Design and analysis of a portable free piston strnrng deep freezer

A numerical study is conducted to study the feasibility of a free piston for a deep freezer using Sage software in which the free piston is modelled and optimized. The increased environmental hazards and energy consumption has led to the need for an alternative refrigeration technology. Hence the Stirling refrigeration using free piston which can even operate at the cryogenic temperatures, is a promising alternative. Since the design is concentrated on a cooler which can operate upto 193K a 14 L deep freezer is designed. A free piston using Helium as working fluid is designed and studied using the Sage software. Based on the operating conditions the energy flow in the free piston is obtained and dimensions for the freezer are determined. The heat from the refrigeration space is absorbed using a CO₂capsule which acts as a thermos-syphon. These CO₂ capsules are kept in contact with the cold side of the free piston. The deep freezer is then tested for its efficiency and cooling capacity.