Technical data

www.dimplex.de 01.2012 | Project planning manual for heat pumps for heating and domestic hot water preparation | 11
Selection and design of heat pumps 1.1.2
Table 1.2: Heat output of radiator elements (at a room temperature of t
i
=20 °C, according to DIN 4703)
b) Experimental determination of the heating period
(see Fig. 1.1 on page 11)
The flow and return temperatures are continually reduced
during the heating period with the thermostat valves fully
open until a room temperature of approx. 20–22 °C is
reached. Once the desired room temperature has been
reached, the current flow and return temperatures plus the
outside temperature are noted and entered in the diagram
shown below. The actually required temperature level (low,
medium, or high temperature) can be read from the entered
value using this diagram.
NOTE
Carrying out a hydraulic alignment can reduce the maximum required
flow temperature!
Fig. 1.1: Diagram for experimental determination of the actually required system temperatures
Cast iron radiators
Height mm 980 580 430 280
Depth mm 70 160 220 110 160 220 160 220 250
Heat output per element in W,
at mean water temperature T
m
50 °C 45 83 106 37 51 66 38 50 37
60 °C 67 120 153 54 74 97 55 71 55
70 °C 90 162 206 74 99 129 75 96 74
80 °C 111 204 260 92 126 162 93 122 92
Steel radiators
Height mm 1,000 600 450 300
Depth mm 110 160 220 110 160 220 160 220 250
Heat output per element in W, at mean
water temperature T
m
50 °C 50 64 84 30 41 52 30 41 32
60 °C 71 95 120 42 58 75 44 58 45
70 °C 96 127 162 56 77 102 59 77 61
80 °C 122 157 204 73 99 128 74 99 77
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