Systems and methods of manufacture of radiator fins. In one embodiment, a radiator fin made of carbon fiber is provided. In one aspect, the radiator fin is made of carbon fibers forming an interlaced pattern. In another aspect, the interlaced carbon fiber radiator fin is attached directly to a heat pipe, the heat pipe connected to a heat source.

A reaction device is provided with a first wall that defines an interior in which a stirring mechanism is located. A heat exchanger is at least partly provided on the first outer wall surface facing away from the interior and/or on the stirring mechanism, wherein the heat exchanger has a grate structure, and at least two layers are provided which have a grate structure. Thus, it is possible to transfer heat in a precise and efficient manner primarily by means of thermal radiation in endothermic processes at different temperature levels, in particular pyrolysis, gassing, and reforming processes, and thereby use the exhaust heat for other processes.

A conical refrigerant coil comprises a plurality of pipes, each pipe arranged in a conical spiral and each pipe comprising a plurality of loops. At least some of the loops of each pipe of the plurality of pipes are arranged alternatingly along at least a portion of a length of the coil.

One example provides a cooling system, including: a first side configured to face an ambient environment; a second side configured to face an enclosure interior; a flange that surrounds the system and is configured for attachment to an opening of the enclosure; a thermostat; one or more fans; one or more compressors; and a controller configured to: utilize two or more set points and input from the thermostat to variably control the one or more fans and one or more compressors using variable direct current (VDC).

A heat exchanger (100) and an air-conditioning system. The heat exchanger (100) comprises: a group of first heat exchange tubes (T1) for forming a first loop (C1); a group of second heat exchange tubes (T2) for forming a second loop (C2); and a group of fins (3), at least a plurality of fins (3) in the group of fins (3) being in contact with both at least a plurality of first heat exchange tubes (1) in the group of first heat exchange tubes (T1), and at least a plurality of second heat exchange tubes (T2) in the group of second heat exchange tubes (T2). If one loop of an air-conditioning system having two loops is closed, heat exchange regions of the fins for the loop can be used in the other loop, thereby improving the heat exchange efficiency of a heat exchanger.

Improved heat exchangers according to several embodiments are provided. The heat exchangers provide improved heat transfer for air flow in wet and dry operating conditions, while minimizing pressure drop across the heat exchanger in some applications. According to one embodiment, an improved heat exchanger includes a plurality of metal foam fins between adjacent heat exchange conduits, the heat exchange conduits being arranged parallel to each other to define parallel flow paths between an inlet header and an outlet header. The metal foam fins occupy a cross-flow region between adjacent conduits, the fins having a fixed angular orientation or being rotatable in unison to vary the thermal capacitance of the heat exchanger.

Vessel assemblies, heat transfer units for prefabricated vessels, and methods for heat transfer prefabricated vessel are provided. A heat transfer unit includes a central rod, and a plurality of peripheral rods surrounding the central rod and connected to the central rod. The plurality of peripheral rods are movable between a first collapsed position and a second bowed position, wherein in the second bowed position a midpoint of each of the plurality of peripheral rods is spaced from the central rod relative to in the first position. The heat transfer unit further includes a heat transfer element connected to one of the plurality of peripheral rods.

Disclosed is a technology based upon the nesting of tubes to provide chemical reactors or chemical reactors with built in heat exchanger. As a chemical reactor, the technology provides the ability to manage the temperature within a process flow for improved performance, control the location of reactions for corrosion control, or implement multiple process steps within the same piece of equipment. As a chemical reactor with built in heat exchanger, the technology can provide large surface areas per unit volume and large heat transfer coefficients. The technology can recover the thermal energy from the product flow to heat the reactant flow to the reactant temperature, significantly reducing the energy needs for accomplishment of a process.

A refrigerant coil comprises a first pipe, a second pipe substantially parallel to the first pipe, and a plurality of coil segment pipes substantially parallel to each other. Each coil segment pipe has a first end connected to and in fluid communication with the first pipe and a second end connected to and in fluid communication with the second pipe. Each coil segment pipe forms a spiral with the first end being an outer end of the spiral and the second end being an inner end of the spiral such that the second pipe extends through a center of each of the coil segment pipe.

The invention is applicable to the technical field of heat sinks, and provides a heat dissipating device and a vending machine. The heat dissipating device comprises a fan, a fan motor and a heat dissipating cavity; the fan is connected with the fan motor, and the heat dissipating cavity comprises a first end surface close to the fan and away from the fan. a second end surface; the first end surface and the second end surface further comprise a plurality of sets of heat dissipating copper tubes parallel to the first end surface and disposed in the same direction, and the heat dissipating copper tubes in each set of heat dissipating copper tubes are parallel to each other, and the same group of heat dissipating The copper tube is also covered with a wide gap metal mesh; wherein the fan motor is a positive and negative motor; when the vending machine refrigeration system is started, the fan motor is reversed within a preset time to drive the fan to reverse, so that the heat dissipation cavity is obtained. Wind power from the first end to the second end. The invention can clean the heat sink in time, so that the vending machine refrigeration system can operate stably and efficiently.