CN103078560A - Semiconductor temperature difference power generation system - Google Patents
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- CN103078560A CN103078560A CN2013100102015A CN201310010201A CN103078560A CN 103078560 A CN103078560 A CN 103078560A CN 2013100102015 A CN2013100102015 A CN 2013100102015A CN 201310010201 A CN201310010201 A CN 201310010201A CN 103078560 A CN103078560 A CN 103078560A
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Abstract
The invention discloses a semiconductor temperature difference power generation system, which comprises phase-change heat transfer structures and temperature difference power generation modules; each phase-change heat transfer structure is composed of an evaporating section and a condensing section, and working medium with high heat absorption capacity and less useful energy loss within a temperature range, which is chosen according to the optimal working temperature of thermoelectric material, is filled in the pipeline of the evaporating section; the phase-change heat transfer structures comprise a high-temperature phase-change heat transfer structure, a medium-temperature phase-change heat transfer structure and a low-temperature phase-change heat transfer structure; the thermoelectric materials with different optimal working temperatures, which correspond to the evaporating sections, are also chosen by the temperature difference power generation modules; thermoelectric material hot ends cling to the surfaces of the condensing sections, and thermoelectric material cold ends cling to the wall surfaces of cooling passages. The invention broadens the useable range of the phase-change heat transfer structures in the whole process of heat transfer, reduces the temperature difference between a heat source and a generator, and increases the energy utilization rate of the system, and the semiconductor temperature difference power generation system is mainly used for supplying electric energy to an automobile power system.
Description
Technical field
The invention relates to semiconductor power generation device, particularly a kind of heat energy with abandoned car tail gas is recycled, the semiconductor temperature difference power generating system that heat-exchange system is combined with thermo-electric generation system.
Background technology
The thermo-electric generation technology is to utilize the Seebeck effect of semi-conducting material, directly thermal power transfer is become the technology of electric energy.Along with social economy to the increasing of energy demand, the shortage of the energy, waste and environmental pollution are day by day serious.Semiconductor power generation device has shockproof, noiselessness, and compact conformation, the characteristics such as environmental protection and long service life, volume is changeable, and efficient is not affected by volume substantially.Utilize it to reclaim various waste heats, can reduce waste heat and directly be discharged into pollution and the waste that causes in the environment.Therefore, such technology has caused increasing attention.Be used widely in fields such as aviation, military affairs.At present, along with the increase of automobile quantity, the consumption of traditional fossil energy increases sharply, and resultant environment and energy problem highlight day by day, the thermo-electric generation technology can reduce the wasting of resources can produce again electric energy for automobile itself, is considered to utilize the effective way of automobile waste heat.
But temperature difference electricity generation device in actual applications efficient is also very low, and main cause is the available energy loss that the temperature difference causes more greatly in the restriction of semi-conducting material itself and the heat transfer process.Every kind of semi-conducting material has its optimum working temperature, and very large as vehicle exhaust variations in temperature in power generation process of thermal source.There is Japanese scholars to propose the concept of grade thermoelectric material for this reason, by being combined into functionally gradient material (FGM), makes the thermoelectric material that is applicable to the different temperatures zone single thermoelectric material in the temperature province of correspondence, keep the highest conversion efficiency of thermoelectric.Theoretical calculating shows that this method has improved the transfer ratio of material really.On this basis, the somebody proposes to set up the phase-change heat-exchange structure between exhaust gas channel and semiconductor temperature differential generating material, utilize the phase-change heat-exchange thermal resistance little, the characteristics that heat-transfer capability is high reduce the temperature difference between thermal source and the electric organ, further improve the energy utilization efficiency of whole system.But only adopt single working medium in this method, the heat transmission is subject to the restriction of working medium operating temperature range, for the vehicle exhaust that constantly changes as the temperature of thermal source, the effective working region of working medium is very narrow, if that is: select the working medium of higher phase transition temperature, when exhaust temperature is lower than the Working fluid phase changing temperature, the low temperature part can not be carried out phase-change heat-exchange, and select the lower working medium of phase transition temperature can cause to high-temperature part the waste of heat, therefore this method is improved effect and not obvious to whole system efficient.
Summary of the invention
Purpose of the present invention, that the phase-change heat-exchange structure that overcomes prior art adopts single working medium, the heat transmission is subject to the restriction of working medium operating temperature range, so that the lower shortcoming of whole system efficient, utilization has the phase-change heat-exchange of the phase-change heat-exchange working medium of different phase-change heat-exchange temperature, enlarge the scope of application of phase-change heat transfer structure in whole diabatic process, reduce thermal loss in the diabatic process to reach, improve the purpose of capacity usage ratio, provide a kind of by increase corresponding phase-change heat-exchange unit between exhaust gas channel and thermoelectric material high temperature heat source, and with thermoelectric material with different optimum working temperatures as thermo-electric converting material with the semiconductor temperature difference power generating system of vehicle exhaust as high temperature heat source.
The present invention is achieved by following technical solution.
A kind of semiconductor temperature difference power generating system, comprise phase-change heat transfer structure and temperature-difference power generation module, it is characterized in that, described phase-change heat transfer structure forms the high-temperature phase-change heat transfer structure by high temperature evaporation section 1-1, high temperature condensation segment 2-1, warm phase-change heat transfer structure in being formed by middle temperature evaporation section 1-2, middle temperature condensation segment 2-2, form the low temperature phase change heat transfer structure by low-temperature evaporation section 1-3, cryogenic condensation section 2-3, each group phase-change heat transfer structure is the circulatory system of a sealing;
Described temperature-difference power generation module forms the high temperature electricity generation module by high temperature thermoelectric material hot junction 3-1, high temperature thermoelectric material 4-1 and high temperature thermoelectric material cold junction 5-1, warm electricity generation module in being comprised of warm thermoelectric material hot junction 3-2, warm thermoelectric material 4-2, warm thermoelectric material cold junction 5-2 forms the low-temperature electricity-generating module by low-temperature thermoelectric material hot junction 3-3, low-temperature thermoelectric material 4-3, low-temperature thermoelectric material cold junction 5-3;
Described high temperature evaporation section 1-1, middle temperature evaporation section 1-2 and low-temperature evaporation section 1-3 are placed in the exhaust gas channel 6 according to exhaust temperature from high to low successively; High temperature, middle gentle low temperature temperature-difference power generation module that described high temperature thermoelectric material hot junction 3-1, warm thermoelectric material hot junction 3-2, low-temperature thermoelectric material hot junction 3-3 and high temperature thermoelectric material 4-1, warm thermoelectric material 4-2, low-temperature thermoelectric material 4-3 and thermoelectric material cold junction 5 form are separately positioned between corresponding high temperature condensation segment 2-1, the middle temperature condensation segment 2-2 or cryogenic condensation section 2-3, and the outer setting of thermoelectric material cold junction has cooling duct 9; Described high temperature, per two of middle gentle low temperature temperature-difference power generation module are one group with a cooling duct, are provided with two groups between each condensation segment;
The working temperature of described high-temperature phase-change heat transfer structure and high temperature thermoelectric material is usually at 400～500 ℃, select normal boiling point in this interval and the higher working medium of the latent heat of vaporization, case material is selected corrosion resistant plate, and the high temperature thermoelectric material is selected the high thermoelectric material of figure of merit in this temperature range;
The working temperature of described middle temperature phase-change heat transfer structure and warm thermoelectric material is usually at 250～400 ℃, select normal boiling point in this temperature range and the higher working medium of the latent heat of vaporization, housing adopts aluminium, stainless steel or carbon steel material, and warm thermoelectric material is selected the high thermoelectric material of figure of merit in this temperature range;
The working temperature of described low temperature phase change heat transfer structure and low-temperature thermoelectric material is usually below 250 ℃, adopt normal boiling point in this interval and the higher working medium of the latent heat of vaporization, case material is selected copper or the treated carbon steel of inwall, and low-temperature thermoelectric material is the high thermoelectric material of figure of merit in the interval for this reason.
Described phase-change heat transfer structure also can be comprised of two groups of high temperature and low temperature phase change heat transfer structure, and perhaps the phase-change heat transfer structure by many groups relevant temperature forms; Described temperature-difference power generation module and phase-change heat transfer structure adapt, and also can be comprised of two groups of high temperature and low-temperature electricity-generating module, and perhaps the temperature-difference power generation module by many groups relevant temperature forms.
Described cooling duct 9 both can adopt water-cooling pattern also can adopt air cooled mode.
Described high-temperature phase-change working medium is sodium, potassium, lithium, silver, caesium or rubidium, and the high temperature thermoelectric material is SiGe, CoSb
3, CeFe
3RuSb
12, oxide type thermoelectric material, skutterudite type thermoelectric material or Half-Heusler compound thermoelectric material.
Described middle temperature phase-change working substance is naphthalene, biphenyl, Dowtherm-A, Dowtherm-E or mercury, and warm thermoelectric material is PbTe, TAGS or AlPdMn.
Described low temperature phase change working medium is hexane, acetone, ethanol, methyl alcohol, toluene or the water after chemical treatment, and low-temperature thermoelectric material is Bi
2Te
3, Sb
2Te
3, metal alloy solid-solution material or BiSbTe.
Beneficial effect of the present invention, by in the phase-change heat transfer structure, using the different working medium of phase transition temperature, utilize it in specific range of temperatures, can reach caloric receptivity greatly and the little characteristics of available energy loss, heat is passed to the hot junction of semiconductor generator from high-temperature exhaust air, has increased the scope of application of phase-change heat transfer structure in whole diabatic process; By the optimization to semiconductor temperature difference power generating system, further reduce the temperature difference between thermal source and the electric organ, improved the capacity usage ratio of system; Simultaneously, the electrical power storage that changes in automobile storage battery, for the electric power system of automobile provides electric energy, has been saved the energy.
Description of drawings
Fig. 1 is the semiconductor temperature difference power generating system structural representation with 3 kinds of phase-change heat transfer structures of senior middle school's low temperature and 3 kinds of electricity generation modules of senior middle school's low temperature;
Fig. 2 is the vertical view of Fig. 1;
Fig. 3 is high-temperature phase-change heat transfer structure and the combined perspective view of high temperature electricity generation module;
Fig. 4 is the semiconductor temperature difference power generating system structural representation with 2 kinds of phase-change heat transfer structures of high temperature low temperature and 2 kinds of electricity generation modules of high temperature low temperature;
Fig. 5 is the vertical view of Fig. 4.
Reference numeral of the present invention is as follows:
1-1------high temperature evaporation section 2-1------high temperature condensation segment
1-2------the middle temperature condensation segment of middle temperature evaporation section 2-2------
1-3------low-temperature evaporation section 2-3------cryogenic condensation section
3-1------high temperature thermoelectric material hot junction 3-2------warm thermoelectric material hot junction
3-3------low-temperature thermoelectric material hot junction 4-1------high temperature thermoelectric material
4-2------warm thermoelectric material 4-3------low-temperature thermoelectric material
5-1------high temperature thermoelectric material cold junction 5-2------warm thermoelectric material cold junction
5-3------low-temperature thermoelectric material cold junction 6------exhaust gas channel
7------exhaust gas channel import 8------exhaust gas channel outlets
9------cooling duct 10------cooling water inlets
11------coolant outlet
Embodiment
At present, the energy that the motor vehicle fuel burning discharges only has the 34%-38%(diesel engine) or the 25%-28%(gasoline engine) be used effectively, other energy all are discharged in the environment with the form of heat energy, wherein only the rear exhaust heat of burning just accounts for the 30%-45% that enters the heat that fuel combustion produces in the engine, and EGT is up to 600～800 ℃, and temperature difference electricity generation device is used for exactly reclaiming this part heat and is used for generating.The efficient that reclaims in order to improve waste gas residual heat, reduce the temperature difference between tail gas and the electric organ, the phase-change heat transfer structure is used in employing between tail gas and electric organ, but vehicle exhaust temperature in discharge process reduces gradually and span is very large, therefore the caloric receptivity of selecting single working medium to be difficult to take into account as far as possible to improve the electric organ hot junction reduces again the heat transfer temperature difference between tail gas and the electric organ hot junction simultaneously as far as possible, so consider exhaust temperature is divided into several different temperature ranges, and for selecting the working medium that caloric receptivity is large and heat transfer temperature difference is little relatively to realize between tail gas and electric organ, carrying out phase-change heat transfer in the different temperatures interval, make each working medium can both bring into play its optimal performance, improve whole efficiency.
The semiconductor thermo-electric generation apparatus that the present invention uses comprises phase-change heat transfer structure and temperature-difference power generation module as shown in Figure 1 and Figure 2; Described temperature-difference power generation module is selected the thermoelectric material with different optimum working temperatures, is connected with thermoelectric material hot junction, thermoelectric material and thermoelectric material cold junction in turn; Described phase-change heat transfer structure is comprised of evaporation section and condensation segment; Be filled with the working media of phase-change heat-exchange in the pipeline of evaporation section, and select according to the thermoelectric material optimum working temperature and to reach in this temperature range that caloric receptivity is large to lose little working medium with available energy.Be provided with the space (as shown in Figure 3) of certain size between the pipeline.During work, evaporation section is arranged in the exhaust gas channel, and the tail gas that automobile is discharged is by the space on the evaporation section, and heat is passed to working medium in the pipeline.Have conduit on the condensation segment, temperature-difference power generation module and cooling duct are fixed in the conduit.The surface of condensation segment is close in the hot junction of temperature-difference power generation module (being the thermoelectric material hot junction), and the cold junction of described temperature-difference power generation module is close to the cooling duct wall, passes into cooling water or cooling-air in the cooling duct temperature-difference power generation module cold junction is cooled off.Per two of high temperature, middle temperature or low temperature temperature-difference power generation module are one group with a cooling duct, are provided with two groups between each condensation segment, also can be set to according to actual needs many groups.
Among the present invention, can be divided into hot operation district, middle temperature service area and low-temperature working district Three regions according to temperature and the desired outlet temperature that tail gas enters exhaust gas channel, phase-change material and the temperature-difference thermoelectric material of in each working region, selecting operating temperature range therewith to be consistent.In high temperature section, working temperature is usually about 500 ℃, can select in the semiconductor temperature difference power generating system shown in Figure 1 and receive this moment, the liquid metal such as potassium is as working media, case material is selected corrosion resistant plate, the temperature-difference power generation module that is connected to condensation segment can be selected the contour warm electric material of SiGe; At middle-temperature section, working temperature is about 250～400 ℃, the working media of this moment can be selected the liquid working substances such as naphthalene, and use the housing of the materials such as aluminium, stainless steel or carbon steel, the warm thermoelectric material of using in the temperature-difference power generation module can select the higher warm thermoelectric material of thermoelectrical efficiency in this temperature range such as PbTe; In low-temperature zone, working temperature is limited to below 250 ℃ usually, adopts this moment the cryogenic fluid such as water (after chemical treatment) as working media, and case material is selected copper or the treated carbon steel of inwall, and corresponding low-temperature thermoelectric material can be selected Bi
2Te
3, Sb
2Te
3Deng the low-temperature electricity-generating material.
Main execution mode of the present invention has two kinds: a kind of is to use two kinds of phase-change heat-exchange working medium of high and low temperature as the working media of phase-change heat transfer structure, and choose the operating temperature range high temperature thermo-electric conversion module corresponding with it and low temperature thermo-electric conversion module and form semiconductor temperature difference power generating system, referring to Fig. 4, Fig. 5, cooling system both can adopt water-cooled also can adopt air cooled mode; Another kind is to use high, medium and low three kinds of phase-change heat-exchange working medium as the working media of phase-change heat transfer structure, and choose the operating temperature range high temperature thermo-electric conversion module corresponding with it, in warm electric modular converter and low temperature thermo-electric conversion module form semiconductor temperature difference power generating system, referring to Fig. 1, Fig. 2, cooling system both can adopt water-cooled also can adopt air cooled mode.
Below the present invention is further illustrated by specific embodiment.
Embodiment 1
Referring to Fig. 4, Fig. 5, high temperature automotive tail gas flows into along the import 7 of exhaust gas channel 6, place successively from high to low high-temperature phase-change heat transfer structure and low temperature phase change heat transfer structure in the exhaust gas channel 6, tail gas flows through (referring to Fig. 3) first from the space of the evaporation section 1-1 of high-temperature phase-change heat transfer structure, case material is selected corrosion resistant plate; High temperature refrigerant liquid is liquid metal sodium, absorb tail gas heat quantity and evaporation at high temperature evaporation section 1-1, when steam upwards flows into high temperature condensation segment 2-1 thermal release is given and its contacted high temperature thermoelectric material hot junction 3-1, be condensed into simultaneously liquid, condensed fluid flows back to high temperature evaporation section 1-1 again from the system two ends, form a circulating system, constantly heat is reached high temperature thermoelectric material hot junction 3-1 by high-temperature tail gas; High temperature thermoelectric material 4-1 is SiGe.High-temperature material cold junction 5-1 is close to cooling duct 9, passes into cooling water in the cooling duct, so just forms the temperature difference at high temperature thermoelectric material 4-1 two ends, with generation current, realizes that heat energy is to the conversion of electric energy according to Seebeck effect.After tail gas and high-temperature phase-change heat transfer structure carry out heat exchange, temperature reduces, flow through the again space of low temperature phase change heat transfer structure evaporation section 1-3, carry out heat exchange with the cryogenic fluid liquid (water) in the low temperature phase change heat transfer structure, case material is selected copper or the treated carbon steel of inwall, some heat reaches low-temperature electricity-generating module hot junction 3-3 from tail gas through evaporation section 1-3 and condensation segment 2-3 again, and low-temperature electricity-generating material 4-3 is Bi
2Te
3Low-temperature thermoelectric material cold junction 5-3 is close to cooling duct 9, passes into cooling water in the cooling duct, and formation temperature is poor at low-temperature thermoelectric material 4-3 two ends,, realizes by the conversion of heat energy to electric energy generation current according to Seebeck effect.Tail gas flows out from exhaust gas channel outlet 8 after temperature further reduces.
Embodiment 2
Referring to Fig. 1, Fig. 2, high temperature automotive tail gas flows into along the exhaust gas channel entrance, places successively from high to low high-temperature phase-change heat transfer structure, middle temperature phase-change heat transfer structure and low temperature phase change heat transfer structure in the exhaust gas channel; Tail gas flows through (referring to Fig. 3) first from the space of the evaporation section 1-1 of high-temperature phase-change heat transfer structure, case material is selected corrosion resistant plate; High temperature refrigerant liquid is liquid metal potassium, absorb tail gas heat quantity and evaporation at high temperature evaporation section 1-1, when steam upwards flows into high temperature condensation segment 2-1 thermal release is given and its contacted high temperature thermoelectric material hot junction 3-1, be condensed into simultaneously liquid, condensed fluid flows back to high temperature evaporation section 1-1 again from the system two ends, form a circulating system, constantly heat is reached high temperature thermoelectric material hot junction 3-1 by high-temperature tail gas.High temperature thermoelectric material 4-1 is SiGe.High temperature thermoelectric material cold junction 5-1(is high temperature temperature-difference power generation module cold junction) be close to cooling duct 9, pass into cooling water in the passage, so just form the temperature difference at high temperature thermoelectric material 4-1 two ends, with generation current, realize that heat energy is to the conversion of electric energy according to Seebeck effect.After tail gas and high-temperature phase-change heat transfer structure carry out heat exchange, temperature reduces, flow through the again space of middle temperature phase-change heat transfer structure evaporation section 1-2, after carrying out heat exchange with middle temperature worker quality liquid naphthalene in the middle temperature phase-change heat transfer structure, some heat reaches middle temperature electricity generation module hot junction 3-2 from middle temperature tail gas again, middle temperature electricity generation material 4-2 selects PbTe, warm thermoelectric material cold junction 5-2(namely in warm temperature-difference power generation module cold junction) be close to cooling duct 9, pass into cooling water in the passage, so just form the temperature difference at high temperature thermoelectric material 4-2 two ends, with generation current, realize that heat energy is to the conversion of electric energy according to Seebeck effect.Flow through the space of low temperature phase change heat transfer structure evaporation section 1-3 after the temperature of tail gas further reduces again, carry out heat exchange with cryogenic fluid liquid water in the low temperature phase change heat transfer structure, and heat is reached low-temperature electricity-generating module hot junction 3-3, the low-temperature electricity-generating material is Sb
2Te
3Low-temperature thermoelectric material cold junction 5-3(is low temperature temperature-difference power generation module cold junction) be close to cooling duct 9, pass into cooling water in the passage, formation temperature is poor at low-temperature thermoelectric material 4-3 two ends,, realizes by the conversion of heat energy to electric energy generation current according to Seebeck effect.Tail gas flows out from exhaust gas channel outlet 8 after temperature further reduces.
Claims (6)
1. semiconductor temperature difference power generating system, comprise phase-change heat transfer structure and temperature-difference power generation module, it is characterized in that, described phase-change heat transfer structure forms the high-temperature phase-change heat transfer structure by high temperature evaporation section (1-1), high temperature condensation segment (2-1), warm phase-change heat transfer structure in being formed by middle temperature evaporation section (1-2), middle temperature condensation segment (2-2), form the low temperature phase change heat transfer structure by low-temperature evaporation section (1-3), cryogenic condensation section (2-3), each group phase-change heat transfer structure is the circulatory system of a sealing;
Described temperature-difference power generation module forms the high temperature electricity generation module by high temperature thermoelectric material hot junction (3-1), high temperature thermoelectric material (4-1) and high temperature thermoelectric material cold junction (5-1), warm electricity generation module in being comprised of warm thermoelectric material hot junction (3-2), warm thermoelectric material (4-2), warm thermoelectric material cold junction (5-2) forms the low-temperature electricity-generating module by low-temperature thermoelectric material hot junction (3-3), low-temperature thermoelectric material (4-3), low-temperature thermoelectric material cold junction (5-3);
Described high temperature evaporation section (1-1), middle temperature evaporation section (1-2) and low-temperature evaporation section (1-3) are placed in the exhaust gas channel (6) from high to low successively according to exhaust temperature; High temperature, the middle gentle low temperature temperature-difference power generation module that described high temperature thermoelectric material hot junction (3-1), warm thermoelectric material hot junction (3-2), low-temperature thermoelectric material hot junction (3-3) and high temperature thermoelectric material (4-1), warm thermoelectric material (4-2), low-temperature thermoelectric material (4-3) and thermoelectric material cold junction (5) form is separately positioned between corresponding high temperature condensation segment (2-1), middle temperature condensation segment (2-2) or the cryogenic condensation section (2-3), and the outer setting of thermoelectric material cold junction has cooling duct (9); Described high temperature, per two of middle gentle low temperature temperature-difference power generation module are one group with a cooling duct, are provided with two groups between each condensation segment;
The working temperature of described high-temperature phase-change heat transfer structure and high temperature thermoelectric material is usually at 400～500 ℃, select normal boiling point in this interval and the higher working medium of the latent heat of vaporization, case material is selected corrosion resistant plate, and the high temperature thermoelectric material is selected the high thermoelectric material of figure of merit in this temperature range;
The working temperature of described middle temperature phase-change heat transfer structure and warm thermoelectric material is usually at 250～400 ℃, select normal boiling point in this temperature range and the higher working medium of the latent heat of vaporization, housing adopts aluminium, stainless steel or carbon steel material, and warm thermoelectric material is selected the high thermoelectric material of figure of merit in this temperature range;
The working temperature of described low temperature phase change heat transfer structure and low-temperature thermoelectric material is usually below 250 ℃, adopt normal boiling point in this interval and the higher working medium of the latent heat of vaporization, case material is selected copper or the treated carbon steel of inwall, and low-temperature thermoelectric material is the high thermoelectric material of figure of merit in the interval for this reason.
2. according to claim 1 semiconductor temperature difference power generating system is characterized in that, described phase-change heat transfer structure also can be comprised of two groups of high temperature and low temperature phase change heat transfer structure, and perhaps the phase-change heat transfer structure by many groups relevant temperature forms; Described temperature-difference power generation module and phase-change heat transfer structure adapt, and also can be comprised of two groups of high temperature and low-temperature electricity-generating module, and perhaps the temperature-difference power generation module by many groups relevant temperature forms.
3. according to claim 1 semiconductor temperature difference power generating system is characterized in that, described cooling duct (9) both can adopt water-cooling pattern also can adopt air cooled mode.
4. according to claim 1 semiconductor temperature difference power generating system is characterized in that, described high-temperature phase-change working medium is sodium, potassium, lithium, silver, caesium or rubidium, and the high temperature thermoelectric material is SiGe, CoSb
3, CeFe
3RuSb
12, oxide type thermoelectric material, skutterudite type thermoelectric material or Half-Heusler compound thermoelectric material.
5. according to claim 1 semiconductor temperature difference power generating system is characterized in that, described middle temperature phase-change working substance is naphthalene, biphenyl, Dowtherm-A, Dowtherm-E or mercury, and warm thermoelectric material is PbTe, TAGS or AlPdMn.
6. according to claim 1 semiconductor temperature difference power generating system is characterized in that, described low temperature phase change working medium is hexane, acetone, ethanol, methyl alcohol, toluene or the water after chemical treatment, and low-temperature thermoelectric material is Bi
2Te
3, Sb
2Te
3, metal alloy solid-solution material or BiSbTe.
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| CN105391347A (en) * | 2015-12-18 | 2016-03-09 | 李俊娇 | Automobile waste heat power generation device |
| WO2017166102A1 (en) * | 2016-03-30 | 2017-10-05 | 博立多媒体控股有限公司 | Thermal energy utilization system |
| CN109103325A (en) * | 2018-07-13 | 2018-12-28 | 西北工业大学 | A kind of multistage electrothermal module with phase-change accumulation energy layer |
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Application publication date: 20130501 |