POLITECHNIKA ŚWIĘTOKRZYSKA KIELCE, dn 26.05.07 |
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WYDZIAŁ BUDOWNICTWA I INŻYNIERII ŚRODOWISKA |
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KATEDRA WODOCIĄGÓW I KANALIZACJI |
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Wentylacja i Ogrzewnictwo |
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ĆWICZENIE PROJEKTOWE NR 2 |
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Z PRZEDMIOTU FIZYKA BUDOWLI |
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Artur CHRZANOWSKI |
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Grupa 404 OW |
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Nr |
17 |
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Zadanie 1 |
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Oblicz straty ciepła w pomieszczeniu znajdującym się w domu parterowym z poddaszem |
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nieużytkowym, zokalizowanym w Kielcach. Dom wykonano z drewna. Uwzględnić istnienie |
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mostka cieplnego na wysokości nadproża. Samodzielnie dobrać okna. |
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DANE |
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λw = |
0,04 |
W/m*K |
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λd = |
0,15 |
W/m*K |
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a = |
5 |
m |
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b = |
4 |
m |
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d = |
0,037 |
m |
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e = |
0,151 |
m |
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f = |
0,5 |
m |
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a) względne pola powierzchni wycinka |
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fw = |
0,768 |
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fb = |
0,232 |
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b) opór przejmowania ciepła dla poziomego strumienia ciepła |
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RTe=Rsi+R1+R2+R3+Rse |
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- dla belki |
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RSi = |
0,13 |
[m2*K/W] |
- wartości odczytane z normy |
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RSe = |
0,04 |
[m2*K/W] |
- wartości odczytane z normy |
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R1 = R3 = d/λd = |
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0,25 |
[m2*K/W] |
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[m/(W/m*K)] => [m2*K/W] |
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R2 = e/λd = |
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1,01 |
[m2*K/W] |
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RTe = |
1,67 |
[m2*K/W] |
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RTf=RSi+R1+R2+R3+RSe |
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R2 = e/λW = |
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3,78 |
[m2*K/W] |
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RTf = |
4,44 |
[m2*K/W] |
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c) kres górny calkowitego oporu cieplnego |
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1/RT = fW/RTf+fb/Rte = 1/RT' |
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1/RT' = |
0,312 |
W/m2*K |
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RT' = |
3,206 |
m2*K/W |
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d) kres dolny; zastępcza przewodność cieplna |
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λ'' = λd*fb+λW*fW |
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λ'' = |
0,066 |
W/m*K |
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RT'' = RSi+R1+R''λ+R3+Rse |
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Rλ'' = e/λ'' |
Rλ'' = |
2,30 |
m2*K/W |
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[m/(W/m*K)] => [m2*K/W] |
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RT'' = |
2,97 |
m2*K/W |
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e) całkowity opór cieplny dla komponentu |
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RT = (R'T+R''T)/2 |
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RT = |
3,09 |
m2*K/W |
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U = 1/RT |
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U = |
0,32 |
W/m2*K |
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f) współczynnik przenikania ciepła dla przegród z mostkami cieplnymi |
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gdzie: |
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Ψ - współczynnik peznikania ciepła (dla nadproża izolacja niezachodzi na ościeżnice) |
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Ψ = |
0,29 |
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L - długość mostka cieplnego nadproża |
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L = |
1,8 |
m |
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A - pole powierzchni przegrody, gdzie znajduje się okno |
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Zapotrzebowanie na ciepło dla poszczególnych pomieszczeń |
A = |
12,7 |
m2 |
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Nazwa pomieszczenia |
PRZEGRODA |
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U(K) |
dt |
U*dt |
Q1 |
Dodatki |
Zapotrzebowanie na ciepło |
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Nazwa |
Długość |
Wysokość |
Powierzchnia |
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ti - te |
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d1 i d2 |
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UK = |
0,37 |
W/m2*K |
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[W/m2*K+(m/m2) => [W/m2*K] |
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m |
m |
m2 |
W/m2*K |
C |
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Pokój |
St |
5,00 |
4,01 |
20,07 |
0,24 |
12 |
2,90 |
58,27 |
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SZ1 |
5,00 |
3,00 |
12,75 |
0,39 |
40 |
15,60 |
198,90 |
-0,10 |
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SZ2 |
4,00 |
3,00 |
12,00 |
0,35 |
40 |
14,00 |
168,00 |
-0,05 |
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20 oC |
O |
1,50 |
1,50 |
2,25 |
2,00 |
40 |
80,00 |
180,00 |
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podłoga str. I |
9,00 |
1,00 |
9,00 |
1,59 |
40 |
63,60 |
572,40 |
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podłoga str. II |
4,00 |
3,01 |
12,05 |
1,59 |
12 |
19,08 |
229,95 |
0,05 |
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Kubatura |
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53,62 |
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1407,52 |
-0,03 |
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Qp |
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1367,52 |
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Qw |
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0,00 |
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Qc |
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1367,52 |
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Zadanie 2 |
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Dla pomieszczenia z zadania poprzedniego dokonać strat ciepła przy założeniu, że na |
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poddaszu domu : |
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a) należy utrzymać temperaturę 5 °C |
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b) 17 ludzi zaczyna wykonywać lekką pracę fizyczną w temperaturze 20°C przy włączonych |
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trzech lapmach fluorescencyjnych o 200 W każda |
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Straty ciepła wynoszą 50% zysków ciepła. |
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1) zyski ciepła jawnego od ludzi |
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QL = N*qi |
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gdzie: |
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qi - zależy od rodzju wykonywanej pracy dla 20°C na poddaszu = |
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120,9 |
W |
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N = |
17 |
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QL = |
2055,3 |
W = |
2,0553 |
kW |
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2) zyski ciepła od oświetlenia |
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Qoś = PS*β*φ |
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PS = |
200 |
W |
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φ = |
1 |
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β = |
0,3 |
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Qoś = |
180 |
W |
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Q = QL+Qoś |
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Q = |
2235,3 |
W |
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QZ = |
1117,7 |
W |
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Obliczamy do jakiej temperatury grzeje się powietrze na poddaszu. |
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W= J/s |
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QZ*t = m*CV*ΔT |
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t = 2h = |
7200 |
s |
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ΔT = |
57,42 |
°C |
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V = |
160 |
m3 |
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CV = |
718 |
J/kg*°C |
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ς = |
1,22 |
kg/m3 |
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TK = ΔT+TP |
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TK = |
77,42 |
°C |
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TP = |
20 |
°C |
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2) nad rozpatrywanym pomieszczeniem znajduje się pokój z oknem dachowym o |
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powierzchni 1,5 m2 |
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Natężenie promieniowania bezpośredniego = |
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717 |
W/m2 , |
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Natężenie promieniowania rozproszonego = |
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43 |
W/m2 , |
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Zapotrzebowanie na ciepło dla poszczególnych pomieszczeń |
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Nazwa pomieszczenia |
PRZEGRODA |
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U(K) |
dt |
U*dt |
Q1 |
Dodatki |
Zapotrzebowanie na ciepło |
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Nazwa |
Długość |
Wysokość |
Powierzchnia |
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ti - te |
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d1 i d2 |
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m |
m |
m2 |
W/m2*K |
C |
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|
|
|
|
|
|
Pokój |
St |
5,00 |
4,01 |
20,07 |
0,24 |
15 |
3,63 |
72,84 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
SZ1 |
5,00 |
3,00 |
12,75 |
0,39 |
40 |
15,60 |
198,90 |
-0,10 |
|
|
|
|
|
|
|
|
|
|
|
|
|
SZ2 |
4,00 |
3,00 |
12,00 |
0,35 |
40 |
14,00 |
168,00 |
-0,05 |
|
|
|
|
|
|
|
|
|
|
|
|
20 oC |
O |
1,50 |
1,50 |
2,25 |
2,00 |
40 |
80,00 |
180,00 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
podłoga str. I |
9,00 |
1,00 |
9,00 |
1,59 |
40 |
63,60 |
572,40 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
podłoga str. II |
4,00 |
3,01 |
12,05 |
1,59 |
12 |
19,08 |
229,95 |
0,05 |
|
|
|
|
|
|
|
|
|
|
|
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|
Kubatura |
|
53,62 |
|
|
|
|
1422,09 |
-0,03 |
|
|
|
|
|
|
|
|
|
|
|
|
Qp |
|
|
|
|
|
|
|
|
|
1382,09 |
|
|
|
|
|
|
|
|
|
|
|
Qw |
|
|
|
|
|
|
|
|
|
0,00 |
|
|
|
|
|
|
|
|
|
|
|
Qc |
|
|
|
|
|
|
|
|
|
1382,09 |
|
|
|
|
|
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|
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|