Abstract
This work represents the study of four different types of absorber tubes having helical grooves. The length of the tube is 2 m, with an external and internal diameter of 25 and 19 mm, respectively. The absorber tube is analysed considering constant mass flow rate of 0.0318 kg/s. 818.5 W/m2 of constant heat flux is supplied at the lower outer surface of the tube that is facing towards the parabolic trough reflector. ANSYS FLUENT 18.0 is used for simulation which is based on finite volume method. Simulation is performed using a turbulence model of standard k-ɛ RNG type. Thermo hydraulic performances for trapezoidal, rectangular, semicircular, and triangular grooves are calculated as 0.64, 1.47, 1.56, and 2.10, respectively. Therefore, the absorber tube with triangular groove showed better thermal performance compared to others. As well as the drop of pressure for the same tube is also lowest among the other ones.
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Abbreviations
- \( C_{P} \) :
-
Specific heat of the HTF (kJ/kg K)
- \( D_{I} \) :
-
Hydraulic diameter of the tube (m)
- f :
-
Friction factor
- h :
-
Convective heat transfer coefficient (W/m2K)
- k :
-
Thermal conductivity of the HTF (W/mK)
- L :
-
Length of the tube (m)
- \( \dot{m} \) :
-
Mass flow rate of the HTF (kg/s)
- \( Nu \) :
-
Nusselt number
- Q :
-
Total heat given to the surface of tube (W)
- U :
-
Inlet velocity of the HTF (m/s)
- \( \nabla P \) :
-
Pressure drop in the tube (Pa)
- \( \nabla t \) :
-
Temperature difference (K)
- \( \rho \) :
-
Density of the HTF (kg/m3)
- \( \mu \) :
-
Dynamic viscosity (Ns/m2)
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Vishwakarma, S., Meher, P.K., Debnath, B.K., Debnath, K. (2020). Computational Analysis of Internally Grooved Absorber Tubes of Parabolic Trough Solar Collector for Constant Mass Flow Rate of the Heat Transfer Fluid. In: Biswal, B., Sarkar, B., Mahanta, P. (eds) Advances in Mechanical Engineering. Lecture Notes in Mechanical Engineering. Springer, Singapore. https://doi.org/10.1007/978-981-15-0124-1_112
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DOI: https://doi.org/10.1007/978-981-15-0124-1_112
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