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Comparative study of three different designs of a hybrid PV/T double-pass finned plate solar air heater

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Abstract

In this paper, three different designs of a hybrid PV/T double-pass finned plate solar air heater (DPFPSAH) are investigated. The PV module is used to produce electricity needed to run the pump and blow the air into the solar collector. In the first design, the PV module is placed on the absorber plate of the air heater. In the second design, the PV module is placed beside the glass cover of the air heater; while, in the third one, the PV module is completely separated from the solar collector. The effects of mass flow rate of air, flow, and fan pumping powers are studied. The top losses of the third design are found to be higher than that of the first and the second designs by average values of 7.5% and 29%, respectively. The third design of the hybrid systems has the highest overall performance. The daily thermal efficiencies of the first, second, and third designs of the hybrid systems are obtained as 53%, 27%, and 64%, respectively, at mass flow rate of 0.02 kg/s.

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Abbreviations

A :

Surface area (m2)

b :

Width of the heater (m)

c :

Specific heat (J/kg K)

d :

Depth of air channel (m)

dx :

Unit length (m)

D h :

Hydraulic diameter (m)

f :

Friction factor

H :

Height of the fin (m)

h :

Heat transfer coefficient (W/m2 K)

I :

Solar radiation intensity (W/m2)

k :

Thermal conductivity (W/m K)

L :

Length of heater (m)

\( \dot{m} \) :

Mass flow rate of air (kg/s)

Nu :

Nusselt number (dimensionless)

P :

Power (W)

∆P :

Pressure drop (N/m2)

\( \dot{Q_u} \) :

Thermal output power (W)

\( \dot{Q_p} \) :

Electrical output power (W)

Re :

Reynolds number (dimensionless)

T :

Temperature (K)

t :

Thickness of the fin (m)

U t :

Top heat losses coefficient (W/m2 K)

V :

Velocity (m/s)

x :

Thickness of insulating material (m)

Pr :

Prandtl number (dimensionless)

t :

Thickness of the fin (m)

\( {\dot{Q}}_{useful} \) :

Useful electrical power (W)

\( {\dot{Q}}_{NET} \) :

Net available electrical power (W)

a :

Ambient

av :

Average

b :

Back

c :

Convective

f :

Fluid

g :

Glass

i :

Inlet

l :

Lower

o :

Outlet

p :

Absorber plate

r :

Radiative

s :

Sky, side

w :

Wind

u :

Upper

fr :

Forced convection mode

m :

Module

α :

Absorptivity

τ :

Transmissivity

η :

Efficiency

η c :

Efficiency of the solar cell (dimensionless)

η fin :

Efficiency of the fins (dimensionless)

η T − d :

Daily thermal efficiency (dimensionless)

η E :

Electrical efficiency (dimensionless)

η overall :

Overall efficiency (dimensionless)

η e − h :

The electrohydraulic efficiency (dimensionless)

ρ :

Density (kg/m3)

μ :

Dynamic viscosity (kg/m s)

ϕ :

Dimensionless quantity

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Correspondence to Mohammed Mossad Hegazy.

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Hegazy, M.M., El-Sebaii, A., Ramadan, M.R. et al. Comparative study of three different designs of a hybrid PV/T double-pass finned plate solar air heater. Environ Sci Pollut Res (2020) doi:10.1007/s11356-019-07487-8

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Keywords

  • Hybrid PV/T system
  • Thermal efficiency
  • Pumping power
  • PV module