336 m2 Solvarmeanlæg med varmtvandsbeholder med Solvis Indløbsrør: Sundparken, Helsingør

Laboratory tests with stratification inlet pipes marketed by the German company SOLVISSolarsysteme GmbH were carried out in a small test heat storage. The tests showed that the stratification pipes ensure that water entering the heat storage through the pipes enters the heat storage in the 'right' level so that the temperature stratification in the heat storage is built up in the best possible way as long as the volume flow rate of the entering water is lower than 10 l/min.

If the volume flow rate increases the water will enter the heat storage in different levels. For volume flow rates higher that 20 l/min. water enters the heat storage in all levels of the heat storage. It is estimated that the stratification inlet pipes secure a good thermal stratification in the heat storage as long as the volume flow rate is not higher than 15 l/min.

Based on the laboratory tests a 10000 l hot water tank for Sundparken's solar heating system was designed. A 336 m"2 solar domestic hot water system was built in Sundparken, Elsinore. The solar heating system is a low flow system with a 10000 l hot water tank. Half of the solar collectors are facing east, half of the solar collectors are facing west.

The collector tilt is for all collectors 15 deg. from horizontal. Both the east-facing and west-facing collectors have their own solar collector loop, circulation pump, external heat exchanger and control system. The external heat exchangers are used to transfer the heat from the solar collector fluid to the domestic water.

The domestic water is pumped from the bottom of the hot water tank to the heat exchanger and back to the hot water tank through the SOLVIS stratification inlet pipes. In this way the water will enter the tank in the 'right' level so that thermal stratification is built up in the best possible way. In the mornings the east-facing solar collectors produce a lot of heat and therefore high return temperatures of the domestic water.