Heat Emitters
Radiator Sizing
Maintenance
Controls
Boilers
Radiators
Regulations
Heat Emitters
Pipework
Formulas
- The mean water temperature = (flow temp. + return temp.)/2
- Temperature difference = Mean temp. - Room temp.
- Overall correction factor = f1 x f2
- Radiator size = total heat loss/overall correction factor
Radiation Correction Factor - F2
Top and bottom opposite-end connections |
1.00 |
Bottom opposite-end connections with blind nipple |
0.97 |
Bottom opposite-end connections |
0.90 |
Temperature Difference Factor - F1
Temp. diff. °C |
f1 |
Temp. diff. °C |
f1 |
40 |
0.605 |
56 |
0.918 |
41 |
0.624 |
57 |
0.938 |
42 |
0.643 |
58 |
0.958 |
43 |
0.662 |
59 |
0.979 |
44 |
0.681 |
60 |
1.000 |
45 |
0.700 |
61 |
1.020 |
46 |
0.719 |
62 |
1.041 |
47 |
0.738 |
63 |
1.062 |
48 |
0.758 |
64 |
1.062 |
49 |
0.758 |
65 |
1.104 |
50 |
0.798 |
66 |
1.125 |
51 |
0.818 |
67 |
1.146 |
52 |
0.838 |
68 |
1.189 |
53 |
0.858 |
69 |
1.189 |
54 |
0.878 |
70 |
1.211 |
55 |
0.898 |
71 |
1.232 |