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2023 ASHRAE Annual Conference

This product is a .zip file that contains files that consist of PowerPoint slides synchronized with the audio recording of the speaker, PDF files of the slides, and audio only (.mp3 format) as noted.

The phasing out of conventional HFC refrigerants due to their environmental impact has prompted the evaluation of alternative low-GWP refrigerants' thermal performances. This seminar highlights the in-tube heat transfer of low-GWP HFOs, HFCs, and their mixtures in internally enhanced microfin tubes, ranging from 2.11 mm to 11.98 mm ID. A new correlation, developed using neural network and applicable to 16 refrigerants, with lower error than existing correlations, is introduced. The seminar also compares the experimental performance of R-32 and R-410A in microfin and smooth tubes to demonstrate the effectiveness of the enhanced solution and clarify simple design guidelines.