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Performance Improvement Techniques in Shell-and-Tube Type of LHS Unit

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Advances in Thermofluids and Renewable Energy

Part of the book series: Lecture Notes in Mechanical Engineering ((LNME))

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Abstract

This study presents a thermal performance comparative study of three shell-and-tube latent heat storage (LHS) models. With the help of the optimization technique, 19 tubes are chosen with an internal and external diameter of 17 mm and 20 mm, respectively. In the first case, the LHS model is considered without fins. In the second case, the LHS model is also modeled without fins, but the phase changing materials (PCM) are mixed with 5% volume fraction of Cu nanoparticles. In the third case, every HTF tube is supported by four fins. In order to maintain the same volume of PCM in all the models, shell diameter of the first LHS model is 235 mm and for the second and third cases, the diameter is set to be 240 mm. Commercial sugar alcohol known as Erythritol (C4H10O4) is considered as PCM. ANSYS Fluent environment is employed for the numerical modeling and solution of the governing equations representing PCM. The performance study of LHS units is evaluated using parameters, such as transient temperature and liquid fraction. In order to account buoyancy impact of liquid PCM, Boussinesq approximation method is applied to the model. The inner walls of the HTF tubes are maintained at 138 °C as inlet temperature. The numerical estimations are validated against experimental results. LHS model in the third case, which is supported by fins, becomes fully charged after 80 min, whereas, LHS models in the first and second cases take 120 and 136 min, respectively, for complete melting.

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Abbreviations

A Mush :

Mushy region constant value

Cp:

Specific heat capacity (J kg−1 K−1)

F :

Body force (N m−3)

g :

Acceleration due to gravity (m s−2)

h :

Specific enthalpy (J/kg)

L :

Latent heat of fusion (J kg−1)

k :

Thermal conductivity (W m−1 K−1)

P :

Pressure (Pa)

S :

Darcy law’s source term

T :

Temperature (K)

v :

Velocity (m/s)

ρ :

Density (kg/m3)

β :

Coefficient of thermal expansion (1/K)

µ :

Dynamic viscosity (Ns/m2)

θ :

Melt fraction

\(\varphi\) :

Nanoparticles volume fraction

ini:

Initial

l:

Liquid

np:

Nanoparticle

nPCM:

Nanophase change material

s:

Solid

Ref:

Reference

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Author information

Authors and Affiliations

  1. Center for Energy, Indian Institute of Technology Guwahati, Guwahati, Assam, 781039, India

    Berihu Gebreyohannes Abreha

  2. Department of Mechanical Engineering, Indian Institute of Technology Guwahati, Guwahati, Assam, 781039, India

    Pinakeswar Mahanta

  3. National Institute of Technology Arunachal Pradesh, Yupia, Arunachal Pradesh, 791112, India

    Pinakeswar Mahanta

  4. Department of Electronics and Electrical Engineering, Indian Institute of Technology Guwahati, Guwahati, Assam, 781039, India

    Gaurav Trivedi

Authors
  1. Berihu Gebreyohannes Abreha
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  2. Pinakeswar Mahanta
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  3. Gaurav Trivedi
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Corresponding author

Correspondence to Pinakeswar Mahanta .

Editor information

Editors and Affiliations

  1. Department of Mechanical Engineering, Indian Institute of Technology Guwahati, Guwahati, Assam, India

    Pinakeswar Mahanta

  2. Department of Mechanical Engineering, Indian Institute of Technology Guwahati, Guwahati, Assam, India

    Pankaj Kalita

  3. Department of Mechanical Engineering, National Institute of Technology Arunachal Pradesh, Yupia, Arunachal Pradesh, India

    Anup Paul

  4. Department of Electrical Engineering, National Institute of Technology Arunachal Pradesh, Yupia, Arunachal Pradesh, India

    Abhik Banerjee

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Abreha, B.G., Mahanta, P., Trivedi, G. (2022). Performance Improvement Techniques in Shell-and-Tube Type of LHS Unit. In: Mahanta, P., Kalita, P., Paul, A., Banerjee, A. (eds) Advances in Thermofluids and Renewable Energy . Lecture Notes in Mechanical Engineering. Springer, Singapore. https://doi.org/10.1007/978-981-16-3497-0_12

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  • DOI: https://doi.org/10.1007/978-981-16-3497-0_12

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  • Publisher Name: Springer, Singapore

  • Print ISBN: 978-981-16-3496-3

  • Online ISBN: 978-981-16-3497-0

  • eBook Packages: EngineeringEngineering (R0)

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