Power generating modules
The required power generating modules types are selected from the General Specification.
Manufactured from high-efficiency material Bi2Te3 using high-temperature solders, these thermoelectric modules are a perfect tool for conversion of heat to electricity.
A great number of investigations are currently underway that are aimed at designing energy saving programs and developing alternative power sources.
Actively involved in such projects, Ferrotec Nord develops, manufactures and offers its customers a series of thermoelectric generating modules for conversion of heat to DC electricity.
Over a few years we have delivered to our customers thermoelectric generator modules for use in various equipment such as fans, light sources, mobile mosquito trap generators, self-contained power supplies, battery chargers, pipeline cathode protection equipment, hot water flow meters, geothermal heat converters and devices using power from centralized heating systems.
Our company may offer you a number of brand new opportunities for dealing with urgent energy saving problems. Depending on the proposed use and operating temperatures, a variety of generator thermoelectric materials are applied in generator modules. Most commonly used are thermoelectric materials designed for application in low temperature (up to 250 °C), medium temperature (250 °C to 500 °C) and high temperature (higher than 500 °C) ranges.
Temperature ranges for various thermoelectric materials
Ferrotec NORD offers its customers Bi2Te3 based high-efficiency Peltier modules of the low temperature range. Thermoelectric modules may be applied within long time at heat source temperatures of up to 180 °C.
At the Customer’s request, thermoelectric module surface may be covered with a heat-conductive foamed carbon thermal pad to ensure reduced heat resistance of the module contact with a heat source, increased heat flow and more efficient conversion of heat to electricity.
Ferrotec NORD generator Peltier modules have the marking TMG-AAA-BB-CC, where:
TMG — thermoelectric generator module
AAA — number of thermocouples
BB — thermoelectric dice cross section, mm
CC — thermoelectric dice height, mm
For example, thermoelectric module marking TMG-127-1.4-1.6 means: generator module type with 127 thermocouples with dices cross section of 1.4 mm and height of 1.6 mm.
Generating module design example
Module operating properties are given at hot side temperature 175 °C and cold side temperature 50°C.* — Module type is without top (hot) side ceramic substrate (half sceleton design).
Uoc – open circuit voltage, (V)
Rin – module internal resistance at 110 °C, (Ohm)
Rload – matched load resistance, (Ohm)
Uload – output voltage, corresponded to matched load, (V)
Λm – module thermal conductance at 110 °C, (W/°C)
The maximum efficiency of conversion of heat to electricity is 3-4% for all thermoelectric modules based on Bi2Te3 materials. Efficiency was determined as a Wload/Q ratio, where Wload — load capacity, Q — heat flow through Peltier module.
When choosing a module, remember that the actual maximum DC capacity generated by the module is given at the optimum load resistance equal to the module resistance Rload = Rin and the module average operating temperature being 110 °C.
Effective electric load capacity at load mismatch (Rload ≠ Rin), may be defined with the following formula:
Wload = U2ocRload/( Rin+ Rload)2
|THERMOELECTRIC MODULE TYPE||BASIC CARACTERISTICS||DIMENSIONS, mm|