34 results about "Thermoelectric efficiency" patented technology

The inventors demonstrate herein that homogeneous Ag-doped PbTe/Ag₂Te composites exhibit high thermoelectric performance (˜50% over La-doped composites) associated with an inherent temperature induced gradient in the doping concentration caused by the temperature-dependent solubility of Ag in the PbTe matrix. This method provides a new mechanism to achieve a higher thermoelectric efficiency afforded by a given material system, and is generally applicable to other thermoelectric materials.

The invention provides a tower solar thermal power plant utilizing a supercritical water heat absorber and molten salt heat storage. The tower solar thermal power plant comprises a condensate pump, a deaerator, a water supply pump, the supercritical water heat absorber, a molten salt heat storage system, a steam turbine, a power generator and a condenser; the molten salt heat storage system comprises a water and molten salt heat exchanger, an expanding device, a cold salt tank, a hot salt tank, a cold salt pump, a hot salt pump and a molten salt and water heat exchanger; the condensate water is heated through the deaerator and input into the supercritical water heat absorber through the water supply pump, the solar radiation is absorbed, and the deaerated water is converted into the supercritical water to enter into the steam turbine to for work applying and power generation. The tower solar thermal power plant is combined with the work applying and power generation of the supercritical water and the molten salt heat storage and accordingly the tower solar thermal power plant can be suitable for various solar radiation conditions and the thermoelectric conversion efficiency is high; the work applying of the supercritical water is high in efficiency and free of phase change and accordingly the high thermoelectric efficiency can be guaranteed through a simple single-stage heat storage system; meanwhile the risk that the molten salt is solidified in the upper tower process is voided in comparison with a molten salt heat absorber.

The invention relates to a new solar energy thermal supercritical low-temperature air energy power generator which comprises a heat absorber, an expansion generator unit, a heat regenerator, a cooler, a booster pump, a refrigerator and pipeline accessories thereof and a detection and control device; and a nitrogen or mixed working medium is filled in a closed system. The working medium becomes high-pressure supercritical fluid through passing through the heat absorber, also becomes a working medium in the supercritical state through the work application and power generation of the expansion generator unit, is pressed into the heat regenerator by the booster pump for heat exchange through being condensed by the heat regenerator and the cooler and then is thermally absorbed by the heat absorber to form a closed cycle power generation system. The power generator also can be used for low-temperature heat source power generation in excess heat, waste heat, terrestrial heat and the like; and the working medium adopts carbon dioxide or mixed working medium. The supercritical low-temperature air energy power generator can generate cool air. With the adoption of the supercritical low-temperature air energy power generator, the working medium is condensed under the supercritical state, release a small quantity of heat and can circularly utilize the condensation heat. Therefore, the supercritical low-temperature air energy power generator has high thermoelectric efficiency, high energy conversion density, low unit power investment and low cost and uses less power during the cool air generation process. The supercritical low-temperature air energy power generator successfully breaks through the key technical difficulty of low thermal efficiency during the low-temperature solar energy thermal power generation.

The invention discloses a friction nanometer power generation system driven by a thermo-acoustic engine. The friction nanometer power generation system comprises the thermo-acoustic engine and a friction nanometer power generator unit (2) installed in a resonance tube (4) which is connected with the thermo-acoustic engine. According to the friction nanometer power generation system, external heat energy is converted to sound energy by utilizing the thermo-acoustic engine, then the sound energy is converted to electric energy by utilizing the friction nanometer power generation system to be output. The whole system has the advantages of compact structure, high reliability, high potential thermoelectric efficiency and the like. Compared with the thermo-acoustic power generation technology by adopting a linear motor, the friction nanometer power generation system has the advantages of low cost, simple structure, high integration level, many preparation material types and the like. Compared with the traditional friction nanometer power generator, driven by the thermo-acoustic engine, the friction nanometer power generation system can realize stable and continuous thermoelectric conversion.

The invention provides a novel minisize thermoelectric generator with better combustion stability, combustion efficiency and thermoelectric efficiency than the prior minisize generating system. The minisize thermoelectric generator comprises a combustor and a thermoelectric module, wherein the combustor uses dimethyl ether as fuel; the inner cavity of the combustor is divided into a first gas inlet cavity, a second gas inlet cavity and a combustion chamber by a first multihole plate and a second multihole plate which are parallel and aligned; the combustion chamber is positioned between the first multihole plate and the second multihole plate; an exhaust channel just faces the center between the first multihole plate and the second multihole plate and is communicated with the combustion chamber; the exhaust channel and the heat end of the thermoelectric module are used for heat transmission; and the cold end of the thermoelectric module is provided with a water cooler. Compared with the prior thermoelectric generators, the minisize thermoelectric generator has the advantages of small size, high heat conversion efficiency and greatly enhanced performance, and is worthy of wide popularization.

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.

The invention relates to a device (1) for generating electric energy, comprising at least one heated heat-conducting base (2) having at least one projection (3) and thermoelectric elements (4) which are laterally attached to the at least one projection (3), a thermoelectric efficiency of every thermoelectric element (4) and a thermal capacity of the at least one projection (3) being matched to each other.

The invention discloses a point-line focusing combined solar thermal power generation system and method. A low-temperature heat collection section utilizes the characteristics of low temperature and high mirror field efficiency of line focusing to replace a preheater, a high-temperature section adopts the characteristics of high temperature and high thermoelectric efficiency of point focusing, the height of a point focusing heat absorber is reduced, and the mirror field efficiency is improved. The point-line focusing combined solar thermal power generation system is high in integration efficiency, small in loss and low in cost.

The invention relates to a low-grade waste heat recovery antimonide thermoelectric module with high conversion efficiency and a preparation method thereof. The thermoelectric module comprises an insulating heat-conducting ceramic plate and an n-p thermoelectric unit which is fixed on the insulating heat-conducting ceramic plate and is connected in series by a metal diversion layer. The n-type thermoelectric element is composed of Ni/Fe/Mg3SbBi/Fe/Ni, and the p-type thermoelectric element is composed of Ni/Sb/CdSb/Sb/Ni. The thermoelectric material selected by the thermoelectric device belongs to antimonide, the composition elements of the thermoelectric material have the characteristics of high abundance and low price, and the thermoelectric material has thermoelectric performance comparable to that of a commercial Bi2Te3-based material. Compared with a traditional commercial Bi2Te3-based thermoelectric device, the thermoelectric device has the advantages of being high in conversion efficiency, wide in application temperature range, high in power-price ratio and the like, and the thermoelectric efficiency of the thermoelectric device is the highest value of the thermoelectric efficiency of a low-grade waste heat recovery temperature range at present. In addition, the thermoelectric module has relatively high thermal stability, the machinability of thermoelectric elements is high, and a necessary condition for realizing large-scale production and application is achieved.

The circuit board mainly comprises an interconnection base, a thermoelectric conductor, a joint layer, a top buffer layer, at least one heat conduction adulteration and a top routing layer. An interconnect base is attached around the peripheral sidewall of the thermoelectric conductor by a bonding layer, and a top buffer layer mixed with a thermally conductive admixture overlies the thermoelectric conductor and the interconnect base and is located between the top routing layer and the interconnect base/thermoelectric conductor. The top buffer layer has an elastic modulus smaller than that of the thermoelectric conductor, so that a stress buffer effect can be provided. The thermally conductive admixtures dispersed in the top buffer layer facilitate conduction of heat generated by a device assembled on the top routing layer from the top routing layer to the thermoelectric conductor. Therefore, the circuit board provided by the invention can show excellent thermoelectric efficiency and reliability.

The present invention relates to thermoelectric power generating devices using thermoelectric elements and thereby generating electricity realizing direct conversion of heat to electric power due to difference in temperature. The present invention is targeted on improving thermoelectric efficiency of a thermoelectric device. According to the first variant of the present invention, technical result is achieved by that a) in thermoelectric element consisting of p-type leg and n-type leg jointed in serial electrical circuit, p-type leg is made of polycrystalline textured semiconductor Bi₂Te₃—Sb₂Te₃ alloy with high thermoelectric efficiency in the operating temperature range T>100° C. and b) in p-type leg, heat flux is directed from the hot end to the cold end parallel the crystallographic axis C. According to the second variant of the present invention, technical result is achieved by that a) in thermoelectric element consisting of p-type leg and n-type leg jointed in serial electrical circuit, p-type leg is made of polycrystalline textured semiconductor Bi₂Te₃—Sb₂Te₃ alloy and built up of two parts which are in perfect electrical and thermal contact and b) in part of p-type leg at low-temperature end of thermoelectric element, heat flux is directed from the hot end to the cold end transverse the crystallographic axis C, while in part of p-type leg at high-temperature end of thermocouple, heat flux is directed from the hot end to the cold end parallel the crystallographic axis C.

The invention discloses a water electrolysis hydrogen production system performance optimization method suitable for volatility input, and aims to solve the problem that performance optimization of a water electrolysis hydrogen production system suitable for volatility input cannot be realized, and the method comprises the following steps: S1, establishing a key equipment model according to a multi-energy conversion and energy transmission mechanism; s2, analyzing the output characteristics of the key parameters to the system according to the key equipment model; s3, optimizing the system flow based on the wide power regulation range and the output characteristics of the system; and S4, carrying out optimization matching on the key parameters of the key equipment. The method has the advantages that by analyzing the influence rule of key parameters and combining the service life of equipment, thermoelectric efficiency and safety constraints, the layered parameter optimization of a system and components under all working conditions can be carried out; load loading and solving can be carried out through the established electrolytic cell finite element model, an expected simulation result is obtained and analyzed, and therefore the optimization design of electrolytic cell grouping is achieved.

The invention relates to an SOFC (Solid Oxide Fuel Cell) combined heat and power system capable of improving heat efficiency and optimizing water management, which is characterized in that combustion tail gas sequentially preheats air, reforming reaction, fuel, reforming water and domestic water, so that the comprehensive recycling of energy and water contained in the combustion tail gas is realized, the water and heat management of the system is optimized, and the thermoelectric efficiency of the system is effectively improved. According to the system, the assembly layout and the heat exchange process are optimized, the waste heat recovery heat exchanger and the condenser are additionally arranged, heat energy in tail gas is recovered through cooling water, and external heat supply is achieved; by additionally arranging the water storage tank, the circulating pipeline and the electromagnetic control valve, water in tail gas can be recycled. Water and heat management in the system operation process can be optimized, the heat efficiency of the system is greatly improved, the water consumption of the system is reduced, and the operation cost is reduced.