Abstract
Solar thermal energy is a promising solution to the environmental and energy demands issues which the world is faced with them. Among all the solar thermal collectors and solar towers used in this field, parabolic dish collectors are one of the preferable options for researchers due to their high working temperature range and high thermal performance. It has been proved that cavity receivers in solar dish collectors are the best way to achieve the best thermal performance. The main concern in the cavity receivers is their thermal efficiency enhancement by employing different geometries. The hybrid geometry of cylindrical-conical can be used to achieve the high pressure drop and low thermal efficiency of conventional cylindrical and conical cavity receivers, respectively. Furthermore, using proper insulation for the cavity receiver helps to performance enhancement of the dish collector. Ceramic fiber insulation can be suitable for this purpose due to its good thermal properties and fewer environmental issues. Hence, in this study, the objective of efficiency enhancement of parabolic dish collector is followed by utilizing a cylindrical-conical cavity receiver equipped with the fiber ceramic insulation. The results show that ceramic fiber is better insulation than the common mineral wool insulation and can enhance thermal performance by 5.03% on average. In addition, the maximum, average, and minimum thermal efficiencies of the cylindrical-conical cavity receiver by using the ceramic fiber insulation and water as the working fluid were obtained up to 38.77%, 35.19%, and 32.66%, respectively.
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Abbreviations
- \(\dot{m}\) :
-
Mass flow rate, kg/s
- \({T}_{i}\) :
-
Cavity inlet temperature, °C
- \({T}_{o}\) :
-
Cavity outlet temperature, °C
- \({\dot{Q}}_{\mathrm{total}}\) :
-
Total available solar heat rate, W
- \({\dot{Q}}_{\mathrm{useful}}\) :
-
Useful cavity heat gain rate, W
- G :
-
Solar irradiation, W/m2
- \({A}_{\mathrm{dish}}\) :
-
Dish aperture area, m2
- \({F}_{R}\) :
-
Heat removal factor
- \({U}_{L}\) :
-
Heat loss coefficient
- C :
-
Concentration ratio
- n :
-
Number
- i :
-
Indicator
- \({x}_{i}\) :
-
Investigated parameter value
- \({\overline{x} }_{i}\) :
-
Average value of investigated parameter
- \(\eta\) :
-
Efficiency
- \(\delta\) :
-
Variation
- \({\eta }_{th}\) :
-
Thermal efficiency
- \({\eta }_{op}\) :
-
Optical efficiency
- th:
-
Thermal
- o :
-
Outlet
- i :
-
Inlet
- a :
-
Ambient
- R :
-
Removal
- op:
-
Optical
- L :
-
Loss
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Acknowledgements
The authors would thank the Sepid Ceramic Fiber Company in Semnan, Iran, for their guidance on insulations properties and for providing us with adequate fiber ceramic insulation with high quality.
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Design and construction: Pouya Esfanjani; experiments: Pouya Esfanjani, Ali Mahmoudi; Writing original draft preparation: Pouya Esfanjani, Ali Mahmoudi; editing: Mohammad Sadegh Valipour, Saman Rashidi; supervision: Mohammad Sadegh Valipour, Saman Rashidi.
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Esfanjani, P., Mahmoudi, A., Valipour, M.S. et al. An experimental study on a cylindrical-conical cavity receiver for the parabolic dish collector. Environ Sci Pollut Res 30, 6517–6529 (2023). https://doi.org/10.1007/s11356-022-22569-w
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DOI: https://doi.org/10.1007/s11356-022-22569-w