A PTC liquid heating device comprises a housing extending along a longitudinal axis and defining a liquid inlet and a liquid outlet. A PTC heating unit is inserted into the housing and extends along the longitudinal axis. The PTC heating unit includes a sleeve, a heat conductor and at least one PTC heating core. The heat conductor has a pair of metal profiles defining at least one chamber, the at least one chamber extending along the longitudinal axis to receive the at least one PTC heating core. The heat conductor is located in the sleeve and has a shape matching the sleeve. The PTC liquid heating device provides uniform and efficient heat transfer. In addition, the PTC liquid heating device has improved corrosion resistance and insulation properties, thereby prolonging the service life of the PTC liquid heating device.

The invention relates to a heating device for heating a liquid, in particular a liquid in a tank for storing the liquid, having at least one heating element and at least one thermally conductive body, characterized in that the heating element consists of an electrically conductive plastics material, and in that the electrically conductive plastics material is coupled to the thermally conductive body in an electrically and thermally conductive manner.

A fluid heating ceramic heater can suppress adhesion of scale to a surface of the ceramic heater over an extended time period, and efficiently conduct heat generated from a heat generation resistor to fluid. The ceramic heater has a ceramic body, an outer coating layer and an inner coating layer. The ceramic body has a heat generation resistor. The outer coating layer and the inner coating layer contain glass as a main component and coat a surface of the ceramic body. The outer coating layer and the inner coating layer are formed so that the inner coating layer is thinner than the outer coating layer.

The present invention relates to a water heating system (part number lacubucci HF Aerospace AS0012480) for beverage dispensing machines. The heater has a double system: a pre-chamber, preferably of the spirally wound type, for pre-heating the water along a predefined path, and a chamber which is always full of water heated with resistors making direct contact with the water (or in some cases with a protection jacket) for maximizing the efficiency.

A fluid-heating device for heating fluid includes a heater unit configured to have a heater and a heating portion, the heating portion being formed as to cover surrounding of the heater, wherein the heating portion has an inner heat exchange surface formed on an inner surface of a through hole penetrating through an inner side of the heater and an outer heat exchange surface formed on an outer-wall portion of an outer side of the heater, the inner heat exchange surface being configured to perform heat exchange with the fluid, and the outer heat exchange surface being configured to perform the heat exchange with the fluid.

A fluid-heating device for heating fluid includes a heater unit configured to have a heater and a heating portion, the heating portion being formed as to cover surrounding of the heater, wherein the heating portion has an inner heat exchange surface formed on an inner surface of a through hole penetrating through an inner side of the heater and an outer heat exchange surface formed on an outer-wall portion of an outer side of the heater, the inner heat exchange surface being configured to perform heat exchange with the fluid, and the outer heat exchange surface being configured to perform the heat exchange with the fluid.

The present invention provides a fine bubble generating apparatus capable of generating fine bubbles efficiently. The present invention includes a fluid flow passage that includes a narrow portion in at least a part thereof, a heating part capable of heating a liquid flowing through the fluid flow passage, and a controlling unit that controls the heating part. The controlling unit controls the heating part to generate film boiling in the liquid to generate ultrafine bubbles.

A heating device intended to heat body, such as fluid contained in fluid circuit, the device including at least one electric heating element, as well as at least one control module to electrically power the heating element, the heating element being formed by propulsive winding circuit of direct-current electric motor which, when it is electrically powered by a direct supply voltage, generates drive force which tends to drive the motor in direction of displacement determined by the polarity of the supply voltage, and the control module including activation mode called heating oscillating mode, according to which the control module causes a warm-up of the propulsive winding circuit by Joule effect by applying at the terminals of the winding circuit an alternating supply voltage whose polarity switches, alternately and automatically, according to predetermined frequency called heating frequency, from a first polarity to opposite second polarity.

A heater system is provided, which includes a plurality of heaters, a controller for supplying power to the plurality of heaters, a plurality sets of auxiliary wires extending from the plurality of heaters, and a wire harness for connecting the plurality sets of auxiliary wires to the controller. Each set of auxiliary wires includes three wires, two of the three wires being made of different materials and being joined to form a thermocouple junction, such that each of the plurality of heaters is operable to function as both a heater and a temperature sensor.

A heater system is provided, which includes a plurality of heaters, a controller for supplying power to the plurality of heaters, a plurality sets of auxiliary wires extending from the plurality of heaters, and a wire harness for connecting the plurality sets of auxiliary wires to the controller. Each set of auxiliary wires includes three wires, two of the three wires being made of different materials and being joined to form a thermocouple junction, such that each of the plurality of heaters is operable to function as both a heater and a temperature sensor.