page_title: ULT freezer
section_title: Refrigeration cycle
hierarchical_section_title: ULT freezer / Refrigeration cycle
caption_attribution_description: English: This image shows a two-cycle cascade refrigeration process schematic diagram
context_page_description: A ULT freezer is simply a refrigerator whose contents are usually stored at between -40 and -86°C. ULT is the abbreviation for ultra low temperature. There are upright and chest freezers. The inner volume is in general between 300 and 800 L.
context_section_description: ULT freezers that employ the cascade refrigeration (CR) system use up to 20 times the energy footprint of household fridges, and used to refrigerate with greenhouse gas fluids (typically hydrofluorocarbon R-508B).Modern ULT freezers employ HC gas mixtures. Typically Ethane and Propane. This has also improved their efficiency by up 30% over the conventional CFC or HFC gassed freezers.
caption: A two-cycle cascade refrigeration process schematic diagram
exif: {}