Abstract: The invention concerns a heat recycling system comprising at least one exhaust air heat exchanger mounted inside the exhaust air flow of a ventilating and/or air-conditioning plant, especially of a building or a portion of a building, and at least one outside air heat exchanger mounted within the intake air flow of such unit, whereby the heat exchangers are integrated within the circuit, whereby for the production of cold, especially nighttime cold from outside air at least one partial circuit can be segregated from the integrated circuit, in which circuit is mounted one of the heat exchangers, especially an exhaust air heat exchanger, through which the outside air can be channeled in order to cool the fluid in said partial circuit, whereby the partial circuit features at least one heat exchanger, through which the cold so recovered can be channeled into a cooling circuit.

Abstract: A heat exchanger is formed by selectively stacking an appropriate number of functionally independent and discrete heat exchange panels, each of which is a complete heat exchanger in its own right with a set of vanes and two flow passages in indirect heat exchange relationship through said vanes.