Abstract
This work focuses on meeting the growing demand in solar energy conversion for small-scale applications. In this regard, experimental and CFD research has been done to examine the thermal performance (energy and exergy efficiencies) of a dish collector (reflector and receiver) system with different receiver models. In this work, receivers with uniform absorber cavity areas having cylindrical and hemispherical shapes were modeled for length-to-diameter ratios (L/D) of 1.5, 1, and 0.75. The modeled receivers having coil tube configurations concerning the geometrical shape of the models were tested with two different materials of aluminum and copper. The performance of the receiver models was compared by experimental and CFD methods for the average solar direct normal irradiations of 860 W/m2 by the dish reflector area of almost 12 m2. The supplied average heat flux by the dish reflector was 7 kW/m2 at the absorbing area of the cavity receivers. The energy and exergy efficiencies from the experimental and CFD analyses on the models were determined based on the cavity surface temperature distribution of receiver walls, and heat gain for different mass flow rates by the heat transfer fluid water. The receiver with copper material and L/D ratio of 0.75 has been found as the optimized one among all other models with the maximum obtained energy and exergy efficiencies of 73.64 and 7.31% when water is used as the heat transfer fluid. The performance of the optimized receiver model was also validated with a few other heat transfer fluids such as SiC + water nanofluid and therminol VP1.
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Abbreviations
- A R :
-
Area of the receiver (m2)
- A ref :
-
Area of the reflector (m2)
- T atm :
-
Atmospheric temperature (°C)
- c av :
-
Average specific heat capacity (J/kg K)
- T avg :
-
Average wall temperature (°C)
- DNI:
-
Direct normal irradiation (Wh/m2)
- E a :
-
Energy focused on the receiver (kWh)
- E R :
-
Energy gained by the receiver (kWh)
- T in :
-
Fluid inlet temperature (°C)
- ṁ :
-
Mass flow rate of heat transfer fluid (kg/s)
- η EnR :
-
Receiver energy efficiency
- η ExR :
-
Receiver exergy efficiency
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RDR—writing original manuscript, review and editing. GSE—project administration, formal analysis, review and editing. SKN—software, review and editing. MMA—review and editing.
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Ramalingam, R.D., Esakkimuthu, G.S., Natarajan, S.K. et al. Energy and exergy studies on the receiver models with materials and heat transfer fluids. Environ Sci Pollut Res 31, 4764–4778 (2024). https://doi.org/10.1007/s11356-023-31428-1
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DOI: https://doi.org/10.1007/s11356-023-31428-1