LowUP’s RHeX Rotating Heat Exchanger – Rotating heat recovery unit is one of the Solar Impulse Foundation’s #1000Solutions In 2013, Pozzi patented a newer model of the rotating heat recovery system called RHeX, a key part of the LowUP project. RHeX is a rotating heat exchanger specifically designed to work with dirty effluents containing mechanical particulate without losing efficiency. More on RHeX: Normally,