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Home Georgian Technologies Two-Cascade High-Efficiency Helio-Thermal-Generator

Two-Cascade High-Efficiency Helio-Thermal-Generator


At present whole world focused on obtaining electric energy sources based on pollution-free renewable solar energy. In this regard many actual steps have been made in the field of solar photoelectric generators creation based on single-crystal silicon. They work on natural solar radiation flow (energy density flow ~0,1 W/cm2) with converting efficiency ~10 % and elaborated energy densities power ~0,01 W/cm2. Works on solar thermo-electric generators creation (HTEG) converting heat (generated at absorbing concentrated sunrays) to electricity due to their low working temperatures proved to be less-effective. Maximal working temperature of common HTEGs based on low-temperature thermo-electric alloys Bi2Te3–Sb2Te3 p-type and Bi2Te3–Bi2Se3 n- type does not exceed 300°С. Efficiency and density of electric power elaborated by the mentioned alloys while temperature gradient 300-25°С makes ~9 % and 0,3-0,5 W/cm2 respectively. Efficiency and density of electric power of those generators do not exceed 5 % and 0,2 W/cm2 for the constructional shortages. Lack of thermo-electric batteries which operate stably in the air at temperatures more than 350°С was main restriction for more effective HTEGs.

Considerably high efficiency thermo-electric alloys SiGe/GaP n- and p-type conductivity, which work stably to 1100°С in: vacuum, inert gas and air. Their efficiency of converting while temperature junctions 1100-100°С is ~14 %, and while 1100- 300°С it is 11%. Elaborated electric power within the mentioned regimes has density of 1-2 W/cm2.

Innovative Aspect and Main Advantages

We propose creation of pilot sample two-cascade - HTEG. The first cascade is based on SiGe/GaP n- and p-type, the second is based on Bi2Te3–Sb2Te3 p-type and Bi2Te3–Bi2Se3 n- type. Potential efficiency of HTEG thermo-electric converter at overall temperature juncture 1100-50°С (1100-300°С – the first cascade and 300-50°С – the second cascade) makes ~19 %.

Areas of Application

Sukhumi Ilia Vekua Institute of Physics and Technology (SIPT) is highly experienced in creation of high-temperature thermo-electric generators (TEG) (based on Si-Ge), mediumtemperature (based on PbTe and GeTe) and low-temperature (based on Bi2Te3–Sb2Te3 and Bi2Te3–Bi2Se3) of various applications. They worked in vacuum or inert gas. Pilot sample heat-resisting thermo-electric batteries based on thermoelectric Si-Ge alloys which work in the air till 1100°С were created in the same place. Analogous batteries could be easily produced on the basis of more effective SiGe/GaP alloys. Creation of those batteries and two mirrors is subject of the cost of electric energy generated by high-temperature twocascade HTEG according to proposed price occurs 30-40% less compared to electric energy costs generated by silicon photoelectric generator.

Fig. 1 Two-cascade HTEG.
The figure shows principle circuits of high-temperature two-cascade
HTEG and the fragment of its thermo-electric converter containing
I and II cascades of the thermo-electric batteries (TEB).
Their core clusters as follows:
1. Paraboloidal mirror;
2. Hyperbolic mirror;
3. Thermo-electric converter;
4. I cascade TEB;
5. II-cascade TEB;
6. Ceramic heater fragment absorbing concentrated sunrays;
7. Fragment of water cooler.

Stage of Development

  • High-temperature heat-resisting commutation transition to thermo-electric alloys SiGe/GaP n- and p-type conductivity has been developed;
  • “Kassergen” type two-mirror optical furnace with reception area of a sunlight ∼3m2 has been created;
  • High-temperature two-cascade thermo-electric converter has been created;
  • Pilot sample of high temperature two-cascade heliothermal- electric-generator with output electric power ~300 Вт. has been set-up and tested.

Contact Details

Yuri Nardaya
Organization: Sukhumi Institute of Physics and Technology (SIPT)
Address: 15 Kazbegi Avenue 0160 Tbilisi, Georgia
(+995 32) 33 5520
This e-mail address is being protected from spambots. You need JavaScript enabled to view it

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