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6 SYMBOLS AND UNITS

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6

SYMBOLS AND UNITS

Symbol Unit Description

A

m

2 Area, surface

A

he1

m

2 Surface of the pipeline

A

he2

m

2 Surface of the pipeline

c

p

J/kgK

Specific heat at constant pressure

c

p,st

J/kgK

Steel specific heat at constant pressure

c

v

J/kgK

Specific heat at constant volume

h

conv

W/m

2

K

Convective heat transfer coefficient

K

[-]

Pressure loss coefficient

M

st

kg

Mass of steel

R

J/kgK

Ideal gas constant

T

K

Temperature

T

ml

[-]

Logarithmic mean temperature difference

P

Pa

Pressure

V

m

3 Volume

w

m

2

/s

Speed

ε

[-]

Emissivity

σ

Wm

-2

K

-4 Stefan-Boltzmann’s constant

τ

s

Delay/time constant

XX

av Average value of parameter/variable XX

XX

ext Parameter/variable XX evaluated externally

XX

int Parameter/variable XX evaluated internally

XX

env Parameter/variable XX evaluated for the environment

XX

ref Reference value of XX variable

Riferimenti

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