Air-air heat exchanger

Abstract

Air-air heat exchanger ( 1 ) intended to be fitted to a room double-flow ventilation system comprising a plurality of plates ( 2 ) that are superposed to form a stack ( 3 ), each plate ( 2 ) comprising a plurality of flow channels forming a first air circulation volume ( 5 ) for a first air flow. The heat exchanger ( 1 ) further comprises spacer means designed to keep the plates ( 2 ) a distance apart so as to delimit a space ( 10 ) between two adjacent plates ( 2 ), these various spaces ( 10 ) between plates ( 2 ) forming an air circulation volume for a second air flow, first means for closing off the spaces ( 10 ) between the plates ( 2 ) at the two ends ( 6, 7 ) of the exchanger, second closing-off means ( 13 ), these second closing-off means ( 13 ) comprising, near the ends of the exchanger, two openings ( 20, 21 ), one for letting the second air flow in and the other for letting it out.

1 . An air-air heat exchanger to be fitted to a room double-low ventilation system, comprising:
 a plurality of identical and parallelepiped plates that are superimposed to form a generally parallelepiped stack, each plate comprising a plurality of air flow channels extending over the entire length of the plate, said channels being delimited by longitudinal partitions, all of the air circulation channels of the plates forming a first air circulation volume for guiding a first air flow in a first direction, over the entire length of the exchanger between a first end and a second end of the exchanger,   characterized in that it comprises:   spacer means designed to keep the plates a distance apart so as to delimit a space between two adjacent plates, these various spaces between plates forming an air circulation volume for guiding a second air flow in a second direction substantially parallel to the first direction,   first means for closing off the spaces between the plates at the two ends of the exchanger,   second means for closing off the spaces between the plates at the two longitudinal walls of the exchanger, parallel to the circulation channels for the first air flow,   Wherein the second closing-off means comprises, in one and/or the other of the two longitudinal walls, and near the two ends of the exchanger, two openings, one for letting the secondary flow in and the other for letting it out, respectively, arranged to guide the first and second air flows in opposite directions.   
     
     
         2 . The air-air heat exchanger according to  claim 1 , wherein the spacer means and the first closing-off means are made using at least two nozzle pieces respectively positioned at the first end and the second end of the exchanger. 
     
     
         3 . The air-air heat exchanger according to  claim 2 , wherein each nozzle piece comprises:
 at least one housing to house one side of a plate on which the channels emerge, this housing being provided with a through opening emerging in the circulation channels formed by the channels of the plate housed therein,   at least one spacer forming the spacer means, the or each spacer maintaining a distance, alone or in cooperation with another spacer arranged on another end nozzle, from a plate housed in the nozzle piece of a directly adjacent plate in the stack,   at least one closing-off member, for example such as a closing-off plate, forming the first closing-off means, said or each member closing off, alone or in cooperation with a closing-off member arranged on another nozzle piece, the space between a plate housed in the nozzle piece and a directly adjacent plate in the stack.   
     
     
         4 . The air-air heat exchanger according to  claim 3 , wherein each spacer serves as a closing-off member. 
     
     
         5 . The air-air heat exchanger according to  claim 3 , wherein the nozzle piece or set of nozzle pieces equipping the first/second end of the exchanger closes the edge of the set of spaces between plates at the first/second end of the exchanger so as to separate the first and second circulation volumes at the first/second end of the exchanger. 
     
     
         6 . The air-air heat exchanger according to  claim 1 , wherein the second closing-off means comprise longitudinal ribs arranged between two directly adjacent plates in the stack, said ribs closing at least one longitudinal wall of the exchanger during formation of the stack. 
     
     
         7 . The air-air heat exchanger according to  claim 1 , wherein the second closing-off means comprise at least one closing-off plate fastened at the longitudinal wall of the exchanger so as to hermetically seal each inter-plate space on that same longitudinal wall, said closing-off plate preferably comprising second spacer means between plates such as spacers. 
     
     
         8 . The air-air heat exchanger according to  claim 1 , wherein the inlet and the outlet of the second air flow are arranged on the same lateral wall of the exchanger. 
     
     
         9 . The air-air heat exchanger according to  claim 1 , wherein the inlet and outlet of the second air flow are respectively positioned on one and the other of the lateral walls. 
     
     
         10 . The air-air heat exchanger according to  claim 2 , further comprising a double collector for two flows of air arranged at each end of the stack, each collector making it possible to separate and orient the air flows either from the air-air network toward the corresponding circulation volume, or from the corresponding circulation volume toward the air-air network, the separation of the flow being obtained using the nozzle piece(s) arranged on the end of the stack on which the collector is installed, a portion elongated to extend the end of the stack serving as the partition to separate the air flows. 
     
     
         11 . The air-air heat exchanger according to  claim 1 , further comprising an air bypass corridor delimited by a chute adjacent to the stack, an air flow collector, and a valve mounted in the collector, movable between two positions, comprising a first position in which it orients one of the air flows, toward the first or the second circulation volume, and a second position in which it orients that same air flow toward the air bypass corridor. 
     
     
         12 . The air-air heat exchanger according to  claim 1 , wherein the plates, the spacer means, and the first closing-off means are made from a plastic. 
     
     
         13 . A controlled room double-flow ventilation system, comprising an air-air heat exchanger according to  claim 1 . 
     
     
         14 . The controlled room double-flow ventilation system according to  claim 13 , wherein the heat exchanger is arranged such that the first flow of air circulating in the first air circulation volume of the exchanger is blown into the room, and the second air flow circulating in the second air circulation volume of the exchanger is removed from the room.