62results about How to "High thermoelectric efficiency" patented technology

Methods and devices for controlling thermal conductivity and thermoelectric power of semiconductor nanowires are described. The thermal conductivity and the thermoelectric power are controlled substantially independently of the electrical conductivity of the nanowires by controlling dimensions and doping, respectively, of the nanowires. A thermoelectric device comprising p-doped and n-doped semiconductor nanowire thermocouples is also shown, together with a method to fabricate alternately p-doped and n-doped arrays of silicon nanowires.

A thermoelectric module with a simple structure with less breakage by thermal stress is provided. For this purpose, the thermoelectric module includes p-type and n-type thermoelectric elements (13, 14) which are alternately placed, and outer electrodes (15) and inner electrodes (16), which are alternately placed between the thermoelectric elements (13, 14), and at least part of at least either one of the outer electrode (15) or the inner electrode (16) has a shape approximately along an object which exchanges heat with the electrodes (15, 16). The inner electrodes (16) surround an object which exchanges heat with the electrodes (15, 16).

A thermoelectric module and methods for making and applying same provide an integrated, layered structure comprising first and second, thermally conductive, surface volumes, each in thermal communication with a separate respective first and second electrically conductive patterned trace layers, and an array of n-type and p-type semiconducting elements embedded in amorphous silica dielectric and electrically connected between the first and second patterned trace layers forming a thermoelectric circuit.

The invention discloses a system for performing power generation by utilizing a liquid thermoelectric effect. The system consists of a high-temperature circulation loop, a liquid thermoelectric power generation system and a low-temperature circulation loop; the high-temperature circulation loop is provided with a heat exchanger; heat exchange is performed between low-temperature heat energy in a factory or an environment and a thermal circulation working medium in the heat exchanger; a condenser is arranged in the low-temperature circulation loop; a low-temperature circulation working medium is cooled in the condenser; when an ion exchange membrane is an anion-exchange membrane, the high-temperature circulation loop and the low-temperature circulation loop respectively pass the anode and the cathode of a liquid thermoelectric power generation unit. The system disclosed by the invention has lower requirement on the temperature of the heat energy, can normally operate as long as two ends of the liquid thermoelectric power generation unit have temperature difference, and has a great prospect in the recycling aspect of power plant and factory waste heat and seawater low-temperature heat energy; moreover, the system disclosed by the invention is higher in utilization efficiency of the heat energy, lower in cost and extremely environment friendly.

The invention relates to a flexible thermoelectric generator and a manufacturing method thereof. According to the technical scheme provided by the invention, the flexible thermoelectric generator comprises a first flexible substrate and a second flexible substrate located under the first flexible substrate, wherein a plurality of N type thermoelectric material particles and P type thermoelectric material particles, which are alternately distributed, are arranged between the first flexible substrate and the second flexible substrate; the N type thermoelectric material particles are electrically connected with the P type thermoelectric material particles in series through a first electrical connection layer on the first flexible substrate and a second electrical connection layer on the second flexible substrate, so that a plurality of thermoelectricity paired thermoelectric materials is formed between the first flexible substrate and the second flexible substrate; and the thermoelectric materials are packaged between the first flexible substrate and the second flexible substrate through flexible insulation and thermal insulation encapsulating materials. The flexible thermoelectric generator has a simple and convenient process, low manufacturing cost, high generating efficiency, and capability of being bent moderately, the application range is broadened, and the safety and the reliability are realized.

The invention relates to a transcritical low-temperature air energy generating set for new energy resource. The workflow of the transcritical low-temperature air energy generating set is as follows: after being pressurized by a booster pump, liquid working medium flows to a heat exchanger to output cold, is then turned into high-pressure supercritical fluid by a heat absorber, and expands to do work to generate electricity, part of the working medium is condensed by the heat exchanger, and then flows to the booster pump, and thereby an electricity-generating circulation system is formed; part of the working medium is throttled, expanded, cooled and depressurized to output cold, is then pressurized and cooled, and then flows to a throttle valve, and thereby a condensation circulation system is formed. The transcritical low-temperature air energy generating set also can be used for generating electricity with medium- and low-temperature heat sources such as residual heat, waste heat and terrestrial heat. The transcritical low-temperature air energy generating set condenses the working medium under the critical state, the cold in the system is sufficiently recycled, the power consumption of circulation is minimum, an outside cold source is not needed, the thermoelectric efficiency is high, the energy conversion density is high, the unit power investment is low, the cost is low, and the production of the cold air does not consume electricity. The transcritical low-temperature air energy generating set successfully breaks through the key difficult technology of low-temperature solar thermal power generation in terms of low thermal efficiency.

A vehicle seating assembly includes a seating surface and a tube arranged proximate the seating surface. The tube has an inlet fluidly coupled with a fluid mover and an outlet proximate the seating surface. A thermoelectric device is in communication with the outlet. The thermoelectric device is configured to thermodynamically affect heat exchange at the seating surface. The fluid mover is selectively operable to release a pressurized fluid through the tube proximate the thermoelectric device.

The invention discloses a turbine, comprising: a motor casing, a volute casing and a working medium pump casing; a stator assembly arranged on the inner wall of the motor casing; a rotor shaft; a front radial permanent magnetic bias magnetic suspension bearing and a rear Radial permanent magnetic bias magnetic suspension bearings, front radial permanent magnetic bias magnetic suspension bearings and rear radial permanent magnetic bias magnetic suspension bearings are arranged on the motor housing to support the rotor shaft; axial permanent magnetic bias magnetic suspension bearings, axial permanent magnetic bias magnetic suspension bearings, The permanent magnetic bias magnetic suspension bearing is set on the motor casing to limit the axial displacement of the rotor shaft; the expansion turbine is located in the turbine working chamber, and the gaseous working medium enters the turbine working chamber from the intake passage, and the expansion turbine is After doing work, it is discharged from the exhaust passage; the centrifugal impeller is arranged at the front end of the rotor shaft of the working medium pump and is located in the third installation space. The turbine according to the invention has simple structure, low cost and high thermoelectric efficiency.

The invention provides a multi-level doped PbTe-based thermoelectric material and a preparation method thereof. A molecular formula of the multi-level doped PbTe-based thermoelectric material is InxPb1-xTe1-yAy, wherein A is Cl, Br, I, Ga or Al; x is greater than 0 and less than or equal to 0.02; and y is greater than 0 and less than or equal to 0.03. According to the technical scheme, simultaneous doping of deep and shallow levels is adopted; carrier concentration at a low temperature is increased by utilizing shallow level doping; carrier concentration at a high temperature is increased by utilizing deep level doping; an ambipolar diffusion temperature is increased; and the thermoelectric material with a high thermoelectric merit figure within a wide temperature range is finally obtained. The thermoelectric efficiency of the material is improved.

Provided is a thermoelectric device including two legs having a rough side surface and a smooth side surface facing each other. Phonons may be scattered by the rough side surface, thereby decreasing thermal conductivity of the device. Flowing paths for electrons and phonons may become different form each other, because of a magnetic field induced by an electric current passing through the legs. The smooth side surface may be used for the flowing path of electrons. As a result, in the thermoelectric device, thermal conductivity can be reduced and electric conductivity can be maintained.

Provided is a thermoelectric material including metal oxide powder and thermoelectric powder. Thus, an internal filling rate is improved so that a Peltier effect can be maximized according to the increase of electrical conductivity and a Seebeck coefficient and the reduction of thermal conductivity, thereby enabling the improvement of the figure of merit (ZT) of a thermoelectric element.

The invention relates to the field of Rankine cycles, in particular to a Rankine cycle system based on a pump-free ejection pressurization technology and a cycle method thereof. The system comprises agenerator, an expansion machine and a condenser, and further comprises a liquid storage tank and pressurization modules, wherein the generator, the expansion machine, the condenser, the liquid storage tank and the pressurization modules are sequentially connected to form a closed-loop cycle system, liquid outlets of the pressurization modules are connected with a liquid inlet of the generator, anair outlet of the generator is connected with an air inlet of the expansion machine, an air outlet of the expansion machine is connected with an air inlet of the condenser, a liquid outlet of the condenser is connected with a liquid inlet of the liquid storage tank, a liquid outlet of the liquid storage tank is connected with the two pressurization modules, and the liquid outlets of the two pressurization modules are connected with the liquid inlet of the generator. The Rankine cycle system and the cycle method thereof can utilize widely existing low-grade heat energy such as ocean temperature difference energy, flue gas waste heat and geothermal energy to drive an organic Rankine working medium to output work, do not need use of electric power to drive a pump, and are low in cost and high in efficiency.

The invention discloses a molten carbonate fuel cell system combined with CO2 capture and a working method thereof, and belongs to the technical field of fuel cells. The system mainly comprises a methanol reforming hydrogen production unit, a first heat exchange unit, a gas-liquid separation unit, a mixing device, a CO2 capture unit, a second heat exchange unit, a third heat exchange unit and a fuel cell unit. Methanol reformed gas is used as a fuel, a CO2 capture technology is utilized and anode tail gas circulation is combined, so that CO2 separation efficiency and fuel utilization rate can be improved, power generation cost of the molten carbonate fuel cell is reduced, tail gas waste heat can be utilized to preheat inlet gas, thermoelectric comprehensive efficiency of a power generation system of the molten carbonate fuel cell is improved. The power generation cost of the molten carbonate fuel cell is reduced, and the application prospect is good.