Abstract: The invention is directed to a process to manufacture an interconnected stack of thermoplastic frames having two sides by stacking the thermoplastic frames to obtain a stack of frames such that the facing sides of two neighbouring frames are in contact with each other at a contact area. When stacking a longitudinal conduit is formed which runs along the length of the stack and a branched conduit is formed at the contact area. The interconnected stack of thermoplastic frames are obtained by supplying a pressurised melt of a plastic material to the elongated conduit and branched conduits.

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).

Abstract: The invention is directed to a modular gas flow system comprising at least a first and a second hollow cuboid shaped gas flow element. The four edges of at least one open face of the first gas flow element is connected in a gas tight manner to four edges of an open face of the second hollow cuboid shaped gas flow element. A valve or a partition is present at the connecting open faces. The gas flow system may be a header of a plate heat exchanger.