Abstract: A flame tube having a tubular body with an inner side surface, extending around an axis (A), an inlet section and an outlet section, a plurality of fins leaning out, substantially in the radial direction (R), from the inner side surface towards the axis (A) is provided. The fins have an extended surface whose tangent (T), in a point (C) normal to the radial direction (R), is skew with respect to the axis (A), a first and a second fin forming an interspace between the respective extended surfaces facing one another and whose ideal extension (P) in the direction of the tangent (T) encounters a third fin.

Abstract: A flame tube having a tubular body with an inner side surface, extending around an axis (A), an inlet section and an outlet section, a plurality of fins leaning out, substantially in the radial direction (R), from the inner side surface towards the axis (A) is provided. The fins have an extended surface whose tangent (T), in a point (C) normal to the radial direction (R), is skew with respect to the axis (A), a first and a second fin forming an interspace between the respective extended surfaces facing one another and whose ideal extension (P) in the direction of the tangent (T) encounters a third fin.

Abstract: A cooling or heating device in an absorption heat pump of GAX type, including a generator, a GAX heat exchanger, an absorber, a condenser, an evaporator, a pump connected to the absorber and generator, and a first circuit for refrigerant solution circulating through the device and connecting together at least the generator, GAX heat exchanger, absorber, condenser, evaporator, and pump. A valve device modifies the first circuit to vary the manner in which the absorber, condenser, and evaporator are connected together. At least first and second heat exchanger units enable at least one phase of the circulating solution to be changed and to enable thermal energy to be exchanged against an external fluid, the first and second heat exchanger units each including at least two mutually separate sub-heat exchangers configured to function either as an evaporator or as an absorber and condenser, depending on an operating mode of the device.

Abstract: A cooling or heating device in an absorption heat pump of GAX type, including a generator, a GAX heat exchanger, an absorber, a condenser, an evaporator, a pump connected to the absorber and generator, and a first circuit for refrigerant solution circulating through the device and connecting together at least the generator, GAX heat exchanger, absorber, condenser, evaporator, and pump. A valve device modifies the first circuit to vary the manner in which the absorber, condenser, and evaporator are connected together. At least first and second heat exchanger units enable at least one phase of the circulating solution to be changed and to enable thermal energy to be exchanged against an external fluid, the first and second heat exchanger units each including at least two mutually separate sub-heat exchangers configured to function either as an evaporator or as an absorber and condenser, depending on an operating mode of the device.