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Analysis of exergy and parametric study of a v-corrugated solar air heater

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Abstract

Solar air heater requires investigation for enhancement of solar energy conversion into heat. Different configurations with various artificial roughness geometries are proposed to date. In present study attention is paid on ways leading to more delivery of exergy by a v-corrugated solar air heater through parametric study. Effects of aspect ratio of the collector, inlet air temperature, mass flow rate per collector area etc. are studied.

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Abbreviations

L :

Length of collector (m)

W :

Width of collector (m)

A :

Collector area (\( L \times W \)) (m2)

\( Q_{u} \) :

Useful heat energy gain of the collector (W)

\( \dot{m} \) :

Mass flow rate of air through collector (kg/s)

\( \dot{M} \) :

\( \dot{m} \) Divided by collector area (kg/m2 s)

G :

Mass flux in passage, \( \dot{m} \) divided by passage area (kg/m2 s)

T :

Temperature (K)

\( C_{p} \) :

Specific heat (J/kg K)

\( U_{b} \) :

Bottom heat loss coefficient (W/m2 K)

\( U_{t} \) :

Top heat loss coefficient (W/m2 K)

\( U_{L} \) :

Total heat loss coefficient (W/m2 K)

V :

Velocity (m/s)

\( W_{p} \) :

Pump work (W)

S :

Absorbed flux of sun radiation (W/m2)

\( S_{g} \) :

Entropy created due to heating of air and pressure drop (W/K)

Re :

Reynolds number

\( D_{h} \) :

Hydraulic diameter of the passage (m)

b :

One-half altitude of the v-corrugated passage (m)

\( F_{R} \) :

Collector heat removal factor

\( F^{'} \) :

Collector efficiency factor

IR :

Irreversibility (W)

\( I_{T,c} \) :

Radiation incident on glass cover (W/m2)

h :

Convective heat-transfer coefficient (W/m2 K)

p :

Pressure (N/m2)

\( h_{1} \) :

Convective heat transfer coefficient between flowing air and the absorber (W/m2 K)

\( h_{2} \) :

Convective heat transfer coefficient between flowing air and the bottom surface (W/m2 K)

Ex :

Exergy (W)

\( Ex_{u,p} \) :

Exergy output rate including pressure drop (W)

n :

Number of collectors connected in series

k :

Thermal conductivity (W/m K)

F :

Friction factor

N :

Number of glass covers

Nu :

Nusselt number

Δp :

Difference in pressure (Pa)

ψ:

Exergy efficiency of radiation

α:

Absorptivity

τ:

Transmitivity

φ:

Tilt angle of the collector

η:

Efficiency

Δ:

Thickness (m)

ρ:

Density of fluid (kg/m3)

μ:

Viscosity (N s/m2)

ε:

Emissivity

σ:

Stefan’s constant

a :

Ambient

b :

Bottom

c :

Collector

en :

Energy

ex :

Exergy

f :

Fluid

g :

Glass

i :

Insulation/inlet

m :

Mean

o :

Outlet

p :

Plate

pm :

Pump-motor/mean-plate

r :

Radiation

S :

Sun

t :

Top

w :

Work/wind

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Acknowledgments

The authors are highly grateful to the University of Tabriz for giving all types of support.

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Authors and Affiliations

  1. Department of Agricultural Machinery Engineering, Faculty of Agriculture, University of Tabriz, Tabriz, Iran

    Mahdi Hedayatizadeh, Yahya Ajabshirchi & Hossein Chaji

  2. Faculty of Agriculture, University of Birjand, P.O. Box 97175/331, Birjand, Iran

    Mahdi Hedayatizadeh

  3. Department of Mechanical Engineering, Faculty of Engineering, University of Sistan and Baluchestan, P.O. Box 98164/161, Zahedan, Iran

    Faramarz Sarhaddi & Said Farahat

  4. Department of Mechanical Engineering, Faculty of Engineering, University of Birjand, Birjand, Iran

    Ali Safavinejad

  5. Ministry of Agriculture, Center of Agriculture and Natural Resources of Khorasan Razavi Province, Mashhad, Iran

    Hossein Chaji

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  1. Mahdi Hedayatizadeh
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  2. Yahya Ajabshirchi
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  3. Faramarz Sarhaddi
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  4. Said Farahat
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Correspondence to Mahdi Hedayatizadeh.

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Hedayatizadeh, M., Ajabshirchi, Y., Sarhaddi, F. et al. Analysis of exergy and parametric study of a v-corrugated solar air heater. Heat Mass Transfer 48, 1089–1101 (2012). https://doi.org/10.1007/s00231-011-0957-7

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  • DOI: https://doi.org/10.1007/s00231-011-0957-7

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