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Performance Investigation of Lab-Scale Sensible Heat Storage System

  • Chilaka Ravi Chandra Rao
  • Hakeem Niyas
  • Likhendra Prasad
  • Muthukumar Palanisamy
Conference paper
Part of the Springer Proceedings in Energy book series (SPE)

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.

Keywords

Sensible heat storage Thermal modelling Concrete Cast iron Cast steel 

Nomenclature

a

Centre distance between adjacent tubes, (m)

b

Thickness of fins on the HTF tubes, (m)

Cps

Specific heat of SHS material, (J/kg K)

Cpf

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)

ks

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

nfin

Number of fins on a HTF tube

Q

Heat storage capacity, (J)

t

Discharging time, (s)

teff

Effective discharging time, (s)

Tini

Initial temperature of storage system, (K)

Tinlet

HTF inlet temperature, (K)

Toutlet

HTF outlet Temperature, (K)

V

Volume of storage material, (m3)

Vmin

Minimum volume of storage material required to store 10 MJ, (m3)

ρs

Density of solid-state SHS material, (kg/m3)

ρf

Density of HTF, (kg/m3)

µ

Dynamic viscosity of HTF, (Ns/m2)

ηdisch

Discharging energy efficiency

\(\vec{v}\)

Velocity of HTF, (m/s)

Notes

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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Copyright information

© Springer Nature Singapore Pte Ltd. 2018

Authors and Affiliations

  • Chilaka Ravi Chandra Rao
    • 1
  • Hakeem Niyas
    • 1
  • Likhendra Prasad
    • 1
  • Muthukumar Palanisamy
    • 1
  1. 1.Department of Mechanical EngineeringIndian Institute of Technology GuwahatiGuwahatiIndia

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