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IMMERSION COOLERS & PELTIER APPLIANCES


thermo-electric cooling group

Seebeck-Peltier Thermoelectrics
Solid State Heating & Cooling
Peltier Appliance Innovation


Description

Voltage potential across two dissimilar semi-conductors creates a temperature difference between them caused by electron diffusion, which is properly called the Peltier-Seebeck Effect. Arrays of semi-conducting pairs are typically manufactured as wafer-thick modules in sizes of up to around 60mm square and 6mm deep, that may contain up to 287 junctions.

Performance Perspectives

Coefficient of Performance - CoP - generally varies between 0.3 and 0.7 according to circumstance. This is the ratio of cooling effect against power supplied. Although in contrast, thermodynamic cycles might return CoPs of around 3.0 across corresponding temperature gradients, Peltier technology enables processes that could not otherwise be contemplated. They provide practical cooling solutions for compact high value applications such as avionic and research equipment, descrete devices subject to variable accelerations, and operations requiring precise control of energy flow.

Electrical power may be obtained by heating one side of an array and cooling the other, and some Peltier modules are specifically designed for that purpose. Efficiencies are low, with generation capacity seldom exceeding 4W. They have a finite longevity - usually of up to ten or twelve years. Even where efficiency is not of particular importance, cost factors in heating mode compare unfavourably with other methods of heat-to-power conversion.


Other Applications

Circuit boards and other small, confined spaces are natural environments for Peltier devices. Cost, power consumption, and temperature differentials act as constraints on domestic and personal appliances. Whilst expectations must be tempered with realism where heavy cooling loads meet high ambients, Dove Thermal has produced many successful consumer products on clients' behalf. These include a table-top wine cooler, a chill box with freezer compartment, a cooling jug, and various immersion coolers.

Dove Thermal Engineering Limited, Uttoxeter, ST14 8QX

Telephone: 01889 569933