II. Thermal insulation design for the envelop elements ( Proiectarea higrotermică a anvelopei clădirii)

The equation used for the thermal resistance estimation in the hypothesis of one direction thermal flux is:

[m2K/W] (1)

Atentie:Din condiţia de economie de energie:

1. R0,ef Rmin (3)

In care :R’min - rezistenta termica minima normata,Rmin =(1,2 … 1,3)Rmin

cu Rmin – valoarea minimă normată a rezistenţei termice medii corectate a întregului element de construcţie din anvelopă, pe ansamblul clădirii.

Observatii:Deoarece in tabelele de mai jos se dau valorile minime ale rezistentelor medii corectate pe tipuri de elemente si ansamblul clădirii, pentru predimensionarea termoizolaţiei vom considera ca punţile termice aferente elementelor de construcţie reduc rezistenţe termica din câmp curent cu 20%...30%.

Thermal characteristics of the materials used in the construction of the envelope:

Nr. Material

Density

Thermal conductivity

Thermal receptivity

Sm

Vapour permeability resistance

1/KD

Kg/m3 W/(mk) W/(m2k) -0 1 2 3 4 51 Reinforced concrete 2500 1,74 16,25 21,632 Reinforced concrete 2400 1,62 15,36 21,33 Cement/lime plaster 1700 0,87 4,47 8,54 Plaster over insulation 1200 0.52 3.15 4.75 Mineral wool 100/130 0,048 0,50 1,36 Polystyrene 20 0,044 0,29 30,07 Cardboard plaster 700 0,23 3,13 3,48 Sand infilling 1600 0,58 7,50 3,9

10 Gravel infilling 1800 0,70 8,74 2,411 Aerated concrete (b.c.a.)

masonry with slim joints675 0,27 3,38 3,8

12 Aerated concrete strips 625 0,25 3,13 3,713 Fir timber 550 0,17 4,12 10,414 Oak and beech timber 800 0,23 5,78 11,315 PFL board 300 0,07 1,95 2,716 Bituminous cardboard 600 0,17 3,28 -

REZISTENTELE TERMICE ALE STRATURILOR DE AER

NEVENTILATE

Grosimea stratului de aer

Directia si sensul fluxului termic

OrizontalVertical

Ascendent descendent0 0,00 0,00 0,005 0,11 0,11 0,117 0,13 0,13 0,1310 0,15 0,15 0,15

15 0,17 0,16 0,1725 0,18 0,16 0,19

50 0,18 0,16 0,21100 0,18 0,16 0,22

300 0,18 0,16 0,23

OBSERVATIE: Pentru valori intermediare se interpolează liniar

Other necessary information :

Surface heat loss factors: i and e:

Working condition factor:

1. External walls type I (cross shear wall):

i=8, e=23

Nr. Material Layer Thickness

Therm. conduct.

Therm. asim. factor

Heat loss resist.

Vapour conductiv.

    d Sm R 1/KD

(m) (W/mK) (W/m2K) (m2K/W) -1/i

1Internal Cement / lime plaster

2 Reinforced concrete

3Polystyrene / mineral wool/ polyurethane X

4 External plaster

1/e

Total on element R=

External walls: type II

Nr. Material Layer Thickness

Therm. conduct.

Therm.asim. factor

Heat loss

resist.

Vapour conductiv.

    d Sm R 1/KD

(m) (W/mK) (W/m2K) (m2K/W) -1/i

1Internal Cement / lime plaster

2 Brick masonry

3Polystyrene / mineral wool/ polyurethane X

4 External plaster

1/e

Total on element R=

2. Top floor (terrace roof) :

1- waterproof membrane protection (mortar 3 cm + gravel or concrete boards); 2 – waterproof membrane; 3 –diffusive layer; 4 – waterproof membrane support (mortar 3 cm); 5 – plistyrene termo-insulation 20 cm; 6 – diffusion layer;7 –vapor barrier;8 – sloping layer (b.c.a.) 8 cm; 9 – reinforced concrete floor slab – 12…15 cm; 10 – ceiling plaster - 1,5 cm;

3. Floor over the basement:

floor over basement:1- ceiling plaster - 1,5 cm;2- thermal insulation of mineral wool – 10 cm; 3- reinforced concrete floor slab – 12…15 cm;4- mortar bead – 3 cm5 – Ceramic floor tile – 1.2 cm

Adrese utile: <http://www.wienerberger.ro/servlet/Satellite?pagename=Wienerberger/Page/List05&c=Page&cid=1139915658675&sl=wb_ro_home_ro > , < http://www.brikston.ro/produse/>, <http://www.metaleinternational.ro/index.php?pag_index=9&id=307>,<http://www.elpreco.ro/download/zidarie/Fisa_tehnica_BCA_zidarie.pdf>,< http://www.elpreco.ro/download/zidarie/Catalog_sistem_zidarie_cu_rosturi_subtiri_-_ %20BCA.pdf

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