Abstract

For low-temperature refrigeration applications down to -70 ◦C such as frozen tuna storage, freeze-dry foods,and semiconductor production processes, HFC refrigerant R23 is widely used. It is also used for testing equipment for the evaluation of electronics and automobiles. Some COVID-19 vaccines require such low-temperature storage. R23, however, has an extremely large global warming potential (GWP100=12,690). To comply with the Kigali Amendment, it will be very important to develop a low GWP alternative in that technical field. This work presents intensive evaluation results of screening refrigerant candidates to substitute R23. More than 20 refrigerant candidates were filtered by comparing their theoretical cycle COP and volu[1]metric capacity with a ”Pareto front” of the performance. R23, CO2 and thus filtered substances, R1132a,R41, and N2O, have some drawbacks such as high GWP, flammability, toxicity, or freezing issues. In thiswork, therefore, possible binary pairs including these 5 substances were investigated.