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SOL
AR HEA
TING SY
STEM
HEATING SYSTEM DESIGN
Table 4.2 Expansion vessel requirements
Safety valve setting
3.0
Vessel charge pressure
(bar)
0.5 1.0
1.5
Initial system charge
pressure (bar)
0.5 1.0 1.5 2.0 1.0 1.5 2.0 1.5 2.0
Total system volume (l)
Expansion vessel volume (l)
25
2.1 3.5 6.5 13.7 2.7 4.7 10.3 3.9 8.3
50
4.2 7.0 12.9 27.5 5.4 9.5 20.6 7.8 16.5
75
6.3 10.5 19.4 41.3 8.2 14.2 30.9 11.7 24.8
100
8.4 14.0 25.9 55.1 10.9 19.0 41.2 15.6 33.1
125
10.4 17,5 32.4 68.3 13.6 23.7 51.5 19.5 41.3
150
12.5 21.0 38.8 82.6 16.3 28.5 61.8 23.4 49.6
4.5
SOLAR HEATING SYSTEM
4.5.1 General
(a)
All components in the solar primary system must be marked or identified in such a way
that their design pressure and temperature can be readily determined.
(b)
A safety device (pressure relief valve) to control the risk of over-pressure in the solar
heating system components should be fitted.
(c)
A termination from the safety pressure device should minimise the risk of injury to persons
or damage to materials. Suitable locations are a high temperature receptacle, an internal
gully or else discharge externally at ground level. High level termination from walls or on
roofs could cause injury to people or animals below if the valve were to release scalding
water or steam.
(d)
The pipes leading from the safety device to the collector should be rigid and non-
deformable contraction without any possibility of restriction or disclosure by any other
fitted component.
(e)
The Building Regulations 2000 specify the requirements for the storage vessels for use in
solar heating systems. Therefore it is important to ensure that the Torrent model selected
meets these requirements with regard to dedicated solar volume and the solar heat
exchanger surface area.
4.5.2 Torrent
Direct-Solar
(a)
A typical Torrent Direct-Electric solar heating system based on a generic solar controller is
shown in figure 4.7.
Therefore general design requirements for hot and cold water systems (section 3), for Ball
valve and overflow (section 4.1), for water treatment (section 4.2) and for heating system
design (section 4.3) should be taken into account when designing the Torrent RE-solar
based systems.
Summary of Contents for TORRENT COMBI-PREHEAT
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