Dimplex ST0133 Landscape Lighting User Manual


 
Technical manual
Page 10 of 72
ST0133 – A 02/09
SOLAR
User
The user varies from installation to installation but has a big influence on the operation
of the solar thermal system. However, the system has all components to ensure the
provision of the comfort levels that the user expects.
3.3.2 Function of a solar thermal system
Bearing in mind the function of the individual components, the function of a solar ther-
mal system is in principle very simple. Based on two measured temperatures, one in
the hottest (T1) and one in the coldest (T2) part of the system, the control unit
switches the pump either on or off depending on the temperature difference between T1
and T2 and the temperature reached in the storage device. The location of the tempera-
ture sensors is indicated in Figure 7.
Figure 7 – Location of temperature sensors in solar thermal system
If T1 is greater than T2 plus an additional temperature differential (called ΔT ‘delta T’),
the circulation pump is being switched on by the control unit to transfer the energy
from the collector into the storage device. As soon as this on condition is not given, the
pump is being switched off.
The solar control unit also ensures that the water in the cylinder is not being heated
above a set temperature which can be freely chosen and is measured by the tempera-
ture sensor T2.
T1
T2