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 is a thermal electric generating device, mainly using a heat collector able to absorb thermal energy to transfer the thermal energy to a cooling wafer group, so as to make the wafer group able to generate DC by thermoelectric effect to be stored in an accumulator, or then converting DC into AC by power supply converter for general electric appliances, in addition the heat collector can quickly conduct heat by heat collecting body and maintain thermal energy, besides the cooling wafer group can continuously send out thermal energy by cooling device, which can maintain the temperature difference between the heat collecting body and cooling wafer group to continuously produce electric energy.

The invention relates to the technical field of thermo-acoustic generator devices, in particular to a multistage thermo-acoustic generator set and a multistage heat generative refrigeration system provided with the same. The multistage thermo-acoustic generator set comprises a plurality of sets of thermo-acoustic engines which are sequentially connected between a compressor and a generator in series. Every two adjacent sets of thermo-acoustic engines are coupled through a harmonic oscillator assembly. The harmonic oscillator assemblies are used for enabling travelling wave sound fields to be formed in the corresponding sets of thermo-acoustic engines simultaneously. Every two adjacent two sets of thermo-acoustic engines are matched well by utilization of one harmonic oscillator assembly. The travelling wave sound fields can be simultaneously formed in the multiple sets of the thermo-acoustic engines, so that the thermoelectric efficiency of the thermo-acoustic generator set is improved. Meanwhile, the working temperatures of the multiple sets of the thermo-acoustic engines are set to be different, and accordingly gradient utilization of different-grade heat energy can be further achieved through the multistage thermo-acoustic generator set, so that the multistage heat regenerative refrigeration system provided with the multistage thermo-acoustic generator set has the higher thermoelectric conversion efficiency.

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 thermoelectric device at least includes a ring-shaped insulative substrate and plural sets of thermoelectric thin film material pair (TEP) disposed thereon. The ring-shaped insulative substrate has an inner rim, an outer rim and a first surface. The sets of TEP electrically connected to each other are disposed on the first surface of the ring-shaped insulative substrate. Each set of TEP includes a P-type and an N-type thermoelectric thin film elements (TEE) electrically connected to each other. Also, the N-type TEE of each set is electrically connected to the P-type TEE of the adjacent set of TER When a current flows through the sets of TEP along a direction parallel to the surfaces of P-type and N-type thermoelectric thin film elements, a temperature difference is generated between the inner rim and the outer rim of the ring-shaped insulative substrate.

The invention discloses a supercritical carbon dioxide power circulating system and method for a fusion reactor. Aiming at different working medium conditions of different nuclear heat sources of a fusion reactor cladding layer, a divertor and a vacuum chamber, S-CO2 is heated by stage-by-stage heat regeneration on the high-pressure side and cooled by stage-by-stage heat regeneration on the low-pressure side through three stages, namely a low-temperature heat regenerator, a middle-temperature heat regenerator and a high-temperature heat regenerator; 20 percent of S-CO2 is selected to be cooledand then pressurized and heated so as to be used for heat regeneration of a low-temperature heater and cooling of the divertor and the vacuum chamber, so that the operation requirements of differentcooling media for different heat sources of three components in the reactor are met, a negative temperature effect during heat regeneration is avoided, the heat sources of all components in the reactor are effectively utilized, and the heat energy utilization efficiency is greatly improved; and compared with the current designs only using helium gas carrying cladding layer core heat and a Rankinecirculatory system with two-loop pressure water heat exchange to generate electricity, the thermoelectricity efficiency of the fusion reactor is improved to 41 percent from 30 percent, and the supercritical carbon dioxide power circulating system for the fusion reactor has the remarkable advantages of simple structure, low cost, high heat efficiency and the like.

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 which comprises a motor shell, a volute, a working medium pump shell, a stator assembly, a rotor shaft, a front radial permanent magnet biased magnetic suspension bearing, a rear radial permanent magnet biased magnetic suspension bearing, an axial permanent magnet biased magnetic suspension bearing, an expansion turbine body, and a centrifugal impeller. The stator assembly is arranged on the inner wall of the motor shell. The front radial permanent magnet biased magnetic suspension bearing and the rear radial permanent magnet biased magnetic suspension bearing are arranged on the motor shell so as to support the rotor shaft. The axial permanent magnet biased magnetic suspension bearing is arranged on the motor shell so as to limit axial displacement of the rotor shaft. The expansion turbine body is located in a turbine work chamber, a gaseous working medium enters the turbine work chamber from an air inlet channel and is exhausted out of an exhaust channel after doing work on the expansion turbine body. The centrifugal impeller is arranged at the front end of the working medium pump rotor shaft and located in a third mounting space. The turbine provided by the invention is simple in structure, low in cost and high in thermoelectric efficiency.

The invention relates to a flexible thermoelectric conversion system and a manufacturing method of the flexible thermoelectric conversion system. The flexible thermoelectric conversion system comprises a flexible thermoelectric generator and a flexible conversion circuit. The flexible thermoelectric generator comprises a first flexible substrate and a second flexible substrate. A plurality of alternately distributed N-type thermoelectric material particle bodies and P-type thermoelectric material particle bodies are arranged between the first flexible substrate and the second flexible substrate. After being connected with the P-type thermoelectric material particle bodies in series, the N-type thermoelectric material particle bodies are electrically connected with the P-type thermoelectric material particle bodies through a first conductive connecting layer on the first flexible substrate and a second conductive connecting layer on the second flexible substrate so as to form thermoelectric material bodies between the first flexible substrate and the second flexible substrate. The thermoelectric material bodies are packaged between the first flexible substrate and the second flexible substrate through flexible insulation heat-insulation potting material bodies. The flexible conversion circuit is electrically connected with the thermoelectric material bodies. The flexible thermoelectric conversion system has the advantages of simple and convenient process, low manufacturing cost, high generating efficiency, and safety and reliability, and the application range of thermoelectric generators is expanded.

A thermoelectric dehumidifying device includes a case, on which a first air inlet, a second air inlet, and an air outlet are provided, and in which a thermoelectric element, a condenser, a heatsink, and a fan are provided. The thermoelectric element has a cold surface, to which the condenser is connected, and a hot surface, to which the heatsink is connected. The fan is provided between the second air inlet and the heatsink. Airflow flowing through the condenser will be cooled and dehumidified. Each fin of the condenser has a downwardly inclined bottom side, which facilitates the dripping of the water droplets condensed thereon. Said airflow will be mixed with external airflow drawn in through the second air inlet, and then blown by the fan to flow through fins of the heatsink, bringing away heat effectively and therefore improving the dehumidifying efficiency of the device.

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.

The invention relates to the technical field of solar thermal power generation, in particular to a slot type concentrated solar Sterling power generation system. The system comprises a slot type solar thermal collector, a circulating pump and a free-piston Sterling generator, wherein the slot type solar thermal collector, the circulating pump and the free-piston Sterling generator communicate in sequence via a hot fluid delivery pipeline; the slot type solar thermal collector heats a heat transfer fluid therein by reflecting sunlight; the circulating pump drives the heat transfer fluid to circularly flow in a power generation loop; and the free-piston Sterling generator converts heat energy transferred by the heated heat transfer fluid into electric energy. The slot type concentrated solar Sterling power generation system is formed by combination of the slot type solar thermal collector and the free-piston Sterling generator which are relatively high in market maturity currently, and solves the problems that existing solar thermal power generation systems are complex in structure, large in initial investment and long in construction cycle.

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.

The Invention relates to a process for transforming heat and work in a thermoelectric cycle, wherein charge carriers of an electronic gas are cyclically subjected to at least a first and second (7) heat source. Thereby, heat is exchanged between elements of the cycle representing adjacent sections (c-d, d-a) of a thermodynamic representation of the thermoelectric cycle. The process can be performed without thermal loss and without thermal (entropy) degradation of the second source, which provides a thermoelectric efficiency higher than that of Carnot cycles.

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 relates to a heat collecting device for collecting heat of a disc type or tower type solar reflector. The heat collecting device has the characteristics of being high in heat collectingefficiency, high in heat collecting temperature and wide in range of heating media, and has important meaning in reducing photo-thermal power generation cost and improving the reliability and efficiency of a power plant. The heating heat transfer media can be water, conducting oil, fused salt, supercritical carbon dioxide, hydrogen, helium and the like. The device can be widely applied to the aspects of a drier, a large hot water project, large photo-thermal power generation and the like, can be combined together with a Stirling engine effectively to form a set of novel solar Stirling power generation system which is simple in structure, convenient to mount, flexible to build and short in building period, and has the characteristics of being good in reliability, flexible in power, high inefficiency, environment-friendly and the like.

The invention consists of a fuel pole compressor, a fuel pole heat-exchanger, a proton exchanging film fuel cell, an internal combustion engine, a gas air conditioner, a driver, a motor, an air pole heat-exchanger and an air pole compressor. The system fuel is hydrogen and using the electrochemical reaction of hydrogen and air in the fuel cell produces electric energy to drive buses, and the imperfect reaction hydrogen enters into the internal combustion engine for combustion to produce mechanical energy for providing buses with partial power, and meanwhile the produced gas for providing buses with hot / cold air through gas air conditioners.

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.

The invention discloses a small-size heat pump drying device realizing high-efficiency dehumidification. The device comprises a sealed drying chamber, a heat pipe heat exchanger, a thermoelectric module and a heat pump, wherein the heat pump comprises an expansion valve, an evaporator, a compressor, a first condenser and a second condenser which sequentially communicate with one another through apipeline so as to form a loop; the drying chamber is provided with an air inlet and an air outlet, wherein the air inlet and the air outlet mutually communicate through a drying channel, and a circulating fan is arranged in the drying channel; the evaporator is arranged in the portion, close to one side of the air outlet, in the drying channel, and the first condenser and the second condenser arearranged in the portion, close to one side of the air inlet, in the drying channel; a baffling plate is arranged in the drying channel, a heat pipe heat exchanger evaporation section, a thermoelectricmodule cold end, a thermoelectric module hot end and a heat pipe heat exchanger condensing section are arranged sequentially in the air advancing direction, and the evaporator is arranged between thethermoelectric module hot end and the heat pipe heat exchanger condensing section; and the drying channel is provided with a drainage port below the thermoelectric module cold end. According to the small-size heat pump drying device realizing high-efficiency dehumidification, air is dehumidify, the relative humidity of the air is reduced, and therefore the purpose of high-efficiency dehumidifyingand drying can be realized.