Cooling Using The Peltier Effect

Cooling Using the Peltier Effect Peltier elements utilize the thermoelectric effect of some semiconductors. The thermoelectric effect is the reverse of the known thermopower effect which is used when measuring temperatures using thermocouples. If current flows through a Peltier element, one end of the semiconductor becomes hot and the other cold. By a suitable connection of p- and n-doped semiconductor materials the refrigeration capacity can be increased sufficiently to be usable. The benefits of cold production using Peltier elements are: Peltier elements are wear and maintenance-free, noiseless, independent of position and easy to adjust in their refrigeration capacity via the supply voltage. In addition, no refrigerants are required. Peltier elements are used for small capacities in thermography as beverage chillers or in medical engineering. Their low efficiency is a disadvantage. Functional model of a Peltier refrigeration system Experimental unit with clear design of all components at the front Water-cooled Peltier element Shared water circuit for heating and cooling with tank, pump and flow meters Electrical power freely adjustable via potentiometer Digital displays for temperature, current and voltage Flow meter measurement of the water flows via rotameters Technical data: Peltier element Refrigeration capacity: 191,4w Current: 22,6a Voltage: 16,9v Temperature difference: 77,8k Hot side temperature: 50°c Pump Power consumption: 120w Flow rate: 1000l/h Head: 30m Water tank Content: 7l Measuring ranges Current: 0…20a Voltage: 0…200v Temperature: 2x -30…80°c, 4x 0…100°c Flow rate: 2…27l/h, 15…105l/h 230V, 50Hz, 1 phase

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