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Heat transfer enhancement in a hybrid PV cell-cooling tower

  • Nasrin Abdollahi
  • Masoud RahimiEmail author
  • Nooshin Karami
  • Mohsen Abdollahi
Original

Abstract

This research has been conducted with the purpose of finding an innovative and environmentally friendly means of cooling for a photovoltaic (PV) solar cell to overcome the common obstacle that hinders PVs to be widely used. A small scale cooling tower was devised and fabricated that works based on evaporation cooling. To optimize the cooling performance, the effect of water flow rate and wind speed were investigated. The experiments were conducted at three different water flow rates with and without considering wind. The average PV cell temperature and the percentage increase in electrical output regarding the reference state of without cooling at each wind speed were measured. After introducing water to the back of the PV cell, the measured value of surface temperature followed a downward trend with a steep slope at lower flow rates. The results showed a significant rise of 44.83% in PV electrical efficiency at the highest flow rate when there is no wind. However, this enhancement reduced to 21.49% and 19.49% for wind speed of 2 m/s and 3.5 m/s, respectively. The net evaporation rate was also calculated for each case to explain the reasons for the observed trends. Finally the feasibility study of the cooling system was conducted and it was found that the proposed cooling system was efficient and practical.

Keywords

Cooling tower Photovoltaic cell Electrical power Heat transfer enhancement Wind speed 

Nomenclature

Q

volumetric flow rate (mL/s)

T

Temperature

ΔT

Temperature difference

V

velocity (m/s)

D

diameter (m)

h

head (m)

PPV,withoutcooling

reference Power (w)

p

pressure (mbar)

Ppump

pump consumption power(pa.m3/s)

Voc

Open-circuit voltage

Isc

Short-circuit current

Pmax

maximum power of photovoltaic (W)

Z

elevation (m)

C

specific heat at constant pressure (J/kg.0C)

Abbreviations

COE

Coefficient of energy

PV

Photovoltaic

Greek letters

ρ

density (kg/m3)

λ

latent heat of evaporation (J/Kg)

γ

specific weight (N/m3)

η

efficiency

Subscripts

w

water

in

inlet

out

outlet

pv

photovoltaic

p

pump

f

Friction

Notes

Compliance with ethical standards

Conflict of interest

On behalf of all authors, the corresponding author states that there is no conflict of interest.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Nasrin Abdollahi
    • 1
  • Masoud Rahimi
    • 1
    Email author
  • Nooshin Karami
    • 1
  • Mohsen Abdollahi
    • 1
  1. 1.CFD research center, Oil and Petrochemical FacultyRazi UniversityKermanshahIran

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