Booster unit with integrated solar heat exchanger
GP 9000HX is a booster unit with integrated solar heat exchanger, suitable to mid-size solar plants (~ 50 mq). The presence of the heat exchanger allows to couple the solar circuit with a buffer tank featuring no solar coil and to size the tank independently. The heat exchanger is a brazed-plate type and it is extremely efficient in transferring heat from the solar circuit (water-glycol mixture) to the secondary side (heating water). The main peculiarity of GP 9000HX is the presence of a three-way diverter valve, installed downstream the heat exchanger secondary outlet. An electrothermal actuator is mounted on the valve and it is driven by the solar controller. Once the secondary water has been heated, it is normally pumped back to an inlet situated at the buffer tank medium height, which is connected to the diverter valve's straight way. The angle way is connected to an inlet situated in the top instead, and it gets open only if the solar field heats the heating water to a higher temperature than the top tank one, detected by a sensor. This solution is designed to favour the temperature profile stratification, so to make the buffer tank suitable to differentiated uses (e.g.: instantaneous preparation of domestic hot water, high-/low-temperature heating...).