ABSTRACT
The run-around membrane energy exchanger (RAMEE) is a novel passive energy recovery system currently under development and research. It applies a closed-loop liquid desiccant to transfer heat and moisture between two adjacent or nonadjacent air streams with temperature and water vapor concentration differences. This entry discusses the construction and operation of RAMEEs, as well as their effectiveness in transferring heat and moisture between air streams. They have high effectiveness values and low pressure drops, as well as negligible contaminant transfer between air streams. These features make RAMEEs both economical and environmentally friendly for use in building heating, ventilation, and air-conditioning (HVAC) systems, especially for retrofit applications and health-care facilities.