COSP (Coefficient of system performance)
The COSP of a heat pump is based on the total heat extracted (also referred to as Q) in relation to the energy supplied to the heat pump (also referred to as W).
Cross flow heat exchanger
A cross-flow heat exchanger exchanges thermal energy from one airstream to another in an air handling unit (AHU). Unlike a rotary heat exchanger, a cross-flow heat exchanger does not exchange humidity and there is no risk of short-circuiting the airstreams.