General Studies · Heat Transfer

The heat exchanger in which a fluid remains at a constant temperature while changing its phase, while the temperature of the other fluid changes from inlet to outlet is characteristic of certain devices. Specifically, a heat exchanger where the cold fluid evaporates and remains at a constant temperature while the hot fluid temperature decreases is an evaporator. Conversely, what is it called when the hot fluid remains at a constant temperature while releasing latent heat to a cold fluid whose temperature increases?