Once the caloric fluid has been heated, it is transferred either to a storage unit or directly into the client’s process through a thoroughly insulated piping network.
Rackam generally uses a special thermal oil to absorb and transfer heat from the solar field to the client process. Some of our oils have low viscosity at low temperatures, making them particularly suited to Nordic climates. Another advantage is durability and stability. As there is no oxygen in our pumping system, the oil has a guaranteed 35-year useful life span. In addition, our oils are certified food-grade and thus not considered hazardous.
Measurement and monitoring
All processes are carefully monitored in real-time, without requiring any on-site presence. Our systems come with various measurement devices for tracking performance over longer periods of time.
The meteorological station closely monitors weather conditions. When unfavorable weather occurs (clouds, rain, snow, or strong winds), the station automatically signals to the system to “flip over” the mirrors into a protective inverted-U position.
The pumping module allows the caloric fluid to circulate in the system. The pumping module effectively matches radiation with flow rate in order to heat the fluid to its desired temperature.
The solar field is composed of S10 or S20 parabolic troughs. These mirrors concentrate the sun’s rays on an evacuated absorber tube in which a caloric fluid circulates. The fluid can be heated to temperatures ranging from 100C to 300C, depending on the client’s heating requirements. The evacuated tubes guarantee minimal heat losses even at very cold outside temperatures.
The tracking device allows the parabolic troughs to track the sun’s rays by slowly rotating the mirrors on a single axis throughout the day, thereby ensuring an optimal concentration of solar radiation.