Passive solar water heaters don't have pumps to move hot and cold water around. They come in two distinct variations: integral collector-storage systems and thermosiphon systems. Passive solar ...

There are two main types of solar water heaters: active systems, which use pumps to circulate water through the collectors and into the storage tank; and passive systems, which rely on natural ...

Researchers at Thailand’s Vidyasirimedhi Institute of Science and Technology demonstrated a novel hydrogel that has high ...