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Accelerating-particle-deposition method for quickly evaluating long-term performance of fin-and-tube heat exchangers.

Number: pap. 2277

Author(s) : ZHUANG D., DING G., YANG Y., et al.

Summary

Fin-and-tube heat exchanger is the most commonly used heat exchanger type in air-conditioning systems. In the actual operation of air-conditioning systems, the dust particles involved in the air may partly deposit and form particulate fouling on fins and tubes when the dusty air flows through the heat exchangers. The deposited particles may gradually block the passageway of air flow and occupy the heat transfer area, which results in the continuous increase of air side thermal resistance and the significant deterioration of the heat transfer capacity of heat exchangers during the longterm operation. In order to quickly evaluate the long-term performance of fin-and-tube heat exchangers, an accelerating-particle-deposition method, which is capable of implementing the particle deposition process on the longrunning heat exchangers in a short time, is proposed in this study.

The idea of the accelerating-particle-deposition method is to employ high concentration dusty air flow through heat exchangers in the accelerated test, and to quickly form the particulate fouling with the same weight as that on longrunning heat exchangers under the actual operating environment with low particle concentration. The accelerating factor, which is defined as the ratio of the actual running time to the accelerated testing time, is calculated based on the deposition weight of dust particles. The deposition weight is calculated by the relationship of the impact frequency and deposition probability of dust particles with the dust feed rate of dusty air.

An experimental apparatus for accelerating the particle deposition process and testing the heat transfer capacity of finand-tube heat exchangers is designed. The accelerating factor is fitted by the experimental data, and the mean deviation of the accelerating factor is 16.3%.

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Pages: 9

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Details

  • Original title: Accelerating-particle-deposition method for quickly evaluating long-term performance of fin-and-tube heat exchangers.
  • Record ID : 30024478
  • Languages: English
  • Source: 2018 Purdue Conferences. 17th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2018/07/09

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