Means for recovering heat from a room space, and for ventilation

Claim 1

Means for recovery of heat from air from a room and for ventilation of said room, comprising at least two heat accumulators to which outgoing air from said room delivers its heat and from which incoming air takes heat, a room air outflow duct and a room air inflow duct, each accumulator having one end thereof connected to said outflow and inflow ducts, the direction of flow of air in said ducts being always the same, a flap for controlling the flow of air in said outflow and inflow ducts, a fresh air intake duct and an outgoing exit duct, each accumulator having the opposite end thereof connected to said fresh air intake duct and said outgoing duct, the direction of flow of air in said fresh intake and outgoing exit ducts being always the same, and a second flap for controlling the flow of air in said fresh air intake and outgoing exit ducts, said flaps being synchronized with each other so that the flap associated with the room space outflow duct and inflow duct turns before the second flap, at least that much earlier that the fresh incoming air will circulate a little while through both heat accumulators and escape back to the outdoor atmosphere.