|
cappuccino
generatore a gas
fuoco
heat extractor. Primavera 2005
Gas
version
faq
camino
camino 2
gas
GAS ITALIANO-ORIZZ1.pdf
Power point presentation
relazione
generatore aria da camino-2.pdf
camino
camino 2
 
 
Q=a*Tm-Ta)
a=coefficiente
di convezione
a prop Nu prop
Re**0.8 prop v**0.8
Nu=numero di
nusselt
Re=numero di
Reynolds
v =velocita’
dell’aria
|
V=
[m/sec]
|
A=
watt/^C
|
|
0.2
|
6
|
|
2
|
38
|
|
20
|
250
|
Le tabelle seguenti mostrano che:
-Il rapporto Econvezione/Eirraggiamento e
monotono crescente con il coefficiente di convezione
ma verso la temperatura ha un massimo
verso campi di temperatura fra i 100 C ed i 250 C. ;
-Per beta=6 convezione naturale il
rapporto Econv/Eirr e` disastroso : 0.4-0.1 !!!!!!!!!!!!!!
|
Temp |
Eirr |
|
Ec 6 |
Ec 50 |
Ec 100 |
Ec 150 |
Ec 200 |
Ec 250 |
Ec 300 |
|
|
|
|
|
|
|
|
|
|
|
|
0 |
315 |
|
-120 |
-1,000 |
-2,000 |
-3,000 |
-4,000 |
-5,000 |
-6,000 |
|
50 |
617 |
|
180 |
1,500 |
3,000 |
4,500 |
6,000 |
7,500 |
9,000 |
|
100 |
1,098 |
|
480 |
4,000 |
8,000 |
12,000 |
16,000 |
20,000 |
24,000 |
|
150 |
1,815 |
|
780 |
6,500 |
13,000 |
19,500 |
26,000 |
32,500 |
39,000 |
|
200 |
2,838 |
|
1,080 |
9,000 |
18,000 |
27,000 |
36,000 |
45,000 |
54,000 |
|
250 |
4,242 |
|
1,380 |
11,500 |
23,000 |
34,500 |
46,000 |
57,500 |
69,000 |
|
300 |
6,112 |
|
1,680 |
14,000 |
28,000 |
42,000 |
56,000 |
70,000 |
84,000 |
|
350 |
8,542 |
|
1,980 |
16,500 |
33,000 |
49,500 |
66,000 |
82,500 |
99,000 |
|
400 |
11,632 |
|
2,280 |
19,000 |
38,000 |
57,000 |
76,000 |
95,000 |
114,000 |
|
450 |
15,493 |
|
2,580 |
21,500 |
43,000 |
64,500 |
86,000 |
107,500 |
129,000 |
|
500 |
20,244 |
|
2,880 |
24,000 |
48,000 |
72,000 |
96,000 |
120,000 |
144,000 |
|
|
|
|
|
|
|
|
|
|
|
|
Temp |
Eirr |
|
C/I 6 |
C/I 50 |
C/I 100 |
C/I 150 |
C/I 200 |
C/I 250 |
C/I 300 |
|
0 |
315 |
|
-0.4 |
-3.2 |
-6.3 |
-9.5 |
-12.7 |
-15.9 |
-19.0 |
|
50 |
617 |
|
0.3 |
2.4 |
4.9 |
7.3 |
9.7 |
12.2 |
14.6 |
|
100 |
1,098 |
|
0.4 |
3.6 |
7.3 |
10.9 |
14.6 |
18.2 |
21.9 |
|
150 |
1,815 |
|
0.4 |
3.6 |
7.2 |
10.7 |
14.3 |
17.9 |
21.5 |
|
200 |
2,838 |
|
0.4 |
3.2 |
6.3 |
9.5 |
12.7 |
15.9 |
19.0 |
|
250 |
4,242 |
|
0.3 |
2.7 |
5.4 |
8.1 |
10.8 |
13.6 |
16.3 |
|
300 |
6,112 |
|
0.3 |
2.3 |
4.6 |
6.9 |
9.2 |
11.5 |
13.7 |
|
350 |
8,542 |
|
0.2 |
1.9 |
3.9 |
5.8 |
7.7 |
9.7 |
11.6 |
|
400 |
11,632 |
|
0.2 |
1.6 |
3.3 |
4.9 |
6.5 |
8.2 |
9.8 |
|
450 |
15,493 |
|
0.2 |
1.4 |
2.8 |
4.2 |
5.6 |
6.9 |
8.3 |
|
500 |
20,244 |
|
0.1 |
1.2 |
2.4 |
3.6 |
4.7 |
5.9 |
7.1 |
|
