Abstract: A plate-type heat exchanger includes heat-exchange plates which are mutually stacked and facing each other so as to define, in the space between them, at least two passage channels. The heat-exchange plates have respective entry apertures which are substantially mutually adjacent so as to define an entry conduit. The entry conduit is connected with the passage channel of the corresponding fluid through at least one orifice. The entry apertures have respective collar-like edgings. Each one of the collar-like edgings has an abutment flange which extends radially with respect to the axis of the entry apertures and is adapted to engage, by contact, the abutment flange of the collar-like edging of an adjacent heat-exchange plate.

Abstract: An evaporator includes an enclosure with a lateral confinement shell with a substantially horizontal axis, which internally accommodates a dispenser of a coolant fluid and at least one tube bundle, which is arranged below the dispenser. The evaporator further includes exchanger tubes, which are passed through by a fluid to be cooled. At least one first group of exchanger tubes is arranged along rows which extend on substantially horizontal and mutually superimposed planes. The exchanger tubes of each row are arranged in at least one respective tray for collecting and distributing the liquid coolant fluid. Each tray has, along at least one first longitudinal edge, at least one first containment sidewall which is adapted to allow the liquid coolant fluid contained therein to fall by overflowing into an underlying tray and is provided in its bottom with openings for draining the liquid coolant fluid.