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Relation of change in geometrical parameters in the thermal performance of solar chimney

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Abstract

The article deals with the effects of change in dimensions of solar chimney upon the thermodynamic characteristics of the air flowing inside it. The solar chimney at Manzanares (Spain) has been selected as the base model for this study. ANSYS-Discovery-Aim 2019 R1 has been used for the simulation of different geometric variations of solar chimney along with its validation with the work by Haaf et al. It is found that of all the geometric changes, the increase in roof height is undesirable. While for others like increase in chimney height, increase in chimney diameter and increase in collector radius gives desirable results in terms of increase in velocity of air. Also, for the case with an increase in chimney diameters; it is found to be suitable if the turbines are placed at the outlet of the collector and not within the chimney.

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Abbreviations

A :

Surface area (m2)

C p :

Specific heat capacity (J/kg. K)

D :

Diameter (m)

g :

Acceleration due to gravity (m/s2)

Gr :

Grashof number

k :

Thermal conductivity (W/m-K)

L :

Length of the plate (m)

L c :

Characteristic length (m)

H :

Convective film heat transfer coefficient (W/m2-K)

H 1 :

Roof height (m)

H 2 :

Chimney height (m)

Nu :

Nusselt number

P :

Perimeter (m)

Q :

Heat flux (W/m2)

Ra :

Rayleigh number

T :

Temperature (K)

v :

Velocity (m/s2)

μ :

Dynamic viscosity (Pa-s)

p :

Density (kg/m3)

α :

Thermal diffusivity (m2/s)

v:

Kinematic viscosity (m2/s)

a :

Air

c :

Characteristic

ab :

Absorber

ch :

Chimney

co :

Collector

l :

Lateral

H :

Total height

m :

Mean

r :

Radius

s :

Surface

v :

Vertical cross-section

vw :

Virtual wall

w :

Wall

∞:

Free stream

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Authors and Affiliations

  1. Department of Mechanical Engineering, International Institute of Information Technology, Bhubaneswar, 751003, India

    Biranchi Narayana Padhi & Mukundjee Pandey

  2. Department of Mechanical Engineering, Centurion University of Technology & Management, Bhubaneswar, India

    Mukundjee Pandey & Ipsita Mishra

Authors
  1. Biranchi Narayana Padhi
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  2. Mukundjee Pandey
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  3. Ipsita Mishra
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Corresponding author

Correspondence to Mukundjee Pandey.

Additional information

Biranchi Narayana Padhi is presently working as a Faculty of Mechanical Engineering at International Institute of Information Technology, Bhubaneswar, India. His research area includes conjugate heat transfer, solar energy and energy, exergy analysis.

Mukundjee Pandey continues his Ph.D. in Department of Mechanical Engineering at International Institute of Information Technology, Bhubaneswar, India. He is currently working as an Assistant Professor in Department of Mechanical Engineering at Centurion University of Technology and Management, Odisha, India. His research area includes solar thermal energy, computational fluid dynamics, convective heat transfer and finite element analysis.

Ipsita Mishra is currently working as an Assistant Professor in Department of Mechanical Engineering at Centurion University of Technology and Management, Odisha, India. Her research area includes biofuel, solar thermal energy and computational fluid dynamics.

Declaration of competing interest

The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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Padhi, B.N., Pandey, M. & Mishra, I. Relation of change in geometrical parameters in the thermal performance of solar chimney. J Mech Sci Technol 35, 4737–4746 (2021). https://doi.org/10.1007/s12206-021-0939-8

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  • DOI: https://doi.org/10.1007/s12206-021-0939-8

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