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Heat Transfer Mechanisms in PCM-Based Building Envelope Systems

  • Benjamin DurakovićEmail author
Chapter
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Part of the Green Energy and Technology book series (GREEN)

Abstract

To describe physical processes and predict performances of passive buildings, various mathematical models have been developed based on numerical and experimental studies. This chapter is a useful reference for researches, academicians, professionals, and students regarding the passive building design in terms of energy storage within PCM, heat transfer through building envelope as well as airflow rate through a solar chimney.

Nomenclature

.

C

Coefficient

g

Gravity acceleration, m/s2

U

Overall heat transfer coefficient/U-factor, W/m2 K

H

Height, m

A

Area, m2

cp

Specific heat, J/kg °C

T

Temperature, °C

h

Convective heat transfer coefficient, W/m2 K

β

Fraction of melted PCM

m

Mass, kg

\(\dot{q}\)

Heat flux in positive direction, W/m2

\(\dot{Q}\)

Heat flow, W

\(\dot{q}\)

Heat flux, W/m2

I

Solar irradiance, W/m2

E

Energy, J

σ

Stefan–Boltzmann constant (σ = 5.67 × 10−8 W/m2 K4)

ε

Surface emissivity

λ

Thermal conductivity of material, W/m K

\(\dot{E}\)

Rate of heat, W

\(\dot{e}\)

Rate of heat, W/m3

α

Thermal diffusivity, m2/s

ρ

Density, kg/m3

L

Thickness/length, m

u

Velocity in x-direction, m/s

v

Velocity in y-direction, m/s

w

Velocity in z-direction, m/s

F

Force

τ

Shear stress tensor, Pa

\(\hat{\tau }\)

Transmissivity of the surface

t

Time, s

μ

Dynamic viscosity of the liquid phase, Pa s

ψj

Linear heat transfer coefficient, W/m K

χk

Dotted heat transfer coefficient, W/m K

p

Number of dotted connections.

Abbreviations

PCM

Phase change material

LHES

Latent heat energy storage

SHES

Sensible heat energy storage.

Subscripts

i

Interior

e

Exterior

s

Surface

surr

Surrounding

in

Inlet

out

Outlet

is

Interior side

d

Discharge

sc

Solar chimney

pc

Phase change

cond

Conduction

conv

Convection

R

Radiation

c

Convection

T

Total

cv

Control volume

gen

Generated

stored

Stored

tot

Total.

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Copyright information

© Springer Nature Switzerland AG 2020

Authors and Affiliations

  1. 1.Faculty of Engineering and Natural SciencesInternational University of SarajevoSarajevoBosnia and Herzegovina

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