Abstract :
To increase the fractional energy savings achieved with solar thermal combisystems the store volume may be increased. Installation of
large stores in single-family houses is, however, often limited by space constraints. In this article the influence of the store dimensions, as
well as internal and external auxiliary volume configurations, are investigated for large solar water stores by annual dynamic TRNSYS
simulations. The results show that store sizes up to 4 m3 may be used in solar heating systems with 30 m2 collector area. It is further
shown that well-insulated stores are rather insensitive to the geometry. Stores deviating from the conventional dimensions still yield high
fractional energy savings. Furthermore, the simulations show that the performance of an internal auxiliary volume configuration in most
cases exceeds that of a solution with an external auxiliary unit. The practical limitations of very thin auxiliary volumes must, however, be
further investigated.
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