Calculul La Condens-acoperis Terasa Necirculabila

  • June 2020
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CALCULUL LA CONDENS – ACOPERIŞ –TERASĂ NECIRCULABILĂ BOTOŞANI ⇒ Ti=200C ⇒ Te=─210C ⇒ φi=55 % ⇒ φe=55 % Caracteristici ternofizice Nr. Denumirea stratului de crt. material

1

1 Suprafaţa interioară tencuială tavan

2

planşeu b.a

3

şapă egalizare M100

4 5

barieră vap. 2c+3b şapă M100

6 7

strat difuzie1cp şapă M100

8

termoizolaţie polist.

9

şapă egalizatoare

10 11

hidroizolaţie 3c+4b nisip Suprafaţă exterioară

d (m) 2 0.0 1 0.1 3 0.0 3 — 0.0 3 — 0.0 3 0.1 5 0.0 3 — 0.0 2

Conductivitate termică de calcul λ (N/m*k) 3

1/kD

0.87

R şi R=d/λ; Rse (m2k/w) 4 0.123 0.01

8.5

Tsi=18.780C T1=18.70C

1.74

0.075

21.3

T2=17.930C

0.93

0.032

7.1

T3=17.60C



— 0.032

6.0 7.1

T4=17.60C T5=17.30C

— 0.93

— 0.032

— 7.1

T6=17.30C T7=11.30C

0.04

3.75

20

T8=-17.870C

0.93

0.032

7.1

T9=-20.50C

8

Tse=-20.50C

0.93

— —

— — 0.043

5

— Te=–210C

Ti −Te 20 + 21 *Rsi=20*0.123=18.780C R 4.129 Ti −Te 20 + 21 T1=Ti*(Rsi+R1)=20*(0.123+0.01)=18.70C R 4.129 Ti −Te 20 + 21 T2=Ti*(Rsi+R1+R2)=20*(0.123+0.01+0.075)=17.930C R 4.129 Ti −Te 20 + 21 T3=Ti*(Rsi+R1+R2+R3)=20*(0.123+0.01+0.075+.0032)=17.60C R 4.129 Ti −Te 20 + 21 T4=Ti*(Rsi+R1+R2+R3)=20*(0.123+0.01+0.075+.0032)=17.60C R 4.129

Tsi =Ti-

T5=Ti-

Ti −Te 20 + 21 *(Rsi+R1+R2+R3+R5)=20R 4.129

*(0.123+0.01+0.075+.0032+0.032)=17.30C T6=Ti-

Ti −Te 20 + 21 *(Rsi+R1+R2+R3+R5)=20R 4.129

*(0.123+0.01+0.075+.0032+0.032)=17.30C T7=Ti-

Ti −Te 20 + 21 *(Rsi+R1+R2+R3+R5+R7)=20R 4.129

*(0.123+0.01+0.075+.0032+0.032+0.032)=11.30C T8=Ti-

Ti −Te 20 + 21 *(Rsi+R1+R2+R3+R5+R7+R8)=20R 4.129

*(0.123+0.01+0.075+.0032+0.032+0.032+3.75)=-17.870C T9=Ti-

Ti −Te 20 + 21 *(Rsi+R1+R2+R3+R5+R7+R8+R9)=20R 4.129

*(0.123+0.01+0.075+.0032+0.032+0.032+3.75+0.032)=-20.50C Verificări la condens pe suprafaţa interioară Tsi- temperatura suprafeţei interioare a terasei δr - temperatura de rouă Tsi > δr δr = f(Ti,φi)=f(200C, φi=55T0)=10.70C Tsi=18.780C>δr=10.70C ⇒ pe suprafaţa interioară nu se formează condens Verificări la condens în structura elementului -

temperaturile medii ale straturilor

Tsi + T1 18 .78 = 18 .7 = 18.740C ⇒ M1g=51.81*108 = 2 2 T + T2 18 .7 +17 .9 =18.30C ⇒ M2=51.88*108 T2med= 1 = 2 2 T + T3 17 .9 +17 .6 =17.750C ⇒ M3=51.96*108 T3med= 2 = 2 2 T + T4 17 .6 +17 .6 =17.60C ⇒ M4=51.99*108 T4med= 3 = 2 2 T4 + T5 17 .6 +17 .3 = 17.450C ⇒ M5=52*108 T5med= = 2 2 T6med=T5=17.3 17.450C ⇒ M6=52.03*108 T + T7 17 .3 −11 .3 =14.30C ⇒ M7=52.48*108 T7med= 5 = 2 2 T7 + T8 11 .3 −17 .87 = -3.280C ⇒ M8=55.19*108 T8med= = 2 2

T1med=

=

T8 + T9 17 .87 − 20 .5 =-19.20C ⇒ M9=57*108 = 2 2 Tmed=T9=-20.50C ⇒ M10=58.26*108

T9med=

Presiuni de saturaţie pvi=

N p si * ϑi 2339 * 55 = =1286 2 100 m 100

pve=

N p se * ϑe 94 * 85 = =79.9 2 100 m 100

Ti=200C Tsi=18.780C T1=18.70C T2=17.930C T3=17.60C T4=17.60C T5=17.30C T6=17.30C T7=11.30C T8=-17.870C T9=-20.50C Tse=-20.50C Te=-210C

psi=2339N/m2 pssi=2171 N/m2 ps1=2159 N/m2 ps2=2052 N/m2 ps3=2013 N/m2 ps4=2013 N/m2 ps5=1975 N/m2 ps6=1975 N/m2 ps7=1340 N/m2 ps8=125 N/m2 ps9=99 N/m2 psse=99 N/m2 pse=94 N/m2

STAS 6472 Nr. 1 2 3 4 5 6 7 8 9 10 •

Strat - denumire

d. 0.01 0.13 .003

BV 0.03

1/kD 8.5 21.3 7.1 6.0 7.1

SD 0.03 0.15 0.03 H Total Rv

7.1 20 7.1 8

Mg/108 51.81 51.88 51.96 51.99 52 52.03 52.48 55.19 57 58.26

Rv /108 4.404 143.7 11.07 311.94 11.07 11.18 165.57 12.14 466.08

În perioada sezonului rece apare condens în structura terasei – pe o zonă de condens. ⇒ este necesară verificarea:

-

lipsei acumulării de apă de la an la an calculul cantităţi de apă acumulată în perioada de condensare

Ps,v [N/m2]

1

2

3

4

5-7

8

9

10

2400 2200 2000 1800 1600 1400 1200 1000 800 600 400 Rv/108 [m/s]

200 200

400

600

800

1000

1200

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