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12 Appendix
Tab.20
Weighting of boilers
Psup / (Prated + Psup)
(1)(2)
0
0.1
0.2
0.3
0.4
0.5
0.6
≥ 0.7
(1) The intermediate values are calculated by linear interpolation between the two adjacent values.
(2) Prated is related to the preferential space heater or combination heater.
Tab.21
Package efficiency
De Dietrich - IX
Seasonal space heating energy efficiency of boiler
Temperature control
Seasonal space heating energy efficiency of package
34
IX
I
The value of the seasonal space heating energy efficiency of the
preferential space heater, expressed in %.
II
The factor for weighting the heat output of preferential and
supplementary heaters of a package as set out in the following
table.
III
The value of the mathematical expression: 294/(11 · Prated),
whereby 'Prated' is related to the preferential space heater.
IV
The value of the mathematical expression 115/(11 · Prated),
whereby 'Prated' is related to the preferential space heater.
II, package without hot water storage tank
0
0.3
0.55
0.75
0.85
0.95
0.98
1.00
II, package with hot water storage tank
0
0.37
0.70
0.85
0.94
0.98
1.00
1.00
IX 145–50
%
93
%
2
%
95
7702704 - v02 - 20122018
IX 145–70
93
2
95
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