Abstract
This paper presents the theoretical investigation of heat storage characteristics and transient behaviour of a sensible heat storage (SHS) module of 10 MJ storage capacity designed for discharging the heat in the temperature range of 523–623 K for solar power plant applications. Thermal model of heat storage module in cylindrical configuration has been developed considering the heat transfer enhancement technique in the storage module by incorporating the axial fins on the discharging tube surfaces. High thermal conductivity (cast iron and cast steel) and low thermal conductivity (concrete) materials have been chosen as the SHS materials for the present analysis. Number of discharging tubes with axial fins over the tube periphery has been optimized based on the charging time.
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Abbreviations
- a :
-
Centre distance between adjacent tubes, (m)
- b :
-
Thickness of fins on the HTF tubes, (m)
- C ps :
-
Specific heat of SHS material, (J/kg K)
- C pf :
-
Specific heat of heat transfer fluid, (J/kg K)
- d :
-
Internal diameter of the HTF tubes, (m)
- D :
-
Diameter of storage module, (m)
- h :
-
Height of fins on the charging tubes, (m)
- k s :
-
Thermal conductivity of SHS material, (W/m K)
- L :
-
Length of SHS module, (m)
- m :
-
Mass of SHS material, (kg)
- n :
-
Number of HTF tubes
- n fin :
-
Number of fins on a HTF tube
- Q :
-
Heat storage capacity, (J)
- t :
-
Discharging time, (s)
- t eff :
-
Effective discharging time, (s)
- T ini :
-
Initial temperature of storage system, (K)
- T inlet :
-
HTF inlet temperature, (K)
- T outlet :
-
HTF outlet Temperature, (K)
- V :
-
Volume of storage material, (m3)
- V min :
-
Minimum volume of storage material required to store 10 MJ, (m3)
- ρ s :
-
Density of solid-state SHS material, (kg/m3)
- ρ f :
-
Density of HTF, (kg/m3)
- µ :
-
Dynamic viscosity of HTF, (Ns/m2)
- η disch :
-
Discharging energy efficiency
- \(\vec{v}\) :
-
Velocity of HTF, (m/s)
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Acknowledgements
The authors sincerely thank the Department of Science and Technology (DST), Government of India, for the financial support (Project No: DST/TM/SERI/2K10/53(G)).
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Rao, C.R.C., Niyas, H., Prasad, L., Palanisamy, M. (2018). Performance Investigation of Lab-Scale Sensible Heat Storage System. In: Chandra, L., Dixit, A. (eds) Concentrated Solar Thermal Energy Technologies. Springer Proceedings in Energy. Springer, Singapore. https://doi.org/10.1007/978-981-10-4576-9_16
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