Hampson–Linde cycle

The Hampson–Linde cycle is based on the Joule-Thomson effect and is used in the liquefaction of gases, especially for air separation. William Hampson and Carl von Linde independently filed for patent of the cycle in 1895.

Similar to the Siemens cycle, this technique utilizes the temperature changes induced by compression and decompression of a gas. Where the Siemens cycle has the gas do external work to reduce its temperature, the Hampson-Linde cycle relies solely on work done against its own intermolecular forces. This is less efficient (any external work done would be an improvement) and particularly so at higher temperatures but has the advantage that the cold side needs no moving parts.