Anslut 417-031 Instalation Instructions Download

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ENGLISH

PRESSURE DROP

DIMENSIONING THE SOLAR HEATING SYSTEM

General

When dimensioning a solar heating system there are a large number of important parameters, such as
the heating requirement for the house and the tap water, the arrangement of supplementary/existing
sources of heat, the existing distribution system and its supply temperature, the volume of water in the
tank, the number of people living in the property, the geographical location, and the positioning of the
solar collectors etc. The efficiency of the solar collector is of course also of prime importance and Anslut
recommends a reasonable dimensioning of a highly efficient solar heating system instead of an
overdimensioning. By this we mean that we dimension the solar heating to ensure maximum cost-
efficiency during the periods of the year when there is good solar radiation and when necessary
supplement with alternative energy-efficient sources of heat, which are energy-efficient during the periods
when the solar radiation is low and during all situations that must be supported with supplementary heat.
The following generally accepted rules of thumb can form the starting point for the dimensioning of the
system.

Dimensioning of the tap water system



Suitable area of solar collector approx. 1.5 m² per person.



One 20-tube solar collector from Anslut is 3.3 m².



For a family of 2 persons the rule of thumb says that 1 Anslut 20-tube solar panel is sufficient, and
for a family of 4 persons 2 collectors are required.



A suitable tank volume would for example be the Anslut "418025" Multi-functional tank of 300 litres
for homes with up to 4 persons. The tank is fitted with a suitable coil length of 10 metres.

Dimensioning for combined use of tap water and heating



Suitable area of solar collector approx. 2.5 m² per person.



One 20-tube solar collector from Anslut is 3.3 m².



For a family of 3-4 persons the rule of thumb says 3-4 Anslut 20-tube solar collectors are sufficient.
We would, however, advise against overdimensioning the solar heating with regard to the heating
requirement for the house (see general information above).



A suitable tank volume is an accumulator tank of 500 litres for homes with up to 4 persons. The
tank should be fitted with a suitable length of solar coil of about 15 metres.

Directional alignment and inclination of solar collector

To avoid an overdimensioned solar collector area an alignment facing south (south-west to south-east) is
the optimal positioning that maximises solar radiation. Anslut vacuum tube solar collectors with heat pipes
absorb via their cylinder design sunlight at basically all angles, but as a guideline it can be said that an
alignment due west or east reduces the effect by just over 20%. For this reason, preferably avoid a due
west or east positioning and strive to avoid shadow over the collector, which considerably reduces the
effect.
A general recommendation is that the solar collector should have an angle of 45°, since this generates
the most total output on average over one year. The angle of an Anslut solar collector should not be less
than 30° (minimum 25°). In general a reduced angle increases the power intake during the summer