228
Table 8.1 (continued)
Surface/material
properties
Symbol
Unit
Range Definition
Reflectance/albedo
Ρ sw
–
0–1
Mean value of albedo
(shortwave)
Thermal conductivity
l l l
= +
(
)
i
p
W.m
−1
.k
−1
>0
The property of a
material’s ability to
conduct heat
λ i : impervious
surface
W-m
−1
.k
−1
>0
Thermal of a material’s
ability to conduct heat
λ p : pervious
surface
W.m
−1
.k
−1
>0
Thermal conductivity
of pervious surface
Specific heat capacity
c = (c i + c p )
J.kg
−1 .k
−1
>0
The amount of heat
required to change a
unit mass of a material
by one degree in
temperature
C i :impervious
surface
J.kg
−1 .k
−1
>0
Specific heat capacity
of impervious surface
C p :pervious
surface
J.kg
−1 .k
−1
>0
Specific heat capacity
of pervious surfaces
Density
ρ = (ρ i + ρ p )
Kg.m
−3
>0
The mass density of a
material is its mass per
unit volume
ρ i :impervious
surface
kg.m
−3
>0
The mass density of
impervious surfaces
ρ p : pervious
surface
Kg.m
−3
>0
The mass density of
pervious surfaces
Anthropogenic heat
output
Q F
W.m
−2
>0
Mean annual heat flux
density from fuel
combustion and human
activity (traffic,
industry, heating and
cooling of buildings
etc.)
Proposed variable for the specification of an urban unit of observation (U2O)
DOCUMENT WP5-UHI-01_112012
WP 5, authors: A, Mahdavi, K. Kiesel, M. Vuckovic (November 5th, 2012)
Main reference:
Mahdavi, A., Kiesel, K., Vuckovic M. (2013). A framework for the evaluation of urban heat island
mitigation measures. SB13 Conference, Munich, Germany.
Stewart, I. D., & Oke T. R. (2012). Local climate zones for urban temperature studies. Bulletin of
the American Meteorological Society.
Unger, J., Savic, S., & Gal, T. (2011). Modeling of the annual mean urban heat island pattern for
planning of representative urban climate station network. Advances in Meteorology, 2011, 1–9.
Hens, H. (2007). Building physics – Heat, air moisture. Ernst & Sohn, Berlin.
F. Musco et al.
Table 8.1 (continued)
Surface/material
properties
Symbol
Unit
Range Definition
Reflectance/albedo
Ρ sw
–
0–1
Mean value of albedo
(shortwave)
Thermal conductivity
l l l
= +
(
)
i
p
W.m
−1
.k
−1
>0
The property of a
material’s ability to
conduct heat
λ i : impervious
surface
W-m
−1
.k
−1
>0
Thermal of a material’s
ability to conduct heat
λ p : pervious
surface
W.m
−1
.k
−1
>0
Thermal conductivity
of pervious surface
Specific heat capacity
c = (c i + c p )
J.kg
−1 .k
−1
>0
The amount of heat
required to change a
unit mass of a material
by one degree in
temperature
C i :impervious
surface
J.kg
−1 .k
−1
>0
Specific heat capacity
of impervious surface
C p :pervious
surface
J.kg
−1 .k
−1
>0
Specific heat capacity
of pervious surfaces
Density
ρ = (ρ i + ρ p )
Kg.m
−3
>0
The mass density of a
material is its mass per
unit volume
ρ i :impervious
surface
kg.m
−3
>0
The mass density of
impervious surfaces
ρ p : pervious
surface
Kg.m
−3
>0
The mass density of
pervious surfaces
Anthropogenic heat
output
Q F
W.m
−2
>0
Mean annual heat flux
density from fuel
combustion and human
activity (traffic,
industry, heating and
cooling of buildings
etc.)
Proposed variable for the specification of an urban unit of observation (U2O)
DOCUMENT WP5-UHI-01_112012
WP 5, authors: A, Mahdavi, K. Kiesel, M. Vuckovic (November 5th, 2012)
Main reference:
Mahdavi, A., Kiesel, K., Vuckovic M. (2013). A framework for the evaluation of urban heat island
mitigation measures. SB13 Conference, Munich, Germany.
Stewart, I. D., & Oke T. R. (2012). Local climate zones for urban temperature studies. Bulletin of
the American Meteorological Society.
Unger, J., Savic, S., & Gal, T. (2011). Modeling of the annual mean urban heat island pattern for
planning of representative urban climate station network. Advances in Meteorology, 2011, 1–9.
Hens, H. (2007). Building physics – Heat, air moisture. Ernst & Sohn, Berlin.
F. Musco et al.