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A study of correlations between fin-tube joint integrity and the thermal performance of aluminum microchannel heat exchangers.

Number: 2356

Author(s) : WANG Y., ZHAO H.

Summary

The fin-tube braze joint is critical for the high thermal performance of the brazed aluminum microchannel heat exchangers. Corrosion-related braze joint damage, e.g., loss of braze joints and decrease in braze joint fillet size, is expected to cause degradation of the performance of the heat exchanger. This study provides a quantitative evaluation of the correlation between the thermal performance of brazed aluminum microchannel heat exchangers and braze joint integrity. A theoretical model is proposed to estimate the decrease in thermal performance according to the quantity of braze joint loss. The performance loss estimated by the model agrees well with the experimental results obtained from two microchannel heat exchangers (MCHEs) brazed with different quantities of joints (MCHE#1 with 100% joints, MCHE#2 with 21% joints). The difference in the airside thermal resistance of the MCHE#2 between the model and experimental results is less than 9%. A comparison of the performance of the brazed MCHE#1 and MCHE#3 with different fin-tube joint sizes is also experimentally performed. The results show a relatively small impact of the joint size on the thermal performance of the MCHEs studied in this paper.

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  • Original title: A study of correlations between fin-tube joint integrity and the thermal performance of aluminum microchannel heat exchangers.
  • Record ID : 30033167
  • Languages: English
  • Subject: Technology
  • Source: 2024 Purdue Conferences. 20th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2024/07/17

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