3 PERM 08 Factori

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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

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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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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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-. 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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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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, >./ >./ 4.3 4.// 4.@

Indoor heat sources a =


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, >./ >./ 4.3 4.// 4.@

Indoor heat sourcesa =


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!

!,+

'

',+

! ' ) *-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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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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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



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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

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3 PERM 08 Factori