Theoretical Analysis of Overall Heat Loss Coefficient in a Flat Plate Solar Collector with an In-Built Energy Storage Using a Phase Change Material

Conference paper
Part of the Lecture Notes in Mechanical Engineering book series (LNME)

Abstract

Flat Plate Solar Heater is one of the most widely used devices to harness solar energy available in abundance. The collector efficiency can be improved by reducing the overall losses. Efficiency of the collector depends on overall loss coefficient which is the sum of Top loss, Bottom loss and edge loss. The present theoretical analysis is on Overall Heat Loss Coefficient of a solar collector with and without in-built Phase Change Material (PCM). Theoretical results show a reduction in Overall loss coefficient with decrease in distance between the absorber plate and PCM surface, and decrease in mean absorber plate temperature.

Keywords

PCM Top loss coefficient Overall loss coefficient and efficiency 

Nomenclature

Ac

Collector area (m2)

cp

Specific heat capacity (Jkg−1k−1)

I

Intensity of solar radiation (Wm−2)

S

Solar radiation reaching the absorber plate (Wm−2)

L

Number of glass covers

M

Mass flow rate (Kgs−1)

T

Temperature (K)

hw

Wind loss coefficient (Wm−2K−1)

UL

Overall heat loss coefficient (Wm−2K−1)

UT

Top loss coefficient (Wm−2K−1)

UB

Bottom loss coefficient (Wm−2K−1)

UE

Edge loss coefficient (Wm−2K−1)

QT

Top heat loss (W)

QB

Bottom heat loss (W)

QE

Edge heat loss (W)

Qo

Is the heat loss (W)

Qu

Useful heat energy collected (W)

FR

Collector heat removal factor

F

Collector efficiency factor

Greek

α

Absorptive

τ

Transitivity

η

Efficiency

σ

Stefan Boltzmann’s constant = (5.67 × 10−8 Wm−2K−4)

β

Collector tilt angle

Subscripts

a

Ambient

c

Collector

i

Inlet

o

Outlet

g

Glass cover

p

Absorber plate

References

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  3. 3.
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  6. 6.
    Varol Y, Koca A, Oztop HF, Avci E (2010) Forecasting of thermal energy storage performance of phase change material in a solar collector using soft computing techniques. Expert Syst Appl 37:2724–2732CrossRefGoogle Scholar

Copyright information

© Springer India 2012

Authors and Affiliations

  1. 1.Department of Mechanical EngineeringMAM College of Engineering and TechnologyTiruchirapalliIndia
  2. 2.Department of Mechanical EngineeringRoever Engineering CollegePerambalurIndia

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