A tubular heat exchanger employing radially arranged heat exchange tubes surrounding and attached to a center tube enclosing a heat source by an annular top flange attached to a removable top cover above the tube arrangement. The heat exchange tubes are connected at the bottom to an exhaust collection manifold which is in turn connected to an exhaust outlet pipe vented to the atmosphere. As heated fluid ascends inside the center tube, it is forced outwardly inside the top cover, apportioning the heated fluid into equally spaced radially arranged heat exchange tubes. The heated fluid descends inside the heat exchange tubes, disbursing heat outwardly through the walls of the heat exchange tubes into the ascending heat transfer fluid. The mostly cooled heated fluid is collected and recombined in the exhaust collection manifold and into the exhaust outlet pipe. The heat transfer fluid ascends above the top cover for final utilization.

A tubular heat exchanger employing radially arranged heat exchange tubes surrounding and attached to a center tube enclosing a heat source by an annular top flange attached to a removable top cover above the tube arrangement. The heat exchange tubes are connected at the bottom to an exhaust collection manifold which is in turn connected to an exhaust outlet pipe vented to the atmosphere. As heated fluid ascends inside the center tube, it is forced outwardly inside the top cover, apportioning the heated fluid into equally spaced radially arranged heat exchange tubes. The heated fluid descends inside the heat exchange tubes, disbursing heat outwardly through the walls of the heat exchange tubes into the ascending heat transfer fluid. The mostly cooled heated fluid is collected and recombined in the exhaust collection manifold and into the exhaust outlet pipe. The heat transfer fluid ascends above the top cover for final utilization.

An air-heating type heat not burn heating device, a ceramic heating element and a preparation method thereof are provided. The ceramic heating element includes a honeycomb ceramic body and a heating printed circuit. Porous channels are arranged in the honeycomb ceramic body, and the porous channels are circular holes or polygonal holes. The heating printed circuit is arranged around an outer surface of the honeycomb ceramic body to heat the air passing through the porous channels. According to the ceramic heating element, the surface made of high purity alumina honeycomb ceramic has high compactness, it is able to effectively prevent absorption of smoke dust particles, thus to effectively preventing odd smell; the high-purity alumina honeycomb ceramic has good thermal conductivity, with a thermal conductivity of 33 W/mk; the wall thickness and pore diameter in the honeycomb ceramic structure are both very small, and the thermal conductivity is extremely excellent.

A control system for controlling a gas powered appliance includes a hot surface igniter, an igniter relay, and an integrity detection circuit. The integrity detection circuit is configured to be coupled to a power source, the igniter relay, and the hot surface igniter to produce an output indicative of the integrity of the hot surface igniter and the igniter relay. The integrity detection circuit is configured to output a first voltage when the igniter relay is closed and output a second voltage different from the first voltage when the hot surface igniter is in a non-short circuit failure condition.

A hot-air blower comprises a heat lamp with a rated power consumption of 180 W to 380 W, a lampshade having a socket for the heat lamp, a cylindrical outer casing with an inner diameter larger than a largest outer diameter of the lampshade, a lampshade fixing part coupled with the lampshade and fastened to the outer casing to allow the lampshade to be provided on a central axis of the outer casing, an impeller generating an air flow by rotation, a waterproof motor coupled with the impeller to rotate the impeller, and a motor fixing part coupled with the waterproof motor.

A sensor cleaning system for a vehicle is disclosed. In particular, the sensor cleaning system has anti-freezing and defrosting functions. The sensor cleaning system includes: an air tank configured to store compressed air; a heating element disposed in the air tank and configured to apply heat to the air tank; and a controller configured to operate the heating element when a preset condition is satisfied.

An electric radiator is provided. The electric radiator includes: a housing provided with an air channel cover therein; a heating assembly disposed in the housing and defining a natural convection air channel with the air channel cover, an air supply inlet being formed at a first end of the natural convection air channel and an air supply outlet being formed at a second end of the natural convection air channel above the air supply inlet, air in the natural convection air channel being heated by the heating assembly to form a natural convection in the natural convection air channel; a mesh hood mounted onto a front surface of the housing and covering the heating assembly and the air supply outlet; a first temperature limiter mounted onto the heating assembly and adjacent to the air supply outlet in an up-down direction.

A heating module is provided by the present application, which includes a heat insulating tube, wherein a ventilation separator dividing the heat insulating tube into an upper tube chamber and a lower tube chamber is disposed therein, and a plurality of air guiding holes are provided in the ventilation separator, and an air intake structure is configured in the lower tube chamber; a receiving tube disposed inside the upper tube chamber, and an air heating assembly, wherein the air heating assembly is disposed inside the lower tube chamber.

A system is provided for heat recovery from shower greywater. An outlet for greywater is connected to a heat exchanger's inlet for greywater and the heat exchanger is designed so that a cold supply water flows in the opposite direction through the heat exchanger relative to the relatively hot greywater, so that heat exchange works under a counterflow principle and heat energy is transferred from the hot greywater to the cold supply water. A manifold having a nozzle outlet for hot supply water is connected to a waste pipe so that the manifold nozzle outlet for hot supply water opens into the waste pipe at a position downstream of the waste pipe inlet for greywater but upstream of the waste pipe outlet for greywater.

A heat emitting radiator for heating a space is provided that includes a radiator panel with tubing forming a fluid circuit or loop, wherein the loop includes at least one opening for inserting a heating element that can heat a fluid in the fluid circuit. The radiator may also include a heat absorbing material, such as stone, in thermal contact with the radiator panel. The radiator can be selectively de-activated when a certain temperature has been achieved in the space or in the fluid, allowing heat absorbed by a heat absorbing material positioned within the radiator to then be radiated into the space. The radiator can then be re-activated when a selected low temperature has been reached. The heating element may be a DC electrical heating element configured to be connected to an AC power source.