 and 800 W / m², combined with collector 30° and 45°inclination angles were simulated. The plume behavior of the hot water coming out of the tube toward the top of the reservoir was observed. It was found the dependence of the velocity of the fluid at the outlet of the tube with the irradiance and the tilt angle. For larger angles there are higher speeds and consequently a greater homogenization of the temperature in the reservoir. Between the heated fluid ascends the reservoir and which descends to the bottom of the tube there is a shear zone where a recirculation fluid was observed.
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References
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