An evaporator plate heat exchanger

Abstract

The invention is directed to an evaporator plate heat exchanger comprising a water supply (1) and a water discharge (2) and a stack (4) of injected moulded frames (5) and heat exchange sheets (6), wherein the stack has two ends (7, 8) and at least four sides (9, 10, 11,12). The stack (4) has alternating first (13) and second (14) spaces between the heat exchange sheets (6). The stack (4) comprises a first enclosed space (15) at one side of the stack (4) which is fluidly connected to the first spaces (13) and not fluidly connected to the second spaces (14). The first enclosed space (15) is fluidly connected to the water supply (1).

1 . An evaporator plate heat exchanger comprising a water supply and a stack of injected moulded frames and heat exchange sheets,
 wherein the stack has two ends and at least four sides,   wherein the stack has alternating first and second spaces between the heat exchange sheets,   the stack further comprises a first enclosed space at one side of the stack which is fluidly connected to the first spaces and not fluidly connected to the second spaces and   wherein the first enclosed space is fluidly connected to the water supply.   
     
     
         2 . An evaporator plate heat exchanger according to  claim 1 , wherein the stack further comprises a second enclosed space at the opposite side of the stack which is fluidly connected to the first spaces and not fluidly connected to the second spaces and wherein the second enclosed space is fluidly connected to a water discharge. 
     
     
         3 . An evaporator plate heat exchanger according to  claim 1 , wherein the frame and the heat exchange sheet are comprised in a heat exchange plate and wherein the heat exchange plate is an insert moulded work product wherein the heat exchange sheet is the insert of the insert moulded work product. 
     
     
         4 . An evaporator plate heat exchanger according to  claim 3 , wherein the stack comprises alternatingly stacked first heat exchange plate and differently shaped second heat exchange plate. 
     
     
         5 . An evaporator plate heat exchanger according to  claim 1 , wherein the first enclosed space is formed by openings in the injected moulded frames and wherein the resulting two open ends are closed by a wall as present in closed end frames. 
     
     
         6 . An evaporator plate heat exchanger according to  claim 1 , wherein the first enclosed space is formed by a box shaped part having an open side and wherein the box shaped part is fixed to the first side of the stack such that the open side faces the first side of the stack. 
     
     
         7 . An evaporator plate heat exchanger according to  claim 1 , wherein the first enclosed space is fluidly connected to the first spaces by means of elongated and parallel openings or parallel rows of smaller openings. 
     
     
         8 . An evaporator plate heat exchanger according to  claim 1 , wherein the heat exchange sheet is an aluminium sheet. 
     
     
         9 . An evaporator plate heat exchanger according to  claim 1 , wherein two consecutive heat exchange sheets in the stack have facing sides to first space and wherein the facing sides are provided with a layer of a hydrophilic material. 
     
     
         10 . An evaporator plate heat exchanger according to  claim 1 , wherein the frame of the heat exchange plate is made of acrylonitrile butadiene styrene (ABS), Nylons (polyamides; PA), polypropylene (PP), polyethylene (PE) or polyvinyl chloride (PVC). 
     
     
         11 . An evaporator plate heat exchanger according to  claim 1 , wherein the frame has a square shape or a rectangular shape. 
     
     
         12 . An evaporator plate heat exchanger according to  claim 1 , comprising multiple stacks of interconnected injected moulded frames, each stack provided with closed end frames. 
     
     
         13 . An evaporator plate heat exchanger according to  claim 12 , wherein the stacks have the same number of interconnected injected moulded frames. 
     
     
         14 . An evaporator plate heat exchanger according to  claim 1 , wherein the number of interconnected frames is between 15 and 50. 
     
     
         15 . An evaporator plate heat exchanger according to  claim 14 , wherein the frame has a square shape or a rectangular shape resulting in a box shaped stack and wherein the stacks are positioned in line such that their respective sides are in line and wherein a second side of the stack is connected to an header for a first gas flow and connected to a header for a second gas flow and wherein a fourth side of the stack is connected to a header for the second gas flow and to a header for the first gas flow. 
     
     
         16 . An evaporator plate heat exchanger according to  claim 15 , wherein the headers are comprised of interconnected modular elements of the same size and shape. 
     
     
         17 . An evaporator plate heat exchanger according to  claim 16 , wherein the modular element is a hollow cuboid shaped gas flow element, each gas flow element having an interior space six open faces, eight vertices and twelve edges interconnecting the eight vertices,
 wherein the four edges of at least one open face of a first gas flow element of one header is connected in a gas tight manner to four edges of an open face of a second hollow cuboid shaped gas flow element of the same header at their respective connecting open faces and,   wherein at their respective connecting open faces the four edges of the open face of the first gas flow element is connected in a gas tight manner to four edges of the open face of the second hollow cuboid shaped gas flow element by means of a connecting frame,   wherein the connecting frame is provided with means to connect to the four edges of the open face of the first gas flow element and is provided with connecting means to connect to the four edges of the open face of the second hollow cuboid shaped gas flow element.   
     
     
         18 . An evaporator plate heat exchanger according to  claim 17 , wherein at one side of the stack or stacks the hollow cuboid shaped gas flow elements of one header are connected to the hollow cuboid shaped gas flow elements of the other header. 
     
     
         19 . An evaporator plate heat exchanger according to  claim 18 , wherein the hollow cuboid shaped gas flow elements of one header are connected to the hollow cuboid shaped gas flow elements of the other header and wherein in the connection between the two headers valves are present allowing to fluidly connect and disconnect the connected headers. 
     
     
         20 . Use of an evaporator plate heat exchanger according to  claim 1 , wherein the first enclosed space contains pressurised water.