Solar Water Heaters
The total system with solar collector, storage tank and pipelines is called solar hot water system. The choice of system depends on factors such as temperature, weather conditions, space availability and the average annual solar radiation.
The solar water heating systems are of two categories
Closed loop system: This system is preferred at regions where the pH level of the water is above 7.2 (Classified as hard water). This system consists of heat exchangers in order to protect the system from hard water extracted from bore wells or in case of cold regions with freeze temperatures.
Open loop system: These systems are suitable for domestic and small institutional systems where the pH level of water is relatively lower generally termed as soft water. The forced circulation systems utilize electrical pumps to circulate the water through collectors and storage tanks.