Water

Unbeatable: Water as the heat transfer fluid in modern large-scale solar thermal systems

In terms of heat capacity, viscosity or price - water is clearly superior in all parameters to any alternative, which is usually filling the system with glycol. Water as the heat transfer fluid clearly makes any solar system more efficient, however, mastering frost protection during winter with low energy consumption is essential. The AquaSystem technology realizes this and has been proven in more than 60,000 Paradigma systems in the range of up to 30 square feet, since 2004. However, the larger the system and the higher the demanded temperatures are, advantage of water becomes apparent. Stagnation safety is not an issue because water turns to steam, whereas glycol breaks down and can potentially harm the system. Our approach on operational safety and durability of a large-scale solar system prohibits the usage of any other heat transfer fluid other than water.