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Factors that infuence theenergy perormance o thebuildings
UNIVERSITATEA TEHNICA DE CONSTRUCTII BUCURESTI
DEPARTAMENTUL DE CERCETARE SI PROIECTARE IN CONSTRUCTII
Bd. Lacul Tei 124 * Sect. 2 * RO!2!"#$ * Bucu%e&ti ROMANIA
Tel.' (4!21242.12.!) Tel.+,a-' (4!21242.!.)1 ///.utc0.%
,uctia%e c3% H5 %. 22"+2!!6 cd 7&cal R1"2$$42
Prof. dr. ing. Vlad IORDACHEProf. dr. ing. Florin IORDACHE
Faculty of Building Services and Eui!"ents
http://www.utcb.ro/http://www.utcb.ro/
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UNIVERSITATEA TEHNICA DE CONSTRUCTII BUCURESTI
DEPARTAMENTUL DE CERCETARE SI PROIECTARE IN CONSTRUCTII
Bd. Lacul Tei 124 * Sect. 2 * RO!2!"#$ * Bucu%e&ti ROMANIA
Tel.' (4!21242.12.!) Tel.+,a-' (4!21242.!.)1 ///.utc0.%
,uctia%e c3% H5 %. 22"+2!!6 cd 7&cal R1"2$$42
B#I$DI%& DESCRIP'IO%
Bloc( of flats ) *$+ s,a!e
- stairells
/ floors
'on0 'o!oloveni
Region0 Arges
Energy !erfor"ance estate0 1adly2"aintainedphoto
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UNIVERSITATEA TEHNICA DE CONSTRUCTII BUCURESTI
DEPARTAMENTUL DE CERCETARE SI PROIECTARE IN CONSTRUCTII
Bd. Lacul Tei 124 * Sect. 2 * RO!2!"#$ * Bucu%e&ti ROMANIA
Tel.' (4!21242.12.!) Tel.+,a-' (4!21242.!.)1 ///.utc0.%
,uctia%e c3% H5 %. 22"+2!!6 cd 7&cal R1"2$$42
-. Building
factorsThermal resistance, absorption
coefficients, transparency
coefficients, glass
surface
3. Arc,itectural
factorsNb. stairwells, nb. floors,
compactness, attic type,
type of basement, unheated
spaces, coefficients A
and Cb
4. Outdoor
factorsOutdoor temperature,
Wind speed, solar radiation,
Depth of groundwater
5. 6aintenance
factorsPenalties
/. E7!loitation
factorsndoor temperature, number of
occupants, ventilation rate,nb. of heating hours,
hot water consumption,
indoor heat sources
8. Installation
factorsType of heating installation,
Duct length, th. resistance
of the pipes, loss ofhot water
PH9SICA$
6ODE$I%&
NP !"#$ NP !"%$ NP !"&
C'!#(',),*,",+,,#
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UNIVERSITATEA TEHNICA DE CONSTRUCTII BUCURESTI
DEPARTAMENTUL DE CERCETARE SI PROIECTARE IN CONSTRUCTII
Bd. Lacul Tei 124 * Sect. 2 * RO!2!"#$ * Bucu%e&ti ROMANIA
Tel.' (4!21242.12.!) Tel.+,a-' (4!21242.!.)1 ///.utc0.%
,uctia%e c3% H5 %. 22"+2!!6 cd 7&cal R1"2$$42
In!ut factors . Sy"1ol 6# 4 3 - 8 /
Thermal resistance of the vertical walls R:PE "3;./8 4.>8 4./8 3.>8 3./8
Th. Resis. of the walls towards dilatation space R:PEr "3;.- >./ >.? >.@ 4.4
Thermal resistance of the flat roof R:'E "3;.5 4 4.8 4.
Thermal resistance floor over basement R:Pd "3;.3 >.? 4.3 4.8 3.3
Thermal resistance of the windows R:FE "3;.4 >.8 >.? 4 4.-
Absorption coefficient of the vertical walls a1s PE 2 >.4 >.3/ >.8 >.// >.?
Absorption coefficient of the flat roof a1s 'E 2 >.8 >./3 >.5/ >.?? >.@
Transparency coefficient of the windows 2 >.45 >.3 >.33 >.35 >.-
Percentage of the sunny side of the envelope cs 2 >.4 >.- >./ >.? >.@
Window surface &S 7Sutil ? 4> 4/ 3> 3/
Air changes per hour na4 <
, >./ >./ 4.3 4.// 4.@
Indoor heat sources a =
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UNIVERSITATEA TEHNICA DE CONSTRUCTII BUCURESTI
DEPARTAMENTUL DE CERCETARE SI PROIECTARE IN CONSTRUCTII
Bd. Lacul Tei 124 * Sect. 2 * RO!2!"#$ * Bucu%e&ti ROMANIA
Tel.' (4!21242.12.!) Tel.+,a-' (4!21242.!.)1 ///.utc0.%
,uctia%e c3% H5 %. 22"+2!!6 cd 7&cal R1"2$$42
In!ut factors . Sy"1ol 6# 4 3 - 8 /
Thermal resistance of the vertical walls R:PE "3;./8 4.>8 4./8 3.>8 3./8
Th. Resis. of the walls towards dilatation space R:PEr "3;.- >./ >.? >.@ 4.4
Thermal resistance of the flat roof R:'E "3;.5 4 4.8 4.
Thermal resistance floor over basement R:Pd "3;.3 >.? 4.3 4.8 3.3
Thermal resistance of the windows R:FE "3;.4 >.8 >.? 4 4.-
Absorption coefficient of the vertical walls a1s PE 2 >.4 >.3/ >.8 >.// >.?
Absorption coefficient of the flat roof a1s 'E 2 >.8 >./3 >.5/ >.?? >.@
Transparency coefficient of the windows 2 >.45 >.3 >.33 >.35 >.-
Percentage of the sunny side of the envelope cs 2 >.4 >.- >./ >.? >.@
Window surface &S 7Sutil ? 4> 4/ 3> 3/
Air changes per hour na4 <
, >./ >./ 4.3 4.// 4.@
Indoor heat sources a =
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UNIVERSITATEA TEHNICA DE CONSTRUCTII BUCURESTI
DEPARTAMENTUL DE CERCETARE SI PROIECTARE IN CONSTRUCTII
Bd. Lacul Tei 124 * Sect. 2 * RO!2!"#$ * Bucu%e&ti ROMANIA
Tel.' (4!21242.12.!) Tel.+,a-' (4!21242.!.)1 ///.utc0.%
,uctia%e c3% H5 %. 22"+2!!6 cd 7&cal R1"2$$42
In!ut factors . Sy"1ol 6# 4 3 - 8 /
Thermal resistance of the vertical walls R:PE "3;./8 4.>8 4./8 3.>8 3./8
Th. Resis. of the walls towards dilatation space R:PEr "3;.- >./ >.? >.@ 4.4
Thermal resistance of the flat roof R:'E "3;.5 4 4.8 4.
Thermal resistance floor over basement R:Pd "3;.3 >.? 4.3 4.8 3.3
Thermal resistance of the windows R:FE "3;.4 >.8 >.? 4 4.-
Absorption coefficient of the vertical walls a1s PE 2 >.4 >.3/ >.8 >.// >.?
Absorption coefficient of the flat roof a1s 'E 2 >.8 >./3 >.5/ >.?? >.@
Transparency coefficient of the windows 2 >.45 >.3 >.33 >.35 >.-
Percentage of the sunny side of the envelope cs 2 >.4 >.- >./ >.? >.@
Window surface &S 7Sutil ? 4> 4/ 3> 3/
Air changes per hour na4 <
, >./ >./ 4.3 4.// 4.@
Indoor heat sourcesa =
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UNIVERSITATEA TEHNICA DE CONSTRUCTII BUCURESTI
DEPARTAMENTUL DE CERCETARE SI PROIECTARE IN CONSTRUCTII
Bd. Lacul Tei 124 * Sect. 2 * RO!2!"#$ * Bucu%e&ti ROMANIA
Tel.' (4!21242.12.!) Tel.+,a-' (4!21242.!.)1 ///.utc0.%
,uctia%e c3% H5 %. 22"+2!!6 cd 7&cal R1"2$$42
!
!,+
'
',+
! ' ) *-P/ 0m
)1(W2
R m a [ m 2 K
/ W ]
> >3/ >/ >?/ 4
R:PE 2
2->24>
4>
28>
23>
>
3>
R m a ( % ) A7is
c,ange
Horiontal a7is9
Dimensionless parameter
Vertical a7is0
:ariation of the energyperformance inde;
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>.3/ >./ >.?/ 4
-=P/ 0
>.3/ >./ >.?/ 4
-=P/ 0
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UNIVERSITATEA TEHNICA DE CONSTRUCTII BUCURESTI
DEPARTAMENTUL DE CERCETARE SI PROIECTARE IN CONSTRUCTII
Bd. Lacul Tei 124 * Sect. 2 * RO!2!"#$ * Bucu%e&ti ROMANIA
Tel.' (4!21242.12.!) Tel.+,a-' (4!21242.!.)1 ///.utc0.%
,uctia%e c3% H5 %. 22"+2!!6 cd 7&cal R1"2$$42
2/>
28>
2->
23>
24>
>
4>
3>
> >3 >8 >5 > 4
In!ut factor 2
R " a D B E
RPEr R'ERPdcs a1s PE a1s 'E
cs&Snaati
RPdRFERPIcsRPE
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UNIVERSITATEA TEHNICA DE CONSTRUCTII BUCURESTI
DEPARTAMENTUL DE CERCETARE SI PROIECTARE IN CONSTRUCTII
Bd. Lacul Tei 124 * Sect. 2 * RO!2!"#$ * Bucu%e&ti ROMANIA
Tel.' (4!21242.12.!) Tel.+,a-' (4!21242.!.)1 ///.utc0.%
,uctia%e c3% H5 %. 22"+2!!6 cd 7&cal R1"2$$42
2/>
28>
2->
23>
24>
>
4>
3>
->
8>/>
5>
?>
>
@>4>>
> >3 >8 >5 > 4
In!ut factor 2
I % C D B
E
naRPE
tiaRFE RPEr R'E RPIcsRPdcs RPd a1s PE a1s 'E
cs
&S
UNIVERSITATEA TEHNICA DE CONSTRUCTII BUCURESTI
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UNIVERSITATEA TEHNICA DE CONSTRUCTII BUCURESTI
DEPARTAMENTUL DE CERCETARE SI PROIECTARE IN CONSTRUCTII
Bd. Lacul Tei 124 * Sect. 2 * RO!2!"#$ * Bucu%e&ti ROMANIA
Tel.' (4!21242.12.!) Tel.+,a-' (4!21242.!.)1 ///.utc0.%
,uctia%e c3% H5 %. 22"+2!!6 cd 7&cal R1"2$$42
CO%C$#SIO%S
Parameters that ha?e ,ig, influence upon the heat
consumption of the building RPE RFE ti a na
Parameters that ha?e reduced influence upon the heat
consumption of the building
RPEr R'E RPIcs RPDcs RPD a1s PE a1s 'E cs &S
Relative generality