Peltierelement

A Peltierelement, also known as a Peltier element, is a solid-state heat pump that uses the Peltier effect to move heat when electric current flows through a circuit of thermoelectric materials. In such a device, heat is absorbed at one junction and released at the opposite junction, with the direction of heat transfer determined by the current.

Typically, a Peltierelement consists of many n-type and p-type thermoelectric couples connected in series and thermally in parallel, and assembled between ceramic plates with metal contacts. The semiconductors are usually based on bismuth telluride near room temperature. The module has a hot side and a cold side; proper heat sinking of the hot side is essential for effective operation.

Performance depends on current, temperature difference, and geometry, and is quantified by metrics such as the coefficient of performance and the maximum achievable temperature difference (ΔT). The figure of merit of the thermoelectric materials, often denoted ZT, governs efficiency. Peltierelements offer advantages like no moving parts, silent operation, compactness, and fast response, but their efficiency is typically lower than that of conventional vapor-compression systems, and significant heat must be dumped from the hot side.

Applications include cooling of electronic components, laser diodes, infrared sensors, and scientific instruments, as well as portable coolers and temperature stabilization in various devices. They are valued for precise temperature control, rapid response, and absence of refrigerants, though limited cooling capacity and higher cost can constrain their use to moderate cooling tasks.