Sustainable Refrigeration Technologies and Alternatives
Summary
The global cooling sector is at a crossroads, driven by the twin imperatives of mitigating greenhouse-gas emissions and meeting growing demand for food preservation, air conditioning and industrial processes. Traditional vapour compression systems, long reliant on high-GWP hydrofluorocarbons, are being supplanted by low-GWP hydrofluoroolefins, natural refrigerants and advanced cycle architectures. Parallel efforts target system-level efficiency gains through internal heat exchangers, ejector-assisted expansion and intelligent control strategies. Equally, non-vapour-compression approaches—magnetocaloric, thermoacoustic and adsorption-desorption cycles—are emerging as niche alternatives, offering zero-emission operation albeit at early stages of commercial maturity. Transcritical carbon-dioxide cascade systems and ammonia-based chillers are expanding in cold-chain applications, while hydrocarbon blends exploit favourable thermophysical properties for small-scale refrigeration. Taken together, these developments promise a portfolio of cooling solutions that balance performance, safety and life-cycle climate impact, with global significance for energy security, food supply chains and urban comfort.
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Sustainable Refrigeration Technologies and Alternatives publication trend
The graph below shows the total number of articles in sustainable refrigeration technologies and alternatives across all publications each year (not limited to Nature Index journals).
Technical terms
Global Warming Potential (GWP): A metric expressing the heat-trapping effect of a refrigerant relative to carbon dioxide over a specified time span.
Vapour Compression Cycle: A refrigeration process that utilises the phase change of a working fluid to absorb heat from a low-temperature source and reject it to a higher-temperature sink.
Hydrofluoroolefin (HFO): A class of unsaturated fluorinated hydrocarbons designed to exhibit low global warming potential and zero ozone-depletion potential.
Natural Refrigerants: Substances such as ammonia, carbon dioxide and hydrocarbons that occur in nature and are valued for minimal environmental impact.
Coefficient of Performance (COP): The ratio of useful refrigeration or heating effect produced by a system to the work input required, indicating energy efficiency.
References
- Comprehensive experimental evaluation of R1234yf-based low GWP working fluids for refrigeration and heat pumps. Energy Conversion and Management (2022).
- Experimental comparison of HFO-1234ze(E) and R-515B to replace HFC-134a in heat pump water heaters and moderately high temperature heat pumps. Applied Thermal Engineering (2021).
- Vapor Compression Cycle: A State-of-the-Art Review on Cycle Improvements, Water and Other Natural Refrigerants. Clean Technologies (2023).
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