Stirling freezer employs a Stirling engine to achieve cooling through a cyclic process of compressing and expanding a working gas like helium. It operates efficiently and reliably by transferring heat between different components such as displacer and power pistons, heat exchangers, and a regenerator. Stirling freezers are renowned for their precise temperature control, making them ideal for preserving biological samples, pharmaceuticals, and for cryogenic applications. They are environmentally friendly due to their use of inert gases and lack of harmful refrigerants, offering high efficiency and durability in freezing technology.