A compact air-to-water heat exchanger in the bottom of the HyWin box and the vertical air flow adjusts the temperature inside the cavity according to actual sun radiation, internal heat sources and outside temperature.
The cavity box consists of a triple insulating glazing on the outside and a simple safety glazing on the room side. A third glass panel inside the cavity separates the upstream from downstream air flow.
The closed cavity kept around room temperature isolates the room from the climate and allows for slow, dustfree air exchange between the room and the box. At the same time, there is a controlled heat transfer between the room and the closed cavity. The energy gathered from the HyWin facade is stored in earth probes and used to heat the cavity in cold periods.
The fan moves the air through the heat exchanger, where it cools down. The cooled air flows upwards on the room side of the HyWin cavity.
Same principle as the summer operation, except that the heat exchanger heats the air. The heat flow in winter is considerably lower.