Mikrofill ETHOS 90 - Conversion Formulae & Factors; Non-Condensing Boiler Formulae; Condensing Boiler Formulae

CONVERSION FORMULAE & FACTORS
TECHNICAL DOCUMENTATION 43
FOR NON-CONDENSING BOILERS:
FOR CONDENSING BOILERS:
As a result of condensation, the efficiency at the lower value increases.
• no / nb
• ΔT
• nb
• no
• CO
2
• O
2
• A
• 1 Degree English Hardness (°e) = 65 mg CaCO
3
/imp. gallon
• 1 Grain / US Gallon = 0.958 odH
• 1 milligram equivalent per l (mval/l) = 2.8 odH
• 1 ppm (parts per million) CaCO
3
= 1 mg CaCO
3
/l
meq/l
°dH
°f
°e
MgCaCO
3
/l
CO
2
0.339
nb = 90 -
x ΔT+ 0.008
CO
2
0.377
no = 100 -
x ΔT+ 0.009
CO
2
0.339
nb = 90 -
x ΔT + A + 0.008 7.5 + 0.006 ΔT
= 1.11
= Difference in temperature between the flue gases and the environmental temperature (°K).
= Fuel efficiency at the gross calorific value.
= Fuel efficiency at the nett calorific value.
= The volume of CO
2
in the flue gas (%).
= The volume of O
2
in the flue gas (%).
= The quantity of condensed water in the appliance per m
3
gas in kg (kg/m
3
gas).
meq/l
-
0.37
0.2
0.285
0.02
°dH
1
-
0.56
0.8
0.056
°f
2.8
1.78
-
1.43
0.1
°e
5
1.25
0.7
-
1.54
MgCaCO
3
/l
50
17.8
10
14.3
-
▲ FIGURE 14. DERIVATION OF DEGREE.