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Performance investigation of a solar thermal collector provided with air jets impingement on multi V-shaped protrusion ribs absorber plate

  • Raj KumarEmail author
  • Rahul Nadda
  • Adit Rana
  • Ranchan Chauhan
  • S. S. Chandel
Original

Abstract

In the present work, the heat transfer through a solar thermal collector (STC) provided with jet air impingement on the absorbent plate fitted with multi V-shaped protrusion ribs is investigated experimentally. The investigation is carried out for geometric parameters such as Relative width ratio (WPR/WAPR), Relative protrusion rib height (hPR/dPR), Relative pitch ratio (PPR/hPR), Angle of attack (αPR) respectively. The values of the streamwise pitch ratio (XSW/dh) = 0.40, spanwise pitch ratio (YSW/dh) = 0.85 and jet diameter ratio (dj/dh) = 0.064 are kept constant. The overall performance of STC is effectively evaluated by varying Reynolds number (Re) in the range 2500–35,000. The results obtained from the experiments shows that the impingement jets flow on multi V-shaped protrusion ribs absorber plate accelerated the heat transfer through the solar collector channel. The optimal augmentation is obtained at WPR/WAPR= 5, hPR/dPR= 0.9, PPR/hPR = 8 and αPR = 65° respectively. Thermal-hydraulic performance parameter ( ηPR) has also been investigated and the maximum value of 3.44 is obtained for the range of parameters studied.

Nomenclature and abbreviations

Ap

Surface area of the heated plate, m2

Ao

Area of the orifice, m2

Cd

Coefficient of discharge

Cf

Specific heat of fluid, J/kgK

dh

Hydraulic diameter of the channel, m

dj/dh

Jet diameter ratio

dj

Diameter of the jet, m

fr

Friction factor of roughened protrusion rib

fss

Friction factor of the smooth surface

ht

Convective heat transfer coefficient, W/m2K

HC

Height of the channel, m

hPR

Height of the protrusion rib, m

hPR/dPR

Relative protrusion rib height

Kf

Thermal Conductivity of fluid, W/mK

Lt

Length of the test section, m

Lv

Length of V-shaped protrusion rib, m

ma

Mass flow rate of fluid, kg/s

Nu

Nusselt number of rough fund surface

Nuss

Nusselt number of the surface without protrusion

PPR

Pitch of protrusion rib, m

PPR/hPR

Relative pitch ratio

(p)d

Pressure fall across test section, Pa

(p)o

Pressure fall across orifice plate, Pa

Qu

Useful heat achieve, W

Re

Reynolds number of flowing fluid

Tf

Average temperature of the fluid, K

Ti

Inlet temperature of the fluid, K

To

Outlet temperature of the fluid, K

Tp

Plate temperature of fluid, K

U

Mean fluid velocity, m/s

UL

Overall heat loss coefficient

V

Velocity of fluid, m/s

WPR/HC

Channel aspect ratio

WPR

Width of protrusion channel, m

WVPR

Width of a single V-protrusion rib, m

WPR/WAPR

Relative width ratio

XSW/dh

Streamwise variation

YSW/dh

Spanwise variation

STC

Solar thermal collector

SAC

Solar air channel

SAH

Solar air heater

THP

Thermo-hydraulic performance

Re

Reynolds Number

Greek symbols

αPR

Angle of attack,°

βR

Ratio of orifice meter to pipe diameter, No dimension

ρf

Density of fluid, kg/m3

νa

Kinematic viscosity of fluid, m2/s

ηPR

Thermo-hydraulic performance parameter

Notes

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

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Copyright information

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

Authors and Affiliations

  • Raj Kumar
    • 1
    Email author
  • Rahul Nadda
    • 2
  • Adit Rana
    • 1
  • Ranchan Chauhan
    • 3
  • S. S. Chandel
    • 1
  1. 1.Faculty of Engineering and TechnologyShoolini UniversitySolanIndia
  2. 2.Department of Mechanical EngineeringIndian Institute of Technology RoparRupnagarIndia
  3. 3.Department of Mechanical EngineeringDr. B.R. Ambedkar NITJalandharIndia

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